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Old February 6th 10, 05:14 PM posted to rec.radio.amateur.homebrew
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Default 88-108MHZ BC RX 'pulled' for 137MHz Wx signals?

In article ,
lenseman wrote:

Has anyone pulled a VHF Rx to enable the Wx APT transmissions at
137.1MHz? If so, how easy is the conversion?

If not, a downconverter to enable the Wx signals to be received on a
VHF wideband broadcast receiver.


David-

If the FM receiver has high-side injection for the broadcast band, you
may be able to pull the local oscillator a bit higher, and receive the
137 MHz signal using low-side injection. I think the receiver's RF
amplifier stages would need to be retuned as well. A counter would be
helpful to be sure you are receiving the right signal.

I think it would be easier to build a crystal controlled converter to
translate the 137 MHz signal to the FM receiver's IF frequency.

Fred
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Old February 7th 10, 12:45 AM
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What would be the point.... the FM radio already can convert the 137megs to 10.7 megs with just modified coils! Why complicate something simple? A signal generator would be more useful than a freq counter to get it on frequency. The beauty of it is it will also receive aircraft .... the FM discriminator on cheap FM radios will also happily demodulate AM. I have done this, it works well, and takes just 30 minutes.

Last edited by triode : February 7th 10 at 12:49 AM Reason: spelling
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