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Showing posts from September 19, 2018

K3 with 144MHz XVTR integrated

This is how the 144/28 fits into the K3 with 2nd Rx and KXV3
Also with the original  Elecraft  144MHz  you will need to fit an extra Antenna connector  BNC
I drilled an  20mm pass trough hole to lead the  coax  through the PA compartment to the 144 BNC This is a delicate job it needs precautions to avoid damage.
I removed the left side panel and used a trapped small multi hole drill with an extension hexa shaft.
those one's are available at eBay and are very good to have.

An automatic 12V 144 band  power switch must be added.
A P-channel IRF9540 with some logic switches 12V at 144MHz band
The  diagram above shows the 144 bandselect  switch it is made on a smal piece of PCB
2 LEDS  one =  12V   and the 2nd indicates 144MHz band 12V = on
Using the D15 ACC external control signals.
Those signals are convenient also available at the backside 20pole connector J90 of KIO3 shown at top picture.
With the restriction that the D15 ACC  connections have a series 220R prote…