[TenTec] #218 filter

[John T. Fleming]

Bob,

Thanks for the idea.  I am going to put the 218 in my Orion and use either
CWGet or a PSK31 program and watch the waterfall screen for the noise
pattern.  This should give me a good idea what the filter is doing.

Thanks.

73,
John

-----Original Message-----
From: tentec-bounces at contesting.com [mailto:tentec-bounces at contesting.com]
On Behalf Of Bob Cunnings
Sent: Tuesday, October 03, 2006 2:06 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] #218 filter

Another way, if you have a PC with a soundcard, is to use a spectrum
analyzer program like Spectrogram  to characterize the filter using
band noise as input.

This is the technique used by K2 builders to set up the adjustable IF
filters. I used this approach to find the centering adjustment for the
218 and 217 filters in my Orion (I used a program called Spectrum Lab,
found at http://www.qsl.net/dl4yhf/ ).

Bob NW8L