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1. [TenTec] #218 filter (score: 1): Author: "John T. Fleming" <W3GQJ@earthlink.net>; Date: Tue, 3 Oct 2006 10:08:51 -0400; I have a 218 filter that I took out of my Omni D years ago and replaced it with a new 218. I don't remember if it is off frequency or what is the problem with it. I found it in the junk drawer in the; /archives//html/TenTec/2006-10/msg00063.html (7,715 bytes)
2. Re: [TenTec] #218 filter (score: 1): Author: "J.Reed" <jhreed@chilitech.net>; Date: Tue, 3 Oct 2006 10:56:03 -0400; Good morning John, I'm a bit too dumb to answer the question but I also would be 'interested' in knowing how to test it myself. I have the Orion-1 and maybe could try it out doing the same test as yo; /archives//html/TenTec/2006-10/msg00066.html (8,208 bytes)
3. Re: [TenTec] #218 filter (score: 1): Author: "John T. Fleming" <W3GQJ@earthlink.net>; Date: Tue, 3 Oct 2006 13:09:51 -0400; Jim, I don't know when I replaced the filter in the Omni D. My grandson KD8AUL has the rig now along with the manuals. The invoice would still be in the manual. That is where I file those types of it; /archives//html/TenTec/2006-10/msg00071.html (9,534 bytes)
4. Re: [TenTec] #218 filter (score: 1): Author: Ken Brown <ken.d.brown@hawaiiantel.net>; Date: Tue, 03 Oct 2006 07:21:42 -1000; The easiest way to check a filter (if having the expensive lab equipment is easy) is to sweep it with a spectrum analyzer / tracking generator. If you don't have access to one of those ( not the kind; /archives//html/TenTec/2006-10/msg00072.html (10,982 bytes)
5. Re: [TenTec] #218 filter (score: 1): Author: "Bob Cunnings" <bob.cunnings@gmail.com>; Date: Tue, 3 Oct 2006 12:06:19 -0600; 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; /archives//html/TenTec/2006-10/msg00075.html (12,748 bytes)
6. Re: [TenTec] #218 filter (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Tue, 03 Oct 2006 12:09:14 -0600; Another technique that works is to use spectrum analyzer software on a PC with sound card and let it display the noise spectrum of the received audio with the noise of a dead band at the receiver ant; /archives//html/TenTec/2006-10/msg00076.html (9,587 bytes)
7. Re: [TenTec] #218 filter (score: 1): Author: "John T. Fleming" <W3GQJ@earthlink.net>; Date: Tue, 3 Oct 2006 14:34:46 -0400; 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; /archives//html/TenTec/2006-10/msg00078.html (8,335 bytes)
8. Re: [TenTec] #218 filter (score: 1): Author: "J.Reed" <jhreed@chilitech.net>; Date: Tue, 3 Oct 2006 15:05:10 -0400; John, I'm probably way off base on this but wouldn't CwGet waterfall simply show the DSP bandwidth? Nothing to do with the roofing filter that I can see.... of course, I may be wrong... what do you t; /archives//html/TenTec/2006-10/msg00079.html (9,193 bytes)

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