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361. Re: Topband: Length of Beverages (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Mon, 28 Jul 2014 11:42:53 -0500
Hi Jim, As we move the turns closer, we increase the velocity factor too much. At some point, the Slinky will receive off the opposite (feed) end. Tom explains it at www.w8ji.com/slinky_and_loaded_be
/archives//html/Topband/2014-07/msg00065.html (9,889 bytes)

362. Re: Topband: Rig Comparisons (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Sun, 3 Aug 2014 17:33:02 -0500
The Elecraft K3 is an SDR? I never heard that. Are you certain? I'm still trying to sell or trade my Collins S-Line for a K3, regardless. If the K3 is actually an SDR, that would be a plus. 73, Mike
/archives//html/Topband/2014-08/msg00019.html (8,511 bytes)

363. Re: Topband: Ferrite Cores (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Mon, 4 Aug 2014 19:55:58 -0500
I haven't bought a thing from Amidon after reading a few bad experiences on qrz.com. Here's one: forums.qrz.com/showthread.php?240056-Need-source-for-Cushcraft-R5-torroids forums.qrz.com/showthread.p
/archives//html/Topband/2014-08/msg00027.html (7,457 bytes)

364. Re: Topband: Ferrite Cores (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Tue, 5 Aug 2014 13:36:25 -0500
Those were the SAME Amidon cores that Greg, W9GB said were crumbly, cheap Chinese junk and completely unusable. See my previous post. 73, Mike www.w0btu.com _________________ Topband Reflector Archiv
/archives//html/Topband/2014-08/msg00036.html (9,227 bytes)

365. Re: Topband: Ferrite Cores (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Tue, 5 Aug 2014 14:00:48 -0500
It's certainly possible. You can read what he said and see photos at http://forums.qrz.com/showthread.php?240056-Need-source-for-Cushcraft-R5-torroids&p=1882177#post1882177 73, Mike www.w0btu.com ___
/archives//html/Topband/2014-08/msg00041.html (10,067 bytes)

366. Re: Topband: Ferrite Cores (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Thu, 7 Aug 2014 13:37:24 -0500
first. I'll have to study that a little closer sometime. :-) 73, Mike www.w0btu.com _________________ Topband Reflector Archives - http://www.contesting.com/_topband
/archives//html/Topband/2014-08/msg00065.html (10,346 bytes)

367. Re: Topband: Modeling the proverbial "vertical on a beach" (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Thu, 14 Aug 2014 19:22:29 -0500
FWIW, here's a site where someone apparently did some tests. Someone posted it on eHam the other day in a similar discussion. http://www.k2kw.com/verticals/verticalinfo.htm 73, Mike www.w0btu.com ___
/archives//html/Topband/2014-08/msg00130.html (11,539 bytes)

368. Re: Topband: Skimmer calibration (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Tue, 19 Aug 2014 04:33:33 -0500
When I last investigated, all the skimmers and Web SDRs that were outside of North America all had terrible receive antennas for copying DX signals on 160. (And who knows how many of them are in quie
/archives//html/Topband/2014-08/msg00185.html (10,202 bytes)

369. Topband: Anyone using WSPR or WSPR-X? (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Mon, 1 Sep 2014 05:43:48 -0500
Is anyone using WSPR or WSPR-X on 160m? It just caught my attention. Looks like a great tool to see if any DX paths are open, and motivate one to call CQ DX when they are. WSPR home page: http://www.
/archives//html/Topband/2014-09/msg00000.html (6,586 bytes)

370. Re: Topband: Anyone using WSPR or WSPR-X? (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Mon, 1 Sep 2014 13:00:27 -0500
Thanks for the input. I have WSPR 2.12 installed and working on 30 meters in RX-only mode. I see it's uploading my spots to wsprnet.org. If all goes well, tonight I'll switch to 160. 73, Mike www.w0b
/archives//html/Topband/2014-09/msg00008.html (8,136 bytes)

