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1. [TenTec] OmniVI+ 30M L.O. instability (score: 1): Author: "Jack Mandelman" <modeler@bellsouth.net>; Date: Sat, 30 Aug 2008 20:50:41 -0400; When it is very warm in my shack (~85F) my Omni VI+ has the following problem on 30M only. Every 35 seconds or so the frequency would jump on the order of 10-50Hz for a fraction of a second, and then; /archives//html/TenTec/2008-08/msg00470.html (7,936 bytes)
2. Re: [TenTec] OmniVI+ 30M L.O. instability (score: 1): Author: Ken Brown <ken.d.brown@hawaiiantel.net>; Date: Sat, 30 Aug 2008 15:16:26 -1000; Hi Jack The thirty meter oscillator seems to be the one that takes the longest to get locked when switching to that band, and it the one most likely to drift out of lock as you are describing. Adjust; /archives//html/TenTec/2008-08/msg00471.html (10,286 bytes)
3. Re: [TenTec] OmniVI+ 30M L.O. instability (score: 1): Author: John Huffman <hjohnc@gmail.com>; Date: Sat, 30 Aug 2008 21:18:01 -0400; Jack - Sent mine back to Ten Tec and they replaced the crystal oven with a TCXO. Common replacement. 73 de K1ESE John _______________________________________________ TenTec mailing list TenTec@contes; /archives//html/TenTec/2008-08/msg00472.html (8,908 bytes)
4. Re: [TenTec] OmniVI+ 30M L.O. instability (score: 1): Author: Ken Brown <ken.d.brown@hawaiiantel.net>; Date: Sat, 30 Aug 2008 15:58:06 -1000; The 20 MHz TCXO or crystal oven oscillator is used as the reference oscillator for the VFO PLL system and for all of the band select VCXOs. If the problem is only on one band, it is perhaps possible; /archives//html/TenTec/2008-08/msg00473.html (7,772 bytes)
5. Re: [TenTec] OmniVI+ 30M L.O. instability (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sun, 31 Aug 2008 08:38:06 +0100; Jack, It's a few months since I had the same problem with my Omni VI on 160m. If I remember correctly I was able to unbolt the FM and Driver boards and flip them carefully to one side to get access t; /archives//html/TenTec/2008-08/msg00475.html (10,022 bytes)
6. Re: [TenTec] OmniVI+ 30M L.O. instability (score: 1): Author: "Jack Mandelman" <modeler@bellsouth.net>; Date: Sun, 31 Aug 2008 15:05:34 +0000; Ken, Thanks, I found your earlier post on alignment of the LO coil and made a copy for future reference. Since my problem (so far) happens only under extraordinarily warm temperatures in the shack, I; /archives//html/TenTec/2008-08/msg00480.html (11,835 bytes)
7. Re: [TenTec] OmniVI+ 30M L.O. instability (score: 1): Author: "Jack Mandelman" <modeler@bellsouth.net>; Date: Sun, 31 Aug 2008 11:09:22 -0400; Steve, Thank you for the info on how you accessed the LO coils. I made a copy for future reference. Since my problem occurs (so far) only when it's extraordinarily warm in the shack, I'm postponing a; /archives//html/TenTec/2008-08/msg00481.html (9,010 bytes)
8. Re: [TenTec] OmniVI+ 30M L.O. instability (score: 1): Author: Ken Brown <ken.d.brown@hawaiiantel.net>; Date: Sun, 31 Aug 2008 07:41:25 -1000; Oops, I left out the word "not". _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec; /archives//html/TenTec/2008-08/msg00486.html (8,175 bytes)
9. Re: [TenTec] OmniVI+ 30M L.O. instability (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Wed, 03 Sep 2008 13:32:04 +0100; Jack, That's interesting. My 160m problem only showed up when the ambient temperature in the shack was high! Whilst fault-finding I used "freeze it" spray, and a hair-drier, to try to invoke the symp; /archives//html/TenTec/2008-09/msg00019.html (9,656 bytes)
10. Re: [TenTec] OmniVI+ 30M L.O. instability (score: 1): Author: "Ron Zond" <k3miy@csonline.net>; Date: Wed, 3 Sep 2008 09:07:28 -0400; Hi Steve and Others I have am Omni V that dies if the ambient temperature goes above 25 C (77 F). Mine dies on all bands. It dies on the low end first and moves up the band. A further warning of trou; /archives//html/TenTec/2008-09/msg00021.html (11,170 bytes)
11. Re: [TenTec] OmniVI+ 30M L.O. instability (score: 1): Author: "Jack Mandelman" <modeler@bellsouth.net>; Date: Wed, 3 Sep 2008 13:27:03 -0400; Steve, One thing that may be worth trying is disconnecting the cable to connector 84 (LO osc output to PLL and control voltage feedback) and tracking the oscillator frequency vs temperature. With 84; /archives//html/TenTec/2008-09/msg00023.html (11,174 bytes)
12. Re: [TenTec] OmniVI+ 30M L.O. instability (score: 1): Author: "Jack Mandelman" <modeler@bellsouth.net>; Date: Wed, 3 Sep 2008 13:34:45 -0400; Ron, Please check the output (scope and freq counter) from the 5.0-5.5MHz PLL. Since it's dropping out on all bands while tuning the 5.0-5.5MHz oscillator, I suspect that you are losing output from t; /archives//html/TenTec/2008-09/msg00024.html (8,081 bytes)

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