Actually, a lot of this is misunderstood.
The RX366 related to how good or bad it receives AM Broadcast has nothing
to do with upconversion or downconversion.
The reason the RX366 doesn't provide AM Broadcast reception as good as the
ham bands is due to a broadcast band filter before the roofing filters.
This is to ensure that the umpteen hundred gigawatt station 2 miles down
the road does not get into the receiver path. You can measure differences
in ham bands when the local AM station is at full power in a rig that
doesn't have a broadcast band filter. The original sub receiver in the
565/566 was actually the Jupiter receiver, and it did not have a broadcast
band filter in line.
What we did fail to realize though when designing the Eagle and it's
subsequent reuse as the RX366, is that hams would want to use their Eagle
as a high quality AM broadcast band receiver in the ham shack.
Me, personally, I'd go down to radio shack and pick up a $12.00
AM/FM/Weather/etc radio for this, and get the RX366 to get the best 2nd rx
for ham operations.
.... Just my two cents.
For future rigs, we will consider the impact of having a separate path in
the preselector for AM Broadcast and treat it as a band of it's own. But
that is up to discussion/design/prototyping in house.
Thanks, and 73,
John Henry, KI4JPL
TEN-TEC Engineering
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