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CB Radio Forum - Discussions regarding Citizens Band Radio (CB)

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  #21 (permalink)  
Old 03-13-2012, 6:22 AM
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A good match is a must, also that amp has a switch on the Back ( I think ) for am and ssb ...AM olny for the Cobra 29 and 2===2 1/2 Watts for the radio. A good CB shop can wire in a variaple power knob external to the radio they can use the RF gain knob or squelch if you like so you can adjust from the front of the radio.

Last edited by grogan; 03-13-2012 at 6:23 AM.. Reason: my bad spelling
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Old 12-31-2017, 1:46 AM
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Quote:
Originally Posted by Ricky_Blue View Post
I have a brand new Cobra model 29 LTD mobile CB Radio.
I found a Texas Star 400 watt linear on craigs list, and it's been modified for CB use.
I was wondering if it'll work with the new radio as is?
Someone told me that I needed to have internal adjustments/modifications done before adding a linear to it?
Is this information correct?
And yes, I do realize that linears are illegal

Typically you would "drive" your amp with between 1-2 watts. Radio keys 2 watts and swings to NO MORE THAN 20. This will give you what you are looking for. Over driving the amp is a sure way to POP the pills and the repair isnt cheap. I drive a TX Star 350 with 1.5 watts from a Galaxy 959 at about 85% modulation and get about 425 watts out of it. I supply the amp with a powermax 100 amp DC PS. This is a figure for stations ive installed your results may vary but DO NOT OVER DRIVE THE AMP.
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  #23 (permalink)  
Old 12-31-2017, 8:48 AM
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Very doubtful that Ricky Blue will see your response. The last time he posted was 3-11-2012. Over 5 years ago.
Might help some one else, but .......
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  #24 (permalink)  
Old 01-02-2018, 11:33 AM
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When the band opens up, you hear people pushing power all over the country! This is especially true on channels 6 and 28. Many seem to be getting their amps from a guy named Dave. DaveMade Amps
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Old 01-02-2018, 11:53 AM
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If you have an SDR receiver or something with a spectrum display, look at ch 6 when the skip is in. Some guys will key up and the entire spectrum from about 25.5 to 27.5Mhz looks like a giant modulated noise hump. Once you know they are there you can tune up and down the CB band and still make out much of what they are saying 10 channels away. That's mostly from the junk amplifier's they are running being overdriven by a radio that's got 200% modulation.
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Quote:
Originally Posted by TheSpaceMann View Post
When the band opens up, you hear people pushing power all over the country! This is especially true on channels 6 and 28. Many seem to be getting their amps from a guy named Dave. DaveMade Amps
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Old 01-02-2018, 1:34 PM
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I think the term "slop box" would apply here.
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  #27 (permalink)  
Old 01-07-2018, 7:31 AM
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I can't help but to think how many ham radio guys keep saying the sky is falling while running in circles complaining about the CB Signals. While 80, 40, and 20 don't always sound and look too clean on a spectrum analyzer.

Some CB Signals no drought do have some spectral purity problems, I have never had anyone post the a bad CB or even Ham Radio Signal measurement showing increased bandwidth, over modulation, harmonics, non linearity, parastitics, or other distortions. And a proper explanation of say a spectrum analyzer use and what the signal should look like.

The older ARRL Handbooks show some SSB and AM signals good and bad, but only a few. Also be advised many signals that don't look to good, sound great. Whats that all about???? We could use some technical help here....

Again a great post from PRCGUY, with hands on experience of a real measurement.

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  #28 (permalink)  
Old 01-13-2018, 4:30 PM
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A linear is just that. Class B or better. But even a class C box can be used..and clean with some ttuning The problem is every knucklehead looking at the dost meter swang.
Keeping the radio stock and running a linear with an external high/low pass in line. Keep your negative peaks in reason.
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  #29 (permalink)  
Old 01-14-2018, 12:49 PM
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Quote:
Originally Posted by WouffHong View Post
Why tempt fate??
FYI - this came out recently and reflects increasing actions:
Da Wouff

"ENFORCEMENT: FLORIDA CB OPERATOR ORDERED TO PAY A REDUCED
$450 FINE

The FCC has affirmed a reduced fine of $450 issued to a
Florida C B radio operator based only on his proven
inability to pay a much higher $10,000 Notice of Apparent
Liability to Monetary Forfeiture. In ordering Michael W.
Perry of Cross City to pay the reduced amount, the
commission turned away his claim that he was not using a non-
certified transmitter or an external power amplifier on the
11 meter band.

In its order, the FCC indicated that there was ample
physical evidence in this case and that the $10,000 fine was
being reduced solely based on Perry proving that the fine
would be a financial hardship on him. However it also
cautioned Perry that a party's inability to pay is only one
factor in its forfeiture calculation analysis. The FCC
stated that it has it has previously rejected inability to
pay claims in cases of repeated or otherwise egregious
violations. Therefore, future violations of this kind may
result in significantly higher forfeitures that may not be
reduced due to Perry's financial circumstances.

Perry was given the customary 30 days from the date that the
Forfeiture Order was affirmed to pay the $450. If he fails
to do so the matter could be turned over to the Department
of Justice for collection. (FCC)"
**
It's amazing that they reduced the fine that much. "Inability to pay"? Funny, 'cause some of these guys spend literally thousands on custom made linear amps and related equipment! This company has a thriving business... DaveMade Amps
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  #30 (permalink)  
Old 01-14-2018, 4:01 PM
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Quote:
Originally Posted by TheSpaceMann View Post
It's amazing that they reduced the fine that much. "Inability to pay"? Funny, 'cause some of these guys spend literally thousands on custom made linear amps and related equipment! This company has a thriving business... DaveMade Amps
Joe (Gun) from Carolina builds a pretty good first generation Dave Made copy.
I have found that most people that get caught, deserve it.
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