George,
If using separate antennas and to protect the front end of your K2's
receiver from RF generated by your K2/100 radiated by its antenna, you might
want to consider adding an external relay at the K2's antenna input
controlled by the EXT AMP KEY line of the K2/100. Although I have not looked
at the timing sequence of this line in the K2/100 it should be such that
anything controlled by it is 'ready and waiting' before RF appears from the
K2/100's Tx output. I am certain that other people on the List would be able
to comment on this. The external relay would be used to disconnect the K2's
antenna from the K2's Rx input and ground the Rx antenna input, and should
be a fast acting type such as a reed relay..
Back- to- back diodes as protection devices should be avoided in a strong
signal environment at any point in a receiver chain unless increased
intermodulation problems are acceptable. The increase in IMD problems that
these diodes cause start well before they are fully switched on by incoming
signals.
73,
Geoff
GM4ESD
On Thursday, April 19, 2007 at 9:40 AM, George G4TPV wrote:
I have acquired a 2nd K2 (via a rally sale) so now have my K2/100 main rig
plus a K2 "QRP" rig.
One set-up that I would like to try is using the 2nd rig as an integrated
2nd receiver.
It has "RANT" & I can use separate aerials (antennas) - any advice/cautions
would be welcome. I absolutely don't want to destroy anything in either rig
!
Note : I have never owned or used a "high-end" rig with this in-built
capability
73
George G4TPV
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