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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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7th Sep 2017, 9:14 am | #21 |
Pentode
Join Date: Jan 2013
Location: Powell River, British Columbia, Canada.
Posts: 217
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Re: Adding a Product Detector to an HRO-MX
Here are the two product mentioned in the hand written sheet I posted.
The tubes are 12AU7 type. But I seem to remember that either a 12AX7 or 12AU7 worked. The BFO and the product detector worked well, in the 1970s, to pickup RTTY, from Havana, Pyongyang, and various AFP correspondents in Asia. It was a model 15, with a 60 WPM gear. When it worked, the machine thumped a good cadence. When it missed a LFCR, it didn't.
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Steve Dow VE7ASO |