Thanks Peter,
I used Lab Receiver Test Data Comparisons (ARRL QST Review Data, plus
some data from Sherwood Engineering).
Using preamp on and 20 kHz spacing (as 20kHz only available for 703 ip3)
MDS – IMD dynamic range = IMD level [ -141 - 91 = -50 dBm]
MDS – BDR = blocking level [-141 – 120 = -21 dBm
RIG is 703
MDS (dBm)
-131 preamp-off)
-141 (preamp-on)
BDR 'Desense'
95 5 kHz spacing pre-amp off
122/120 20 kHz spacing pre off / on
IMD DR3 'Intermod'
76 5 kHz spacing pre-amp off
89/91 20 kHz spacing pre off / on
Ip3 (dBm)
+11/+1.9 20 kHz spacing pre off / on
+56/+47 Ip2 (dBm) Out of band Signal Rejection pre off / on
Best,
Dan
Peter Wollan wrote:
I can only compare the K1 and the K2. They are both great kits, but
after that they don't really compare. The K2 is a full-featured rig,
and the K1 is a special-purpose, trail-friendly CW rig. The K1sounds
great, and has filters, and what it does, it does very well. I don't
notice any difference in MDS. However, I tried, once, to use my K1 at
our club's Field Day, near a high-power station. It was completely
swamped by anything transmitting even two bands away. In contrast,
the K2 is happy with another station on the same band, as long as the
antennas aren't too close and there's some space between the
frequencies.
I think your numbers for the 703 are way too good. Look at the rig
comparison chart on the Elecraft site -- the numbers are pulled from
ARRL reviews, for the most part. Unfortunately, the K1 and KX1 aren't
there, but the 703 is.
Peter N8MHD
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