Note that I installed this preamplifier in the RX IN/OUT path on the K3
rear panel
To enhance the 6 meter performance of my K3 I built the U310
preamplifier as described on N6CA's website:
http://www.ham-radio.com/n6ca/50MHz/50appnotes/U310.html
Tuned up on an HP8970A noise figure meter it gives 11.2 dB gain and
NF=1.3 dB.
The receiver's performance on weak signals was significantly improved.
I already had the parts but cost should not exceed $30.00 to duplicate
this preamp....hard to beat.
I have not done measurements on the radio/preamp combination to
determine any negative effect on the receiver performance but the K3,
which always performed well in the presence of strong signals,
continues to do so.
John, N6AX
K3 #567
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