New "CB" amplifier.

[KA5PIU]

Hello.

Want an amp that is as "Nasty" as they come?
As you are aware, analog 800MHz equipment is plentiful and cheap right now.
A lot of radios use an output module that is the complete final amplifier.
On all of the ones I have been able to find so far there is no filtering whatsoever, it depends on the signal to be clean and in the designed band.
So, what happens when we input an AM signal at 28MHz in?
Since this is class C, we get distortion, lots of it.
But, unlike the CB amps of old, where the transistors were only good to 30MHz, we get to go all the way up to 800MHz!
So, 28, 56, 84, 112, 140, 168, 196, 224, 252, 280, 308, 336, 364, 392, 420, 448, 476, 504.
My guess is that it keeps on but the older spectrum analyzer only goes to 512Mhz.
This was a sawtooth wave into a dummy load.

[NQ6U]

[NA4BH]

Nothing like promoting illegal activity.

[NQ6U]

Nothing like promoting illegal impossible activity.

Fixed that for you.

[n2ize]

Howw bout a 6 pill Dave Made + a DOSY Meter... :(:)

[N2CHX]

[KB9YCO]

At the risk of stereotyping CB I just have to say, "Four ten, roger, right on, no doubt about it... and I just got down!"

[KA5PIU]

Fixed that for you.

Hello.

Try it sometime.
Mini circuits has a warning about this very thing.
The trouble is that amplifier was never intended to operate without a signal in the frequency range in question.
Look at HF amplifiers, the band filtering solves the problem, if properly tuned.
Take an HF amp and disable the band filtering for a moment and bias it to class C.
Now inject a frequency, prefer AM and over driven,at least 2 octaves below the upper limit.
In effect you have a sawtooth wave.
See what you get.
In effect you are running a CB amplifier.
You can also be lazy and just use a CB amplifier.
Real nasty output.
Now, connect a CB radio, or simulation, to an amplifier that can operate to UHF that has no filtering.
Nasty signal, but it is all over the place.
Again, very easy to disprove. ;)
Remember that the commercial amps are intended for FM service, not AM, so they are class C.
Taking them outside, way outside, the intended passband does not help. ;)
I am actually thinking of mounting an 800Mhz 60 watt final module inside a Texas Star amplifier on the side, adding BNC connectors, and calling it a "Dual use" amp. ;)
I would never operate this thing on the air, but I can sure have fun anyway.
Perhaps I can present this to the ARRL as a project? ;)

[N2CHX]

NOM NOM NOM

[KA5PIU]

NOM NOM NOM

Hello.

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