Freaky-Deaky!
PLL02A
PLL02A Modification #1
1. Locate Pin 11 and Isolate it by cutting the foil which connects into the channel selector. Install a 3.3K 1/4 watt resistor across this cut.

2. Using a SPST mini toggle switch connect wires from the switch as shown in the above diagram. This will yield low channels starting at 26.805 and ending at 26.905 with some skips in between.  This modification picks up some channels skipped by Modification #4.

Mod #1 Channel Chart
1=26.805
2=26.815
3=26.825
4=26.845
5=26.855
6=26.865
7=26.875
8=26.895
9=26.905
PLL02A Freq Mod #2
1. Locate Pin 10 and Isolate it by cutting the foil which connects it to the channel selector. Install Rl, a 3.3K 1/4 watt resistor, across this cut.

2. Using a SPST mini toggle switch connect wires from the switch as shown in the above diagram. This will yield low channels starting at 26.435 and ending at 26.745 with some skips in between.  If all of the channels are not there, some adjustment of VCO may be required.

Mod #2 Channel Chart
1=26.645
2=26.655
3=26.665
4=26.685
5=26.695
6=26.705
7=26.715
8=26.735
9=26.745
10=26.435
11=26.445
12=26.465
13=26.475
14=26.485
15=26.495
16=26.515
17=26.525
18=26.535
19=26.545
20=26.565
21=26.575
22=26.585
23=26.615
29=26.595
25=26.605
26=26.625
27=26.635
28=26.645
29=26.655
30=26.665
31=26.675
32=26.685
33=26.695
34=26.705
35=26.717
36=26.725
37=26.735
38=26.745
39=27.395
40=27.405
PLL02A Freq Mod #3
1. Locate Pin 10 and Isolate it by cutting the foil which connects it to the channel selector. Install a 3.3K, 1/4-watt resistor across this cut.

2. Using a SPST mini toggle switch connect wires from the switch as shown in the above diagram. This will yield high channels starting at 27.395 and ending at 27.705 with some skips in between.
Mod #3 Channel Chart
10=27.395
11=27.405
12=27.425
13=27.435
14=27.445
15=27.455
16=27.475
17=27.485
18=27.495
19=27.505
20=27.525
21=27.535
22=27.545
23=27.575
24=27.555
25=27.565
26=27.585
27=27.595
28=27.605
29=27.615
30=27.625
31=27.635
32=27.645
33=27.655
34=27.665
35=27.675
36=27.685
37=27.695
38=27.705
39=27.395
40=27.405
 
PLL02A Freq Mod #4
1. Locate and isolate pin 9 and pin 10 as shown in fig 02a-4. Be sure to isolate each one completely. Then solder a 3.3k resistor across each cut as shown.

2. Mount a DPDT/Center off toggle in a convenient location. Then using a piece of 5 wire ribbon, make the connections as shown. Be sure to check for any solder bridges before you proceed.

3. Now if all connections are right you will have normal channels in the center position, and the following channels in the other two.

Switch in the "up" position:
10=26.435
11=26.445
12=26.465
13=26.475
14=26.485
15=26.495
16=26.515
 
17=26.525
18=26.535
19=26.545
20=26.565
21=26.575
22=26.585
23=26.615
 
24=26.595
25=26.605
26=26.625
27=26.635
28=26.645
29=26.655
30=26.665
 
31=26.675
32=26.685
33=26.695
34=26.705
35=26.715
36=26.725
37=26.735
38=26.745
Switch in the "down" position:
10=26.755
11=26.765
12=26.785
13=26.795
14=26.805
15=26.816
16=26.835
17=26.845
18=26.855
19=26.865
20=26.885
21=26.895
22=26.905
23=26.935
24=26.915
25=26.925
26=26.945
27=26.955
28=26.965(Ch1)
29=26.975(Ch2)
30=26.985(Ch3)
31=26.995(3A)
32=27.005(4)
33=27.015(5)
34=27.025(6)
36=27.035(7)
37=27.045(7A)
38=27.055(8)


PLL02A or MC145109
Frequency modification for DAK Mark X, etc.

MC124109 -- or -- PLL02A

1. Locate on the bottom side of the circuit board, Pin 9, Pin 10, and Pin 11 of the main PLL chip (IC1). On some units this will be an 02A chip and others will have the MC145109 chip. However they are both identical and have the same functions. Now totally isolate each of these pins with a small cut. Pin 9 is connected to a larger land and will require special care in order to totally isolate it.

2. Next solder a 3.3K 1/4 watt resistor across each one of these cuts as shown in the diagram above. Next twist together the wire from the cathode end (banded end) of 2 small signal diodes (1N914 or equivalent). Using some cutters cut the other 2 ends (anode end)* to about 1/2" in length. Solder one of the anode ends to pin 11 and the other to pin 10. * Note that leads of the signal diodes in the above illustration are shown as being long. This is for illustration purposes only. In reality you should keep all leads as short as possible. This not only looks better and helps to prevent any problems from short circuits as well as making a stronger connection.

3. Next mount 2 Single Pole Single Throw toggle switches in a convenient location, normally on the front radio panel. Now tie the two bottom poles of the two switches together by soldering a piece of hook-up wire across them. Use a long enough piece of wire for this so that after you tie these two poles together you have enough to solder the other end to the circuit board ground.

4. Now Solder a piece of hook-up wire from the middle pole of the first switch (SW-1) to the cathode ends (banded ends) of the diodes. Next solder a piece of hook-up wire from center pole of the second switch (SW-1) to pin 9.     

