I assume a simple MMIC amp plus a simple resistive attenuator circuit
will provide enough isolation and also provide for matching levels
up/down as may be necessary. At least, that will be my first cut at
the problem unless somebody else comes up with a better plan before
my K3 arrives.
At down east microwave ( http://www.downeastmicrowave.com/cat-frame.htm ),
see the
<http://literature.agilent.com/litweb/pdf/5967-6159E.pdf>INA10386
(DC-2GHz, 24dBG, 3.5dB NF +14dbm 1dB Gain compression ) for only $5.
Very easy to use something like this, I think.
Depending on the signal level of the K3 IF output, we might get
enough isolation from a resistive attenuator alone and still have a
usable signal level on the softrock panadaptor.
I would much prefer a plug and play manufactured solution if it takes
more than an attenuator, but not an expensive one.
Jerry W4UK
At 07:29 PM 2/11/2008, stephen pearce wrote:
A month or so ago one of the Elecraft engineers pointed out that
if the softrock lite rx is connected directly to the if port on the k3
there was a significant issue with coupling of rf from the softrock
board into the
rx if of the k# with consequent degradation in rx performance ...
Has anyone produced a design for a suitable isolation amplifier/
coupling stage which will
prevent this and still allow the softrock to be used (in conjunction
with a pc) as a panadapter?
Thanks
--
Stephen Pearce
zl1any
Whangarei
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