I'm doing some work on measuring RFI levels on 6m at my QTH. One tool I'm using is the P3 with averaging set to 20 to make for easier reading.
With the K3s preamp 2 engaged I read -162dbm on the P3 scale when connected to a 50ohm dummy load. I'm trying to correlate that to the MDS numbers for the K3s. The K3s specification with Pre2 engaged is -145dbm measured in a 500hz bandwidth. The effective bandwidth of the P3 per the P3 manual is Scale/450 which for 5K that I'm using is 11hz. Since noise power scales with the square root of the bandwidth that should result in a ratio of SQRT(45) or 6.7. 10*log(6.7) = 8.2 Adding -162 to 8.2 only brings me to -153db. So it seems I'm missing something. The P3 is telling me the K3s is 8db more sensitive than its specification. What am I missing? Thanks JIm ab3cv ______________________________________________________________ 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 Message delivered to [email protected]
