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21. Re: [TenTec] Century 21 audio hum (score: 1): Author: Josh Gibbs <gibbsjj@xxxxxxxxx>; Date: Tue, 30 May 2017 15:29:11 -0700; It's a bicycle lubricant. Take a look at this page: http://www.tentecwiki.org/doku.php?id=pto I haven't done a PTO (yet!), so I can't say which method is best. I'd be inclined to tear it down so I ca; /archives//html/TenTec/2017-05/msg00162.html (9,291 bytes)
22. Re: [TenTec] Century 21 audio hum (score: 1): Author: "Paul Christensen" <w9ac@xxxxxxxx>; Date: Tue, 30 May 2017 19:39:37 -0400; I'm a firm believer in synthetic grease - but the right synthetic grease. Look for Mobil 1 and Valvoline Synpower products. It's a light, almost fluffy grease with texture much like spackling compoun; /archives//html/TenTec/2017-05/msg00165.html (13,779 bytes)
23. Re: [TenTec] Century 21 audio hum (score: 1): Author: Stuart Rohre <Rohre@xxxxxxxxxxxxxxxx>; Date: Tue, 30 May 2017 18:46:56 -0500; Yes, the symptoms of an open diode are no 0.6 volt across it on diode test function of a DMM, and much higher ripple or strange ripple waveform on scope test. That, on output of the bridge, (+to -) N; /archives//html/TenTec/2017-05/msg00166.html (11,491 bytes)
24. Re: [TenTec] Century 21 audio hum (score: 1): Author: Stuart Rohre <Rohre@xxxxxxxxxxxxxxxx>; Date: Tue, 30 May 2017 19:02:23 -0500; I have high opinion of the Triflow "fix". We have used it at my work, in industrial work for U.S. Navy. Lots easier than flushing grease with solvents, as TF adds needed liquid components back to old; /archives//html/TenTec/2017-05/msg00167.html (9,597 bytes)
25. Re: [TenTec] Century 21 audio hum (score: 1): Author: Stuart Rohre <Rohre@xxxxxxxxxxxxxxxx>; Date: Tue, 30 May 2017 19:12:23 -0500; Thanks Paul, very instructive discourse on lubricants and the need for caution for Triflow to be just used in low pressure situations like the PTO. Complex gear assemblies like old receivers had are; /archives//html/TenTec/2017-05/msg00168.html (8,593 bytes)
26. Re: [TenTec] Century 21 audio hum (score: 1): Author: Jim Brown <k9yc@xxxxxxxxxxxxxxxxxxxxx>; Date: Tue, 30 May 2017 17:43:51 -0700; 8 ohm phones are fairly rare. Most are in the range of 50-600 ohms. Question to the original poster -- is what you hear HUM (pure 60 Hz) or BUZZ (harmonics of 60 Hz)? Hum is most often stray magnetic; /archives//html/TenTec/2017-05/msg00169.html (10,946 bytes)
27. Re: [TenTec] Century 21 audio hum (score: 1): Author: Dukes HiFi <dukeshifi@xxxxxxxxxxx>; Date: Tue, 30 May 2017 20:52:10 -0500; If a diode were to open up, youd still have a bridge, it just would not be refreshed each half cycle so the filtering would not be as effective. This is HIGHLY unlikely. Gary ________________________; /archives//html/TenTec/2017-05/msg00170.html (11,081 bytes)
28. Re: [TenTec] Century 21 audio hum (score: 1): Author: Josh Gibbs <gibbsjj@xxxxxxxxx>; Date: Tue, 30 May 2017 19:32:22 -0700; Hi Jim, I'd say buzz. I tried to record the sound: https://drive.google.com/file/d/0B_pjAwEfeYcdNUpLb3BQdmZnbk0/view?usp=sharing I also tried to look at it on the scope: https://youtu.be/D7mqyUbNhJw; /archives//html/TenTec/2017-05/msg00171.html (12,035 bytes)
29. Re: [TenTec] Century 21 audio hum (score: 1): Author: w8au@xxxxxxxxxx; Date: Wed, 31 May 2017 00:50:25 -0400; Josh: I'm not sure about this T/R switch question. Years ago I used to run my C-21 mobile by backfeeding the 12V Aux socket from the auto's 13.8 V battery. (through fusing, of course) Worked fine. Th; /archives//html/TenTec/2017-05/msg00172.html (9,876 bytes)
