I tried the same thing on the bench with an old K3 with original synth
boards (no stiffeners) that I was upgrading. The new synth boards went in
just fine and I inserted a test signal at 28.0150 at 0dBm, 1 milliwatt. I
then tuned 1 kHz away and watched the noise floor drop to S1, so that I
could hear a -130 dBm signal just fine only 1 kHz away at 28.0161. I also
had the 400 Hz 8 pole filter engaged, but my eyes bugged out at the
performance. If there was any reciprical mixing, the band would have been
filled with broadband noise. I used to use the old Kenwood radios back in
the 80's (TS-820S and TS-830) They had all sorts of LO noise and croaked
badly with about an 80 dB range as I recall. A strong signal would fill up
the band for over 100 kHz either side with reciprical mixing noise. I am
seeing a radio that is about 50 dB better than that. I replaced the
Kenwoods with Ten Tec OMNI Vs and saw a huge improvement, but nothing like
what I am seeing with the new K3 synthesizer. Receivers can be so good now
that the real problem is transmitted junk from other radios and not front
end deficiencies in your radio.
Dave K1WHS
----- Original Message -----
From: "bozidar" <[email protected]>
To: <[email protected]>
Sent: Thursday, May 28, 2015 12:15 PM
Subject: [Elecraft] K3 and KSYN3A
Hi,
just done some tests with K3 and KSYN3A and result are amazing,
(it is not a scientific test in Sherwood stile, but say enough):
it is a P3 schreenshot as proof of incredible strong signal handling of
K3
with new KSYN3A board:
/P3 freq. span is 5 kHz,
red band is signal 59+60dB, centered on 7.134 MHz,
K3 is on SSB mode, filter BW2.4kHz center weighted (normalized - green
band)
- on 7.134 MHz,
in filter BW is SSB signal clearly and laud herd./
This all, remind me on video from IC7851 vs IC7800 RMDR characteristics,
with strong signal and week one ,300 Hz offset( search for Icom IC-7851 vs
IC-7800 RMDR Characteristics on YouTube)
Comments encouraged!!!
73 de S50BN
<http://elecraft.365791.n2.nabble.com/file/n7603576/P3_screenshot.bmp>
--
View this message in context:
http://elecraft.365791.n2.nabble.com/K3-and-KSYN3A-tp7603576.html
Sent from the Elecraft mailing list archive at Nabble.com.
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