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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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Old 7th Sep 2017, 9:14 am   #21
radiotechnician
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Join Date: Jan 2013
Location: Powell River, British Columbia, Canada.
Posts: 217
Default 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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