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Total 406 documents matching your query.

361. Re: Topband: Thanks! (score: 1)
Author: "ZR" <>
Date: Wed, 22 May 2013 18:31:27 -0400
I have published extensively on this, first in 2005 in a peer reviewed AES paper, and later in my RFI tutorial. All of this work is on my website. W1HIS published his work on this in 2006. A few year
/archives//html/Topband/2013-05/msg00155.html (13,037 bytes)

362. Re: Topband: Magnetic Loops (score: 1)
Author: "ZR" <>
Date: Mon, 27 May 2013 20:53:19 -0400
Your forgetting that the front end is still broadband and wide open and being blasted into intermod many times. These days not everyone is blessed by the latest gigabuck rig which still is wide open
/archives//html/Topband/2013-05/msg00160.html (10,386 bytes)

363. Re: Topband: Shunt fed tower plus Marconi vertical phasing on 160and80? (score: 1)
Author: "ZR" <>
Date: Thu, 30 May 2013 21:06:28 -0400
It is more "cookie cutter" to use series fed quarter wave elements with current feed (95% of people still do that wrong), but if you have a little patience and don't mind experimentation, you could c
/archives//html/Topband/2013-05/msg00168.html (8,982 bytes)

364. Re: Topband: BOG antenna (score: 1)
Author: "ZR" <>
Date: Tue, 11 Jun 2013 22:10:10 -0400
Same here for about 3-4 years now with the first one I tested. OTOH its down quite a bit on the real low angle signals. Experimenting with a 2 wire and maybe some phasing. Carl KM1H Noticed many stor
/archives//html/Topband/2013-06/msg00050.html (8,034 bytes)

365. Re: Topband: My Turn For a Brain Pick - Sanity Check (score: 1)
Author: "ZR" <>
Date: Thu, 13 Jun 2013 09:16:48 -0400
I agree. For me, the primary design objectives are maximizing forward gain, beamwidth, and gain bandwidth. I don't care about F/B. 73, Jim K9YC Ditto as Ive already mentioned as F/R isnt useful to me
/archives//html/Topband/2013-06/msg00051.html (10,047 bytes)

366. Re: Topband: Desktop Power Supply Brand/Noise Question (score: 1)
Author: "ZR" <>
Date: Sun, 21 Jul 2013 21:25:06 -0400
I can't understand why throwing some ferrite beads at a problem, or changing the supply, are the only two solutions. Many times, if not most times, a few .01 uF line voltage rated bypass capacitors a
/archives//html/Topband/2013-07/msg00035.html (13,110 bytes)

367. Re: Topband: Lightning QRN season? (score: 1)
Author: "ZR" <>
Date: Wed, 24 Jul 2013 17:26:27 -0400
I would think that with optimized F/R for your Beverages that at least one path would be somewhat quiet. I was on 160 AM for a few hours last eve and QSO's out to 300-450 miles was good copy with sta
/archives//html/Topband/2013-07/msg00066.html (11,293 bytes)

368. Re: Topband: Topband Inv-L Joy (score: 1)
Author: "ZR" <>
Date: Thu, 25 Jul 2013 11:17:33 -0400
On a side note WD-1A conductors are a copper/cadmium alloy; whatever that means in RF resistance. Fine for a Beverage but what is the loss? Carl KM1H Had a more difficult time getting the antenna up
/archives//html/Topband/2013-07/msg00067.html (8,716 bytes)

369. Re: Topband: 160M Rhombics (score: 1)
Author: "ZR" <>
Date: Fri, 26 Jul 2013 16:23:19 -0400
When I was floating around in the Med for the USN in the early 60's, the bases I visited were all using rhombics pointed at DC mounted on 80-120' wooden poles. These consistently outperformed a 20M 6
/archives//html/Topband/2013-07/msg00110.html (11,844 bytes)

370. Re: Topband: 160M Rhombics (score: 1)
Author: "ZR" <>
Date: Fri, 26 Jul 2013 16:28:36 -0400
That excuse doesnt cut it Mike and from what I was told by those who were there his power would be considered pretty normal these days. You can only get so much out of a pair of 450TL's, 4-1000A's, e
/archives//html/Topband/2013-07/msg00111.html (10,140 bytes)

