Now that we've covered roofing filters, a Q on sub-receivers

[John Harper AE5X]

Imagine my dismay as a submarine veteran at learning that the K3's
sub-receiver has nothing to do with an AN/WSC-5  ;-)

As I understand it, the main purpose of a sub-rx is to allow diversity
reception based on the fact that this 2nd receiver would be using a
different antenna than the main rx, correct? I'm not sure if there are other
advantages and am curious if that is the case as I ponder which config of a
K3 to eventually order. If that is the only advantage, I doubt it would be
necessary or useful for me...if I need that much finessing to copy a
station, I'll never work him with 100 watts and any antenna I can put up.

I'll probably get a 2nd round of whatever version of K3 I decide on as I am
(finally! after 23 years) getting transferred back to 5-Land soon. In the
meantime, it sure is educational reading the posts of some of you who can
translate and "analogize" some of the options I've never had reason to
consider before.

Thanks and 73,

John Harper AE5X
http://www.ae5x.com




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[N2EY]

-----Original Message-----
From: [hidden email]

>As I understand it, the main purpose of a sub-rx is to allow diversity
reception based on the fact that this 2nd receiver would be using a
>different antenna than the main rx, correct?

No. That's just one use of a "sub" receiver. Here are some more:

1) When operating split, it lets you listen to your tx freq while the
main rx listens to the other guy.
2) When contesting, you can park the sub rx on a rare one's pileup that
you are trying to crack while the main rx is used to run a freq or to
hunt & pounce new ones.
3) You can be operating on one band/mode with the main rx and use the
sub rx to check out other band/modes' activity at the same time.

Yes, 1) and 2) can be done witrh judicious use of memories, A=B, SPLIT,
RIT, XIT and other features. But a second receiver lets you do them
*simultaneously*.

There are probably others I haven't thought of. Which one is most
important depends on what kind of operating you do.

The sub/second receiver idea isn't new; the Ancient Ones were doing it
a half century ago, but with truly separate receivers. In the '60s,
Hallicrafters made some transceivers with "dual receive" but you needed
the external VFO accessory, and what you got was the ability to listen
to two freqs on the same band simultaneously, through the same rx chain.

73 de Jim, N2EY
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