The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

I just need to know if there is some super talk kit for the Midland 79-893 and Many Thanks Anticipated.

You can install the UC-1205 too.It is because there is no sellers right now and is more easy to find the UC-1205.There is a seller on E-Bay taht have a lot of the UC-1205 PLL for sale at great price.

UUUUUUUppppsssssssss!!!!!!!!

I am in the middle of the frequency modification of my Panasonic RJ-3700 radio.This radio came from the factory with the SM5104 PLL.I did the frequency modification and i have the coverage between the CB regular CB channels and the 10 Meter frequencies and this includes the 28.315Mhz. with the ...

Hi to all;I have a big problem with my Emperor TS-5010 and i need to know if i can exchange the original PLL (HD614081) with the HR-2510 PLL(UC1250).It is because i bought this radio couple of days ago and i founded that this radio was used with the power cables inverted.The radio has couple of ...

If the Road Devil and your radio is in the original condition this combination is the correct:

Pssss;Remember to solder together the shield and the blue cable in the pin#1,next follow the rest of the pin out wiring as stated in my instructions.

Here is the Info:

Pin#1=Shield=Road Devil "Shield&Blue"
Pin#2=N/C
Pin#3=Transmit=Road Devil "Red"
Pin#4=Audio=Road Devil "White"
Pin#5=Receive=Road Devil "Black"

Im not trust any transistor tester when i work with the 2SC2312 or the 2SC1969 transistors.In sometimes the transistors read "Ok" when is really bad and i have three different transistors testers.

Psssss;And you have to test your amp final transistors,because with 1 watt of output you should have ...

31:Can you check your 2SC2312 Final transistors?

It is because this is a very common problem in this type of radio when you have one bad or leaked of the 2SC2312 Final transistors!!!!

Go it!!!!

Here is the mod for the ALS-500 Ameritron amplifier without the MOD-10M kit."The kit cost $29.95 plus S&H"

1.With the front of the amplifier facing to you in the left front side you have to locate 4 little towers.
Note:The first and the third tower are grounded together via the chassis ...

The amp has 4 2SC2879 final transistors and the input network of this amp is electronically controlled.Tomorrow i am going to make a direct jump between the Aux position and the first stage of the Pi-network for test if the SWR is OK.The input circuit of this amp looks exactly of the 15,20,40 Meters ...

Hi at everyboby;I need the Ameritron ALS-500 Export type amplifier schematic.It is because i got one but this amp not have the 10 meters frequency modification.I got a lot of different types of Amateur Amplifier schematics and a lot of info about Amateur Amps modifications,but not for the ALS-500 ...

1.Remove the back sticker.
2.Remove the cartridge screw.
3.Remove the cartridge from the base and adjust the screw.There is another screw behind the top of the front side of the cartridge base.

I use one side razor blade for remove the sticker!!!!!!!!!

If your Washington has the MB8719 PLL you can get so many extra channels as well as the Washington with the 858PLL too.The mods for the Washington with the MB8719PLL covers the 26.175MHZ to 28.045 with just couple of cuts in the PLL traces and with one six position doble pole switch from Radio Shack ...

When i have done the RX modification for improve the radio reception capabilities i uses the NTE23 transistor,because the NTE23 transistor is a high gain transistor and has a noise filtering on it,but the pin out is different.


You will need to reorient the NTE23 transistor pins to work.I uses a ...

You probably have a bad trace from the TR51 to TR41.This trace runs in the side of the board.

Check first the transistor located in the side of your radio for a broken trace.There is a little trace that goes from the transistor to the front of your radio circuit and i founded many radios with this type of problem with a bad trace.Next you have to check the CB/PA switch for a broken wire in ...

Can you test this radio with another frequency counter?

If your radio has the same problem with an external Freq. Counter you have to take a look for a crack or bad solder connection in the crystals.But if your radio is stable in frequency with an external Freq. Counter you have to test the D528 in ...

Yeap!!!!!!

You can find out the same info in the CBtricks.com link too.

I founded alot of this type of radios with a Corean Driver or final transistor.Take a look in the Driver (2SC2166) and in the Final (2SC2312).If the metal in the transistors is nickel in color you have a piece of Corean S???? transistors.The original Mitsubishi transistors or a good brand of ...

The TR5 is a high failure part in this radio.9 of 10 Cobra 138XLR and the Cobra 139XLR with a bad reception or no RX the problem is the TR5.The Dynascan Cobra company has a Service bulletin for the NO RX problem in this type of radios.I fixed one Cobra 139XLR today with the same problem.In this case ...

This is a very usual problem in this radio.For example:If your radio has the peak Mod when you push the power swich at the Hi power position,the RF meter in the radio shows the RMS power,not the PEP power and the radio shows an incorrect SWR readings.But in the Lo power position,the RF and the SWR ...

Hi at all;I have in my shop 9 Cobras 200GTL-DX with the TX power problem in the Hi Position.I founded the problem."A bad Driver transistor".The driver part number is #RD16HHF1.I make a call at the Cobra service department,because this part does not have any replacement.The original Cobra part number ...

Now, when the radio warms up the radio has just 10 watts of output.I think this radio is a "Lemon". :cry: I have another Cobra 200 GTL-DX unmodified and I did the test and when is warm up the radio losses the output power,but just in the Hi Power.







Unit 67

CBrules;I leave the info for the modification in your PM.








Unit 67

Hi at all;I have a Cobra 200GTL-DX in my Bench.The radio is the lastest edition,because he came with the final transistors 2SC2290S.I did the all modifications in my radio,but this radio has just 95 Watts dead key and swings 130 Watts in my Bird meter,but the audio sounds "Muffled" in the AM mode.I ...