[TenTec] 9MHz 500HZ filter

[Rick Westerman]

This Roofing Filter subject has me a bit uncertain.

If we insert 6-pole or 8-pole filters instead of 4-pole filters,
we will have more insertion loss - and it is not trivial.
I was thinking about using my filters from my OMNI VI+ too, but I
am afraid there might be too much insertion loss.

Has anybody done any testing with this or already asked TEN-TEC?

73
Rick

-----Original Message-----
From: tentec-bounces at contesting.com
[mailto:tentec-bounces at contesting.com]On Behalf Of Zivney, Terry
L.
Sent: Wednesday, January 14, 2004 10:04 PM
To: tentec at contesting.com
Subject: [TenTec] 9MHz 500HZ filter


I note in my new Orion that the supplied roofing filters have 4 
crystals each, which is sufficient given their intended purpose.
The accessory filters for the Orion, since they are also used in
older Ten-Tec gear, have 6 or 8 crystals, which among other
things
surely increases the cost.

International Radio (www.qth.com/inrad) sells a kit with 4 - 9Mhz
crystals and the necessary capacitors to make a 600Hz filter
with 200 ohms termination impedance, which I believe is the same
impedance as the Ten-Tec filters.  This kit, without a circuit
board, is only $24.  Although a purchaser of a $3,000+ radio
may not wish to cut corners on a $109 filter, owners of older
rigs may.  In particular, given the cascading nature of the
filters
used in the OMNI VI, this may be a way to upgrade for relatively
little cost.

Anyway, it's an idea.

Terry Zivney, N4TZ/9
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