Hi Klaus,
Matt and Don, if this is a problem with _any_ zero
frequency IF (direct conversion) receiver then the KX3's
concept would be a design error. ( I hope it is not.)
It is not a design error. Simply every design has it's own limitations.
If I switch to RX SHIFT I will have a receiver with the
most advertised KX3 feature, narrow spaced dynamic range,
dropping to values of rigs of the last century, like IC-735
or Lowe HF-235 or Drake SW8.
(see http://www.sherweng.com/table.html)
Please compare apples with apples (not with oranges). KX3 is a portable
travel radio with possibility to be used with internal batteries. Compare it
with the similar stuff like FT817. Besides even without roofing filter and
with 8 kHz IF it has much better DR then IC735 and many others.
Additional I would have thrown the money for the roofing filters
out of the window, as we say here in Germany.
That is the way I thought first, when I have discovered the direct AM
detection problem. Then I realized that this problem only exists part time.
All the other time I can use roofing and dual receive. Therefore your money
are not thrown out of the window.
My KX3 is SN 051. Unlike me, you could find the information about direct
detection of KX3 with zero IF setting here on the reflector, prior to
purchase. The problem exist mainly in Europe and many of the US customers
are not affected.
Yes, this design has some limitations but still IMHO this is the best radio
of its class and it costs every dollar we have paid for it.
I hope there is a possibility of rejection by software, but I
have no expertise in SDR at all.
Wayne once wrote to me that he may try to enable dual receive even with 8
kHz IF but so far it is not implemented. I doubt that direct AM detection is
possible to be rejected by software.
No one of Elecraft has answered up to now, so I stay curious.
Did you send message to elecraft technical support? Or do you expect them to
answer your concerns here on the reflector? They sure are not obliged to do
the latter.
BTW, later you may discover couple of other issues with KX3 which are not
that obvious and which I have already discovered. Or you may just search
this reflector and find out.
73, Igor UA9CDC
--
73 Klaus DF1TL
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