Question about Magnum S9 Base CB Radio

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Am fm power to high keyup 60 watts ssb works fine mosfet 2030

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If SSB works. then the AM - Regulator Transistor is bad.

Posted on Apr 03, 2017

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Posted on Jan 02, 2017

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SOURCE: hi mys9 with 1969

In answer to your question, no, it is no a problem with the final. I would try turning the ALC control (VR12) until you have 45 Watts out. (Ref Magnum S9 alignment procedure on CBtricks.com.

....Don at NTCB, Inc.

Posted on Jun 29, 2011

  • 6771 Answers

SOURCE: NO variable power on FM,or SSB, but variable works ok on AM

Look for open resistors near by, if the 2SC1969 shorted it has taken out one or two parts, also check for open foils on the printed circuit, beyond this a circuit diagram is needed.

Posted on Mar 24, 2012

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1 Answer

How do i know if my palomar 250 is a high drive or low drive amp


If it is made by Palomar and it is a small amplifier, you can bet it is a low drive. Check those transistors. It could have the new Mosfet 655's in which case definitely low drive 3-6 watts input max.

Mar 30, 2014 | Palomar 250 SSB/AM Linear Amplifier for...

1 Answer

No variable powere or am modulation


the "am" regulator is shorted. 2sa743 2sa1012or equivilent. less than $5 part..

Feb 04, 2014 | Magnum DeltaForce CB Radio

1 Answer

Rci 2990 won't keyup


If on all modes check the mic first to see if wired right or wires broken--this should have am-fm-lsb-usb---which works or do not work.

Apr 24, 2012 | Radio Communications

1 Answer

Ihave a gargeled recive sound


Check the position of the mode selector switch. You may be receiving a SSB (single side band) transmission that is not on the exact same frequency as you or, your radio is in AM or FM mode. You will need to select either USB or LSB (upper or lower side band) and vary the clarifier knob until the sound becomes intelligible. If the sound does not become clear, try the other side band and repeat varying the clarifier knob.

Conversely, if you are in USB or LSB mode and there is a transmission on AM or FM, it will have the same garbled sound. Try changing the mode to AM and the FM. If it does not become clear, it is likely a SSB transmission and you are not on the exact same frequency of the transmission you are hearing. Vary the clarifier knob until it becomes clear - or change to the other side band if needed and try the clairfier again.

The short story is that you must be in the same mode and on the same exact frequency. When in AM or FM, this is less of a problem as these are much more wide banded signals than SSB signals.

The 2990 is really a 50 watt 10 meter amateur radio - but is geared to CBer's as it is easily modified to work in the CB frequency range and the so called "free band" between USA's CB (11 meters) and worldwide amateur 10 meter bands. Be careful transmitting this radio on CB frequencies as it violates FCC rules for power output there - and transmitting in the 28MHz - 29.7MHz requires a valid amateur radio license. Fifty watts on ham frequencies is tiny compared to the 1500 watts permitted. Why not get your ham license (here's how) and leave the "Chicken Band" (and all it entails) behind. You won't miss it!

I hope this helps and good luck!

Apr 12, 2012 | Cobra Radio Communications

1 Answer

Cobra 200 gtl dx only does 12 watts on high


Open radio up and adjust rv9for am fm high power or rv 14 for ssb for high power,do not use a screwdriver,a matchstick would be better.board information is available from cb tricks.com

Dec 17, 2011 | Cobra 200 GTL DX 4-Channels Base CB Radio

1 Answer

I could not find a brand name on the radio but it does say mosfet 60w x 4. As far as i know i wired evrything correctly and failed to get power>


Mosfet is the type of output amplifier the radio has. Most modern radios have it. 60 rms watts indicates its a rather high end, and powerful radio. Very few deliver this kind of power. However, if it is 60 peak watts, then it translates to a measly 10 watts or so. Not being able to see the brand means that this is an OEM radio. Can you at least get the radio to illuminate? Or you dont know which cables power up the radio? keep me posted

