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61. Re: [TenTec] Ten-tec Triton IV (540 restoration) (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Mon, 12 Oct 2009 10:13:43 -0600; I found a couple years ago that an industrial strength ammonia cleaner from the hardware store was very effective at cleaning tobacco tar off a radio front panel. It helped that this panel had been p; /archives//html/TenTec/2009-10/msg00127.html (8,727 bytes)
62. Re: [TenTec] WTB: 302R Remote Tuning Pod for Omni VII (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Sun, 18 Oct 2009 17:53:50 -0600; There is a simple fix. If there is any surface to the back of the knob, insert a disk of felt and gently squeeze that between the knob and the panel. If one layer of felt won't fill the gap, use more; /archives//html/TenTec/2009-10/msg00186.html (9,069 bytes)
63. Re: [TenTec] Omni VII: RF in TX Audio (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Sun, 25 Oct 2009 09:13:01 -0600; You want a lossy material at the subject frequency, not one used for transformers at the frequency to be filtered. Typically that means a considerably higher permeability for the noise filter toroid; /archives//html/TenTec/2009-10/msg00215.html (7,979 bytes)
64. Re: [TenTec] Omni VII: RF in TX Audio (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Sun, 25 Oct 2009 18:49:51 -0600; Mouser is great to deal with and has a dozen catalog pages of the stuff. If you search on their web page catalog you can download data sheets to help the design. www.mouser.com Amidon is another good; /archives//html/TenTec/2009-10/msg00219.html (8,908 bytes)
65. Re: [TenTec] OMNI-D (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Tue, 27 Oct 2009 22:47:34 -0600; Its a standard problem with crystal filters supplying some delay and audio derived AGC. The simple solution is to back off on the RF gain. Other solutions try to speed up the AGC response and are par; /archives//html/TenTec/2009-10/msg00234.html (7,787 bytes)
66. Re: [TenTec] Ten Tec 962 PS Adjustments (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Sat, 07 Nov 2009 09:23:36 -0600; High SWR does not automatically mean high supply current. It only means high supply current when that high SWR presents a LOW load impedance to the PA transistors. And that impedance is affected by S; /archives//html/TenTec/2009-11/msg00039.html (9,368 bytes)
67. Re: [TenTec] It the 715 speech processor for my Omni C? (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Sun, 15 Nov 2009 17:41:06 -0600; The 715 manual doesn't talk about older rigs. The audio input impedance is sure 47K set by a resistor to ground at the first audio amp input. The EV 606 prefers 250K to 5M according to its spec sheet; /archives//html/TenTec/2009-11/msg00146.html (11,607 bytes)
68. Re: [TenTec] It the 715 speech processor for my Omni C? (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Sun, 15 Nov 2009 18:00:27 -0600; Probably a guitar stereo 1/4" cable will do the output and a simple MC-1 to 1/4" stereo plug cable will handle the microphone side. Likely a standard cable in the guitar shop or RS. I know for certai; /archives//html/TenTec/2009-11/msg00147.html (9,644 bytes)
69. Re: [TenTec] 509 Update (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Mon, 16 Nov 2009 10:43:43 -0600; Testor hobby shop paints mix beautifully. So you can make any color you want from the basic colors. Good paint stores can analyze the existing paint with a computer gadget and mix to match and put th; /archives//html/TenTec/2009-11/msg00155.html (8,453 bytes)
70. Re: [TenTec] Yamaha CM500 Headset (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Mon, 23 Nov 2009 15:56:31 -0600; The best price I found a few months ago was a music store called Sam Ash Music. $44.99 delivered. I spotted the back paper sheet of the package today while moving stuff and it says in bold type: "ELE; /archives//html/TenTec/2009-11/msg00248.html (9,743 bytes)
71. Re: [TenTec] 961 on the left side of rig (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Wed, 25 Nov 2009 10:16:47 -0600; I presume the problem is one of the magnetic field from the power transformer injecting hum into some audio transformer or inductor in the radio. A magnetic shield should help. Either over the sensit; /archives//html/TenTec/2009-11/msg00274.html (8,031 bytes)
72. Re: [TenTec] humm (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Thu, 26 Nov 2009 12:13:51 -0600; Only a warped opinion. Since many a power supply has included the speaker (at least since Collins introduced the 516F-2 in about 1959 with speaker in the power supply cabinet) its been appropriate fo; /archives//html/TenTec/2009-11/msg00309.html (9,672 bytes)
73. Re: [TenTec] Corsair ,help with cw filter! (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Sat, 28 Nov 2009 11:27:56 -0600; I bought a narrow filter for my Corsair II not long after I bought the radio. But I found I could achieve very narrow passbands with the pass band tuning and the stock SSB filters. Perhaps not with a; /archives//html/TenTec/2009-11/msg00341.html (9,269 bytes)
74. Re: [TenTec] Centurion 422 Amp HV - 2800 V S/B 3100??? (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Thu, 03 Dec 2009 16:45:27 -0600; The difference between 2900 and 3100 is 10%. The metering circuit is likely made with 5% parts and power line voltages are allowed 10% variation in most states. 2900 might be a stingy meter or a weak; /archives//html/TenTec/2009-12/msg00015.html (8,060 bytes)
75. Re: [TenTec] Sidetone thump (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Fri, 04 Dec 2009 09:33:07 -0600; I don't know the circuit of the Corsair and I don't recall any such thump in my Corsair II though the sidetone is raspy. The sidetone oscillator is a relaxation oscillator because it starts and stops; /archives//html/TenTec/2009-12/msg00022.html (7,838 bytes)
76. Re: [TenTec] Omni VII Query (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Thu, 10 Dec 2009 18:38:57 -0600; The mismatch range a tuner will handle is very frequency sensitive. Its most restricted at the lowest band from the maximum available capacitance and inductance and often restricted at the highest ba; /archives//html/TenTec/2009-12/msg00088.html (11,232 bytes)
77. Re: [TenTec] Omni VII Query (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Fri, 11 Dec 2009 19:51:48 -0600; That's not really true. But what it does is change the phase angle of the load to sometimes make it easier to match or to feed. The right length can always make a reactive load purely resistive, but; /archives//html/TenTec/2009-12/msg00093.html (9,428 bytes)
78. Re: [TenTec] Omni VII Query (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Sat, 12 Dec 2009 11:27:18 -0600; If the SWR is not 1:1, the impedance is varying as you travel down the line. It can be represented as series or parallel at any point. The change at quarter wave intervals is from inductive to capaci; /archives//html/TenTec/2009-12/msg00098.html (9,278 bytes)
79. Re: [TenTec] Colliins SWR Bridge.....I'm also interested in EWR-PWR instrumentation. (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Sun, 13 Dec 2009 09:30:15 -0600; How you do it with oscilloscopes, I'm not sure. I've heard that low power Birds affect the impedance seen through them. That their coupling is fairly tight and while they may show a matched load, dri; /archives//html/TenTec/2009-12/msg00104.html (8,221 bytes)
80. Re: [TenTec] Colliins SWR Bridge (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>; Date: Sun, 13 Dec 2009 09:40:19 -0600; The problems are that without good directivity, that null may not actually be a match. Poor directivity couples forward power to the reverse power indicator and while there is always a null indicatio; /archives//html/TenTec/2009-12/msg00105.html (9,248 bytes)

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