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Re: [IRCA] DT-400W Selectivity
Hi Dennis,
I have a possible selectivity improvement mod planned for the DT-400W
receiver when I get the time. I have purchased some small, 4 kHz @ -6 dB
filters (450 kHz I.F.) that show promise when cascaded in series. I have
some specific values of capacitors, too, that are necessary between the
filters to avoid degrading the total shape factor. The two filters together
are a small enough assembly that they will fit inside the radio easily,
similar to the selectivity mod I made to a DT-200VX (which Richard Allen now
owns).
I only wish there were 450 kHz I.F. filters available of the same quality
that the Murata CFJ455K5 provides. This is the filter Gary DeBock, John
Bryant, and I use in our E100s.
73,
Guy Atkins
Puyallup, WA
www.perseus-sdr.blogspot.com
-----Original Message-----
From: irca-bounces@xxxxxxxxxxxxxxxx [mailto:irca-bounces@xxxxxxxxxxxxxxxx]On
Behalf Of irca-request@xxxxxxxxxxxxxxxx
Sent: Monday, September 08, 2008 10:35 PM
To: irca@xxxxxxxxxxxxxxxx
Subject: IRCA Digest, Vol 53, Issue 36
----------------------------------------------------------------------
Date: Mon, 8 Sep 2008 22:01:50 -0700
From: "Dennis Gibson" <wb6tnb@xxxxxxx>
Subject: [IRCA] My ULR DX Season has Started...2 NEW Ones at
Sunset!!!!
Robert - I've had a DT-400W for a couple of weeks now. As you said it is
extremely sensitive and nulls well but I too am disappointed in the
selectivity. Reasonably strong regionals (as far as 300 miles away)
sometimes spill over into the next frequency. I guess they decided to put
more effort ($$$$) into sensitivity than selectivity.
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