On Sat, 2007-07-21 at 15:32 -0700, Denton wrote:
> I have an older 220 ten tec L network transmatch I am rebuilding, and I
> notice that ten tec uses high voltage disk ceramic paddling caps in series
> with the main tuning air paddler...
> I notice that under some tuning conditions, the swr will drift and some of
> the ceramic caps will get rather warm, even with barefoot power applied...
> I am wondering if substituting the original ceramic caps with 2nF type caps
> will stabilize the swr drift.
Type COG cuts the drift. 2nF is the value, 2 nano farads, 2000 pf. To
cut the heating pick the physically largest in the catalog (like from
Mouser or Digi-Key). That will get the lowest dielectric constant
ceramic which usually has the lowest RF loss.
--
73, Jerry, K0CQ,
All content copyright Dr. Gerald N. Johnson, electrical engineer
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