[Amps] TITAN II tuning and loading padder capacitors

[Gary Schafer]

If you are near the current limit on the ceramic caps, use multiple smaller
value caps in parallel so the current is less in each.

73
Gary  K4FMX

> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]
> On Behalf Of Bill, W6WRT
> Sent: Monday, December 07, 2009 12:55 AM
> To: amps at contesting.com
> Subject: Re: [Amps] TITAN II tuning and loading padder capacitors
> 
> ORIGINAL MESSAGE:
> 
> On Sun, 6 Dec 2009 14:30:38 -0500, "David J Windisch"
> <davidjw at cinci.rr.com>
> wrote:
> 
> >Are these N750 capacitors suitable as padders in this r-f application?
> 
> REPLY:
> 
> A lot of manufacturers use N750 or similar caps and they do drift. If
> the drift
> isn't excessive, I'd ignore it. Does the power output actually change or
> are you
> seeing just the plate and grid readings changing?
> 
> If you want to fix it , try finding either some NP0 ceramic or
> transmitting-rated mica capacitors. They are hard to find with high
> enough
> current ratings for legal limit amps, and they are expensive if bought
> new.
> Don't be tempted to use the little ones the size of postage stamps
> unless you
> parallel a bunch of them to spread the heat dissipation.
> 
> 73, Bill W6WRT
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