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

I have noticed two XTALS on the board for the PLL.But I'm sure if changin them would be the right move.Im not familer w/ the PLL chip in use,and it is soldered in(no XTAL socket). Any help w/ this would be greatly app. Desir.Freq. 26.900 to 27.550 mHz THANKS AGIAN WMC The frequency conversion can b...

Mattflyrc wrote:will the built in freq meter work properly?

Yes, but the DX959 VFO and tuning coils are not as wide banded as the 10-meter models so you will have some power and receiver loss when setting them up for 10-meter operation.

Hallo I wonder how much power in SSB band should I have min,med,max.My radio does have: Min:20 PeP Watt Med:35 PeP watt Max:50 Pep watt If I goes over 50watt in max power the modulation sounded distored.I not have a scope to check the radio. Best ragards Jan It's 50 watts max on SSB. Anything more ...

the dx 98 vhp has the same board. if you look at the schematic for the dx-98vhp the main board is dual mosfet and should get you well on you way. Make sure the 3rd leg of the bias pot is soldered to ground on the driver circuit. If you dont do that you wont be able to set your bias on the driver to...

I have a galaxy dx-44 on the bench here. When i got it it had to tx or rx and i found that tr43 and tr44 were both shorted. I replaced them and tr36 wich was shorted out. I have tx back now and working perfectly. Now on the rx side i found that someone put a 1n4148 in place of a 7.5volt zener at d7...

How do you tell what suffix is on your mosfets? I can't seem to find anything on my IRF520's....can you gimme a hint? I'm gonna be picking up a Galaxy DX88 real soon, and I wanna do this mod... if I can't get it done, I might have GRTS look into it for me. Thanks guys. :D -Exit I'm not sure how to ...

Well finally got it giong. I was having a blonde moment and forgot to move the exta capacitors from the bottom of the board. Duh!! Well with that and the 2sb827 and all the other stuff being done it works better than the new DX-33hp. I got 29 watts average on the meter on my R2200B comunications an...

Oh In the manual it says to set the driver at 3.8 and the finals to 3.6volts. I will change that. I put the 2SB754 back in and did pick up a couple of watts . I can now key 10 and swing to 21 wats avg. I am getting 40 PEP on my bird now. Almost there!! I was looking at the 2sb827 and it has a highe...

New Update: Radio operates, however, there is an issue that when I tune certain channels, it sounds like a guitar string strumming. When I switch to SSB, it sounds like a guitar or rubberband. Both of these noises only last for a second or less. If I touch the vco area I can also make the noise. I ...

AARRGGG. well I am getting about 8 watts deadkey i can turn it up to 12 but It is peaking out at 32 watts pep before it starts to flat top the waveform. It is like i am not getting enough drive from the audio to push it the rest of the way or something. tr51 is getting pretty warm real fast. On my ...

On the solder side of VR11 you'll see an open leg not normall soldered.

Scratch some of the green coating off the main PCB and solder that open pin to ground.

That should let you control the gate voltage.

I think that we need to go back to a systematic approach... Set the radio to CH1 on normal CB band, check the voltage at PLL pin 7 and note it down. Lift one end of R116 to disconnect the PLL PD output from the VCO. Use a variable power supply (I recommend using a pot across the PLL DC supply at pi...

If you have 16.270mhz on the input of IC10 pin 7 and 13.560mhz on the input of IC10 pin 2 then check that 16.270 output is on IC10 pin 9 going to L22 L22 has a 16.270 tap that goes back to IC10 pin 4. Check that L22 is aligned for max output at IC10 pin 4. The 16.270mhz on IC10 pin 4 is mixed with t...

You will need to replace the 2SC2166 with an IRF520 for higher peak power to the finals. You have plenty of carrier but need higher peak power from the driver to drive the finals. C171 and C209 need to be silver mica or mylar caps. Try finding the exact values and don't double up those caps. I think...

The easiest way to troubleshoot the PLL/VCO/Mixer circuit is to break the loop and inject your own voltage. Unsolder IC5 pin 7. Inject 3.0 volts at TP2. Connect freq. counter to TP3. Adjust L17 for 16.270mhz on the freq. counter. If that's bad look at TR25 and TR26. Should have 16.270mhz on TR25 (em...

email sent.