5. Next re-check all your connections to make be sure that you donít have any shorts or solder bridges.

6.  Now turn the unit on and check for normal operation. With both switches in the down position you should have the normal 40 channels. Now put the unit on channel 30 AM With the SW-1 switch down and SW-2 switch up, key the radio and check for 27.945. If it's not there you will need to carefully adjust the VCO slightly in order to get it to pop in. The VCO is the adjustment located in the oblong metal can just to the upper right of the main PLL chip. 

7. Once that you have 27.945, check for power output on channel 1 (leave switches in the same position) compared to the power output on 27.945. Usually it will be lower on the upper channels. In order to correct this you will need to balance the power by adjusting T4' while on 27.945. Adjust T4 in USB transmit mode while injecting a constant tone into the mike. Adjust T4 until the power output is equal or fairly close to the output on channel 1. 

Note that T4 is located just to the right of the large 10.7 MHz filter. T5 is right next to T4.T5 controls the balance of the power level on the lower channels in comparison to Channel 40.


Position #1 = SW-1 DOWN and SW-2 DOWN = Normal Channels

Position #2 = SW-1 UP and SW-3 DOWN =

1=27.445
2=27.455
3=27.46
4=27.487

5=27.495
6=27.505
7=27.515
8=27.535

9=27.545
10=27.555
11=27.565
12=27.585

13=27.595


Position #3 =SW-1 Down-and SW-2 UP =

1=27.605
2=27.615
3=27.625
4=27.645
5=27.655
6=27.665
7=27.675
8=27.695
9=27.705
10=27.715

11=27.725
12=27.745
13=27.755
14=27.765
15=27.775
16=27.795
17=27.805
18=27.815
19=27.825
20=27.845

21=27.855
22=27.865
23=27.895
24=27.875
25=27.885
26=27.905
27=27.915
28=27.925
29=27.935
30=27.945

31=27.955
32=27.965
33=27.975
34=27.985
35=27.995
36=28.005
37=28.015
38=28.025
39=28.035
40=28.045

uPD858c PLL

uPD858c AM Only Mod #1:

uPD858 AM Chassis Mod #1 

1. Locate pin 19 of the 858 PLL chip on the foil side of the circuit board. Isolate this pin by making a small cut as shown in the above illustration. Install a 4.7K 1/4 watt resistor across this cut as shown.

2. Mount a SINGLE POLE/DOUBLE THROW/CENTER OFF mini toggle switch in a convenient location. Use 3-wire ribbon cable and solder both ends as shown in the above diagram.

3. With the switch in the Center Position you will now have Normal Channels. With the switch in the Down Position you will have the Low Channels. With the switch in the Up Position you will have the High Channels.

Lo Channel Position:

27=26.875
28=26.885
29=26.895
30=26.905
31=26.915
32=26.925
33=26.935
34=26.945
35=26.955
36=26.965
37=26.975
38=26.985

Hi Channel Position:

1=26.875
2=27.375
3=27.385
4=27.405
5=27.415
6=27.425
7=27.435
8=27.455
9=27.465
10=27.475
11=27.485
12=27.505
13=27.515
14=27.525
15=27.535
16=27.555
17=27.565
18=27.575
19=27.585
20=27.605
21=27.615
22=27.625
23=27.655
24=27.635
25=27.645
26=27.665

 

uPD858c AM Only Mod #2:

uPD858c AM Freq Mod #2 

1. Locate Pin 20 of the PLL Chip on the foil side of the circuit board. Carefully make a small cut on both sides of the pin in order to isolate this pin completely from the circuit board ground path. On some models such as the TEABERRY "T" DISPATCH it is necessary to install a jumper across these cuts in order to reconnect the ground back together. Next install a 4.7K 1/4 Watt Resistor from Pin 20 back to ground.

2. Mount a Single Pole/Single Throw switch in a convenient location. Connect 2 pieces of hook-up wire to the switch as shown. Connect the wire from the center lead of the switch to pin 20. The other wire from the switch connects to the 5 Volt supply Voltage. Now with the switch in the up position you will have the following high channels. If the channels are not there you may have to tweak the VCO coil adjustment as well as the transmit balance adjustment in order to pop them in.

Channel Chart with switch "on":

27=27.675
28=27.685
29=27.695
30=27.705
31=27.715
32=27.725
33=27.735
34=27.745
35=27.755
36=27.765
37=27.775
38=27.785
39=27.795
40=27.805

 

uPD858c SSB MOD #3:

uPD858c Freq Mod SSB #3

1. Locate pin 19 of the 858 PLL. It will be is connected to ground by a very small land. Using a small x-acto knife, make a small cut between pin 19 and ground. Be sure to totally isolate pin 19 from ground. Next solder a 4.7k resistor across this cut, from pin 19 back to ground.

2. Locate pin 21 of the 858 PLL. Carefully make a small cut and isolate just this pin. Then solder a 4.7K resistor from this pin to ground too.

3. Mount a SPDT/Center Off switch and .a SPST toggle switch in a convenient location. Using a piece of 3 wire ribbon cable solder each of the 3 wires to the SPDT switch as shown above. Then solder the corresponding ends to the PLL chip. Be sure to check for any solder bridges and that you have correctly attached each of the wires. Then connect 2 wires from the SPST switch back to the PLL as shown. Again be sure to check for any solder bridges and to thoroughly check each connection before turning the radio on.

4. Now turn the radio on and check to see if all of the channels are there. If not a slight adjustment to the VCO may be necessary in order to get them all to pop in. Once you are sure that all the channels are there you will need to check the power output on channel 26.505 and the power output on channel 99. Normally the power output will be much lower on channel 99. In order to correct this you will need to wide-band the radio. After wide-banding, performing this procedure you should be able to adjust the transmit balance adjustment and obtain fairly close power output on all channels.

