[TenTec] RX366

[Rick - DJ0IP / NJ0IP]

John, there were two threads going on under the same subject.

I was not responding to the AM Broadcast issue, but rather to the question
how big the difference is between the old 2nd RX and the new 2nd RX on the
Ham Band performance.  

There the upwards vs. downwards conversion makes a significant difference.

73
Rick, DJ0IP

-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of John Henry
Sent: Monday, May 20, 2013 2:38 PM
To: Discussion of Ten-Tec Equipment
Subject: [TenTec] RX366

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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