Mail Archive Search: <+from:ccc@space.mit.edu>

Results:

References: [ +from:ccc@space.mit.edu: 57 ]

Total 57 documents matching your query.

41. [AMPS] High-SWR protection (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Sun, 29 Oct 2000 13:12:02 -0500; A few days ago in one of my all-too-frequent mental lapses, I tried to put 200 W of CW RF power into a coax switch while it was set to short the line. There was a nasty, rich, fat, juicy sounding arc; /archives//html/Amps/2000-10/msg00653.html (8,533 bytes)
42. [AMPS] High-SWR protection (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Sun, 29 Oct 2000 21:35:55 -0500; I asked: Thanks to the many who responded, many directly to me, off-list. The winning combination, IMO, is to 1. buy an RF Applications, Inc., VFD Series, directional, peak, wattmeter <http://radioda; /archives//html/Amps/2000-10/msg00666.html (9,379 bytes)
43. [AMPS] High-SWR protection (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Sun, 29 Oct 2000 21:55:02 -0500; Not any _correct_ way. If the load is a short, then the reflected power equals the forward power; the voltage reflection coefficient (Gamma) is minus one; and the current reflection coefficient is pl; /archives//html/Amps/2000-10/msg00667.html (8,654 bytes)
44. [AMPS] High-SWR protection (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Sun, 29 Oct 2000 22:13:21 -0500; At <http://www.radiodan.com/rfapps/vfd.htm> it is stated that the 5-kW version of the VFD is new. I'm sorry to hear this. All I can say is that I also have two Bird wattmeters and an assortment of sl; /archives//html/Amps/2000-10/msg00668.html (9,821 bytes)
45. [AMPS] High-SWR protection (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Mon, 30 Oct 2000 10:43:49 -0500; That sounds right. Thanks. Sorry -- I was guilty of mindlessly parroting the advice on RFApplications' website. Perhaps someone from RFApplications will chime in to enlighten us? Sensible advice. Tha; /archives//html/Amps/2000-10/msg00679.html (9,558 bytes)
46. [AMPS] High-SWR protection (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Tue, 31 Oct 2000 12:12:45 -0500; The VSWR is determined by the (complex) load impedance Zl and the characteristic impedance of the transmission line Zo (which I'll take to be resistive and equal to 50 ohms) as follows. Here, Gamma i; /archives//html/Amps/2000-10/msg00708.html (10,198 bytes)
47. [AMPS] QRO RF remote switches (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Sat, 9 Sep 2000 19:35:45 -0400; I need to switch, _remotely_, parallel-wire feedlines in a multiband HF antenna system. The SWR in these "tuned feeders" is very high on some bands. I calculate that I'll be switching up to 20 A and; /archives//html/Amps/2000-09/msg00378.html (7,095 bytes)
48. [AMPS] Voltage at antenna end. de K0FF (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Mon, 11 Sep 2000 14:08:22 -0400; The voltage isn't infinite, of course. The "fringing-field" capacitance of the end of the wire limits it, and the dielectric polarization of the end insulator reduces it further. I don't know just w; /archives//html/Amps/2000-09/msg00480.html (8,973 bytes)
49. [AMPS] High Voltage at Antenna Ends (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Mon, 11 Sep 2000 16:04:27 -0400; I tried this but the antenna still kept falling down in severe ice storms. Then I thought of burying the wire in the ground. This not only provides the desired loss, but my antenna has also not falle; /archives//html/Amps/2000-09/msg00487.html (7,864 bytes)
50. [AMPS] Voltage at antenna end. (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Mon, 11 Sep 2000 16:19:48 -0400; Yes, but bear in mind that: (1) a trap is generally lossier than an end-insulator, and the equivalent parallel conductance of the trap can load down and reduce the voltage at the hot side of the tra; /archives//html/Amps/2000-09/msg00489.html (8,671 bytes)
51. [AMPS] High Voltage at Antenna Ends (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Mon, 11 Sep 2000 17:40:26 -0400; I used BURY-FLEX(TM) <http://www.davisrf.com/ham1/coax.htm#buryflex>, which I believe was developed especially for such antennas. "Commercial entities are pleased with its tough, high durometer, oute; /archives//html/Amps/2000-09/msg00492.html (8,936 bytes)
52. [AMPS] EVALUATION OF HENRY 2K CLASSIC (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Mon, 11 Sep 2000 19:21:26 -0400; Is this mainly because the variable inductor needs many turns of cranking? Have you seen the spinner knob for sale at <http://radiodan.com/Henry/parts/spinner.htm>? Would that help? -Chuck W1HIS --; /archives//html/Amps/2000-09/msg00496.html (7,505 bytes)
53. [AMPS] EVALUATION OF HENRY 2K CLASSIC [2] (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Mon, 11 Sep 2000 19:29:45 -0400; I don't own stock in Henry (and certainly not in Heath) but I'd like to hear your and others' opinions about why a person might prefer the 120-lb. over the 55-lb. amp. Speaking for myself, starting; /archives//html/Amps/2000-09/msg00497.html (8,002 bytes)
54. [AMPS] 8877 test results. (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Wed, 13 Sep 2000 15:30:34 -0400; Can someone educate me (and others)? I know very little about power grid tubes, although I do know some physics. What's the physical explanation of this rectification effect -- that current flows wh; /archives//html/Amps/2000-09/msg00628.html (8,473 bytes)
55. [AMPS] 8877 test results. (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Wed, 13 Sep 2000 16:55:33 -0400; I'm not arguing; but I need help understanding. I can understand why a field-emission rectifier works; it's because electrons come in just one polarity. (At least, in normal matter, not antimatter :; /archives//html/Amps/2000-09/msg00636.html (8,869 bytes)
56. [AMPS] Amp Pi Network Behavior (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Fri, 15 Sep 2000 14:11:32 -0400; It could be (as you suggest) inductive reactance seen looking into the feedline, but (at least in principle) it could also be a smaller resistive component of the impedance seen looking into the feed; /archives//html/Amps/2000-09/msg00781.html (8,318 bytes)
57. [AMPS] "Care & Feeding of Power Grid Tubes" (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Tue, 19 Sep 2000 17:01:58 -0400; Only a small portion of that book is on the Eimac website. You might try buying a copy of "Care & Feeding..." on eBay. That's where I got mine. 73 de Chuck W1HIS -- FAQ on WWW: http://www.contesting; /archives//html/Amps/2000-09/msg00888.html (7,749 bytes)

Current List: 41 - 57
Page: [1] [2] [3]