Rotary Position #1 or

Switch positions are SW-1 UP & SW-2 CENTER = Normal Channels


Rotary Position #2 or Switch positions are SW-1 UP & SW-2 UP:

8=27.455  (45)
9=27.465  (46)
10=27.475 (47)
11=27.485 (48)
12=27.505 (50)
13=27.515 (51)
14=27.525 (52)
15=27.535 (53)
 
16=27.555 (55)
17=27.565 (56)
18=27.575 (57)
19=27.585 (58)
20=27.605 (60)
21=27.615 (61)
22=27.625 (63)
23=27.655 (65)
 
24=27.635 (63)
25=27.645 (64)
26=27.665 (66)
27=27.675 (67)
28=27.685 (68)
29=27.695 (69)
30=27.705 (70)
31=27.715 (71)
 
32=27.725 (72)
33=27.735 (73)
34=27.745 (74)
35=27.755 (75)
36=27.765 (76)
37=27.775 (77)
38=27.785 (78)
39=27.795 (79)
 

Rotary Position #3 or Switch positions are SW-1 UP & SW-2 DOWN:

8=27.855  (85)
9=27.865  (86)
10=27.875 (87)
 
11=27.885 (88)
12=27.905 (90)
13=27.915 (91)
 
14=27.925 (92)
15=27.935 (93)
16=27.955 (95)
 
17=27.965 (96)
18=27.975 (97)
19=27.985 (98)
20=28.005 (Ham)

Rotary Position #4 or Switch positions are SW-1 DOWN & SW-2 UP:

8=26.455
9=26.465
10=26.475
11=26.485
12=26.505
13=26.515
14=26.525
15=26.535
 
16=26.555
17=26.565
18=26.575
19=26.585
20=26.605
21=26.615
22=26.625
23=26.655
 
24=26.635
25=26.645
26=26.665
27=26.675
28=26.685
29=26.695
30=26.705
31=26.715
 
32=26.725
33=26.735
34=26.745
35=26.755
36=26.765
37=26.775
38=26.785
39=26.795
40=26.805

Rotary Position #5 or Switch positions are SW-1 DOWN & SW-2 DOWN:

8=26.855
9=26.865
10=26.875
 
11=26.885
12=26.905
13=26.915
 
14=26.925
15=26.935
16=26.955
 
17=26.965 (CH 1l)
18=26.975
19=26.985
20=27.005

Rotary Position #6 or Switch positions are SW-1 DOWN & SW-2 CENTER:

11=26.085
12=26.105
13=26.115
14=26.125
15=26.135
16=26.155
17=26.165
18=26.175
19=26.185
20=26.205
21=26.215
22=26.225
23=26.255
24=26.235
25=26.245
26=26.265
27=26.275
28=26.285
29=26.295
30=26.305
31=26.315
32=26.325
33=26.335
34=26.345
35=26.355
36=26.365
37=26.375
38=26.385
39=26.395
40=26.405

 

uPD858c SSB MOD #4

upd858c SSB SSB Mod #4 Rotary 

The conversion shown above is identical to the one shown earlier. However instead of using toggle switches, a rotary switch is shown. Use of a rotary switch gives a more professional touch and is easier to operate than toggle switches.

Follow the wiring diagram of the rotary switch closely. P1 is Pole 1, P2 is Pole 2. Make sure to jumper these together as shown above. Use the same channel chart, just above. Positions on the chart coincide with the rotary switch positions.

uPD858c SSB MOD #5

upd858c SSB Freq Mod #5 

1. This conversion works in conjunction with SSB conversion "#3" or "#4". You must do either the 858 SSB conversion #3 or #4 before this will work.

2. After performing the #3 or #4 858 SSB conversion, mount a SPST toggle switch in a convenient location. Connect the wires from the switch as shown. The cut shown above should have already been made in the previous modifications.

3. Now check for the following channels:

Pos.#1 + SW-3 Up
31=27.415
32=27.425
33=27.435
34=27.445
Pos.#2 + SW-3 Up
31=27.815
32=27.825
33=27.835
34=27.845
Pos.#4 + SW-3 Up
31=26.815
32=26.825
33=26.835
34=26.845
Pos.#5 + SW-3 Up
31=26.415
32=26.425
33=26.435
34=26.445

MB8719 PLL

MB8719 SSB Mod #1:
Dual-Conversion SSB Chassis:
Cobra 148GTL, Cobra 2000, Uniden Grant, Uniden Madison

MB8719 SSB Mod #1 

1. Mount 2 SPST Toggle switches in a convenient location. Be sure to wire the switches up as shown,and to solder each wire carefully.

2. Now with both switches in the down position you will still have the normal channels. Refer to the 8719 Channel chart for the switch positions and their associated channels.

