> For those, the noise from a Flex at 100w, at -77 dBc (which is -27 > dBm), can be quite substantial. Recall that S9 is approx -72 dBm. A > Flex is transmitting wideband S9+45 noise.
OK, I'm not a Flex user. But, I don't agree with your math. I am not trying to defend the transmitted phase noise performance of the Flex products, but... Your math is flawed. Assume 100w transmitter is delivering +50 dBm to an antenna. (100W is 50 dB greater than 1 milliwatt) Also assume you are at a receiving station, and hearing this station at S9+30 dB, on a receiver calibrated to 6dB/S unit, S9=50uV at 50 Ohms, or -73dBm for S9. Your receiving the fundamental signal at -43dBm (S9+30dB). With the transmitted phase noise 77dBbelow the carrier, it would be received at -120dBm, or about S2. Granted, it would be 10 dB stronger (abt S3.5), if you were receiving the fundamental transmission at S9+40dB, etc. But... the Flex is not " transmitting wideband S9+45 noise." Let's not blow this out of proportion. Bruce N1RX ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
