RLVZ wrote: > > Hi Guys, > > I'd appreciate your thoughts as to why my K-3 receiver is so noisy. I'd > really like to make this radio perform. The radio is Serial #603F > (factory > model) running 1.2.10.27. I purchased the unit from the original owner a > couple of months ago so I don't know if it's always been this noisy but I > do > know it was the same before I recently updated software to 1.2.10.27. > The > radio is in immaculate condition and was never used mobile or bounced > around. > (it's a beautiful radio that looks like new!) > > I say the receiver is noisy based upon listening to dozens of different > signals on: 40/20/15 m. and by doing numerous A/B comparison tests. The > comparison tests were done with the K-3 Pre-Amp turned Off. (and tried > with ATT > on and off but mostly on to reduce noise). > > Radio 1: Yaesu FT-1000-MP w/AF Mod. A signal is peaking S-8 and with the > no signal noise level is averaging S-1. Therefore, the signal is peaking > aprx. 7 s-units above the noise based upon the MP s-meter and the signal > sounds > loud and is way above the noise level. Now I switch to the K-3: > > Radio 2: K-3 tuned to the same signal with PreAmp Off and is peaking S-7 > but the no signal noise level is noisy S-4 to S-5. Therefore, the signal > is > peaking only about 2 or 3 s-units above the noise level based upon the K-3 > s-meter. The result is that the MP has aprx. a 4 s-unit S/N ratio > advantage. > > > Thoughts: I realize that all s-meters read differently and the fact that > the MP s-meter shows a 4 s-unit stronger signal above the noise level > doesn't > mean alot. But the fact is that the signal on the MP sounds MUCH louder > with alot more headroom above the noise level. The K-3 receiver sounds so > noisy even with the S-7 signal that it isn't enjoyable listening to and > that's > why I ran the comparisons because I couldn't stand all the noise. > Switching > on the K-3's NR, ATT, and/or adjusting the RF Gain does help some but the > signal still sounds noisy compared to the MP. > > Based upon "Reviews" of the K-3 I believe that I must have an unusual "K-3 > noisy receiver" problem. > > I'd sure appreciate your ideas on how I can get a better S/N ratio on my > K-3. > > Thanks! > >
Hi Dick. I wonder if what you are experiencing is simply the result of your K3's S meter being adjusted to read high on noise, coupled with the fact that its calibration results in something close to the "standrard" 6dB per S-point? I would suggest that you perform the S meter calibration procedure described in the manual. I am not familiar with the FT-1000MP but with many radios the S meter basically reads the AGC voltage and it takes a significant signal to shift it at all after which it shoots up at about 2dB per S point until it reaches the S9 level. ----- Julian, G4ILO. K2 #392 K3 #222. * G4ILO's Shack - http://www.g4ilo.com * KComm - http://www.g4ilo.com/kcomm.html * KTune - http://www.g4ilo.com/ktune.html -- View this message in context: http://n2.nabble.com/Noisy-K-3-Receiver-tp4173832p4174647.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
