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
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