NJDTechnologies

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

Typical Operating Schedule

Usually QRV CW most evenings, tuning between 472.5 kHz and 475 kHz with CQ's on or near 474.5 kHz. Occasionally QRV JT9, 474.2 kHz dial + 1000 - 1350 Hz. QRV some mornings starting around 1100z on CW. Sked requests are welcome. All activity is noise and WX permitting

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

January 2018 footnotes

  1. WSJTx software http://tinyurl.com/hg6rnxm
  2. Meinberg NTP http://tinyurl.com/m8jwah2
  3. Dimension4 http://tinyurl.com/btw4s
  4.  MF/LF chat https://tinyurl.com/ydfh5s7z

  5. Reverse Beacon Network http://tinyurl.com/ya6ma5o2

  6. PSKReporter http://tinyurl.com/jdmnxe8

  7. WSPRnet http://tinyurl.com/yz4a449

Bonus content for January 2018

Sounds of weak signal CW on 630 meters through the Fall:

  1. Morning CQ from W0RW
  2. VE7SL calling CQ  on the evening of November 14, 2017
  3. KA7OEI on November 28, 2017
  4. NO3M calling CQ on November 14, 2017

 

Mystery Christmas Hellschreiber message on 630 meters  received by WA3ETD on December 24, 2017:

courtesy WA3ETD

 

First ever 2200-meter JT9 QSO under part 97 rules between K3RWR and K4LY:

courtesy K4LY

 

F5WK JT9 on 630 meters reported by KA1R:

courtesy KA1R

 

NU6O JT9 QSO on 630-meters with VK4YB:

courtesy NU6O

 


October, 2017 footnotes

  1. <https://tinyurl.com/MF->
  2. <https://tinyurl.com/Monitor->
  3. <http://hanssummers.com/u3kit.>
  4. <https://tinyurl.com/GW3UEP>
  5. <http://tinyurl.com/mteyra8>
  6. <http://tinyurl.com/y98x8sxa>
  7. <https://tinyurl.com/amp-mod->
  8. <https://tinyurl.com/EIRP->

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

  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)