Mar 14, 2010 | Car Audio & Video

2 Answers

How to adjust frequency on transmit??? Galaxy


hELLO THERE
hERE IS SOME MODIFICATIONS FOR THIS RADIO
Galaxy Mods DX 2527 - VR 1....AM/FM S-Meter, VR 2....SSB S-Meter, VR 3....SSB Squelch Range, VR 4....AM/FM Squelch Range, VR 7....SSB Carrier Balance, VR 8....RF Meter, VR11...Driver Bias, VR12...SSB ALC, VR13...Hi Power, VR14...AMC, VR15...AM Low Power, VR16...SSB Low Power, VC 1....10.240, VC 2....10.240. DX 2517- VR 1....AM/FM S-Meter, VR 2....SSB S-Meter, VR 3....SSB Squelch Range, VR 4....AM/FM Squelch Range, VR 5....FM Deviation, VR 6....SSB Carrier Balance, VR 7....TX Offset, VR 8....CW Beep Level, VR 9....RF Meter, VR10...Final Bias, VR11...Final Bias, VR12...Driver Bias, VR13...SSB ALC, VR14...AM/FM High Power, VR15...AM Modulation Meter, VR16...AM Modulation, VR17...SSB Power, VR18...AM/FM Low Power, VR601..13.8 Volt Power Supply. DX 22B- VR 1....AM/FM S-Meter, VR 2....SSB S-Meter, VR 3....SSB Squelch Range, VR 4....AM/FM Squelch Range, VR 7....SSB Carrier Balance, VR 8....RF Meter, VR11...Driver Bias, VR12...SSB ALC, VR13...High Power, VR14...AMC, VR15...AM Low Power, VR16...SSB Low Power, VR21...TX Offset, VC 1....10.240, VC 2....10.240. DX 11B- VR 1....AM/FM S-Meter, VR 2....SSB/CW S-Meter, VR 3....SSB Squelch Range, VR 4....AM/FM Squelch Range, VR 5.....FM Deviation, VR 7....SSB Carrier Balance, VR 8....RF Meter, VR10...Final Bias, VR11...Driver Bias, VR12...SSB ALC, VR13...AM/FM High Power, VR14...AM Modulation, VR16...CW Tone Level, VR20...Final Bias, VR21...TX Offset, VR601..13.8 Volt Power Supply, VR803..AM/FM Low Power. DX 77HML, DX 88HL, and DX 99V- VR 1....AM/FM S-Meter, VR 2....SSB S-Meter, VR 3....SSB Squelch Range, VR 4....AM/FM Squelch Range, VR 5.....FM Deviation, VR 7....SSB Carrier Balance, VR 8....RF Meter, VR10...Final Bias, VR11...Driver Bias, VR12...SSB ALC, VR13...AM/FM High Power, VR14...AM Modulation, VR16...AM/FM Low Power, VR20...Final Bias, VR21...TX Offset.
Unmarked VR in R189..AM/FM Medium Power for DX 77HML only. DX 33HML, DX 44V, DX 55V, DX 66V, and DX 73V- VR 1....AM/FM S-Meter, VR 4....AM/FM Squelch Range, VR 5.....FM Deviation, VR 8....RF Meter, VR12...Low Power AM Modulation, VR13...AM/FM High Power, VR14...High Power AM Modulation, VR16...AM/FM Low Power.
Unmarked VR in R188..AM/FM Medium Power (DX 33HML only)
Unmarked VR in C139..Med Power AM modulation (DX 33HML only) DX 949,DX 959- VR 1....AM S-Meter, VR 2....SSB S-Meter, VR 3....SSB Squelch Range, VR 4....AM Squelch Range, VR 6.....SSB Carrier Balance, VR 7....TX Offset, VR 9....RF Meter, VR10...Final Bias, VR12...Driver Bias, VR13...SSB ALC, VR14...AM High Power, VR15...AM Modulation Meter, VR16...AM Modulation, VR17...SSB Power, VR18...AM Low Power, VC1....10.240. DX 2517 and DX 2527-
Symptom:Buzzing or motorboating sound in either the transmit or receive.
Problem: TR602 is oscillating
Cure: Replace C602 with a .01uF cap {Cap is located in the power supply board}.
RG 66,99,DX2517 Replace Q54 2SB754 60watt 7A with a higher power 2SB817 100 Watt 12A. Derating of this component will cool operation, provide better voltage stability,decrease wobble, allow voltage increase to 14.5 volts comfortably. (replace 10 volt caps in this section of the radio to a minimum of 16 volts before increasing supply voltage to this level)and provide faster swing rise time, Replace Q37 2SA473 to a 2SA1012-0 or ECG153 this will improve the clarity and volume of the modulation and it will also run a lot cooler.

Nov 12, 2009 | Galaxy Radios DX-949 40-Channels Base CB...

1 Answer

I have a galaxy93ttwin turbine that has a modulation prob on ssb


well i hate to tell you this but some cb ******* shop hacked the **** out of you radio and you have been ripped off they probably ripped all the audio limiters out volted the final and put that stupid modulation kit in there. unbeliveable. i hate the cb hacks that give good techs like me a bad name. shame on the hackers. that is why it does not work on sideband.

Jul 07, 2009 | Galaxy Radios DX-93T Base CB Radio

1 Answer

Excalibur works fine one day than not the next...


sounds like some loose solder joints. check power output with external meter to see if output is ok . i think youprobably have 2sc1969 finals init unles someone has changed them theyshould put about 25 watts if tuned correctly. also check the antenna a and antenna b switch to see if something has shorted across it inside cabinet.

Mar 16, 2008 | Radio Communications

3 Answers

Magnum omega force s45 cuts out


Im a Galaxy man myself and I swear by them .Looks like youve got more than enough power. The mosfets shouldnt have any effect that I recall but be aware that most new C B Radios are going to Mosfets Galaxy being one of them' because of transistors like the 2290 being hard to find and expensive. $20 + a pop.

Feb 26, 2008 | Magnum OmegaForce S45 CB Radio

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