On Oct 30, 2005, at 6:02 AM, Daniel Hileman wrote:
> Hi Everyone,
>
> I am thinking of buying an AL-1200 (as opposed to the 1500, because
> of the
> 3cx1200's great track record)
>
The 3cx1200A7 has more feedback C than a 3-500Z, so much so that
Eimac redesigned it. Of course, for those interested in building a
VHF VFO the A7 is ideal. The redesigned, improved version is the
3cx1200Z7. However, a Z7 is not even close to being interchangeable
with an A7.
. As to the AL-1500, it can be made more stable by adding a low VHF-
Q parasite suppressor at the anode, however, this will reduce the
output on 10m by a couple of %. Also, if one is present, removing
the so-called "neutralization" circuitry improves stability.
> and am getting interested in AM operation, I
> have Kenwood TS-850s which is supposed to be GREAT on AM. One of
> these
> days, I will get a nice Big Boat anchor..but for now the 850 will
> have to
> do. My question is, how much carrier can I safely get out of the
> 1200?? I
> figure my 25 watt carrier from the 850 will NOT drive the amp hard
> on AM,
> but just curious.
>
100w PEP will overdrive a 3cx12007 or an 8877, but it will under-
drive a pair of 3-500Zs. To increase the output of a TS-850S,
operate it at the rated max of 16VDC and adj. the internal ALC
control for what u need. I have been operating my 850 from 16V for
over a year without a problem. With 16V in an 850 should be capable
of 150W out.
> If I had the ability to drive the amp on AM, what would be
> a safe carrier limit out of the amp?
>
80W drives a 3cx1200A7 to full throttle, so an AL-1200 amplifier
should be tuned up for max out with a keyer sending 80w dits at
50wpm. Next, adj. the carrier to 20W and you're ready to make a 10-
minute lock-to-talk transmission on very wonderful A.M..
end
>
> Thanks for all your input,
>
> 73,
>
> Daniel N9WX
>
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|