POSITION #1 SW-1 DOWN and SW-2 DOWN = Normal Channels

POSITION #2 SW-1 UP and SW-2 DOWN =

15=26.815
16=26.835
17=26.845
18=26.855
19=26.865
20=26.885
21=26.895
22=26.905
23=26.935
24=26.915
25=26.925
26=26.945
27=26.955
28=26.965(Chl)
29=26.975(Ch2)
30=26.985(Ch3)
31=26.995(3A)
32=27.005(Ch4)

 

POSITION #3 SW-1 UP and SW-2 UP =

1=27.605
2=27.455
3=27.465
4=27.485
5=27.495
6=27.505
7=27.515
8=27.535
9=27.545
 
10=27.555
11=27.565
13=27.595

 
14=27.605
16=27.475
23=27.575

 

POSITION #4 SW-1 Down and SW-2 UP =

1=27.605
2=27.615
3=27.625
4=27.645
5=27.655
6=27.665
7=27.675
8=27.695
9=27.705
10=27.715
11=27.725
12=27.745
13=27.755
14=27.765
15=27.775
16=27.795
17=27.805
18=27.815
19=27.825
20=27.845
21=27.855
22=27.865
23=27.895
24=27.875
25=27.885
26=27.905
27=27.915
28=27.925
29=27.935
30=27.945
31=27.955
32=27.965
33=27.975
34=27.985
35=27.995
36=28.005
37=28.015
38=28.025
39=28.035
40=28.045

MB8719 SSB Mod #2:

Single-Conversion SSB Chassis:
UNIDEN Washington, President McKinley, President P400
COBRA 140GTL, 142GTL

MB8719 Freq Mod SSB #2 

1. Mount 2 SPST Toggle switches in a convenient location. Be sure to wire the switches up as shown,and to solder each wire carefully.

2. Now with both switches in the down position you will still have the normal channels. Refer to the 8719 Channel chart for the switch positions and their associat1. Locate and unsolder the 11.1125 crystal and replace with a new 11.3258 crystal. Locate pin 10 of the MB8719 PLL chip. Notice that it is connected to ground. Make a small cut and totally isolate this pin from ground. Before proceeding turn the radio on and check to make sure that you have all of the normal channels and that the frequencies are correct. If necessary adjust CT3 for USB first, then L20 for LSB, and L 19 for AM.

2. Next mount your switches and wire them up as shown above. Be sure to check all of your connections before proceeding. Refer to the 8719 Channel Chart for your new frequencies. Note : Some of the older MB8719 Chips have the dot marking on pin 18. The newer MB8719 chips have the dot marking on pin 1. Regardless pin 1 is always the first pin to the left of the indentation marking on one end.

MB8719 SSB Mod #3:
MB8719 single-conversion SSB chassis; Rotary Switch
UNIDEN Washington, President McKinley, President P400
COBRA 140GTL, 142GTL

8719 Single-Conversion SSB Chassis; Rotary Switch

1. Obtain a double-pole / 6 position rotary switch. Refer to the above diagram. Note that pin 3 and pin 5 are tied together. Pins 1 and 4 are tied together. Pins 3A and 4A are tied together, and that pins 1A, 2A and 5A are also tied together. You will need to solder small jumpers across the pins as shown. Next obtain a piece of 6 wire ribbon wire and wire to the switch as shown in the above diagram. Be sure to use a long enough piece of wire to reach from the switch to the PLL once the switch is installed in its permanent location. Note which color of wire goes to the switch pins in order to make it easier when connecting the other end to the PLL chip.

2.  Next using an X-Acto carefully cut and isolate Pin 10 and Pin 12 of the MB8119 PLL chip. Be sure to isolate just these PLL pins. Once this has been done connect the wire from the switch to the correct locations as shown in the above diagram, and mount the switch. Refer to the channels on the next page and check each position of the switch for these channels. You will probably find that some do not match. If this is the case you will need to carefully adjust L18 (Tripler Can) until all channels are there there. This is a very critical adjustment in order for this modification to work without changing the 11.1125 xtal. Usually just a small amount is needed.

POSITION #1 = Normal Channels

POSITION #2 =

23=27.415 26=27.425 27=27.435 28=27.445

POSITION #3=

1=27.605
2=27.455
3=27.465
4=27.485
5=27.495
6=27.505
7=27.515
8=27.535
9=27.545
10=27.555
11=27.565
12=27.585
13=27.595
14=27.605
14=27.605
15=27.935
16=27.955
17=27.965
18=27.975
19=27.985
20=28.005
21=28.015
22=28.025
23=28.055
24=28.035
25=28.045
26=28.065
27=28.075
28=28.085

POSITION #4 =

1=27.605
2=27.615
3=27.625
4=27.645
5=27.655
6=27.665
7=27.675
8=27.695
9=27.705
10=27.715
11=27.725
12=27.745
13=27.755
14=27.765
15=27.775
16=27.795
17=27.805
18=27.815
19=27.825
20=27.845
21=27.855
22=27.865
23=27.895
24=27.875
25=27.885
26=27.905
27=27.915
28=27.925
29=27.935
30=27.945
31=27.955
32=27.965
33=27.975
34=27.985
35=27.995
36=28.005
37=28.015
38=28.025
39=28.035
40=28.045

POSITION #5=

2=26.815
3=26.835
4=26.845
5=26.855
6=26.865
7=26.875
8=26.895
9=26.905
10=26.915
11=26.925
12=26.945
13=26.955
14=26.965(Chl)

POSITION #6=

1=26.485
2=26.335
3=26.345
4=26.365
5=26.375
6=26.385
7=26.395
8=26.415
9=26.425
10=26.435
11=26.445
12=26.465
13=26.475
14=26.485
15=26.655
16=26.675
17=26.685
18=26.695
19=26.705
20=26.725
21=26.735
22=26.745
23=26.775
24=26.755
25=26.765
26=26.785
27=26.795
28=26.805
29=26.655
30=26.665
31=26.675
32=26.685
33=26.695
34=26.705
35=26.715
36=26.725
37=26.735
38=26.745
39=26.755
40=26.765

MB8719 SSB Mod #4:
MB8719 Export Chassis
:
Grant Export and work-alikes.