371. Re: Topband: 160M Rhombics (score: 1)
Author: "ZR" <>
Date: Sat, 27 Jul 2013 10:24:19 -0400
It still boils down to location and propagation. Nobody is King all the time and some hams have real jobs that keep them away during some important openings. Charlie had a very modest and average loc
/archives//html/Topband/2013-07/msg00115.html (12,635 bytes)

372. Re: Topband: Radial wire in bulk (score: 1)
Author: "ZR" <>
Date: Sun, 28 Jul 2013 09:03:45 -0400
Check at the metal recyclers; Teflon insulated wire brings little money as scrap and is rather common where there is high tech and military contractors. Regular tinned copper and stranded PVC insulat
/archives//html/Topband/2013-07/msg00122.html (8,242 bytes)

373. Re: Topband: tree losses (score: 1)
Author: "ZR" <>
Date: Sun, 4 Aug 2013 21:42:16 -0400
I cant think of anyone claiming a tree is resonant on any particular frequency but that doesnt mean it cant be used as an antenna. Anyone disagreeing with that should discuss it with the military who
/archives//html/Topband/2013-08/msg00022.html (9,091 bytes)

374. Re: Topband: tree losses (score: 1)
Author: "ZR" <>
Date: Mon, 5 Aug 2013 12:43:57 -0400
Jim, it seems to be a difficult subject for those who want to make a huge case out of taking measurements as if this was a scientific undertaking requiring a decade of reviews, papers, and the usual
/archives//html/Topband/2013-08/msg00065.html (13,096 bytes)

375. Re: Topband: Effect of trees (score: 1)
Author: "ZR" <>
Date: Tue, 6 Aug 2013 18:53:38 -0400
Its been shown on here and elsewhere, by many and many times, that once beyond a modest radial field the field strength goes up marginally to the classic 128. Ive stressed many times that a mesh scre
/archives//html/Topband/2013-08/msg00088.html (9,163 bytes)

376. Re: Topband: Lightning QRN season? (score: 1)
Author: "ZR" <>
Date: Tue, 13 Aug 2013 16:05:03 -0400
You can always fire up on AM on 1945 Tuesdays at 830PM East Coast time. Get a chance to see how effective all those antennas weve been discussing recently really play. Carl KM
/archives//html/Topband/2013-08/msg00201.html (12,487 bytes)

377. Re: Topband: RX antenna transformer winding (pure resistancetransformation issues) (score: 1)
Author: "ZR" <>
Date: Tue, 20 Aug 2013 17:49:25 -0400
-- Original Message -- From: "Tom W8JI" <> To: "topband" <> Sent: Tuesday, August 20, 2013 4:00 PM Subject: Re: Topband: RX antenna transformer winding (pure resist
/archives//html/Topband/2013-08/msg00243.html (10,549 bytes)

378. Re: Topband: Two 2:1 transformers to choose from!! (score: 1)
Author: "ZR" <>
Date: Thu, 22 Aug 2013 15:02:42 -0400
It pretty much boils down to what frequencies you want to cover. To cover down to the 600M band and below use more turns and to go up to 30 or 20M the 2-3T at 50-75 Ohms does well. I use a VNA and 73
/archives//html/Topband/2013-08/msg00271.html (10,659 bytes)

379. Re: Topband: Best coax for direct burial? (score: 1)
Author: "ZR" <>
Date: Sun, 25 Aug 2013 20:07:01 -0400
Jim You cant get any more reliable than 1/2" Andrew or similar hardline. In this area its free or very cheap and often with connectors as 2 way shops close down and customers keep migrating to cell p
/archives//html/Topband/2013-08/msg00340.html (9,465 bytes)

380. Re: Topband: WD1A wire (score: 1)
Author: "ZR" <>
Date: Wed, 28 Aug 2013 16:26:48 -0400
The last reel I bought was 2.5km for $40 plus about $20 shipping from Ohio about 3-4 years ago on Fleabay. It was listed strangely but I forget how; I believe I searched for "military wire" or someth
/archives//html/Topband/2013-08/msg00353.html (7,731 bytes)

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