Wayne cites the MDS is -140 dBm with the KX3 preamp set to
30-dB. That is excellent and all that is needed for terrestrial 6m
operation.
I would dispute the advantage of mast mounting a preamp on 6m. I
recently showed a reader what the effect would be using a 0.5 dBNF
25-dB gain GasFet preamp at the antenna vs at the radio in an eme
operation. Sky noise temperature runs > 2000K at 6m even for quiet
locations with the result of only increasing MDS by a tenth of a dB
when the preamp is located at/near the antenna. Use of low-loss coax
like Belden-9913 or Times LMR-400 is sufficient to run 6m preamp at the radio.
On frequencies 2m-and-up the sky noise situation changes this to
where there is marked improvement locating a preamp at the antenna
(and essential for weak-signal work like eme). I will be running
800-1000w on 6m-eme later this year (after the yagi is mounted on a
new tower) and will run my 6m GasFet preamp at the K3 using the RX input.
73, Ed - KL7UW
http://www.kl7uw.com
[email protected]
"Kits made by KL7UW"
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