I have noticed this on my K3 also. Compared to my FT-1000D it´s much noisier. As far as I understand the MDS of the K3 is around 134 dBm, I have measured my FT-1000D to about 141 dBm I think it was. My feeling is that something isn´t right with the K3 but I simply haven´t had time to persue it.
/ Jim SM2EKM ---------------- Dave G4AON wrote: > I have a feeling something may have changed in later K3 firmware, > possibly as a result of calibrating the receiver gain via the K3 > Utility. Previously I have been able to calibrate the S-Meter from > around S6 to S9 +60 and have it almost perfect, now it doesn't seem to > be possible to get it that good. > > Anyway, these are actual measured results from my K3, which is using the > latest pre-release beta firmware (v3.41). These measurements seem OK to > me and the K3 doesn't seem any noisier than other radios on my 80m > dipole. The S-Meter has been calibrated without the pre-amp in use. It > is quite hard to set it correctly all the way from S1 to S9 +60... AGC > set to default values. SMTR OFF = 027, SMTR SC = 010, SMTR PK = OFF and > SMTR MD = ABS (the latter makes no difference to the S-Meter readings > below). > > S1 is solid at -115 dBm, S2 is solid at -109 dBm and S3 is solid at -105 > dBm. These are using CW with the pre-amp off on 80m, 2800 Hz filter. > There is about 1 S-point drop using either the 400 Hz or 250 Hz filter. > > MDS (3 dB SINAD) is -135 dBm in a 400 Hz bandwidth with the 2800 Hz > filter, pre-amp off. An input of -126 dBm gives 10 dB SINAD for the same > settings. SINAD is signal to noise and distortion. > > The K3 is sensitive enough on the lower bands to not need the pre-amp, > which of course would give rise to higher noise levels. > > 73 Dave, G4AON > K3/100 #80 > ______________________________________________________________ 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
