[Elecraft] In praise of the sub Rx & Diversity

[lmarion]

I have been trying along time to get buyers to go for it and get the sub rx 
for its many pluses.  One that is kind of not obvious is the diversity 
receive. I knew about it from my years of working on FAA radars, and 
military search RADARs maintained by the FAA. All search radars from way 
back have diversity RX, because it will find those small target weak 
reflections. And some specialized diversity receive is being developed for 
those dog gone drones.  I have not measured the sensitivity of the K3s, but 
there are weak stations that are not heard when not in diversity. A friend 
in the city of Spokane can adjust the phase between his antennas and null 
out some strong RFI completely!

Leroy AB7CE

-----Original Message----- 
From: Bill Johnson
Sent: Thursday, October 26, 2017 7:56 PM
To: Gary at ka1j.com ; elecraft at mailman.qth.net
Subject: Re: [Elecraft] In praise of the sub Rx & Diversity

I use diversity on 20 meters with a vertical SteppIr and a loop.  Both are 
separated about 150'. What a difference.  Amazing.  Makes a huge difference 
with stations fading in and out and near the noise level.  I can work them 
with the Loop, but the vertical is so helpful when receiving.

73,
Bill
K9YEQ

-----Original Message-----
From: elecraft-bounces at mailman.qth.net 
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Gary Smith
Sent: Tuesday, October 24, 2017 10:38 PM
To: elecraft at mailman.qth.net
Subject: [Elecraft] In praise of the sub Rx & Diversity

When I bought the k3 in 09 I went all out and bought most of the accessories 
to go with it. One of these was the sub Rx and a full matching set of 
crystals for it. As upgrades happened I did them all and wasn't using the 
Sub Rx in diversity so much but, the advantage of the Sub Rx was always 
there with flexibility I take for granted.

So I upgrade to the K3s and migrated the sub Rx to it as well. I just don't 
think of diversity much but that was one of the reasons I bought the Sub Rx 
in the first place. With the 3 dB loss going to Diversity, I just listened 
more with the main receiver and let it go from there.

So today I'm working a ve7 on 10M and the band is going out. I can hear him 
but it's at that marginal iffy point, I was missing characters in his CW. I 
have a HI-Z triangular & a circle 8 pair of Rx antennas. The Circle 8 rocks 
on the low bands, has a filter to cut out above 40M but the triangular has 
no such filter and I often hear better on it than on the the roof mounted 
tribander. So for fun, I used diversity and the triangular on the sub,
160 sloper for the Tx antenna & Voilà, I heard him so much better, finished 
the Q and that reminded me of the real advantage of diversity and why it is 
an asset.

So now it's tonight, I see 3C0L is still on the air at around 3AM their 
time, on 20M. They're heading home today and the low band antenna is packed 
up already.
What troupers to still be in the game at this point. But I digress... So 
here they are, I don't have a good antenna for 20M, have to use the 160M 
antenna or tribander.
RFI from the neighbors makes the tribander useless so I hear them on the 
sloper and can hear them on the Hi-Z Triangular a bit better but much QSB so 
remembering the success with the VE7 earlier I go Diversity & all of a 
sudden, solid Q5 copy, no QSB and I snagged them on 20 CW.

Diversity really made the difference. I bought the K3s because it had such 
excellent specs, nothing else to me came close, save for 1-2 radios that in 
09 were hot and cost more than a new car. And they weren't any better in 
practicality than the K3 was. I bought the Sub Rx for the diversity and now 
today, while the K3s is itself stellar in all the right ways, it is an a 
better product with the Sub Rx.
I'm really honored to have such an
incredibly capable radio.

Just sayin'

73,

Gary
KA1J

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