Honest CB guy or shop needed..

WHAT ?

I don't know where you got that but for a AM/SSB radio a class "C" amp will NOT WORK. A TRUE CLASS C AMP would not allow any modulation at all or at least it would be so distrorted that it would be useless.

Since most of my on the air time is on FM I run class "C" amps.

MOST class "C" amps have a linear part to the driving curve which if you drive them lightly will allow you to get away with using AM/SSB even my 2 meter amp will allow this but the max output will be only about 50% of what you can get on FM/CW.

If you want to run on AM/SSB you need a A or AB class amp otherwise you will sound like junk .....

 

outer space hillbilly,

i would install the cb and antenna myself but i really need to get a professional shop to install it for me. electronics and i do not mix well what so ever. i learned that out the hard way back in 1992 when i fried the complete wire harness in my 72 chevrolet with my first cobra 25 ltd classic and skip shooter antenna.

 

Well in that case i think you made the right decision to have someone else do it for you.

Unfortunately I can't help you with the Memphis area for having it done.

 

Well, I'm sure that you have heard someone say, "He wrote the book on that subject".

If you can find an old copy of a book called; The Design, Manufacture, Repair, and Matching Of Linear Amplifiers For The CB Industry, Or simply (The Linear Amp Bible) written in 1977 and sold 29,400 copies. you will find this statement in there.

I wrote that book and I have also built in excess of 119,000 LINEAR CLASS "AB" AMPS under my own brand name, Golden Eagle!

Before I go any further, I think that we may be talking oranges and apples.

I DID NOT say that a Linear Amplifier that you are going to use to amplify an AM signal should be Class "C"

Whether you know it or NOT, the output stage of most AM radios are class "C" non-linear. A resistor going from the base of the final to ground is not going to supply a positive bias on the transistor. If you measure the volltage on the base of a silicon bi-polar transistor in such an amplifier, it will be EXACTLY higher than the Emitter voltage by the amount of the voltage dropped across the diode of the emitter base junction-ZERO BIAS!

If a mixer in a receiver is linear and the injection of the oscillator is linear then the mixing process WILL NOT HAPPEN and you will NOT have a superhetrodyne receiver.

In the same manner, if the final of the radio is Class "AB" linear the modulation process--which is the same thing as the mixing process--will not happen.

NON-LINERAIRTY is required for the modulation process to happen!

I agree with that statement 100%. Like I said--apples and oranges. You are describing apples--I am talking oranges. Two different subjects.

However:

YOU STARTED BY TALKING ABOUT RADIOS--NOT AMPLIFIERS. So, the above statement is as I said before
WRONG!!!

The Radio's final SHOULD NOT BE RAN IN IT'S LINEAR REGION.

BTW, I was an amateur extra for over 40 years but my liscense lapsed and I have never renewed--will have to take test again.

Billy Dean Ward

 

"Whether you know it or NOT, the output stage of most AM radios are class "C" non-linear. "

Yes I know that and modulation is applyed to the COLLECTOR ans a small amount to the BASE or the driver collector which allows the stage bias to be class C .....

I have decades of running AM on HF and VHF ....

THIS photo shows one of my last AM stations 150 watts PLATE MODULATED on 6 and 2 meters in 1969 The RF deck ran CLASS C and the plate modulator Class A with 90 watts of output to the plate of the Johnson finals.

I don't run AM except on CB its a dead mode .......


"

 

You may think it is a dead mode and I think it is dying, but a properly fully modulated carrier does sound sweet on the air, As i heard someone say once "real radios glow in the dark"

 

I hear the guys on 75, 40 and 10 meters and with my radios can run AM .

I had untill 8 years ago a 75A2 and HT-37 which I ran on 10 meters and still have a pile of 6 and 2 meter AM radios but no one to talk too ....

I'm not downing AM in fact all my HF radios are filtered to run it as well as CW ...... There is a 6 meter net on 50.400 AM which i try to check into on mondays and fridays but they have hear me only once this year.

I still have some of the boatankers but with my new station they don't get used much anymore.

 

OK what was the FCC certification number on your amps ?

And What code speed did you take your extra call at ? Also where did you take it ( AES, LOCAL CLUB ECT )

 

I found a photo of my 75a2 and ELDCO transmitter ( mid 1980's )