Question about Cobra 19 DX III 40-Channels Base CB Radio

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President mckinly ssb/am model with mb8719 pll chip.

Fault finding need help..transmitt carier on am normal 4 watts no modulation on am and no modulation on ssb usb/lsb.receive is alright.checked mic insert -inside mic etc and other end mic plug all ok their.

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Re: president mckinly ssb/am model with mb8719 pll chip.

It looks like you had some loose connections in that CB. you may want to also check for other cold solder joints throughout the units and touch them up with some solder. Might I suggest you use a desoldering tool and then just add new solder to the connection.

Posted on Sep 05, 2007

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Wire 4 pin Turner Plus 3 Power Mic for cb radio to 5 pin President Washington SSB AM Radio

the best i can find is this
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My hr2600 shows error 3 when it is keyed up and does not transmit

0 = Transmitter Timeout timer has timed-out
1 = Transmit Frequency is lower than TX Lockout Lower Limit
2 = Transmit Frequency is greater than TX Lockout Higher Limit
3 = Phase-locked-loop (PLL) won't lock at this transmit frequency
4 = PLL is intermittently coming out of lock during transmit
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How do i adjust the sideband


Connect one end of your coaxial cable to the output port on your SSB Transmitter. Connect the other end of the cable to the coaxial input port on your RF demodulator.

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President what? Madison, Lincoln etc.

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2 Answers

Just want to know if i should use my ll203 amp in am or ssb mode when running with a cobra CB radio?

What radio?? Does it have single side band(SSB)? If not, then don't use SSB.

AM - amplitude modulation
SSB - single side band.

If you have SSB, there would be a switch on it to transmit in SSB. If not, it is AM only.

Second, Has this radio been worked on to be able to run on an amp? If not, you will blow the amp.

A CB radio transmits dead keys with 4 watts of power, and transmits with 4 watts of audio.

a 4 watt dead key is too much for a linear amp. You will smoke the transistors. Also, 4 watts of audio is not enough to drive it properly. You won't get full power.

The dead key needs to be around 2 to 2 -1/2 watts,or what ever makes the linear dead key half its peak wattage., and the modulation (audio) turned up all the way.

It doesn't sound like you know too much about CB radio's. Not a big deal, you can learn. For right now you may want to take it to a cb shop and tell them you want a peak and tune, and set up to run a linear.

You can find CB shops usually at truck stops. Some area's they are other places. Check the internet for local shops.

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Thanks sharcnet i just going through the steps in my head trying to figure out what I would do if it was on my bench ..Between the two of us we'll figure it out!!!..... Dean

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