MB8719 SSB Freq Mod for EXPORT Chassis #3 

1. Install a SPDT/Center Off toggle switch in a convenient location. Locate Pin 11 of the MB8719 PLL Chip. Take note that the dot on the top side of this chip is on Pin 18, not Pin 1 as usual. Working from the foil side of the board, make a small cut on the land that connects pin 11 to the circuit board. Make sure that you totally isolate just this pin.

2. Install a 4.7K resistor across this cut as shown in the above illustration. Using 3 wire ribbon, solder each end to the switch and carefully solder the corresponding end to the locations as shown. Make sure that the center wire of the switch connects to pin 11, the bottom wire to pin 9, and the top wire connects to board ground. Some slight adjusting of the VCO Coil (L18) may be necessary to pop these channels in.

SW-1 in the Center Position = Normal Channels

SW-1 in the Down Position =

12=26.335
13=26.345
14=26.355
15=26.365
16=26.385
17=26.395
18=26.405
19=26.425
20=26.445
 
21=26.455
22=26.465
22=26.465
23=26.495
 
24=26.475
25=26.485
26=26.495
27=26.505
 

SW-1 in the Up Position =

12=27.875
13=27.885
14=27.895
15=27.905
16=27.925
17=27.935
18=27.945
19=27.955
20=27.975
21=27.985
22=27.995
23=28.025
24=28.005
25=28.015
 
26=28.035
27=28.045
28=28.055

 

MB8719 Rotary Switch
Cobra 2000 GTL

8719 Rotary Switch for COBRA 2000 GTL

1. Obtain a Double Pole/ 6 Position Rotary Switch. Be sure to get the Break Before Make type. You will also need 2 small signal diodes (1N914, 1N4148 or Equivalent), a piece of 5 wire ribbon cable long enough to reach from the switch to the PLL chip connections, and 1 4.7k 1/4 watt resistor. Also if the MB8734 has not been changed to an MB8719, you will need to change it before proceeding. Next solder the diodes to the switch as shown in the diagram above. Be sure that the cathode ends (Banded) are as shown once you have completed this step. The diode that connects between Pin 4 & Pin 5 should have the banded end to Pin 4 and the diode the connects between Pin 1 & Pin 4 should be the same.

2. Next locate Pin 14 of the PLL and using an ex-acto knife carefully isolate Pin 14. Next solder the 4.7k resistor across this cut in order to allow Pin 14 to operate at its normal state. Once this has been done you may connect the ribbon cable to switch prior to mounting the switch in it's permanent location. Be sure that the wires are connected as shown in the above diagram. Once that you have mounted the switch you may then make the connections to the PLL chip as shown above. Re-check all your connections before turning the unit on . The channel chart on the next page shows your new frequencies. Check all positions of the switch for these channels. Some adjustment of the VCO, coil (L19) may be necessary in some cases for full channel coverage.

POSITION #1 =

15=26.815
16=26.835
17=26.845
18=26.855
19=26.865
20=26.885
21=26.895
22=26.905
23=26.935
24=26.915
25=26.925
26=26.945
27=26.955
28=26.965(Chl)
29=26.975(Ch2)
30=26.985(Ch3)
31=26.995(3A)
32=27.005(Ch4)

POSITION #2 = Normal Channels

POSITION #3 =

37=27.415 38=27.425 39=27.435 40=27.445

POSITION #4 =

15=27.455
16=27.465
17=27.475
18=27.495
19=27.505
20=27.525
21=27.535
22=27.545
23=27.575
24=27.555
25=27.565
26=27.585
27=27.595
28=27.605
29=27.615
30=27.625
31=27.635
32=27.645
33=27.655
34=27.665
35=27.675
36=27.685
37=27.695
38=27.705
39=27.715
40=27.725

POSITION #5 =

1=27.605
2=27.615
3=27.625
4=27.645
5=27.655
6=27.665
7=27.675
8=27.695
9=27.705
10=27.715
11=27.725
12=27.745
13=27.755
14=27.765
15=27.775
16=27.795
17=27.805
18=27.815
19=27.825
20=27.845
21=27.855
22=27.865
23=27.895
24=27.875
25=27.885
26=27.905
27=27.915
28=27.925
29=27.935
30=27.945
31=27.955
32=27.965
33=27.975
34=27.985
35=27.995
36=28.005
37=28.015
38=28.025
39=28.035
40=28.045

POSITION #6 = Normal Channels

MB8734 REPLACED WITH MB8719
Tram D80 et al:

Replace the 8734 with 8719

1. The TRAM D80 came from the factory with a MB8734 PLL chip installed . The above modification will work after changing this chip to an MB8719 PLL chip. Procedure is to carefully unsolder and remove the MB8734 chip, taking special note to how it was installed. The MB8719 is a direct replacement and on the older radios has pin 18 marked with a dot the same as the MB8734 chip. However please note that some of the newer radios have the dot on pin 1 of the MB8719 chip. So be very careful, be sure the new chip is installed properly. We recommend that you use a 18 pin IC socket to install the new MB8719 chip.  Once that you are sure that you that you have the new MB8719 chip installed correctly, and that the radio works properly , then you may proceed with the above modification.

2. Mount 2 SPST Toggle switches in a convenient location . Be sure to wire the switches up as shown and to solder each wire carefully.

3. Now with both switches in the down position you will still have the normal channels. Refer to the 8719 Channel chart above for the switch positions and their associated channels.

