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61. Re: [TenTec] Omni VI Mystery (score: 1): Author: Barry N1EU <barry.n1eu@gmail.com>; Date: Wed, 30 Jul 2014 13:33:41 +0000; Why does a BFO oscillator need 0.1Hz accuracy? Barry N1EU _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec; /archives//html/TenTec/2014-07/msg00887.html (17,083 bytes)
62. Re: [TenTec] Omni VI Mystery (score: 1): Author: Barry N1EU <barry.n1eu@gmail.com>; Date: Wed, 30 Jul 2014 13:42:16 +0000; Sorry, in my book 1hz accuracy is fine and folks should be encouraged to do it themselves if they're somewhat capable. Besides, with component heating and tolerances, you're simply not going to get 0; /archives//html/TenTec/2014-07/msg00888.html (18,244 bytes)
63. Re: [TenTec] Omni VI Mystery (score: 1): Author: Jim Allen <jim.allen@longhornband.net>; Date: Wed, 30 Jul 2014 09:15:00 -0500; I can't imagine this is a problem affecting all Omni VIs. It's been out there long enough and there are so many CW ops using them for so long that hell would have been raised by now. As fastidious as; /archives//html/TenTec/2014-07/msg00889.html (10,074 bytes)
64. Re: [TenTec] Omni VI Mystery (score: 1): Author: "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>; Date: Wed, 30 Jul 2014 09:27:17 -0500; The frequency has to be resolved to 1 Hz or better per Ten-Tec info. This BFO along with the HF osc and VFO all have a relationship with regard to the final frequency received or transmitted. Any err; /archives//html/TenTec/2014-07/msg00890.html (18,601 bytes)
65. Re: [TenTec] Omni VI Mystery (score: 1): Author: Jim Allen <jim.allen@longhornband.net>; Date: Wed, 30 Jul 2014 09:38:46 -0500; What kind of frequency counter does that? 73 de W6OGC Jim Allen _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/; /archives//html/TenTec/2014-07/msg00891.html (8,973 bytes)
66. Re: [TenTec] Omni VI Mystery (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Wed, 30 Jul 2014 16:02:26 +0100; Let's keep this in proportion, folks! From Jim's description of the symptoms, it seems likely there's a fault - which TT didn't spot - which stops the BFO being shifted on CW Tx; if that's the case i; /archives//html/TenTec/2014-07/msg00896.html (9,351 bytes)
67. Re: [TenTec] Omni VI Mystery (score: 1): Author: "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>; Date: Wed, 30 Jul 2014 10:08:19 -0500; I use a Stamford Research SR-620 with a GPS Discipline oscillator for a reference. However, many less expensive counters will resolve to 0.1 Hz or better. This is the key when one needs to determine; /archives//html/TenTec/2014-07/msg00897.html (11,210 bytes)
68. Re: [TenTec] Omni VI Mystery (score: 1): Author: K8JHR <jrichards@k8jhr.com>; Date: Wed, 30 Jul 2014 13:22:14 -0400; Hi Jim... I once had a problem with a 2m rig once. I enlisted the assistance of a local Elmer who had me open it on his work bench, while he looked over my shoulder and walked me through the process; /archives//html/TenTec/2014-07/msg00905.html (9,815 bytes)
69. Re: [TenTec] Omni VI Mystery (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Wed, 30 Jul 2014 19:01:23 +0100; Jim, Try this simple experiment if you have a receiver that will cover 9MHz: 1) Take the top cover off the Omni (4 screws) 2) Place a piece of hook-up wire into the receiver's antenna socket and drap; /archives//html/TenTec/2014-07/msg00907.html (9,636 bytes)
70. Re: [TenTec] Omni VI Mystery (score: 1): Author: Mike Bryce <prosolar@sssnet.com>; Date: Wed, 30 Jul 2014 14:04:58 -0400; Gang, Ive been sitting on the side on this one. Like bob said, you need a good counter, not a hamfest special. But all this talk about counters and calibration down to a single Hz, I doubt that the s; /archives//html/TenTec/2014-07/msg00908.html (9,392 bytes)
71. Re: [TenTec] Omni VI Mystery (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Wed, 30 Jul 2014 20:23:14 +0100; Jim's getting RF out OK - it's just on the wrong frequency! All the symptons - including the fact that he can "artificially" compensate using XIT - points to the BFO not being pulled to the correct f; /archives//html/TenTec/2014-07/msg00910.html (10,066 bytes)
72. Re: [TenTec] Omni VI Mystery (score: 1): Author: Jim Allen <jim.allen@longhornband.net>; Date: Wed, 30 Jul 2014 15:07:58 -0500; Fascinating! I am here out in the shack with the radios, and have performed the test you outlined. I tuned the 706 with a pick up lead to 9.000.040 to hear the Omni BFO, It was not heard with the 706; /archives//html/TenTec/2014-07/msg00912.html (11,889 bytes)
73. Re: [TenTec] Omni VI Mystery (score: 1): Author: Jim Allen <jim.allen@longhornband.net>; Date: Wed, 30 Jul 2014 16:08:29 -0500; It occurred to me while restoring the gear to operational use that I neglected to set the sidetone in the Omni VI+ back to 700 Hz before I did the test with it. I had lowered the frequency of the sid; /archives//html/TenTec/2014-07/msg00917.html (13,136 bytes)
74. Re: [TenTec] Omni VI Mystery (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Wed, 30 Jul 2014 22:32:57 +0100; Jim, The VI+ results look close to what you would expect, but the VI shift is far too small and confirms this is where the fault lies. The only thing that surprised me is that you couldn't hear the V; /archives//html/TenTec/2014-07/msg00918.html (12,472 bytes)
75. Re: [TenTec] Omni VI Mystery (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Wed, 30 Jul 2014 22:38:04 +0100; Jim, By "listening in" directly to the BFO signals at 9MHz you are independent of all the sidetone and XIT offset processing that goes on in the microprocessor. The BFO oscillator is completely free-; /archives//html/TenTec/2014-07/msg00921.html (10,028 bytes)
76. Re: [TenTec] Omni VI Mystery (score: 1): Author: Jim Allen <jim.allen@longhornband.net>; Date: Wed, 30 Jul 2014 17:07:16 -0500; That makes sense because adjusting the sidetone during the test did not change anything, as I think about it. I'll have a go at your further suggestions tomorrow. It is good to have the VI+ to compar; /archives//html/TenTec/2014-07/msg00922.html (11,567 bytes)
77. Re: [TenTec] Omni VI Mystery (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Thu, 31 Jul 2014 15:07:01 +0100; The attached document may help understand the OmniVI mixing scheme a bit better: http://www.karinya.net/g3txq/temp/omni_mix.pdf Note that - ignoring the RTTY mode - the BFO is only ever on one of thr; /archives//html/TenTec/2014-07/msg00928.html (11,507 bytes)
78. [TenTec] Omni VI Mystery (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Sat, 02 Aug 2014 13:30:37 +0100; Ever since I got my OmniVI I've been annoyed by a low level heterodyne whose pitch is independent of the main tuning but which changes rapidly with the PBT setting. There was some discussion of it on; /archives//html/TenTec/2014-08/msg00040.html (9,912 bytes)
79. Re: [TenTec] Omni VI Mystery (score: 1): Author: "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>; Date: Sat, 2 Aug 2014 08:44:47 -0500; That is one source of the many birdies that is typically found in the Omni VI and Omni VI Plus series. As one that used the radio on 10M as the IF for my EME equipment, the birdies at or near the noi; /archives//html/TenTec/2014-08/msg00042.html (11,580 bytes)

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