About Us

triode · 12:49 AM

Quote:

Originally Posted by Fred McKenzie

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

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.

Thread Tools	Search this Thread
Show Printable Version	Search this Thread: Advanced Search
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
137Mhz antenna	JIMMIE	Antenna	6	December 11th 06 03:56 AM
FA: (3 hours left) VHF AIR 118-137MHZ AM BASE STATION TRANSCEIVER - DIGITAL	OttPrivateSale	Swap	0	May 25th 06 03:13 PM
maxtrac's pulled f/s	Jerry	Swap	0	August 28th 05 03:02 PM
FA: VHF - AirBand Base Transceiver 760ch 118-137mhz w/power supply	waterfun	Equipment	1	June 10th 05 04:43 PM
Mechanically designed FM/VHF (87.5-108Mhz) Omidirectional antennas.	Richard	Antenna	3	January 19th 04 11:44 PM

Menu

About Us