MB8734 REPLACED WITH MB8719
Tram D300, Realistic TRC-490 et al:

8719 modification tram, rat shack

1. Unsolder and replace the MB8734 PLL IC with a new MB8719 IC Chip. Use an IC socket when replacing any Integrated Circuit for safety. Refer to the diagram above, and locate pin 10 of the newly installed MB8719 PLL chip. Notice that it is connected to ground. Make a small cut and totally isolate this pin from ground. You will need to isolate both sides of pin 10, and then connect a jumper across these cuts in order to tie just the two ground sides back together. (Do not reconnect Pin 10). Make sure that once this has been done that pin 10 is totally isolated. Next, turn the radio on and check to make sure that you have all of the normal channels and that the frequencies are correct before proceeding. If necessary adjust CT3 for USB first, then L19 for LSB, and L20 for Am while the clarifier is set to center slot. {This conversion is basically the same as the conversions for the Cobra 2000.}

2. Next mount your switches and wire them up as shown in illustration above. Be sure to check all of your
connections before proceeding. Refer to the 8719 Channel Chart above for your new frequencies.

Note : Some of the older MB8719 Chips have the dot marking on pin 18. The newer MB8719 chips have the dot marking on pin 1. Regardless pin 1 is always the first pin to the top of the indentation marking on one end when viewed from the bottom side of the circuit board as shown above in Fig. TRC490.

MC145106
120 Ch. AM/FM Chassis
Superstar TEK 505D, Superstar 120 and like.

MCM145106 AM/FM 120 Ch Freq Mod

Switches work in conjunction with the band selector switch
An extra switch can also be added to pin 17 for 10KHz up on some channels:

MCM145016 + 10KHz mod

MCM145106 Rotary Switch for 120 Ch Rigs

[ROTARY] POSITION #1= Normal Channels
[SWITCH] SW-1 Down, SW-2 Down & SW-3 Down = Normal Channels

[ROTARY] POSITION #2 & HI Band Position =
[SWITCH] SW-1 Up & SW-2 Down & SW-3 Down & Hi Band Position =

1=27.735
2=27.745
3=27.755
4=27.775
5=27.785
6=27.795
7=27.805
8=27.825
9=27.835
10=27.845
11=27.855
12=27.875
13=27.885
14=27.895
15=27.905
16=27.925
17=27.935
18=27.945
19=27.955

[ROTARY] POSITION #3 & MID Band Position =
[SWITCH] SW-1 Up, SW-2 Up, SW-3 DOWN & Mid Band Position =

33=27.605
34=27.455
35=27.995
36=28.005
37=28.015
38=28.025
39=28.035
40=28.045

[ROTARY] POSITION #4 & HI Band Position =
[SWITCH] SW-1 Up, SW-2 Up, SW-3 Down & Hi Band Position =

1=28.055
2=28.065
3=28.075
4=28.095
5=28.105
6=28.115
7=28.125
8=28.145
9=28.155
10=28.165
11=28.175
12=28.195
13=28.205
14=28.215
16=28.245
17=28.255
18=28.265
19=28.275

[ROTARY] POSITION #5 & HI Band Position =
[SWITCH] SW-1 Down, SW-2 Down, SW-3 Up & Hi Band Position =

11=26.255
12=26.275
13=26.285
14=26.295
15=26.305
16=26.325
17=26.335
18=26.345
19=26.355
20=26.375
21=26.385
22=26.395
23=26.425
24=26.405
25=26.415
26=26.435
27=26.445
28=26.455
29=26.465
30=26.475
31=26.485
32=26.495
33=26.505
34=26.515
35=26.525
36=26.535
37=26.545
38=26.555
39=26.565
40=26.575

MC145106 PLL
US [SSB] Chassis

Palomar SSB-500 (Late), Colonel FR360 and similar:
Browning Mark 4A, Cobra 148GTL-DX, Dak Mark V, Robyn 440, Dak Mark IX, Lake 600, Arthur Fulmer 15-4040, Regency CB501, SBE 54CB Keycomm 1000

MC145106 SSB Chassis

1.Unsolder the brown & red wires from the NB switch. Now solder these two wires together, and seal with heat shrinkable tubing. This will allow your Noise Blanker to be in the on position at all times. Next unsolder the Brown wire & Gray wire from the ANL switch. Seal the unsoldered ends with heat shrinkable tubing. Do not solder the Brown wire and the gray together. Again this will allow your ANL circuit to be on at all times. Next unsolder the Orange wire and the Red wire from the RF Gain switch. Solder these two wires together and seal this connection with heat shrinkable tubing. Next unsolder the two red wires from the Brite & Dim switch. Again solder these two wires together and seal up with heat shrinkable tubing. This will allow the brite circuit to be on at all times. Next remove the 470 ohm resistor from the Brite & Dim switch.

(if your rig does not have the same switches as the Palomar SSB-500, simple mount 4 SPST switches in a convenient location)

2. Once the above step has been completed, proceed to wire the switches as shown in the diagram pictured above. Now with all switches in the down position you will still have the normal 40 channels. A channel chart is provided below for reference of your new channels.

