[ADXA] 3y0k 80m info

[Joel Harrison]


In an off-line chat with Bill FUV he notes the Yaesu FTdx101 with 2 receivers are phased locked and provides true diversity capability.

So add that one to the list.

Tnx info Bill.

73 Joel W5ZN

> On Mar 8, 2026, at 7:07 AM, w5znjoel at gmail.com wrote:
> Jussi,
> 
> Your last sentence inquires about diversity receive. The short answer is
> YES, it will improve on QSB.
> 
> Most hams do not understand diversity reception. They believe you just throw
> out two antennas connected to a receiver and you're good to go. That could
> not be further from the truth! I know you are aware of the difference so for
> the benefit of others I'll briefly explain.
> 
> To correctly establish and take advantage of true diversity receive you must
> have two receivers, each with a separate antenna, and these two receives
> must be phase locked together. There are several claims from radio
> manufacturers that their radio will do diversity receive but that is
> blatantly false! There are only two radios currently that will perform true
> diversity receive and that is the Elecraft K3, K3s, K4D, and the Flex
> Radios. These MUST have dual receivers so you will need the 2nd RX in the
> K3/K3s and the K4 must be a K4D that has the 2nd RX.
> 
> It is my standard operating procedure on 160 meters to ALWAYS us diversity
> receive. The BSEF-8 vertical array is always on RX1 and the HiZ-8 on RX 2. I
> have the ability to switch either receiver to either the YCCC-9 or Beverage
> antennas if needed.
> 
> During diversity receive, RX1 will be in one ear and RX 2 in the other and
> you can hear the amazing "bouncing around" of the signals in strength in one
> ear versus the other. At times one will fade just so briefly to miss a
> character or more on CW but the other ear still has the sig. Will it also
> help on FT8? The short answer is yes.
> 
> There is one caveat regarding diversity receive, just like having a high-end
> RX antenna and that is it will NOT create propagation! You must still have
> propagation path at some level to establish or sustain communications.
> 
> 73 Joel W5ZN
> 
> -----Original Message-----
> From: adxa-bounces at mailman.qth.net <adxa-bounces at mailman.qth.net> On Behalf
> Of Jussi Eloranta
> Sent: Saturday, March 7, 2026 3:26 PM
> To: 'ADXA' <adxa at mailman.qth.net>
> Subject: [ADXA] 3y0k 80m info
> 
> I worked 3y0k last night on 80m around their sun rise (about 0530Z).
> There was nothing before that and the signal came up nicely for about 20 min
> and then was gone. So, in addition to possible early evening opening to
> Bouvet, be sure to also check out their sun rise.
> 
> I was also testing two receiving antennas, the inv L (which I use also for
> transmitting) and beverage on ground directed towards Bouvet (200 ft long
> with 320 ohm termination resistor, no impedance transformer). Both antennas
> were able to hear 3y0k with both showing deep QSB. But when one antenna
> faded away, the other one seemed to be coming up. I wonder if some sort of
> diversity set up would be beneficial here - to be tested.
> 
> Jussi (aa6kj)
> 
> 
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