Linear Amp Question

[josh.c]

Originally Posted by clantonman1983

are those channels on sideband???

what channels are they? my radio doesn't have a frequency counter.

Yes, they are on sideband-upper sideband, or USB. They are also "extra" channels, not on the Citizen's Band. 27.515 is the high side of channel 9, 27.555 is the high side of channel 12. By "high side" I mean up one notch on your band selector from the CB freq's. So your 979 doesn't go there, unless you've had it modified to have extra channels.

[josh.c]

Originally Posted by josh.c

Yes, they are on sideband-upper sideband, or USB. They are also "extra" channels, not on the Citizen's Band. 27.515 is the high side of channel 9, 27.555 is the high side of channel 12. By "high side" I mean up one notch on your band selector from the CB freq's. So your 979 doesn't go there, unless you've had it modified to have extra channels.

Boy, I'm the slow typer today! That's what I get for posting and looking for a load at the same time...

[walleye]

Originally Posted by josh.c

unless you've had it modified to have extra channels.

I can't believe Gadfly has not shown up on this thread,.......

[kwray]

Originally Posted by walleye

I can't believe Gadfly has not shown up on this thread,.......

Walleye you jerk! You beat me to it!! This here's a thread about them thar lean-yeers an' all them extree channels. And he didn't post......maybe somebody should knock on his door (or at least rattle a stick on the bars of his cage) to make sure he didn't keel over...

[walleye]

lmfao!!!!!!!!!!!!!!!!!!!,........................

[-=PEAKABOO=-]

Originally Posted by groundpounder

If said galaxy is running a legal 4 watts and not clipped, its prolly not bad your correct......a palomar is a mass produced low grade amp (no offense meant to anyone) but it is what it is...the two paired together are know for bleeding over 4, 5, 6 channels or more each way...

Some higher end "competition boxes" that produce cleaner power are X-Force, DaveMade, Skull Cracka, just too name a few but they come with a BIG price tag...I'm sure there are other good comp boxes out there but I've lost touch with that since I don't skip shoot on 'leven meters anymore..I do it legal now !! LOL

If the OP is happy with his setup have fun and enjoy it, he/she doesn't need our approval !!

The real palomar amplifiers were decent amps with a good bias scheme that truly made the class AB. There was however a lot of "copys" of these amplifier and the only think that was copied was the name. As far as the "comp" amps go. These are actually the worst when it comes to splatter. They are a class C design, they are built this way because it is the easiest way to build an amplifier. The problem is that class C should only be used on FM or CW not AM and SSB. They have no filtering on the output of the amplifier as well. Truth be told that is what just about everything on the market is built like today unless you have someone that knows what they are doing custom build you an amplifier. If built correctly it will make a world of difference on how well it works without trashing up everything with in miles. The radio that is ran into will also need to be set up correctly, the modulation needs to be set to not over-modulate.

[-=PEAKABOO=-]

Originally Posted by josh.c

Yep, 27.385 is channel 38. Try this for a brief class description.

Notice that it says class C amps aren't linear and are only suitable for constant envelope signals...Your Palomar is a class AB1. Knowing all this stuff isn't necessary, I just dork out on this stuff sometimes.

Are you still running that skipshooter antenna? I saw you ask a question about changing to a Wilson in another thread. Just curious what your setup is.

Actually the little palomar 225's were class AB drifting into B after a few keys.
That is if it is even a real palomar, most of them just look like palomars.
AB1 and AB2 are used for different bias scenarios on tubes, not pills.

[josh.c]

Originally Posted by -=PEAKABOO=-

Actually the little palomar 225's were class AB drifting into B after a few keys.
That is if it is even a real palomar, most of them just look like palomars.
AB1 and AB2 are used for different bias scenarios on tubes, not pills.

Thanks for that explanation, I obviously only know enough about this stuff to make myself look dumb. Why does it drift toward class B? Does it become less linear as the temperature rises?

[-=PEAKABOO=-]

Originally Posted by josh.c

Thanks for that explanation, I obviously only know enough about this stuff to make myself look dumb. Why does it drift toward class B? Does it become less linear as the temperature rises?

Yes, the transistors "draw" more bias current and the bias voltage sags more due to this. The bias circuit is not a regulated bias circuit, it just uses resistors.

[WA4GCH]

Originally Posted by walleye

I can't believe Gadfly has not shown up on this thread,.......

I will take his place ..... LOL ......

What do you meen EXTRAS ?

He does get a bit carried away .....