[Boatanchors] FS: FT243 7160 kHz AM band Crystals

[Drew P.]

On his selection of 40 meter crystals for sale, "Bry" remarked:

(snipped)

"Some of these will make great multipliers onto 10m AM also..."

In my opinion, only one of those frequencies would make a great multiplier onto 10m AM:  7250.

Back when 10 was open, I had a crystal on 14.400 which I used in my Hallicrafters HT-9 to get on 10 meters, 28.800 Mhz.  I could sit there all day and call CQ and never get a response.  The radio had good power output.  The antenna was reasonably good.  I then dug out an old Knight VFO, and made up a doubler circuit with a 6AU6 in a small aluminum box.  This plugged right into one of the plug-in modules in the HT-9, and a piece of coax brought in the Knight VFO's 40 meter signal.  I made many good contacts both local and DX on 29.000 with the VFO-doubler-HT-9 setup.  But when I'd for the heck of it try 28.800 either with VFO or the crystal, no response whatsoever.

I fiured it wasn't the MUF, as there was plenty of DX activity down lower in the band.  It must have been mode-selective propagation; AM signals simply do not get out on 28.800 (snicker).

And now it is all completely moot, as sunspots have become a thing of the past, or so some reports say.

Drew