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Title: 420-490KHz PTO Post by: Tom W2ILA on January 28, 2008, 12:12:41 PM I have a PTO thats a Collins 70-E knockoff and it tunes 420-490. Anyone have any ideas for a project for this thing? BFO?
Tom Title: Re: 420-490KHz PTO Post by: WA1GFZ on January 28, 2008, 12:25:41 PM almost 600 meters????
Title: Re: 420-490KHz PTO Post by: k4kyv on January 28, 2008, 01:09:34 PM (1) A super stable BFO for receivers with i.f.'s in the 455 kc range. I know some receivers have 470 kc i.f.'s and I have heard of 465 as well. 455 is smack in the middle of the range of that PTO.
(2) Heterodyne it with a xtal oscillator somewhere in the 2 mc range, to make a stable VFO or homebrew slopbucket rig to cover the 70 kc segment of 160m of your choice. (3) Use the 2nd harmonic to run a pirate broadcast transmitter in the 840-980 kc range. (4) Use the 4th harmonic as a VFO to cover 1800-1960 on 160m. Title: Re: 420-490KHz PTO Post by: w3jn on January 28, 2008, 03:21:25 PM THat's probably just the PTO coil from a R-390. I don't recall a complete PTO (including the tube and associated circuitry) for that range.
Yep, a BFO is the likely project for such an animal. Title: Re: 420-490KHz PTO Post by: Tom W2ILA on January 28, 2008, 08:50:26 PM Yep. its a complete PTO in a can with the usual tube socket and 4-pin plug. I'll hook it up and fool a bit with it as BFO then maybe find a project for it.
TNX all TM Title: Re: 420-490KHz PTO Post by: k4kyv on January 28, 2008, 09:21:36 PM I have one from a 60's vintage frequency synthesiser, perhaps the same one. There was also another PTO that covered somewhere in the AM broadcast band. But IIRC, neither of them fall completely within a ham band. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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