October, 2017 footnotes
Bonus content for October, 2017
This is the operating manual for the Monitor Sensors 2200-meter transverter which also contains some theory of operation: http://njdtechnologies.net/wp-content/uploads/2017/09/CQ-october-2017-bonus-material-2200m-Manual.pdf
July, 2017 footnotes
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
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 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”:
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.