- 1. Re: Topband: AAARRRAAGH ##$!@@!! (score: 1)
- Author: "Joshua M. Arritt" <jarritt@vt.edu>
- Date: Tue, 03 Nov 2009 17:17:33 -0500
- Poor RX situations (unsuitable antenna, local QRN, etc) can sometimes render the offending ham unsuspecting, and unaware of his trespasses. It seems a bit out-of-place to stress the importance of "RF
- /archives//html/Topband/2009-11/msg00074.html (8,497 bytes)
- 2. Re: Topband: Beverages (score: 1)
- Author: "Joshua M. Arritt" <jarritt@vt.edu>
- Date: Wed, 14 Jul 2010 15:22:27 -0400
- This inspires me to a (perhaps under-educated) pitch for exploration of a novel antenna: An Adaptive Elevation Angle MEMS Beverage. Seriously, I wonder what challenges would be realized in trying to
- /archives//html/Topband/2010-07/msg00075.html (8,709 bytes)
- 3. Re: Topband: experimenting with inverted L (score: 1)
- Author: "Joshua M. Arritt" <jarritt@vt.edu>
- Date: Wed, 30 Nov 2011 17:17:34 -0500
- If there's no change in VSWR when disconnecting the ground system, that would make me terribly suspicious of the feedline if Eu was my unobtained goal after some time on Topband. 73, - Josh / KF4YLM
- /archives//html/Topband/2011-11/msg00302.html (9,344 bytes)
- 4. Re: Topband: Fishing beacons redux (score: 1)
- Author: "Joshua M. Arritt" <jarritt@vt.edu>
- Date: Mon, 01 Oct 2012 09:44:22 -0400
- ITU Region 3 purportedly (according to the world spectrum chart in the office) allows radiolocation, radionavigation, and fixed and mobile commercial services on a secondary basis to amateur communic
- /archives//html/Topband/2012-10/msg00004.html (9,078 bytes)
- 5. Re: Topband: Blame it on global warming (score: 1)
- Author: "Joshua M. Arritt" <jarritt@vt.edu>
- Date: Mon, 05 Aug 2013 11:05:47 -0400
- Doom/boom politics aside, it seems to be interesting data to examine nonetheless. I'll not dare knock propagation research, so long as it's carried out within good radioscience. Agreed that the claim
- /archives//html/Topband/2013-08/msg00035.html (10,084 bytes)
- 6. Topband: Blame D-Layer effectiveness on the seasons (score: 1)
- Author: "Joshua M. Arritt" <jarritt@vt.edu>
- Date: Mon, 05 Aug 2013 18:44:37 -0400
- Thanks for the link! There's a ton of good stuff in this paper for the 137kHz experimenter, or anyone else who is concerned about the D-Layer. 73, - Josh / KF4YLM http://www.physics.otago.ac.nz/space
- /archives//html/Topband/2013-08/msg00064.html (10,661 bytes)
- 7. Re: Topband: More anecdotal "stories" to cause one to stop and.... (score: 1)
- Author: "Joshua M. Arritt" <jarritt@vt.edu>
- Date: Mon, 09 Sep 2013 13:09:10 -0400
- On 9/9/2013 10:33 AM, James Rodenkirch wrote: Listening to a fella on 80 SSB this morning about his experiences with a vertical 1/4 wave and a horizontal loop on Top Band. He said he had both up and
- /archives//html/Topband/2013-09/msg00123.html (8,877 bytes)
- 8. Re: Topband: AM broadcast tower and 160m dxpedition (score: 1)
- Author: "Joshua M. Arritt" <jarritt@vt.edu>
- Date: Fri, 28 Feb 2014 20:40:41 -0500
- Congrats indeed!! Seconding Rick's comment below -- AM towers make REAL lousy RX antennas. They catch ALL* the front-end-pulverizing noise on 160/80. "Been there, done that..." well, OK, not the dxpe
- /archives//html/Topband/2014-02/msg00478.html (10,251 bytes)
- 9. Re: Topband: Silver solder (score: 1)
- Author: "Joshua M. Arritt" <jarritt@vt.edu>
- Date: Fri, 02 Jan 2015 15:12:05 -0500
- On BC MW AM installations, I use 15% Ag StaySilv bars for brazing radials together, or to a common feed/EQ strap ring at the base of the antenna, or strap running along a center line between two memb
- /archives//html/Topband/2015-01/msg00008.html (10,948 bytes)
- 10. Re: Topband: Ground screen ???? (score: 1)
- Author: "Joshua M. Arritt" <jarritt@vt.edu>
- Date: Wed, 2 Mar 2016 11:02:46 -0500
- Galvanized Fe material is problematic from an R standpoint as well (vs. Cu). This results in a "lossy" ground plane. That condition has real impact the effectiveness of the antenna system, when compa
- /archives//html/Topband/2016-03/msg00025.html (10,517 bytes)
- 11. Re: Topband: Soldering radials? (score: 1)
- Author: Josh Arritt <jarritt@vt.edu>
- Date: Wed, 12 Oct 2016 20:28:38 -0400
- In AM broadcast practice, I'll use 15% brazzing rods and a Oxy-MAPP torch. Some of my older stations have Cu strap in the dirt that is THICK, takes a lot of heat to flow on it. I've melted in two som
- /archives//html/Topband/2016-10/msg00064.html (13,515 bytes)
- 12. Re: Topband: FT8 clutter on the DX Cluster (score: 1)
- Author: Joshua Arritt <jarritt@vt.edu>
- Date: Tue, 12 May 2020 21:26:15 -0400
- The Twitter analogy inspires a thought: suppose it were possible to build algorithmic server-side or client-side filtering for DX cluster data to could parse out spots for which you may not be intere
- /archives//html/Topband/2020-05/msg00058.html (9,919 bytes)
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