1. Comparison of the Research Communications HDTV GaAs Preamps By G. L. Dybwad Albuquerque, NM USA gldybwad@comcast.net October 25, 2008

2. HDTV Viewing Conditions I’m located in Albuquerque, NM, and the HD broadcast antennas are only 9 miles away, but my antenna view is completely blocked from line of sight by a granite ridge of the Sandia Mountains as shown. This comparison data should be added to my previous data report of April 17, 2007. I use an AntennasDirect DB8 antenna and Belded RG11 low loss coax cable to the F-connector on my Dish 722 DVR satellite receiver. The only thing changed was the two preamp models located in the weather box mounted below the antenna.

3. Results of the Comparison HDTV Pre Amp Res. Comm. Model 9253 (no longer available) Res. Comm. Model 9260 (present production) Technical Specifications Noise Figure = 0.6 dB; 21.5 dB gain Noise Figure = 0.4 dB; 23 dB gain Surge ProtectionNOYES Current LimiterNOYES Digital Stations Received1217 Average Signal Strength for All Received Digital Channels 7679 Results The 9260 preamp, best I’ve tested, is even better than the 9253, and offers improved electrical protection on the mast