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Total 24 documents matching your query.

1. Topband: Waller Flag Question (score: 1): Author: Arthur Delibert <radio75a3@msn.com>; Date: Sun, 6 Sep 2015 13:39:32 -0400; The on-line materials about Waller Flags says that a modest size WF would need about 40 dB of gain to boost the signal to a usable level. One of the postings says that cascading two preamps of 20 dB; /archives//html/Topband/2015-09/msg00011.html (6,816 bytes)
2. Re: Topband: Waller Flag Question (score: 1): Author: "Andrew Ikin" <andrew.ikin@btopenworld.com>; Date: Sun, 6 Sep 2015 19:53:14 +0100; Art Delibert wrote on Set. 6 snip <The on-line materials about Waller Flags says that a modest size WF would need about 40 dB of gain to boost the signal to a usable level. One of the postings says t; /archives//html/Topband/2015-09/msg00012.html (8,539 bytes)
3. Re: Topband: Waller Flag Question (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 6 Sep 2015 14:53:55 -0400; The on-line materials about Waller Flags says that a modest size WF would need about 40 dB of gain to boost the signal to a usable level. One of the postings says that cascading two preamps of 20 dB; /archives//html/Topband/2015-09/msg00013.html (8,844 bytes)
4. Topband: Waller Flag Question (score: 1): Author: "K1FZ-Bruce" <k1fz@myfairpoint.net>; Date: Sun, 06 Sep 2015 16:20:52 -0400; It can be done. JC, N4IS has been doing it and has the DX contacts that most can not hear.. The proof as they say "is in the pudding" He uses balanced twisted pair feed lines with pre-amps, and oth; /archives//html/Topband/2015-09/msg00014.html (9,138 bytes)
5. Re: Topband: Waller Flag Question (score: 1): Author: Arthur Delibert <radio75a3@msn.com>; Date: Sun, 6 Sep 2015 16:53:00 -0400; Tom -- Thanks for the insights. I have no doubt the theory is correct. My sense, though, is that in the denser suburbs, we live in a "fog" of local radio noise, generated by the scores of digital and; /archives//html/Topband/2015-09/msg00016.html (11,866 bytes)
6. Re: Topband: Waller Flag Question (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Sun, 6 Sep 2015 15:55:31 -0500; Maybe his secret is a preamp cooled with liquid helium! ;-) Seriously, there are preamps operating at 70 degrees F (for example) that have less than a 1 dB NF at VHF. They are usually mounted at the; /archives//html/Topband/2015-09/msg00017.html (8,288 bytes)
7. Re: Topband: Waller Flag Question (score: 1): Author: "Andrew Ikin" <andrew.ikin@btopenworld.com>; Date: Sun, 6 Sep 2015 22:52:51 +0100; Bruce wrote on Sept 6. Snip < Check it out http://www.qsl.net/k4fk/presentations/WF-receiver-antennas-SFDXAs.pdf > Bruce, ref to the link above there is a gap in the "History of the Flag Antenna" The; /archives//html/Topband/2015-09/msg00018.html (8,158 bytes)
8. Re: Topband: Waller Flag Question (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 6 Sep 2015 19:31:53 -0400; Thanks for the insights. I have no doubt the theory is correct. My sense, though, is that in the denser suburbs, we live in a "fog" of local radio noise, generated by the scores of digital and other; /archives//html/Topband/2015-09/msg00019.html (9,993 bytes)
9. Re: Topband: Waller Flag Question (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sun, 6 Sep 2015 21:19:56 -0700; The sad thing is that many of us have a score of noise sources in our own homes, and more in the homes that surround us. I have at least that many products that came with SMPS wall warts or equivalen; /archives//html/Topband/2015-09/msg00020.html (9,121 bytes)
10. Re: Topband: Waller Flag Question (score: 1): Author: Nick Hall-Patch <nhp@ieee.org>; Date: Mon, 07 Sep 2015 06:57:28 +0000; And if you look at US Patent 2,247,743, it appears that Harold Beverage conceived of a horizontal Flag around 1941. best wishes, Nick in the "History of the Flag Antenna" The earliest fef. to the Ter; /archives//html/Topband/2015-09/msg00021.html (8,646 bytes)
