[Elecraft] KAT500 RF tap for SDR Pure Signal

[peterc281]

As well as using my K3 to drive my KPA500/KAT500 I am also using a Apache
Labs Anan-10. 

There is a means of improving the linearity of the SDR transmitter using
“Pure Signal” This is achieved by sampling the xmit signal and making
appropriate corrections via the computer.

The xmit signal is sampled at the output to the antenna and needs to be
appropriately attenuated in the order of 40dB.

As the KAT500 already is sampling the RF for various functions I would like
to tap off the RF signal to use for this feature. I see there are test
points in the KAT500 marked VFWD and VREFL but unfortunately they are DC
voltages and I just need RF.

So, the question is, is there a schematic diagram available for the KAT500
or has anyone been brave enough to jump is and tap of some RF for this or a
similar project?

I notice there is a capped off hole on the back plate which would make an
ideal place to fit a connector to output the signal.

Peter, VK3IJ




--
View this message in context: http://elecraft.365791.n2.nabble.com/KAT500-RF-tap-for-SDR-Pure-Signal-tp7597353.html
Sent from the Elecraft mailing list archive at Nabble.com.