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#1
December 11th 06, 06:35 PM
posted to rec.radio.amateur.homebrew
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Converting AM Car Radio to Shortwave
"AndyS" wrote in 1165840350.029509.309650@
79g2000cws.googlegroups.com: In my opinion, the easiest, most non-destructive way to do this is to add a converter, using the AM radio as a tuneable IF for AM transmissions. Agreed. And you can still listen to Rush Limbaugh by switching off the converter.... Or when you switch it on... http://www.techlib.com/files/rushconv.pdf Pick your 1MHz band, and tune away. You'll need to tweek a bit if you want to be very far from 15 MHz. -- David Hatch KR7DH |
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#2
December 12th 06, 12:06 AM
posted to rec.radio.amateur.homebrew
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Converting AM Car Radio to Shortwave
David wrote: http://www.techlib.com/files/rushconv.pdf Pick your 1MHz band, and tune away. You'll need to tweek a bit if you want to be very far from 15 MHz. -- David Hatch KR7DH Andy comments: Excellent, David !!! Thanks for the circuit. Note that it can easily be modified to get WWV also...... I suspect one could use a CA3028 if one wanted to build it with a single IC, for some reason... Yet another simple converter can be made using a NE602. I don't have a circuit handy, but it can easily be designed from the data sheet. Andy W4OAH PS I'm going to check out 15.42 Mhz --- I hadn't messed with it before..... |
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#3
December 12th 06, 12:08 AM
posted to rec.radio.amateur.homebrew
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Converting AM Car Radio to Shortwave
David ) writes:
Pick your 1MHz band, and tune away. You'll need to tweek a bit if you want to be very far from 15 MHz. If you choose the 31 and 25 metre bands you can receive both with one crystal in the oscillator. Many years ago I built a simple converter using a 10.7 MHz crystal and a tunable front end so I could tune 31 m band (osc on the high side) and the 25 m band (osc on the low side). Don't remember now where I got the circuit but it worked very well with a standard (in those days!) car radio antenna. .... Martin VE3OAT |
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#4
December 12th 06, 06:01 PM
posted to rec.radio.amateur.homebrew
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Converting AM Car Radio to Shortwave
David wrote: "AndyS" wrote in 1165840350.029509.309650@ 79g2000cws.googlegroups.com: In my opinion, the easiest, most non-destructive way to do this is to add a converter, using the AM radio as a tuneable IF for AM transmissions. Agreed. And you can still listen to Rush Limbaugh by switching off the converter.... Or when you switch it on... http://www.techlib.com/files/rushconv.pdf Pick your 1MHz band, and tune away. You'll need to tweek a bit if you want to be very far from 15 MHz. I'm not that terribly fond of Rush, but I think I might be able to adapt this to tune in other frequencies, so it should come in handy. Thanks! Ralph Glatt |
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