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Total 13 documents matching your query.

1. [TowerTalk] HP8761A (score: 1): Author: John Kemker <john@kemker.org>; Date: Tue, 26 May 2009 00:39:39 -0400; Looking through my junk box, I found an HP8761A SPDT RF Switch with N Female connectors on all three ports. Has anybody used one of these for antenna switching on a common feedline? I'm not planning; /archives//html/Towertalk/2009-05/msg00478.html (7,219 bytes)
2. Re: [TowerTalk] HP8761A (score: 1): Author: Bob Nielsen <n7xy@clearwire.net>; Date: Tue, 26 May 2009 07:37:55 -0700; You might want to reconsider. That switch is only rated to handle ten watts average power: http://www.helmut-singer.de/pdf/hp8761A_8761B.pdf 73, Bob N7XY _____________________________________________; /archives//html/Towertalk/2009-05/msg00479.html (8,484 bytes)
3. Re: [TowerTalk] HP8761A (score: 1): Author: John Kemker <john@kemker.org>; Date: Tue, 26 May 2009 11:28:56 -0400; Yeah, that's why I'm asking others about it. It's only rated for 10W, but has a 5kW peak? That's an interesting spread. I wonder why the large range between nominal rating and peak rating? -- --JohnK; /archives//html/Towertalk/2009-05/msg00481.html (10,113 bytes)
4. Re: [TowerTalk] HP8761A (score: 1): Author: Bob Nielsen <n7xy@clearwire.net>; Date: Tue, 26 May 2009 09:58:00 -0700; That peak rating is for very low duty factor applications, such as radar, and probably (although they don't specify it) only applies to a very short pulse. Most of the HP components like this were in; /archives//html/Towertalk/2009-05/msg00483.html (11,578 bytes)
5. Re: [TowerTalk] HP8761A (score: 1): Author: John Kemker <john@kemker.org>; Date: Tue, 26 May 2009 13:20:35 -0400; Okay, then it looks like I'll be going with the Tohtsu CZX-3500. I can mount that in a case reasonably easy and feed it with 12 vdc through the rotator cable. JohnK 73 de W5NNH 10X 75371/M&M 117/SMIR; /archives//html/Towertalk/2009-05/msg00484.html (8,530 bytes)
6. Re: [TowerTalk] HP8761A (score: 1): Author: Kevin Normoyle <knormoyle@surfnetusa.com>; Date: Tue, 26 May 2009 10:51:47 -0700; at $110 for a single Tohtsu 3500, is that really a cost saving for this kind of outdoor switching? Just did a quick look, because my remembering of this is that most people who try to do a cheaper ho; /archives//html/Towertalk/2009-05/msg00486.html (8,627 bytes)
7. Re: [TowerTalk] HP8761A (score: 1): Author: John Kemker <john@kemker.org>; Date: Tue, 26 May 2009 16:25:12 -0400; Was trying to avoid the "DC Bias Tee" style, as my lightning protection is DC-blocked (I purchased all my ICE products a few years ago, before the shipping problem). The MFJ two-position switch uses; /archives//html/Towertalk/2009-05/msg00490.html (8,857 bytes)
8. Re: [TowerTalk] HP8761A (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Tue, 26 May 2009 20:31:46 -0700; The average rating is determined by heating. The peak rating is determined by voltage breakdown. _______________________________________________ _______________________________________________ TowerT; /archives//html/Towertalk/2009-05/msg00494.html (7,962 bytes)
9. Re: [TowerTalk] HP8761A (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Tue, 26 May 2009 20:42:40 -0700; Difference between 7500W PEP/ICS (whatever that really means.. what sort of peak/average ratio are they assuming, and what sort of duty factor for that "I"CS) vs 1000W PEP (presumably CW) The Tohtsu; /archives//html/Towertalk/2009-05/msg00495.html (9,826 bytes)
10. Re: [TowerTalk] HP8761A (score: 1): Author: "Roger (K8RI)" <K8RI-on-TowerTalk@tm.net>; Date: Wed, 27 May 2009 00:15:39 -0400; Unless I'm missing something, this would render the peak rating meaningless for almost all amateur use Even SSB at 100 watts PEP is going to be pushing the 10W average unless making short transmissio; /archives//html/Towertalk/2009-05/msg00496.html (8,817 bytes)
11. Re: [TowerTalk] HP8761A (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Wed, 27 May 2009 06:53:28 -0700; You're probably right. There are a variety of non-ham applications where the distinction is important. For instance, maybe you have a system which has some sort of automatic shutdown, which might bur; /archives//html/Towertalk/2009-05/msg00497.html (9,063 bytes)
12. Re: [TowerTalk] HP8761A (score: 1): Author: Bob Nielsen <n7xy@clearwire.net>; Date: Wed, 27 May 2009 09:35:12 -0700; Correct. They definitely weren't aimed at (or priced for!) the amateur market in any case. I used a few of these switches in the 1970s to switch between horizontal and vertical feeds in an antenna te; /archives//html/Towertalk/2009-05/msg00498.html (9,183 bytes)
13. Re: [TowerTalk] HP8761A (score: 1): Author: Michael Tope <W4EF@dellroy.com>; Date: Wed, 27 May 2009 10:52:07 -0700; The 10 W average rating is probably worst-case at 18GHz where according to the data sheet the insertion loss can be as high as 0.8dB. That's equivalent to 1.7 watts dissipation with 10 watts input. I; /archives//html/Towertalk/2009-05/msg00500.html (10,550 bytes)

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