Hi Phil;
I find what you are doing VERY interesting. indeed. I can look and see what the LF cores and the windings are. I may have them in my small stock. I have one RX ensemble unbuild and 5 other RXTX ensembles not built, and one RXTX built. I had plans to make a whole QRP gaggle of rigs to use that I built. I am just now getting back to it.. as I had 2 strokes, right cerebral. I taught myself to walk and walk with a cane.. my mind is clearing although dizzy still and foggy after 2 years.. I had to go on disability. I am 67 healthy otherwise.
Let me look and see. LF interests me greatly. and there was another individual Roger Graves, VE7VV that specialized in using the RXTX as a LF transmitter at 160m.
I need to look up ndbs to see what their freq range is to see if I have the torrids.
Guy
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guy (at) eastroad (dot) org
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Have a good day!
Guy Mengel N1GMM