NB SWITCH UP ANL SWITCH UP NB & ANL SWITCH UP RF GAIN SWITCH UP NB & RF GAIN SW UP
33-27.415
34-27.425
35=27.435
36-27.445
37-27.455
38=27.465
39-27 475
40-27.485
33-27.495
34-27.505
35-27.515
36-27.525
37-27.535
38=27.545
39-27.555
40-27.565
33-27.575
34-27.585
35-27.595
36-27.605
37-27.615
38-27.625
39-27.635
40=27.645
33-27.655
34-27.665
35-27.675
36=27.685
37=27.695
38=27.705
39-27.715
40=27.725
33-27.735
34-27.745
35=27.755
36-27.765
37=27.775
38=27.785
39=27.795
40=27.805
ANL & RF GAIN UP NB,ANL,RF GAIN UP BRITE SW UP NB & BRITE SW UP ANL & BRITE SW UP
33=27.815
34=27.825
35-27.835
36-27.845
37=27.855
38=27.865
39=27.875
40=27.885
33-27.895
34-27.905
35-27.915
36-27.925
37-27.935
38=27.945
39=27.955
40-27.965
33-27.975
34-27.985
35-27.995
36-28.005
37-28.015
38=28.025
39=28.035
40-28.045
33=28.055
34-28.065
35-28.075
36-28.085
37=28.095
38=28.105
39=28.115
40=28.125
33=28.135
34=28.145
35-28.155
36=28.165
37=28.175
38-28.185
39=28.195
40=28.205

MC145106 (on EPT360014B, etc.)
Typical "6 Band Export Chassis" Frequency Modification.

25 MHz Modification:

MC145106 25 MHz Mod 

1.) Remove both radio covers and unplug the speaker wires from the circuit board. Next isolate the circuit board run that connects pin 11 of IC7 to Pin 12 of IC5 (MC145106 PLL). Using an x-acto knife, carefully cut and isolate Pin 12 of IC5 as shown in the diagram above.

2.) After you have completely isolated Pin 12 of IC5, solder a 4.7K 1/4 Watt resistor from Pin 12 of 1C5 to circuit board ground as shown above.  Next mount a SPST toggle switch in any convenient location and wire as shown above.

3.) Re-check all connections and plug speaker wire in before applying power. Sec the chart below for your new 25MHz channels.

Flip-Switch down and Band Selector in the "A" Position:

5=25.345
6=25.355
7=25.365
8=25.385
9=25.395
10=25.405
11=25.415
12=25.435
13=25.445
14=25.455
15=25.465
16=25.485
17=25.495
18=25.505
19=25.515
20=25.535
21=25.545
22=25.555
23=25.585
24=25.565
25=25.575
26=25.595
27=25.605
28=25.615

29 MHz Modification:

MC145106 29 MHz Mod 

1.) Remove both radio covers and unplug the speaker wires from the circuit board. Next locate Pin 12 and Pin 13 of 1C7 (MC14008BCP adder chip). This conversion is shown from the component side, however you could also perform this conversion from the circuit board side instead.

2.) Next mount a SPST toggle switch in any convenient location and wire as shown above, being careful not to short any other pins of IC7 with a solder bridge while soldering the wires from the SPST switch.

3.) Re-check all connections and plug speaker wire in before applying power. See the chart below for your new 29MHz channels.

Flip-Switch up and Band Selector in the "F" Position:

4=29.185
5=29.195
6=29.205
7=29.215
8=29.235
9=29.245
 
10=29.255
11=29.265
12=29.285
13=29.295
14=29.305
15=29.315
 
16=29.335
17=29.345
18=29.355
19=29.365
20=29.385
21=29.395
 
22=29.405
23=29.435
24=29.415
25=29.425
26=29.445
27=29.455
 
28=29.465
29=29.475
30=29.485
31=29.495
32=29.505
33=29.515
 
34=29.525
35=29.535
36=29.545
37=29.555
38=29.565
39=29.575
40=29.585

MC145106
Palomar SSB-500 and like chassis
"Divide By 5" modification - gives frequencies ending in ".000"

a. Ground Pin 6 (PLL Chip) for divide by 5 through a switch,
b. +5 to 6 VDC to Pin 6 (PLL) for divide by 10 through a switch.
Use one switch for this, such as a miniature SPDT center off toggle or DPDT center off.

SM5104 PLL
SSB Chassis, Sears Model 934.38270700
and like:

SM5104 PLL Freq Mod

Once you have the radio apart you will need to unsolder the metal cover in order to expose the pins on PLL chip ( SM5104 ). Next make all needed cuts and add the 4.7K resistor from pin 8 board ground. Be sure the wire leads do not short to any other pins or connections.

Next mount your rotary switch in any suitable location. Wire the switch as shown above.

Be sure to add the IN4148 or 1 N914 signal diode from pint to pin 4 of the rotary switch. Cathode (banded end) connects to pin 4. Jumper pins 2A, 3A, 4A, & 5A together.

Some slight adjustment may of T302 (VCO) may be needed in order to cover all channels. T302 is located just behind the PLL chip. Be sure to use only a square plastic tool when adjusting this can. The coils break easily and it is very difficult to find replacements.

Position #1 =

1=26.485
2=26.495
3=26.505
4=26.525
5=26.535
6=26.545
7=26.555
8=26.575
9=26.585
10=26.595
11=26.605
12=26.625
13=26.635
14=26.485
15=26.495
16=26.515
17=26.525
18=26.535
19=26.545
20=26.565
21=26.575
22=26.585
23=26.615
24=26.595
25=26.605
26=26.625
27=26.635
28=26.805
29=26.815
30=26.825
31=26.835
32=26.845
33=26.855
34=26.865
35=26.875
36=26.885
37=26.895
38=26.905
39=26.915
40=26.925

Position #2 = FCC 40 Channels

Position #3 =

12=27.425
13=27.435
14=27.445
15=27.455
16=27.475
17=27.485
18=27.495
19=27.505
20=27.525
21=27.535
22=27.545
23=27.575
24=27.555
25=27.565
26=27.585
27=27.595

Position #4 =

1=27.605
2=27.615
3=27.625
4=27.645
5=27.655
6=27.665
7=27.675
8=27.695
9=27.705
10=27.715
11=27.725
12=27.745
13=27.755
14=27.765
15=27.775
16=27.795
17=27.805
18=27.815
19=27.825
20=27.845
21=27.855
22=27.865
23=27.895
24=27.875
25=27.885
26=27.905
27=27.915
28=27.925
29=27.935
30=27.945
31=27.955
32=27.965
33=27.975
34=27.985
35=27.995
36=28.005
37=28.015
38=28.025
39=28.035
40=28.045

TC5080P AM Mod #1:
Sears Model 562.38200700 and like chassis.

