More NC-57

I added a Heathkit QF-1 Q-Multiplier ( http://www.heathkit-museum.com/ham/hvmqf-1.shtml ) to my NC-57. The QF-1 provides additional selectivity or signal rejection as desired. It was marketed by Heathkit starting around 1956 and was a fairly common accessory. It requires a connection to the IF stage plus B+ and filament voltages available at the NC-57 accessory socket.I found this to be a big help. The QF-1 effectively eliminated...

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qrz - Google Search

Please click on this hyperlink to go to the QRZ web site and input your call.Then browze around and enjoy. http://www.qrz.c...

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NC-57 Project with comments about the NC-125

For the past few days I've been going through my NC-57. This radio was marketed by National in the late 40s and early 50s. Features include a built-in speaker, electrical bandspread (uncalibrated), regulated B+ for the HF oscillator and a tuned RF stage. Advertised frequency coverage was .54-55MHz. See http://www.io.com/~nielw/nat_list/nc57.htm...

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