Hi Sergio, Thanks for reporting these interesting results.
A few K3 users in extremely high-signal environments might benefit from a few extra dB of dynamic range, at the cost of a mixer add-on module like you described. However, I'd be concerned about the possibility of additional mixer spurs. Switching mixers put out a large number of VHF/UHF spurs that can mix with harmonics of other signal sources (primarily the VFO) to produce HF-6 meter spurs. This is an inherent issue with high-level superhet receiver designs. Our first mixer design trades about 1 dB of dynamic range and conversion loss for excellent rejection of mixer products above 60 MHz by integrating a balanced low-pass filter into the commutating path. Without this, there would be a "picket fence" of additional VHF/UHF products and thus many more spurs. Please let me know if you do a comparison test of the two mixers in this regard. The best way to do it is to slowly sweep through each ham band in CW mode using a narrow crystal filter. 73, Wayne N6KR On Sep 20, 2011, at 9:16 AM, ik8tng wrote: > The *Elecraft K3 *is one of the best performance commercial > transceivers > available to amateur radio operators. > While discussing with some friends it's receiver performances we > decided to > see if there were chances to improve it. When a receiver has a > dynamic > range over 90dB it is not so easy to pull-out additional dBs. > One easier mod to experiment was the replacement of the 1st mixer.... ______________________________________________________________ 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
