Hi Dave,
Our PR10 preamp module has an MDS in the -143 to -144 range on 10
meters. It doesn't get much better than that on any ham transceiver.
(Using it with a K3 requires a KXV3 or KXV3A module as well, since it
gets patched through the RX ANT IN/OUT jacks.)
The stock MDS of the K3 on 10 meters is typically -136 dBm. This is
consistent with a radio optimized for very high dynamic range.
73,
Wayne
N6KR
On Oct 1, 2012, at 2:13 PM, Dave Hachadorian wrote:
During the CQWW RTTY Contest this past weekend, I got the feeling
that the K3 receiver could have used some additional RF gain. I
was using the 250 Hz filter with +4 dB of I.F. gain dialed in.
Switching the preamp on and off produced just a barely
perceptible change in the background noise. I seem to remember a
previous discussion about the need for a ten-meter preamp, but
haven't heard any more about it. Has anyone done a test to see
if the minimum detectable signal is up to snuff on 10?
Fifteen meters was better, but still less than what I expected
when switching the preamp in and out.
Dave Hachadorian, K6LL
Yuma, Arizona
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