[ARC5] Capacitor Types

[Mike Feher]

Mark -

I highly recommend that you use mica or ceramic for the RF sections and the
other types for audio. Orange drops, and most of the wound style capacitors
have a lot of inductance associated with them If you were to see an
equivalent circuit for each it would become obvious. Even in the digital
world, electrolytics and ceramics were usually placed in parallel for
decoupling. The electrolytics to take care of the low frequency stuff and
the ceramics for RF. 73 - Mike 

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960 


-----Original Message-----
From: ARC5 [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Mark K3MSB
Sent: Saturday, January 24, 2015 11:04 AM
To: ARC5
Subject: [ARC5] Capacitor Types

Hi Guys

I have this info squirrled away somewhere but can't find it, so I'll
ask.....

When replacing capacitors I thought it was recommended to use mica for the
RF sections, and for all sections downstream of the IF (towards the audio)
to use orange drops.

Is is advisible to use mica or orange drop type caps for IF stages?  I'm
working on an HQ-129-X and I was planning on using mica for the RF and 1st
IF stages and my supply of orange drops for all the other stages.

I've typically just used orange drops for everything (as I have them "in
stock"), but I'm wondering if it's better to go mica for the RF side of the
house.

Thanks!

Mark K3MSB
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