Testing the coil amp and dds in anticipation of experimentation this fall and winter. 8 uW. Unfortunately it is undisciplined so QRG is +- a few ppb until the NE0-7M gps module arrives. 73 Joe VO1NA
Off at ~1600 utc today. The coils did not pass the test and the operator did not find the shorted turns... Joe VO1NA Testing the coil amp and dds in anticipation of experimentation this fall and wint
http://abelian.org/vlf/tmp/170828a.gif That's two daytime signals, 25th and 26th 10:00 to 20:00, combined coherently, bin width is 27.8 uHz. S/N of the combined days is 16.0 dB. Adding the two days n
I didn't think anyone was listening -- many thanks Paul. The module is expected to arrive soon and new halyards are in place. It should be an interesting autumn. 73 Joe VO1NA Testing the coil amp and
Wow! Paul, do these results meet your standard criteria for confirmation? 73, Jim AA5BW http://abelian.org/vlf/tmp/170828a.gif That's two daytime signals, 25th and 26th 10:00 to 20:00, combined coher
Barely. There was some cheating at my end. Because the frequency is not known exactly I had to do some fiddling to add the two days. The fiddle was to rotate the phase to align the phases of the two
Today the aerial was disconnected at 0950 utc as a precaution with lightning in the forecast. The carrier had been on during the solar flare. Good luck on VLF Jack VA7JX. Edge wound coils are expedie
Here's a non-coherent average over 8 days of 10:00 to 20:00 http://abelian.org/vlf/tmp/170907a.gif Impossible to do coherent sum with this many days, without GPS frequency lock. Not bad for 8uW ERP b
This is amazing, Paul. To copy < 0.00001 watts across the pond with the carrier drifting about is an amazing feat. The daytime signal is used because more atmospheric noise is propagated at night? Un
Hi Joe, Just as an inspiration for a VLF coil design, here's an image of the first coil of a stackable set of coils for VLF: http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF/coil1.jpg I just finishe
Hi Stefan, Your sliding bucket VLF coil is making me envious. Markus uses this method as well. I am using the pies configuration and limiting my current to 1/4 amp to prevent high voltage problems. A
Hi Joe, As Jacek told, there are of course several more distributors for that module, not just amazon. Try to find another source and you will have it in a few days. Maybe it will be a bit more expen
