The R303-137 is a very sensitive wideband fm receiver optimized for reception of NOAA APT and similar weather facsimile images on the 137 MHz band. You can use it with any popular APT software. The R303-137 is based on our popular R303 ham band receiver. It was designed as a lower cost successor to the R139 Receiver.
The R303-137 has excellent sensitivity (0.2µV); so no preamp is needed for normal operation. Special wideband filters enable low distortion for high quality imaging, even with doppler shift on the satellite signal. The frequency synthesizer provides four channels to cover all current US APT satellites.
The R303-137 is designed from the ground up for optimum satellite reception, so it provides much better results than a modified scanner receiver.
Here are some useful websites with information and programs you can download. Please let us know if you find any others we should know about or if any of these are no longer functional.
Note that we do not endorse any programs listed here as we have not tested them.
WXtoImg freeware program, another highly recommended program for imaging.
Turnstile Antenna construction article. (See article below for photo of this antenna.)
Article by AMSAT on how to use the R139 Receiver in schools. Newer R303-137 is similar.
Review of R303-137 Receiver in an Nov 2010 QST article.
Citizen Scientist Article on older R139 Weather Sat Rcvr
NOAA status for polar orbiting satellite websites.
R303-137 Receiver board wired/tested ...$229.00
Click here for tuning tools and RCA plug & cable to connect to board.
Here is a sample image made as a composite from multiple images. Click to enlarge. (Thanks to Jerry, KD6JDJ)
This popular unit achieves a low noise figure (0.6 dB) with a gain of 18 dB. Operating power is +12Vdc at 10 mA, connected through a feedthrough capacitor. The 50 input and output use BNC jacks.
The preamp is connected in series between the antenna and the receiver to effectively lower the noise figure of the receiver front end, allowing weaker signals to be received. A preamp normally is not needed if your antenna feed has low loss. If you cannot use premium quality coax or if your coax is over 50 ft., this preamp installed at the antenna should improve reception.
LNK-137 Preamp .......$99
(Ship wt. 1 lb.)
For installations where interference is caused by nearby transmitters, such as near an airport, this low-noise preamp with a 3-section high-Q filter may solve the problem. It is installed in line with the coax from the antenna.
Maximum 40 dB rejection is obtained for signals more than 7 MHz above or below the 137 MHz band; however, some benefit is achieved even for signals closer in frequency.
LNP-137 Preselector ......$99