Exit_Thirteen: I have the display shown in the pictures below. It is brand new and still has the clear plastic from the factory on the front face for protection. Send me a PM and let me know what you feel it's worth. I'll pay the shipping to you. -Ray http://www.cbtricks.com/ray/100_0106.jpg http://...

Well this is an interesting one. I have a galaxy dx 33hp and this other galaxy 88hml. both with the 3600 series boards. i went through the dx 88hml and updated everyting in it to match the 33hp's mosfet setup. in the end the am regulator gets pretty warm and it only puts out 18 watts. verses 17 wit...

I think you might be in luck. Give me a few days to dig through some boxes at home and if you don't hear from me by Tues/Weds, then give this thread a bump.

Are you able to post a picture of what the display itself looks like? Oddly enough I still have a few displays around from the old repair shop days. It's possible I might have the one you need.

Thanks,for the help.There is 8volts at J5 so i looked at the mofsets and on the left bank there are 2 that are shorted out and T6 and r28 are burnt out as well. Is there anything else i should check before i order these parts? Before you order parts, remove all four mosfets on the bad bank and phys...

Hello forum members. I have a galaxy98vhp which was working fine untill now. Now my problem is i can send it back for repair or try and get some advice to fix it.Now you will probably think why just no send it back....well it was a international buy and freight will be high. So anyway this is the p...

Disconnect the radio from DC power and remove the bottom cover. Once you have the bottom cover separated, remove the amp cover. Using an ohm-meter, test the mosfet leads for shorts. Most likely you'll fine one bank of 4 blown and other 4 good. Unsolder the feedback pcb from on top of the bad bank of...

Well I've never heard this one before.... Doing what you ask will not get you more power in AM mode or any further range when talking or receiving. If you've read or been told this you should disregard. Just enjoy your radio as it was built and when you're on AM the SSB portion is automatically shut...

Since no amp is 100% efficient you have to add that to the formula when deciding what power supply to use. At 13.8 volts the TS DX500V is rated at approx. 500 watts. Like frogman said you need some headroom so 50% is a safe number and that's part of the formula as well. To determine the proper regul...

Try here, http://www.citizensband.radiouk.com/repair/mics.php

Found another, http://www.thunderpole.co.uk/mic_wiring_realistic.htm

As you can see by these links, the UK has it all......

I Have A Galaxy 95t That Was Tuned For 11 Meter But Was Not Peaked Or Tuned For A Low Dead Key. It Dead Keys 40 Watts And Swings To 80 Watts With Variable Turned Down. Can I Get A Low Dead Key With A High Swing With This Radio. It Has Two 2290 Pills Thanks For Any Help The low deadkey should be clo...

Spreading air wound coils on the output of the transmitter will appear to increase power but you're doing more harm than good. L28, L29 and L30 form a 54mhz series tuned trap to reduce harmonics. Stretching or reshaping these coils increases harmonic power giving you a false sense of increased power...

Depending on how much SSB you run, you "can" remove Q39, which is the modulation limiter, but it tends to distort the SSB pretty bad. I recommend you do NOT remove Q39, but simply solder in a 1k ohm 1/4 or 1/8 watt resistor inline with the emitter leg of Q39, and reinstall in the board. T...

I've seen that problem on older boards and the cause was low output from the 10.240mhz reference oscillator.

My second guess would be try replacing the RCI8719 PLL. Take a look to make sure somebody didn't try using the MB8719 and if so replace it with the RCI-8719.

Hi, I am in need of information to properly set the programming pins in an old Redco UFO unit. I have the Digiscan 400 manual which is a help for wiring the unit to the radio, but I need the truth table for the program pins in the Redco. Anyone have a manual? I have all the editions of Secret Cb ex...

hotrod wrote:these meters are alot like the bird meters .just curious
if anyone has tried this meter

I have two Coaxial Dynamics 81000-A meters.
Very ruggedly built like the bird but has a larger meter.
Also will use the same slugs.