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1. [AMPS] 80/40 antenna back up (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Thu, 1 Feb 2001 13:08:47 -0500; For us new kids, what is this super antenna? A full-size three-element wire Yagi up 135 feet? :-) -Chuck W1HIS -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Admin; /archives//html/Amps/2001-02/msg00030.html (7,423 bytes)
2. [AMPS] 80/40 antenna back up (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Thu, 1 Feb 2001 15:27:52 -0500; I look forward to reading your paper. Seriously. I've spent a lot of time modeling wire antennas with NEC-4, putting them up, and (inadequately) measuring them. I hope you'll include NEC-4 modeling w; /archives//html/Amps/2001-02/msg00034.html (7,993 bytes)
3. [AMPS] WTB:Legal Limit Tuner (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Wed, 7 Feb 2001 17:51:40 -0500; I don't, but as the owner & user of a Heathkit SA-2500, which is the autotuning version of the SA-2060 (and which is not for sale), I'll say that it's an unusually robust tuner. I doubt that many so-; /archives//html/Amps/2001-02/msg00189.html (7,409 bytes)
4. [AMPS] WTB:Legal Limit Tuner (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Wed, 7 Feb 2001 22:32:57 -0500; Phil, I'm e-mailing you off-list ('cuz they're .pdf files) the QST reviews of the two Heathkit tuners (model SA-2060A and SA-2500) that I downloaded from the Members Only product-review pages of the; /archives//html/Amps/2001-02/msg00192.html (11,872 bytes)
5. [AMPS] Big Dentron tuners (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Wed, 7 Feb 2001 22:38:19 -0500; Are the big Dentron tuners (e.g., the MT3000) still made? Available where? -Chuck W1HIS -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amp; /archives//html/Amps/2001-02/msg00193.html (7,058 bytes)
6. [AMPS] Dayton blower motor (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Thu, 15 Feb 2001 18:59:29 -0500; I can't find any sign of an oil hole on the Dayton Mod 4C006B blower motor in my three-months-old Henry amp. What do you make of this? I don't recall seeing a motor this size (1/40 HP, IIRC) without; /archives//html/Amps/2001-02/msg00242.html (6,809 bytes)
7. [AMPS] SB-220 High input SWR and transceiver fold back (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Thu, 22 Feb 2001 17:00:25 -0500; 1. The "SWR monitoring" circuit in the Yaesu transceiver, like the one in my Icom transceiver, almost certainly does not function as intended when the load is nonlinear -- as the input to a G-G amp i; /archives//html/Amps/2001-02/msg00303.html (9,801 bytes)
8. [AMPS] SB-220 High input SWR and transceiver fold back (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Fri, 23 Feb 2001 13:06:09 -0500; But what's the Q of that tuned input? If it's of the order of 2, then an antenna tuner still might help, by providing a significantly higher Q, so that the transceiver saw something nearer to an ohmi; /archives//html/Amps/2001-02/msg00311.html (8,805 bytes)
9. [AMPS] Re: SB-220 Tuned Input (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Fri, 23 Feb 2001 15:26:51 -0500; Thanks. Reading it I just learned that the SB-220's input-circuit Q is about one (1). [_!_] No wonder a transistor rig doesn't like driving it. An antenna tuner in the line should help. -Chuck W1HIS; /archives//html/Amps/2001-02/msg00313.html (6,842 bytes)
10. [AMPS] Re:WTB FIL XFMR (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Sun, 28 Jan 2001 18:42:38 -0500; True but incomplete, therefore confusing or misleading. If you want to get much power out of your amp you must reduce the negative grid bias (or perhaps with some tubes bias the grid slightly positiv; /archives//html/Amps/2001-01/msg00667.html (8,330 bytes)
11. [AMPS] Re:WTB FIL XFMR (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Sun, 28 Jan 2001 21:02:12 -0500; We agree that in Class A, plate current never cuts off; and that in Class AB, plate current cuts off on the decreasing plate-current peaks (which correspond to the decreasing grid-voltage peaks). AB; /archives//html/Amps/2001-01/msg00671.html (8,282 bytes)
12. [AMPS] Fertility (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Wed, 31 Jan 2001 10:23:41 -0500; That's a well-known phenomenon, and problem!, around windmill farms in California. -Chuck W1HIS -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative reque; /archives//html/Amps/2001-01/msg00766.html (8,082 bytes)
13. [AMPS] SWR Protection (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Fri, 1 Dec 2000 13:07:05 -0500; SWR varies extremely rapidly when something in the transmission-line-antenna system arcs over. In a high-power radar that I once used, "SWR" sensing was able to shut off the PA within one microsecond; /archives//html/Amps/2000-12/msg00017.html (8,615 bytes)
14. [AMPS] Low Pass Filter (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Fri, 1 Dec 2000 16:36:02 -0500; Can anyone post quantitative info on this method, e.g., for a given diameter and length tube, packed with how much of what grade steel wool, how many dB of attenuation as a function of frequency? Tn; /archives//html/Amps/2000-12/msg00025.html (7,630 bytes)
15. [AMPS] SWR Protection (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Mon, 4 Dec 2000 08:01:29 -0500; The radar that I mentioned also had a photomultiplier looking down the waveguide. This was Haystack Observatory's planetary radar, which (at the time) put out several hundred kW at 8 GHz, _CW_, by me; /archives//html/Amps/2000-12/msg00061.html (10,082 bytes)
16. [AMPS] ALC (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Mon, 11 Dec 2000 22:41:12 -0500; At the output of my amp. I have an RF Applications peak-indicating wattmeter, which I use to monitor my PEP output in order to stay within the 1500-watt limit. My amp. is a Henry 8-K Ultra, which has; /archives//html/Amps/2000-12/msg00201.html (6,780 bytes)
17. [AMPS] On-off, or leave it on? (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Sun, 24 Dec 2000 11:49:42 -0500; My amp uses an Eimac 3CX3000A7, whose cathode is directly heated. (It's a thoriated-tungsten filament, IIRC.) An often-touted virtue of such a tube is that it requires just a couple of seconds of war; /archives//html/Amps/2000-12/msg00285.html (8,327 bytes)
18. [AMPS] web site for about 1/4 of the amps members... (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Sun, 24 Dec 2000 17:03:32 -0500; I looked at that site. Mostly a pile of ignorant crap. -C. -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Prob; /archives//html/Amps/2000-12/msg00295.html (6,927 bytes)
19. [AMPS] Advice On Homebrewing Chassis Please (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Tue, 26 Dec 2000 14:50:20 -0500; Radio WC6W <wc6w@juno.com> Pem-nuts are neat but I'm inexperienced in metalwork and don't know where to get them and whether I'd need a special tool to install them. Can someone please advise? Tnx &; /archives//html/Amps/2000-12/msg00314.html (8,766 bytes)
20. [AMPS] Alpha (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Fri, 29 Dec 2000 00:49:59 -0500; I understand your sentiment and share it to some extent, but I also think you're being unfair. Life is too short for any of us to learn and do everything. A person must set priorities and make choice; /archives//html/Amps/2000-12/msg00339.html (8,323 bytes)

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