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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>I have seen some chatter recently regarding loss of VHF channels due to NTIA reallocation operations. I would propose that any who wish to continue analog operations consider the 217-220 MHz spectrum. CERI at the University of Memphis has used these frequencies for the past 35 years in the analog New Madrid network (65 stations). The band is pretty free of competition, however channel 13 TV is right below the band with typically maximum power of 316KW. It is clearly the thousand pound gorilla in the room. Vertical polarization of antennas and cavity filters are required on telemetry paths that are anywhere near one of these transmitters. In rural areas it is usually clear sailing though. Our company has teamed up with Hamtronics (a long term ham equipment supplier) to produce a radio specifically for telemetry use by modifying the modulation circuitry of their equipment for low distortion transmission( <1%) of analog signals. The current radio is a synthesized unit with the three programmable frequencies and a variable power design that operates over a 100 to 1500 mW output power range. The receiver noise is around .3uV and the modulation bandwidth i2 300 to 3500 Hz. Frequency stability is typically better than 200Hz over a temp range of 0 to 120 degree F. The radio does not require custom crystal (or crystal compensation)<o:p></o:p></p><p class=MsoNormal> If there is sufficient interest, we will produce a new custom, frequency agile, 217-220 MHz analog radio system that will meet FCC emission masks while allowing full 25 KHz bandwith NBFM operation, thus allowing for unhindered use of all standard IRIG analog telemetry frequencies, This radio can also be made available for 12.5 KHz bandwidth use if necessary. We will try to market these radios in as cost effective way as possible which will depend on the quantity required. Small samples of the current radio in production are available for evaluation for $1200 per pair. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>VLF Designs<o:p></o:p></p><p class=MsoNormal>1621 Bella Vista Dr.<o:p></o:p></p><p class=MsoNormal>Jackson, Mo. 63755<o:p></o:p></p><p class=MsoNormal>573-204-1286<o:p></o:p></p><p class=MsoNormal>vlf@cablerocket.com<o:p></o:p></p><p class=MsoNormal>vlfdesigns.com<span style='font-size:12.0pt;font-family:"Arial Black","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>