On 7/28/2012 7:45 AM, Jim Thomson wrote:
> Date: Fri, 27 Jul 2012 10:28:49 -0400
>
> ## in any case, I would suggest tweaking the LOAD control such that the¨PO
> drops 2%. Tune ur amp
> up to say 1550 watts pep out,, THEN increase the loading ( decrease the C of
> the load cap), so the
> PO drops down to 1500 w pep out. ( 3.7% drop) Or tune up to 1600 pep
> out..then tweak load cap
> for 1500w pep out. Then its linear..and will absorb most spikes.
That's pretty much how I run it. Actually I tune for about 2KW into the
dummy load then increase the loading to bring it back to 1500. The amp
will run 2500 pep, but running it like this gets me lots of unasked for
quality signal reports.
>
> ## see my other post on how to get rid of the spikes.
>
> ## Im surprised alpha has not made a list of lousy xcvrs .
As not all rigs of these makes have the problem all they'd have to do is
show one that doesn't and it'd be lawsuit time. Tempting as it is I
don't think they'd dare do it. They should at least warn "some rigs
have a leading edge spike and some have poor IMD at maximum power.
73
Roger (K8RI)
“warranty void if ICOM 775 used” etc.
> That would smarten up the xcvr makers real fast. “ warning, do not use the
> following xcvrs, due to their
> poor IMD. These IMD products will be amplified by your Alpha linear
> amplifier to a much greater level”
>
> later........ Jim VE7RF
>
> Jim VE7RF
>
>
>
> _______________________________________________
> 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
|