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Friday, May 25, 2018
Monday, May 7, 2018
H40D IOTA Expedition to Taumako Island, Duff Islands, Temotu IOTA OC-179. From DXNews.com
H40D Duff Islands. Cezar, VE3LYC and Bernhard, DL2GAC/H44MS will be active from Duff Islands, IOTA OC – 179, 29 April – 3 May 2018, as H40D.
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Bill scores a homebrew LW/MW magnetic loop antenna
Many thanks to SWLing Post contributor, Bill Hemphill (WD9EQD) who shares the following:
I went to the Warminster Amateur Radio Club (WARC) hamfest [yesterday] in Bucks County, PA. For some time, I have been thinking about making a loop antenna for AM DXing. It was my lucky day. When I walked to the inside tables, on the very first table was this homemade loop antenna gentleman was selling from an estate.
I snatched it up for $40.
Attached are some photos of it. It’s 25” by 25”, with a swivel base. There are 23 turns of wire and I have no idea what size the capacitor is. I did some preliminary tests and it tunes from 280 kHz to 880 kHz. So it’s the covers the high half of the long wave band and the low half of the AM band.
It’s very well made and I fugue I can modify it to cover the entire AM band.
[…]I hooked the SDRplay RSP2 to it and was getting good signals of major stations all the way to 15 mHz.
That’s with it sitting on my dining room table. Of course the capacitor wouldn’t peak the signals.
So it was a great day at the hamfest!
Indeed that was a great find, Bill! Someone spent a decent amount of time building that furniture-grade loop support. Indeed, it’s very reminiscent of 1920s-30s mediumwave loops!
What I love about your loop (and that of Thomas Cholakov) is that one can see how simple these antennas actually are to build. The only complicated bit is the support, but even that’s simple if you use the shield of a heavy coax or flexible copper tubing.
Thanks for sharing and enjoy logging DX with your new-to-you loop!
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Monday, April 23, 2018
Latest TEC map from NASA. What is TEC? Total Electron Content…
Latest TEC map from NASA. What is TEC? Total Electron Content (or TEC) is an important descriptive quantity for the ionosphere of the Earth. TEC is the total number of free electrons integrated between two points, along a tube of one meter squared cross section, i.e., the electron columnar number density. Affected by solar activity, Total Electron Content (TEC) describes the total number of free electrons present within one square meter between two points (i.e. between the receiver and satellite involved in measuring TEC).
These maps are also used to monitor ionospheric weather, and to nowcast ionospheric storms that often occur responding to activities in solar wind and Earth’s magnetosphere as well as thermosphere.
View live data and images at http://SunSpotWatch.com
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And: Check out the stunning view of our Sun in action, as seen during the last five years with the Solar Dynamics Observatory (SDO):
https://www.youtube.com/watch?v=zXN-MdoGM9g
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BOOK SALE: Space Weather and Sun Science – get these from Amazon, and help us stay online!
NOTICE: When you buy this (or any item after starting with this link), you are helping us keep our SunSpotWatch.com and other resources “on the air” (up and running!). In other words, you are helping the entire community. So, check out this book:
Here is the link to Amazon:
http://g.nw7us.us/fbssw-aSWSC
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See the live aurora mapping is at http://aurora.sunspotwatch.com
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VK5MAV/9 – Cato Reef, OC-265
NEWS UPDATE – Part 1 of the VK5MAV/9 story can be found here FEBRUARY 22 — Permit to stay Cato Reef arrived + expedition website FEBRUARY 8, 2018 — Dates of the expedition have been confirmed today. It will happen from 9th till 18th of April 2018 (of course, if the boat will be OK/no […]
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[UPDATE] XZ2A – Myanmar
NEWS UPDATE – Here’s a photo to show exactly what the generous donations from radio amateurs all over the world have made possible. I’m not spending this money on beer and loose women! The donations to date have allowed me to purchase story-book and English vocabulary picture book sets for 20 orphanages, monastic and ‘needy’ […]
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