[Elecraft] In praise of the sub Rx & Diversity

Sun Oct 29 10:21:43 EDT 2017

Without diversity I couldn't do my 144 and 432 MHz moonbouncing the way 
I do. It's perfect for Xpol's since I can decode both H and Vpol and the 
very same time. Thats a huge advantage against other rigs. Love it, a 
great feature.

73 Udo, DK5YA

http.//www.dx7eme.de/

Am 29.10.2017 um 14:24 schrieb Victor Rosenthal 4X6GP:
> Almost the only time I don't use diversity is when I need the 
> subreceiver for split pileup operations (and often it's enough just to 
> watch the P3, so even then I use it). It can make a huge difference.
> My antennas are only about 15m apart, but one is a dipole and the other 
> a (vertically polarized) Pixel Loop.
> The loop has a relay that disconnects it when I transmit so there's no 
> danger to the subreceiver.
> 
> 73,
> Victor, 4X6GP
> Rehovot, Israel
> Formerly K2VCO
> http://www.qsl.net/k2vco/
> On 29 Oct 2017 02:11, lmarion wrote:
>> 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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