Matt,
Yes, I moved the decimal in the wrong direction! Your calculation is
correct.
If you have the K2 connected to an antenna near other antennas that is
being used for transmit, then I would strongly recommend that you either
disconnect the antenna from the K2 (or KX3 or any other receiver) during
the time you are transmitting. That could be accomplished automatically
with relays, but if you are not doing SO2R, manual antenna switches will
do that task just as well.
73,
Don W3FPR
On 5/2/2014 5:59 PM, Matt VK2RQ wrote:
Thanks Don. I was chatting to a fellow KX3 owner about how the KX3 protects
itself in the presence of strong RF, and he remarked that my K2 would probably
do the same. When I looked into it, I was reaching similar conclusions as you,
although I didn't find any information about maximum signal ratings for the
mixer.
BTW, 39mW corresponds to 16dBm, which is indeed huge. I calculated 0.14Vrms to
be more like -4dBm (ie. an S9+69dB signal), but maybe there's a stray decimal
point, or I've missed an assumption somewhere.
Anyway, best thing is to take some measurements, and see if an external
protection device is warranted. Thanks to Steve for the diode suggestion when
using separate receive antenna.
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