Maybe the signals are louder on the KX3, which would fool people into
thinking it was more sensitive? I've always thought my K3 was adequate
on 6 meters. Not gangbusters, but certainly adequate.
73,
Scott, N9AA
On 7/8/13 6:09 PM, Edward R Cole wrote:
Been a lot of discussion on this topic so I decided to make some
"real" MDS measurements comparing my K3/10 (4340) and KX3 (475). I
hope the columns read clear for everyone (I can create some charts on
my website, if not):
Test set up: XG3 + JFW 30-dB step attenuator + 6-inch of RG-58 w/BNC's
The XG3 is installed in a Hammond "diecast aluminum" enclosure with
BNC feedthru adapter so the unit is fully shielded (I have made MDS
measurements using additional 20-dB coaxial attenuator to -157 dBm +/-
2 dB. That was using double-shielded coax whereas today's tests were
using ordinary RG-58 (so adds a little uncertainty on the minimum
signal). MDS detector are my "ears" so that makes a bit more
subjective for absolute measurements.
Both radios tuned with 2.8 KHz bw in USB, Elecraft's MDS spec is done
at bw = 500-Hz.
50.120 MHz
Level (dBm) K3+PRE KX3+PRE(30-dB) K3 (no preamp)
XG3 off S1 S0 S0
-73 S9+5 S9 S8
-107 S3 S4
-123 --- S1/S2
-130 S1 below MDS
ANT S2 S2/S3 S0 (slight rise in noise
in speaker)
28.200 MHz
Level (dBm) K3+PRE KX3+PRE(30-dB)
XG3 off S1 S0
-73 S9+5 S9
-107 S4 S3
-123 --- S0
-133 S1 Below MDS
I also checked frequency using the K3 as reference (has EXREF) and the
KX3 was 50-Hz higher than the K3 on 6m and 40-Hz higher on 10m (I have
not done the temperature calibration for the KX3). I did not measure
freq drift after transmitting.
One would state that the K3 looks better than the KX3 for receiver
sensitivity (yet the KX3 hears 6m much better - hmmm?)
73, Ed - KL7UW
http://www.kl7uw.com
dubus...@gmail.com
"Kits made by KL7UW"
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