[Elecraft] Sherwood Receiver Test Data - K3S Added Today

[Wayne Burdick]

Bill Breeden <breedenwb at cableone.net> wrote:

> Rob Sherwood added the K3S to his Receiver Test Data page today.


Yes. We're pleased to see some excellent test results, including 106 dB of IMDDR3 at 2 kHz for both the 200- and 400-Hz filters. (The K3 came in at 104 dB for the 400-Hz filter. The 107-dB reading is within the usual +/- 1 dB lab/tech repeatability figure.)

Also worthy of note: sensitivity of -145 dBm for the new Preamp 2 on 10 meters. This preamp is also used on 12 and 6 meters. 

I checked with Rob, and that blocking dynamic range number (>154 dB) is *not* a typo. He said he saw less than 3 dB phase noise degradation at 100 kHz with +19 dBm fed into the radio, and stopped at that point. I guess there's no point in melting the signal combiner :)

(By the way, Rob's K3S BDR test level of +19 dBm is exactly 10 dB *higher* than the preamp-OFF ADC clipping level of the 6700. With preamp ON, it would clip at an estimated -11 dBm.)

73,
Wayne
N6KR