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#11
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Since most surviving Chevy Vega's now have big-block V8-s in them that's
probably not a valid analogy ;-). "-Bill M-" exray@coquidotnet wrote in message ... Edward Knobloch wrote: I would simply use a divide by ten oscilloscope probe connected to the plate of the S-108 local oscillator tube, feeding a frequency counter. The divide by ten probe provides isolation, to avoid pulling the oscillator off frequency. If you just want a 100 KHz calibrator, I recommend an old Bud Radio model "FCC-90 B". It has it's own power supply, and requires no connection to the receiver. (Just uses a loosely coupled antenna wire near the receiver input). It has two tubes, a 35W4 and a 50C5, in a transformerless circuit. The older Bud model FCC-90 used octal tubes. 73, Ed Knobloch While all of the previous comments are good advice I suspect a counter would drive a guy crazy on an S-108 with the constantly drifting freq and oscillator pulling. The 100kc calibrator will get you in the ballpark...at least to as close as you can read the dial...I don't recall that there's a front panel tweak to align the pointer or LO to have the calibrator line up with the dial. Nice little radio but if you want a better radio, well... Its kinda like sticking STP racing stickers on a Chevy Vega. -Bill |
#12
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Let the newsgroup scroll proclaim that -Bill M- exray@coquidotnet scribed
upon its pages in : Nice little radio but if you want a better radio, well... Its kinda like sticking STP racing stickers on a Chevy Vega. -Bill So, who told you about my Vega? G -- Allen McBroom www.NPSTKD.com Remove WOOF when replying by email |
#13
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Allen McBroom wrote:
I've had an old Hallicrafter's S-108 since the early 70's, and trying to tell what freq I'm on is impossible. Does anyone know of a method for installing a crystal oscillator on this old tube rcvr, or some other method of acurately determining which frequency the radio is receiving at the moment? Many thanks for the help! How about getting a digital frequency display for the S-108. I use one with several of my boatanchors. Here's a website that makes digital display kits for shortwave receivers: http://www.aade.com/dfd.htm -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
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