11. Topband: Waller Flag Question (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 7 Sep 2015 09:55:09 -0400; linear supplies (and some are vintage linear supplies float-charging sealed lead acid batteries. 73, Jim K9YC" Same here. For wall-mounted power supplies, Jameco has an excellent selection of regula; /archives//html/Topband/2015-09/msg00023.html (9,134 bytes)
12. Re: Topband: Waller Flag Question (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Mon, 7 Sep 2015 09:36:58 -0700; I find them at hamfests, typically for a buck apiece. I've also seen suggestions that they can be found at thrift shops. 73, Jim K9YC _________________ Topband Reflector Archives - http://www.contest; /archives//html/Topband/2015-09/msg00024.html (9,410 bytes)
13. Re: Topband: Waller Flag Question (score: 1): Author: "JC" <n4is@comcast.net>; Date: Mon, 7 Sep 2015 13:14:58 -0400; Art I don't know where this coming from ,but the gain you need for a VWF modest size is 20db for vertical polarization and for horizontal HWF you need 40db on 160m, on 80m divide this by 2, you need; /archives//html/Topband/2015-09/msg00026.html (10,819 bytes)
14. Re: Topband: Waller Flag Question (score: 1): Author: "JC" <n4is@comcast.net>; Date: Mon, 7 Sep 2015 13:42:05 -0400; At -140 dBm and 250 Hz noise bandwidth, the system would require a 1 dB noise figure front end. That's about 35 deg K noise temperature. Tom is as usual 100% right, the RX system gain should be near; /archives//html/Topband/2015-09/msg00027.html (10,163 bytes)
15. Re: Topband: Waller Flag Question (score: 1): Author: "JC" <n4is@comcast.net>; Date: Mon, 7 Sep 2015 14:02:58 -0400; Andrew Very interesting, that is my presentation, but my updated early terminated loop reference was from Harold H. Beverage patent applied 1938 and issue 1941 owned by RCA U.S. Patent 2,247,743 Jul; /archives//html/Topband/2015-09/msg00028.html (10,364 bytes)
16. Re: Topband: Waller Flag Question (score: 1): Author: "JC" <n4is@comcast.net>; Date: Mon, 7 Sep 2015 14:26:36 -0400; "" A similar observation was made 20 years ago by Brian Beezley, K6STI, in a QST article titled "A Receiving Antenna that Rejects Local Noise" (September, 1995, page 33): I've been looking around for; /archives//html/Topband/2015-09/msg00029.html (11,316 bytes)
17. Re: Topband: Waller Flag Question (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 7 Sep 2015 21:23:06 -0400; Thank you, JC: I don't know where this coming from ,but the gain you need for a VWF modest size is 20db for vertical polarization and for horizontal HWF you need 40db on 160m, on 80m divide this by 2; /archives//html/Topband/2015-09/msg00034.html (11,642 bytes)
18. Re: Topband: Waller Flag Question (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 8 Sep 2015 10:45:37 -0400; Tom, I'm afraid I disagree but agree with some of that, I am using a 43dB gain preamp since 2010 with not a single failure yet, but I understand your point. It is so delicate to implement that most o; /archives//html/Topband/2015-09/msg00036.html (12,123 bytes)
19. Re: Topband: Waller Flag Question (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Tue, 8 Sep 2015 12:08:30 -0500; There seems to be something that I'm missing in this preamp NF discussion. When I studied preamps and NF ~30 years ago, I thought the NF of the system of the first active device was the all-important; /archives//html/Topband/2015-09/msg00039.html (10,225 bytes)
20. Re: Topband: Waller Flag Question (score: 1): Author: "K1FZ-Bruce" <k1fz@myfairpoint.net>; Date: Tue, 08 Sep 2015 13:47:36 -0400; Above and beyond all the dialogue, JC is making these antennas work. Time after time he is working stations that only a few with large antenna systems copy. 73 Bruce-K1FZ It seems unlikel; /archives//html/Topband/2015-09/msg00040.html (9,552 bytes)

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