Re: K3 PR6 preamp
Posted by
G3TCT on
Jun 24, 2010; 10:38am
URL: http://elecraft.85.s1.nabble.com/Another-Happy-Customer-tp5205110p5217525.html
Ed
There's a more reliable way of doing this. Turn on the dBV measurement
facility on the K3 and turn off the agc, reduce rf gain a bit. Arrange for
50ohm resistor noise to indicate 0dB and then substitute the 6m antenna and
see the difference.
BTW the preamps won't be "below a 290K source" - they're already at 290K or
more!
73
Graham
> With both preamps on S=4
> Both preamps on with antenna disconnected; S=3
> So its a pretty quiet area with only one s-unit rise in noise.
> For comparison with a 50-ohm termination both preamps see S=4
> This indicates the preamps are low-noise below a 290K source.
>
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