The Toshiba TC5080P will be present, ALONG WITH
the TC5081 Phase Comparator AND
the TC5082 Reference Oscillator and Divider.
Make sure you're operating on the proper IC!!

TC5080P /81 / 82 Freq Mod #1 

1. Mount a DPDT/Center Off switch in a convenient location.

2. Locate the small 2" square metal plate that is soldered to the bottom of the circuit board. Locate the pins of the 5080 PLL IC that are located just to the right of this plate. After you have located Pins 5, 6, 7 and 8, carefully solder a wire to each pin. Make sure to use enough wire to easily reach your switch.

3. Solder the opposite end of each wire to the correct position of your switch. Check to make sure that your channels are right. With the switch in the center position you will have normal channels. This modification allows you to go from channel 41 to channel 58 without any skips.

Switch in DOWN Position =

3=27.145 (15A)
7=27.195 (19A)
27=27.435
28=27.445
29=27.455
30=27.465
31=27.475
32=27.485
33=27.495
34=27.505
35=27.515
36=27.525
3l=27.535
38=57.545
39=27.555
40=27.565

Switch in UP Position =

12=27.425
20=27.505
21=27.535
22=27.545
23=27.575
24=27.555
25=27.565
26=27.585
33=27.415
34=27.425

 

TC5080P AM Mod #2
Cobra 32XLR, Cobra 86XLR, Tram D42, etc.

5080 AM Chassis Mod #2

1. Locate Pin 8 of the 5080 PLL. There will be a green wire connected to it. The other end of this green
wire goes to Pin 13. Carefully unsolder the green wire from Pin 8. Next remove the excess solder from
the Pin 8 land with some solder wick. Once this is done make a small cut with an ex-acto knife in order to
isolate just Pin 8 of the 5080 PLL. Be sure to totally isolate this pin. Next carefully solder a 100k 1/4watt
resistor from Pin 8 to ground. Now re-solder the green wire to the other side of the cut.

2. Next mount 2 SPST toggle in a convenient location. Be sure to orient the poles of the two switches as
shown in the above diagram. Next using some 4 wire ribbon cable connect the switches to the circuit
board as shown in the above diagram. Be sure to check for any solder bridges that may have occurred
while soldering the wires to the PLL chip. Once completed your conversion should match the diagram
above. Refer to the 5080 Channel Chart below for your new frequencies.

POSITION #1 SW-1 Down and SW-2 DOWN = Normal Channels

POSITION #2 SW-1 UP and SW-2 UP

3=26.665
4=26.685
5=26.695
6=26.705
7=26.715
8=26.735
9=26.745
10=26.755
11=26.765
12=26.785
13=26.795
14=26.805
15=26.815
16=26.835
17=26.845
18=26.855
19=26.865
20=26.885
21=26.895
22=26.905
23=26.935
24=26.915
25=26.925
26=26.945

POSITION #3 SW-1 UP and SW-2 DOWN

11=27.405
12=27.425
13=27.435
14=27.445
15=27.455
16=27.475
17=27.485
18=27.495
19=27.505
20=27.525
21=27.535
22=27.545
23=27.575
24=27.555
25=27.565
26=27.585

uPD861 AM Chassis.
Realistic TRC-431 and similar:

uPD861 TRC-431

1. Locate the metal plate on the bottom of the board which covers the upD861. Carefully bend up the tabs in order to remove and to expose the board underneath. This plate will need to be re-installed once the conversion is completed.

2. Notice that Pin 7,8,12 are all tied to the VCC+ (6.2V Supply). Using an ex-acto knife, carefully cut the circuit board in order to totally isolate pin 7 of the PLL chip. Next solder a 4.7k resistor across this cut. This will allow Pin 7 to still operate at it's normal state.

3. Next mount a DPDT/Center Off toggle switch in a convenient location. Following the diagram above,vwire the switch to the radio circuit board as shown. Once completed recheck all connections. If all the channels are not present as shown below, some slight adjustment of T802 (VCO) and T803 (37 MHz Can) may be required in order to pop them all in.

POSITION #1 Switch Down

1=26.645
2=26.655
3=26.665
4=26.685
5=26.695
6=26.705
7=26.715
8=26.735
9=26.745
10=26.75
11=26.765
12=26.785
13=26.795
14=26.805
15=26.815
16=26.835
17=26.845
18=26.855
19=26.865
20=26.885
21=26.895
22=26.905
23=26.615
24=26.915
25=26.605
26=26.625
27=26.635
28=26.645
29=26.655
30=26.665
31=26.675
32=26.685
33=26.695
34=26.705
35=26.715
36=26.725
37=26.735
38=26.745
39=26.755
40=26.765

POSITION #2 SWITCH CENTER = NORMAL CHANNELS

POSITION #3 SWITCH UP

11=27.405
12=27.425
13=27.435
14=27.445
15=27.455
16=27.475
17=27.485
18=27.495
19=27.505
20=27.525
21=27.535
22=27.545
24=27.555