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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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