[TenTec] 9MHz 500HZ filter

[Zivney, Terry L.]

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