Separate names with a comma.
Discussion in 'CB and Export Equipment and Accessories' started by Damo666, Feb 13, 2009.
With the amp on or Off?
If on, is the amp biased for SSB (Class B or AB) or is it a Class C amp?
Ok. If the amp has a SSB switch it is probably biased for that mode. I'm kinda with Tony up to this point. Sounds like an RF feedback issue which could be remedied with some proper grounding and a check on how good a ground you have on the antenna install. I had the same issue once in a previous mobile install and the extra grounding took care of the issue.
the audio is perfect on fm and am with the amp, and it's also good on ssb without the amp switched on. I use a 1/2 wave basic vertical. Suggestions as to grounding my system would be appreciated. Would joining a wire from the bracket of my antenna into the garden help do you think? I'm willing to give anything a try to eliminate this problem. Cheers again.
...but I just looked at the schematic for that amp and it looks like a class C amp to me. It's using FETs and I'm not very familiar with amplifier design with them. Perhaps someone else can look at the schematic who is better than me. The SSB switch on the schematic is clearly just switching a capacitor inline with the relay to keep the relay from chattering in SSB mode.
If it's a class C amp, you're going to have this problem on ssb. You still didn't say what radio you're using.
cheers for the reply. I also noticed that all the ssb switch does is switch in a cap. I'm using a Superstar 3900 turned down to 4 watts on fm/4 watts pep on ssb. Can anybody else confirm that this amp is unsuitable by viewing the schematic please? Cheers.
I'm base. I'm running the radio and burner from the same battery. And the power cable is rated at 10 amps. I'm beginning to think that the amp circuitry isn't designed for ssb, even though a ssb switch is on the unit. Have you had a look at the schematic?