30. Re: [TenTec] Century 21 audio hum (score: 1): Author: Josh Gibbs <gibbsjj@xxxxxxxxx>; Date: Tue, 30 May 2017 22:41:45 -0700; Thanks Perry. I've had several people tell me the C21 will run just fine on external 12V. I also found this info on the Ten-Tec DC Circuit Breaker Model 1170: http://www.tentecwiki.org/doku.php?id=11; /archives//html/TenTec/2017-05/msg00173.html (8,860 bytes)
31. Re: [TenTec] Century 21 audio hum (score: 1): Author: Stuart Rohre <Rohre@xxxxxxxxxxxxxxxx>; Date: Wed, 31 May 2017 13:29:47 -0500; Actually, loss of one diode can happen more commonly than we think. The loss of part of the full wave bridge first affects the ripple, and could induce higher hum levels. We have seen it happen in As; /archives//html/TenTec/2017-05/msg00174.html (10,877 bytes)
32. Re: [TenTec] Century 21 audio hum (score: 1): Author: Stuart Rohre <Rohre@xxxxxxxxxxxxxxxx>; Date: Wed, 31 May 2017 13:32:31 -0500; What about insulating both sides of the audio feed to the headphone jack? That way, you eliminate a chassis ground loop at the headphones connector. -Stuart Rohre K5KVH ______________________________; /archives//html/TenTec/2017-05/msg00175.html (9,903 bytes)
33. Re: [TenTec] Century 21 audio hum (score: 1): Author: Jim Brown <k9yc@xxxxxxxxxxxxxxxxxxxxx>; Date: Wed, 31 May 2017 11:54:13 -0700; There is no such thing as a "ground loop." The "buzz" that we often blame on these mythical "ground loops" is really leakage current from the AC power line. There's a complete description of the mech; /archives//html/TenTec/2017-05/msg00176.html (10,626 bytes)
34. [TenTec] Century 21 audio hum (score: 1): Author: Curt Benjamin via TenTec <tentec@xxxxxxxxxxxxxx>; Date: Thu, 1 Jun 2017 19:32:40 +0000 (UTC); Paul, what do you think of Synco Super Lube? It says it's synthetic and contains Teflon and you can get it at Ace Hardware and many car parts stores. I've used it on four PTO's so far. ______________; /archives//html/TenTec/2017-06/msg00002.html (6,785 bytes)
35. [TenTec] Century 21 audio hum (score: 1): Author: Curt Benjamin via TenTec <tentec@contesting.com>; Date: Mon, 19 Jun 2017 12:28:33 +0000 (UTC); Josh, did you ever get a chance to check that bridge rectifier? _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/; /archives//html/TenTec/2017-06/msg00105.html (7,401 bytes)
36. Re: [TenTec] Century 21 audio hum (score: 1): Author: Josh Gibbs <gibbsjj@gmail.com>; Date: Mon, 19 Jun 2017 07:44:16 -0700; Hi Curt, I didn't mess with the bridge rectifier. When I removed the transformer from the chassis, the noise went away. I've made a shield out of steel for the transformer, but have not yet had time; /archives//html/TenTec/2017-06/msg00106.html (8,354 bytes)
37. Re: [TenTec] Century 21 audio hum (score: 1): Author: Jim Brown <k9yc@audiosystemsgroup.com>; Date: Mon, 19 Jun 2017 10:10:40 -0700; Dick is K4XU, and lives in OR, where he's a very active contester. 73, Jim K9YC _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/m; /archives//html/TenTec/2017-06/msg00107.html (8,367 bytes)
38. Re: [TenTec] Century 21 audio hum (score: 1): Author: Josh Gibbs <gibbsjj@gmail.com>; Date: Mon, 19 Jun 2017 10:23:12 -0700; I know, I've been in contact with him. =) I'm planning to have a QSO with him soon. And yes, I will be using my C21 for that QSO! -Josh WA7FPV _______________________________________________ TenTec m; /archives//html/TenTec/2017-06/msg00108.html (8,463 bytes)

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