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61. [Amps] Tuned inputs for any GG HF amp. (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Wed, 17 Feb 2010 22:54:56 -0800; donroden at hiwaay.net donroden at hiwaay.net Wed Feb 17 18:19:16 PST 2010 a.. Previous message: [Amps] GS-35B Input -- I think large variations in drive impedence through the rf cycle are somewhat s; /archives//html/Amps/2010-02/msg00514.html (7,921 bytes)
62. [Amps] 2k4-hum, how to check (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Thu, 18 Feb 2010 20:08:43 -0800; very little load, you will have no 120 hz hum. With a full bore dead cxr on CW mode, you will get max ripple [typ2-3%]. cheap RF monitor scope ! You can also see it on the new Array solutions wattme; /archives//html/Amps/2010-02/msg00543.html (8,841 bytes)
63. [Amps] EBM fan (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Fri, 19 Feb 2010 03:15:56 -0800; There is nothing "non-ideal" about this -- it is a perfectly good way to operate a 120V fan from a 240 volt source. Many good power amps are built that way, including some Ten Tec and Alpha models. 7; /archives//html/Amps/2010-02/msg00561.html (8,579 bytes)
64. [Amps] L4/L7 Power supply B+.....'The fix.' (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Fri, 19 Feb 2010 03:53:43 -0800; Hi Ed, What you refer to as bleeder resistors are really part of a voltage divider that provides cutoff bias for the 3-500Zs. There are two 50 kohm x 50 watt resistors in series on the top side of th; /archives//html/Amps/2010-02/msg00562.html (9,359 bytes)
65. [Amps] kw dummy load resistors. (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Fri, 19 Feb 2010 04:56:51 -0800; Two sources of non-inductive high power tubular resistors: Cesiwid, Kanthal-Globar or whatever they are called now (used to be Carborundum Co). They make resistors that are about 300 watts rating, th; /archives//html/Amps/2010-02/msg00563.html (9,082 bytes)
66. [Amps] QRO vs QRP (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Sat, 20 Feb 2010 02:24:14 -0800; The same is true for a noisy band. 160, 75, and 40 are particularly prone to QRN and the warmer the weather the worse it gets. If 75 is open in the evening, thunderstorms from Georgia to Florida, to; /archives//html/Amps/2010-02/msg00581.html (8,999 bytes)
67. [Amps] resonant choke filters. (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Sun, 21 Feb 2010 04:07:51 -0800; "Be careful if you fix this. It's not tuned to *exactly* 120 Hz because that would cause a very high voltage to appear across the choke. Use the specified values if you replace anything." I strongly; /archives//html/Amps/2010-02/msg00601.html (9,085 bytes)
68. [Amps] Hotswitching 30-S1 and MK-V... the fix. (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Sun, 21 Feb 2010 05:12:36 -0800; Hi Folks, I am having a problem with my solid state rig switching to TX and outputing RF quicker than the amp is ready to process it. I have considered taking the key line to an external box that act; /archives//html/Amps/2010-02/msg00602.html (10,115 bytes)
69. [Amps] hotswitching 30s1 (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Sun, 21 Feb 2010 19:31:58 -0800; Key the amplifier and send the PTT signal from it to the transceiver!!! Alex 4Z5KS PTT input, what happens is you have now truncated the 1st 2-18 msecs, or what ever the amps T/R relay's operate time; /archives//html/Amps/2010-02/msg00632.html (8,466 bytes)
70. [Amps] 120 hz hum (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Tue, 23 Feb 2010 05:13:47 -0800; Uhh....Im not complaining about the LK-500 regulation, simply stating a fact. Now if you want to look at the classic Alphas of the 7 series, Ameritron, Ten Tec, Heath, Dentron, Drake, Swan, etc, etc,; /archives//html/Amps/2010-02/msg00682.html (8,990 bytes)
