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Title: OK, now I'm off in another direction,,,, Post by: K7NCR on November 04, 2009, 11:59:20 PM Just for something to think about while I work on the Marauder, I've been pondering a FM add-on for the VHF-1 Seneca. I've looked at some info from the internet. None to helpful. Lots of legal and not-so-legal FM modulators for audio devices, etc. Maybe a variation of varactor control switched in the VFO? Maybe I'm in over my head, but I like to experiment and learn as I go. ::) ::)
If it comes thru OK, see the scan of the VFO I attached. Title: Re: OK, now I'm off in another direction,,,, Post by: Pete, WA2CWA on November 05, 2009, 12:31:06 AM Make Heath Seneca A 70W 2M FM Amplifier, HRM, March 1989, page 8
Convert AM Transmitter to 2M FM, 73 Mag, Dec. 1966, page 100 Convert Heath Pawnee to 2M FM, 73 Mag, Oct. 1978, page 104 Title: Re: OK, now I'm off in another direction,,,, Post by: W1AEX on November 05, 2009, 12:47:53 AM I used to inject audio at the cathode of the VFO oscillator in my DX-100 to operate 10 meter FM. All I did was lift out the tube on top of the VFO, wrap a thin piece of wire around the cathode pin, and plug it back in. I fed that point with audio from an old Bogen PA amplifier using one of the line taps from the output transformer. I'm sure the impedance was all screwed up but it sounded great after a little help from friends in the area who listened and helped me to set the level correctly. I wrote a little article about it in the old AM Press Exchange but have no idea what issue it was. Seems like you could try something like that with the 6AU6 in the Seneca.
Title: Re: OK, now I'm off in another direction,,,, Post by: K7NCR on November 05, 2009, 11:04:26 AM Make Heath Seneca A 70W 2M FM Amplifier, HRM, March 1989, page 8 Thanks, Pete! I'll see if I can locate those issues, especialy HRM, 3/89.Convert AM Transmitter to 2M FM, 73 Mag, Dec. 1966, page 100 Convert Heath Pawnee to 2M FM, 73 Mag, Oct. 1978, page 104 Norm Title: Re: OK, now I'm off in another direction,,,, Post by: K7NCR on November 05, 2009, 06:17:46 PM These issues seem kinda hard to find,,
I, however was a bad boy and bought a 2 DVD set of HRM 2-68 to 6-90. Supposedly scanned at 300 DPI. Who should I send the royalty check to? ;D Title: Re: OK, now I'm off in another direction,,,, Post by: Ed/KB1HYS on November 05, 2009, 06:38:19 PM Me... :)
Title: Re: OK, now I'm off in another direction,,,, Post by: K7NCR on November 05, 2009, 09:52:37 PM :o :o :o Really? ;) ;) ;) Honestly, though, I usually don't buy written material off of e-bay, except original manuals, etc. We will see when I get them if the $16+ I paid was a flush down the drain.
Norm K7NCR Title: Re: OK, now I'm off in another direction,,,, Post by: KD6VXI on November 06, 2009, 10:39:08 AM :o :o :o Really? ;) ;) ;) Honestly, though, I usually don't buy written material off of e-bay, except original manuals, etc. We will see when I get them if the $16+ I paid was a flush down the drain. Norm K7NCR You can download the same thing off the internet for free. He took something off piratebay, burned it, and then burned customers :) --Shane Title: Re: OK, now I'm off in another direction,,,, Post by: K7NCR on November 06, 2009, 11:15:08 AM You can download the same thing off the internet for free. He took something off piratebay, burned it, and then burned customers :) --Shane Possilby, but my search only turned up torent based sites full of malware. I guess I don't mind paying for a copy if it will save some time wadding thru the CRAP! |