[R-390] Blocking capacitor question

[Bill Feldmann]

I'm using a .01 1000V disc ceramic in mine and it work great.  Some fellows 
feel the film type caps are better at audio frequencies but at 455kc I don't 
think it makes any difference.

Bill N6PY

PS: I just installed the after market 2.5kc and 6kc filters in my R-390A and 
they really work fine.  But the insertion loss is a lot lower so to keep the 
carrier meter readings consistent between filters since I still have the 
stock 4kc and 8kc filters, I put a 27K resistor across the input of each of 
the new filters.  I tested the filters with and without the resistors and no 
difference in receiver noise floor or 3rd intermod performance.   I now have 
for filters 2.5kc, 4kc, 6kc and 8kc.  This works out perfect for both AM 
phone under all conditions and SSB.

----- Original Message ----- 
From: "Perry Sandeen" <sandeenpa at yahoo.com>
To: <r-390 at mailman.qth.net>
Sent: Friday, September 29, 2006 7:53 PM
Subject: [R-390] Blocking capacitor question


Assembled Guru's

It is almost universally accepted that the original C553 0.01mf 300 WVDC 20% 
paper should be
replaced with a 600 volt "orange drop" type of film cap.

My question is: can one use a .01 1,000 volt disc ceramic as well or is 
there a "gotcha" that
makes using ceramics an un-good idea?  Thoughts appreciated.

Regards, Perrier


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