371. Re: Topband: Anyone using WSPR or WSPR-X? (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Mon, 1 Sep 2014 14:07:09 -0500
How well does WSPR work when the band is full of static crashes? If so, is 100 watts too much with 20 over 9 QRN? Just trying to learn. I have it working both RX and TX (5W) on 30 meters right now. :
/archives//html/Topband/2014-09/msg00010.html (8,744 bytes)

372. Re: Topband: Anyone using WSPR or WSPR-X? (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Tue, 2 Sep 2014 09:13:22 -0500
Thanks for all the additional advice, Gentlemen. I understand about audio levels, filtering, etc. :-) My sound card (old Creative labs unit, IIRC) interface is just a couple of audio transformers rem
/archives//html/Topband/2014-09/msg00017.html (9,228 bytes)

373. Re: Topband: Anyone using WSPR or WSPR-X? (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Wed, 3 Sep 2014 04:39:44 -0500
Yesterday I decoded a Chinese station on 30m WSPR, at a level of -28. From http://wsprnet.org/drupal/wsprnet/spots: 2014-09-02 21:34 BZ1UIF 10.140268 -28 0 ND81 5 W0BTU EM37 17566 158 According to so
/archives//html/Topband/2014-09/msg00038.html (9,325 bytes)

374. Re: Topband: Anyone using WSPR or WSPR-X? (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Fri, 12 Sep 2014 18:26:31 -0500
You might be interested in this post, Jim: http://owenduffy.net/blog/?p=2501 "... The Signalink USB turned out to be a disappointment for several reasons but the main one was that the noise floor was
/archives//html/Topband/2014-09/msg00084.html (9,783 bytes)

375. Re: Topband: 160 GP Choke (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Mon, 29 Sep 2014 16:31:22 -0500
Bill, Photos of the common-mode choke at the base of mine ( http://www.w0btu.com/160_meters.html#inv-l_antenna) are at http://www.w0btu.com/files/antenna/160m_inv-L It's 6 turns of F-6 coax through f
/archives//html/Topband/2014-09/msg00167.html (7,348 bytes)

376. Re: Topband: 160 GP Choke (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Mon, 29 Sep 2014 21:00:23 -0500
o.d. #31 toroidal cores." Looks like it could stand one more core and one more turn, if I only used it on 160 and 80. 73, Mike www.w0btu.com _________________ Topband Reflector Archives - http://www
/archives//html/Topband/2014-09/msg00169.html (8,076 bytes)

377. Re: Topband: 160 GP Choke (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Fri, 3 Oct 2014 02:58:42 -0500
That is the design that I was originally going to use, except that I would change it slightly because I use all 75 ohm coax. Anyway, what is the advantage over one made with coax? Better bandwidth, I
/archives//html/Topband/2014-10/msg00004.html (7,785 bytes)

378. Re: Topband: 160 GP Choke (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Mon, 6 Oct 2014 04:38:01 -0500
And --as I remembered a few milliseconds after I replied-- only ONE core. 73, Mike www.w0btu.com _________________ Topband Reflector Archives - http://www.contesting.com/_topband
/archives//html/Topband/2014-10/msg00009.html (7,921 bytes)

379. Re: Topband: TX relays (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Thu, 9 Oct 2014 05:19:01 -0500
This relay looks exactly what I was looking for to remote-switch my 160m inverted-L to other bands, because it will withstand a lot of voltage. From the PDF: High insulation Insulation distance (betw
/archives//html/Topband/2014-10/msg00029.html (7,697 bytes)

380. Re: Topband: TX relays (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Thu, 9 Oct 2014 10:50:57 -0500
Thanks for the advice. I've already calculated the voltage at the feedpoint of my 160m inverted-L on 80m at 1500w (using EZNEC), and it's only a little over 3 kV. I just popped the cover off a little
/archives//html/Topband/2014-10/msg00036.html (9,677 bytes)

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