NJDTechnologies

Radio: it's not just a hobby, it's a way of life

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MF/LF Operating: Life Below the AM Broadcast Band – column references and bonus material

July, 2017 footnotes

  1. http://www.antennasbyn6lf.com/2017/02/lf-mf-antenna-notes.html

  2. http://w5jgv.com/insulators/insulators.htm

  3. http://njdtechnologies.net/wp-content/uploads/2017/04/Bill-Ashlock-loops-CQ-July-2017.pdf

  4. http://www.w1tag.com/XESANT

Bonus content for July, 2017

Very good construction details for variometer loading by John Molnar, WA3ETD / WG2XKA: https://wg2xka.wordpress.com/the-variometer/

The 8-foot tall vertical was real: http://njdtechnologies.net/wp-content/uploads/2015/04/full-102-whip-setup.jpg

Here are the WSPR results over night using the 8-foot tall vertical overnight at 100W TPO (a few mW ERP?) in January 2014:

 

 

G5RV fed as a Marconi-T vertical – note that the ladder line section, which is the vertical radiator, was carefully separated from branches of the pecan tree and since it was Winter, there was no foliage with which to contend:

 

G5RV Marconi-T vertical loading with a variometer – just three short radials, a ground rod and pretty good ground conditions in North Texas:

 

 

Upper section of a pretty good helically wound 16-foot fiberglass fishing pole that could benefit greatly from a little top loading.

In fact all of these short antennas can benefit tremendously from top loading wires!

 

 


April, 2017 footnotes

  1. http://njdtechnologies.net/the-ins-and-outs-of-filing-an-application-for-a-part-5-experimental-license-on-630-meters/

  2. http://www.qsl.net/d/dl4yhf/wolf/wolf_info.html

  3. http://abelian.org/ebnaut/

  4. http://ve7sl.blogspot.ca/2015/01/the-low-noise-vertical.html

  5. https://wg2xka.wordpress.com/an-receive-only-vertical/

  6. https://www.dropbox.com/s/mqwpxobqv8gmlak/no3m.pdf?dl=0

  7. http://njdtechnologies.net/the-daytime-surprises-on-630-meters-continue/

  8. http://njdtechnologies.net/091516/

  9. http://njdtechnologies.net/wp-content/uploads/2017/01/VO1NA-CW-PARDT-012417.mp3

 

Bonus content for April, 2017

W1VD’s enlarged K9AY loop with vactrol termination and balanced feedline: http://w1vd.com/k9ay11.pdf

Both receiver and transmitter stability are important when running the very slow visual CW modes. Here is an image of my drifting QRSS60 CW signal at 5 mW ERP during a very low power test with another station.

WG2XIQ QRSS60 CW. Painfully slow and not very stable (courtesy W5EST).

 

WG2XIQ CW on 474.5 kHz in Wisconsin at WH2XHY on a very good night (courtesy WD8DAS):

 

This is an image supplied by KL7L (ex-KL1X) of “AQC” (G3AQC, SK) of the first 137 kHz decode from Europe in Alaska “way back when”:

AQC at KL1X on 137 kHz – First EU -> KL7 reception (courtesy KL7L)

 

WSPR and JT9 are very common on 630- and 2200-meters. This image was supplied a few years back by David, VK2DDI. He was pointing out that the faint signal around 475.620 kHz was most likely me but during this sequence there wasn’t enough signal for a decode.

VK2DDI WSPR and JT9 passband (courtesy VK2DDI)