[Amps] AL-1500 pi-network capabilities

[R.Measures]

On Aug 30, 2004, at 9:03 AM, Vic Rosenthal wrote:

> mike kendall wrote:
>
>> I thought Ameritron was using PI-L networks vice PI networks?  If
>> that is the case, doesn't a PI-L network have a more limited matching
>> range than a PI, but much better harmonic suppresion of course.
>> Inside the ham bands, I'm assuming that Ameritron would expect the
>> amp to run into at least a 3:1 VSWR.  If not, why even use tubes and
>> just go solid state with the expectation your VSWR will be flat. R,
>
> My comments about Q apply to PI-L networks as well.  A 3:1 SWR
> represents a very significant change in operating conditions for the
> network.

-  However, even with a 3:1 SWR, the setting of the Tune-C changes 
little -- so the operating change is small.  Most of the change due to 
load SWR is compensated for by adjusting the Load-C.

> My guess is that there are many combinations of
> resistance/reactance giving a 3:1 SWR that would result in excessive
> circulating current in the coils and bandswitch of an AL-1500.
>
> -- 
> 73,
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco
>
>
>
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>
Richard L. Measures, AG6K, 805.386.3734.  www.somis.org