71. [Amps] Speeding up vac relays. (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Tue, 23 Feb 2010 05:34:55 -0800; There is no reason to speed up a vacuum relay. 1.8 mS is more than enough time. Please see: http://home.earthlink.net/~wd7s/updates.htm 73 Jim W7RY procedure. Nobody else gets 1.8 msec with just 26.5; /archives//html/Amps/2010-02/msg00684.html (8,256 bytes)
72. [Amps] henry hum (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Tue, 23 Feb 2010 05:45:25 -0800; the 8 henry filter choke. .1 uf resonating cap changed value, the choke is now de tuned. Jim VE7RF _______________________________________________ Amps mailing list Amps@contesting.com http://lists.; /archives//html/Amps/2010-02/msg00686.html (7,316 bytes)
73. [Amps] GS35B tuned input (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Tue, 23 Feb 2010 06:19:20 -0800; REPLY: I agree and would take it a step further. The higher the Q of the input circuit, the less tendency toward VHF parasitics. Why? A very low Q input circuit will be very broadband and may allow t; /archives//html/Amps/2010-02/msg00687.html (9,306 bytes)
74. [Amps] Step start, is it needed ? (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Tue, 23 Feb 2010 22:08:15 -0800; The SB-1000 does not require a step-start. The transformer is designed so that the secondaries have enough impedance to protect the diodes and tube filament at startup. It also has a relay to protect; /archives//html/Amps/2010-02/msg00711.html (7,825 bytes)
75. [Amps] MK-V and opto isolator/ TX inhibit. /1000-D notes. (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Wed, 24 Feb 2010 02:32:27 -0800; Hey Jim, with regard to what you wrote below a few days ago, I looked in the radio manual and the band data jack pinout as well as the linear connection guff on page 13. As I see it, you have the opt; /archives//html/Amps/2010-02/msg00714.html (10,094 bytes)
76. [Amps] step start .. needed or not ? (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Wed, 24 Feb 2010 04:35:08 -0800; We got around to discovering the why; so subsequent commercial transmitters had the step start added. The inrush current varies. depending upon the magnet memory of the core when it was shut off, and; /archives//html/Amps/2010-02/msg00718.html (9,769 bytes)
77. [Amps] 120 hz hum / energy storage. (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Wed, 24 Feb 2010 05:32:21 -0800; Carl said... REPLY: Maybe, maybe not. Have you considered that with poor regulation, the amp is more likely to "flat-top", and especially so when tuned up with a pulser and then used on voice? We don; /archives//html/Amps/2010-02/msg00719.html (8,315 bytes)
78. [Amps] Step start, easy way to do it. (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Wed, 24 Feb 2010 06:20:41 -0800; Date: Wed, 24 Feb 2010 09:21:39 -0300 From: Felipe Ceglia - PY1NB <felipeceglia2@gmail.com> Subject: Re: [Amps] soft start, how to determine if needed? To: Edward Swynar <gswynar@durham.net> Cc: Amps; /archives//html/Amps/2010-02/msg00720.html (7,961 bytes)
79. [Amps] TX inhibit on MK-V.. it does work! (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Wed, 24 Feb 2010 18:58:50 -0800; I made a cable using the Acom link below but and the QSK worked fine with my Alpha 78 but the TX Inhibit did not 'come on' when I plugged the din in. I had the rig delay set on 20 which seemed to be; /archives//html/Amps/2010-02/msg00734.html (9,849 bytes)
80. [Amps] EBS bi-state or tri-state ? (score: 1): Author: "Jim Thomson" <Jim.thom@telus.net>; Date: Sat, 27 Feb 2010 07:09:17 -0800; Apparently Ameritron amps still use BI-state EBS........ while Alpha .Acom, and now Emtron, all use TRI-state EBS. I tried a HB BI-state EBS scheme a long time ago,, and did not have good success on; /archives//html/Amps/2010-02/msg00752.html (7,569 bytes)

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