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Total 9 documents matching your query.

1. [TenTec] DDS VFO as remote VFO? (score: 1): Author: lee berman <w1idz@yahoo.com>; Date: Tue, 21 Apr 2009 09:08:09 -0700 (PDT); I am attempting to correct the thermal drift on my 580 Delta PTO, by using a Direct Digitally Synthesized VFO as a remote VFO. The DDS output is said to be ~500mV P-P (I've not measured it myself).; /archives//html/TenTec/2009-04/msg00274.html (7,212 bytes)
2. Re: [TenTec] DDS VFO as remote VFO? (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Tue, 21 Apr 2009 10:57:11 -0600; Have you checked to see that all the temperature compensation capacitors are soldered to the PC board? I found that to be a problem in a Kenwood that drifted too much. Looking at the PTO schematic fo; /archives//html/TenTec/2009-04/msg00275.html (7,971 bytes)
3. Re: [TenTec] DDS VFO as remote VFO? (score: 1): Author: Bwana Bob <wb2vuf@gti.net>; Date: Tue, 21 Apr 2009 19:50:06 -0400; Lee: The easiest way to fix thermal drift is to change the temperature compensating capacitor in the PTO. This is the cap that is shown as "value selected in production" on the PTO schematic. You wil; /archives//html/TenTec/2009-04/msg00283.html (8,747 bytes)
4. Re: [TenTec] DDS VFO as remote VFO? (score: 1): Author: "JAMES HANLON" <knjhanlon@msn.com>; Date: Wed, 22 Apr 2009 13:57:01 -0600; Bob and Lee, Mouser Electronics lists a line of C0G (NP0) ceramic, radial leaded capacitors in their current catalog. They range in value from 10 pf to 0.022 microfarad. I can give you the part numbe; /archives//html/TenTec/2009-04/msg00297.html (10,428 bytes)
5. Re: [TenTec] DDS VFO as remote VFO? (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Wed, 22 Apr 2009 08:31:18 -0600; NPO caps are not an adequate substitution for N750 caps. NPO are a little unpredictable which way they move, but inductors and cores tend to need a true bit of negative temperature compensation. 73,; /archives//html/TenTec/2009-04/msg00298.html (8,710 bytes)
6. Re: [TenTec] DDS VFO as remote VFO? (score: 1): Author: veast1 <veast1@charter.net>; Date: Wed, 22 Apr 2009 15:38:25 -0700; Lee, I am going down this same road with my back-pack rig. It's an MFJ 40 mtr. SSB rig. The VFO is highly unstable and i am going to substitute a DDS VFO for the analog VFO that is in the rig. The re; /archives//html/TenTec/2009-04/msg00307.html (8,949 bytes)
7. Re: [TenTec] DDS VFO as remote VFO? (score: 1): Author: Bwana Bob <wb2vuf@gti.net>; Date: Fri, 24 Apr 2009 09:54:54 -0400; Hmmm... Would a DDS VFO work in the Scout? 73, Bob WB2VUF _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec; /archives//html/TenTec/2009-04/msg00324.html (9,810 bytes)
8. Re: [TenTec] DDS VFO as remote VFO? (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 24 Apr 2009 15:34:24 +0100; As I understand it, the phase noise performance of a DDS is not as good as a well-designed PTO. Would a better solution be to use a "huff & puff" style stabiliser for the existing PTO? That way you g; /archives//html/TenTec/2009-04/msg00325.html (7,964 bytes)
9. Re: [TenTec] DDS VFO as remote VFO? (score: 1): Author: veast1 <veast1@charter.net>; Date: Fri, 24 Apr 2009 18:34:12 -0700; Steve, I thought about going that route, the stabilizer, and am aware of the phase noise problem, however this is just a portable back pack, emergency rig, and thought i'd try my hand at trying to wo; /archives//html/TenTec/2009-04/msg00327.html (9,055 bytes)

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