"Michael A. Terrell" wrote:

Dave Holford wrote:

I hear it fine with several different receivers provided I use either CW
or SSB. But! I CANNOT hear it on my IC-706; it does not seem to come
alive until somewhere between 200 and 300kHz.

Dave

Try using a HP312 series Frequency Selective Voltmeter for the
receiver.

Build a 60 KHz tuned loop and look at it with a scope. You can see
the modulation, because it is so slow. It is a CW signal with a 10 dB
gain reduction modulation with a maximum level change of twice per
second. (Normal and -10 dB) I built a three foot square copper loop with
an insulator where it was mounted on a cast aluminum electrical box, and
wound 20 turns of wire inside the 3/4" copper pipe after it was soldered
together. I used an op amp to give some gain,. and I could watch the
modulation. The big problem was a neighbor about a half mile away left a
TV set on 24/7 and the horizontal oscillator drifted after the station
went off, and the harmonics would drift right through 60 KHz. I wanted
to use it for a frequency standard, but I couldn't do it there. I will
try it again, some day, now that I have a couple miles of woods between
me and Colorado. I have enough gain to get around 12V P-P at the power
inserter. I used 75 ohm cable and "F" fittings because they were handy,
but I would use Mini Circuits MMICs and 50 Ohm cable if I built another
outdoor 60 KHz antenna.

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Michael A. Terrell
Central Florida


I have no problem receiving it on a number of different Ham and General
Coverage receivers using random wires or simple vertical whips. I also
hear it well with an active antenna. I have not noticed any real QRM
problems on 60kHz although there are some really strong noise sources at
other frequencies nearby.

Dave
45N 75W