Diversity reception what is it

Gerald

Dwayne_AB6A

A second receive slice ideally connected to a second receive antenna which tracks to the first slice - audio for the first slice is set to output the left channel (ear) and audio for the second slice is set to output to right channel (ear). Your brain puts the two receive sources back together. it can make a difference with a single receive antenna by playing with filtering for each slice.

Bob K8RC

Patrick

Ria

K3SF

Jim Gilliam

Ria

In W8JI's article he explains why that doesn't work out, at least not as well as stereo diversity or true (voting receiver) diversity. I have tried it and went back to one in each ear... but I also tried it on a friend's K3S and I must admit that it is a better experience. 

Ria

Since I use diversity primarily for chasing DXCC, that option is out for me as it's against DXCC rules to use remote receivers. 

Neil D Friedman N3DF

As I revall, my Dovetron terminal unit circa 1970 had the capacity to utilize diversity reception to maximize RTTY copy in fading signals. 

Gerald

I was hoping the second receiver’s signal would be tuned to an area near the primary signal, receive near-signal noise and invert the noise 180 degrees. Then, if it were mixed with the primary receiver’s signal it would cancel out the noise. This may work much like noise canceling headphones. I misunderstood your purpose of ‘diversity’ reception, sorry.

Chris DL5NAM

Ham Radio is more much then DXCC !

Geo diversity is one point on list of FRS - they have quietly forgotten :-( 

Dave-N9CHM

I agree with Paul, I use an inv V and an inv L on 160M with a 6600M, I prefer putting both signals (SSB) in the center position of the audio slider. It works great. I've read the article you mentioned several times, and I can't see (hear) the problem doing it this way. On signals >500 miles from me, the RX'd inv L signal can be from an S unit to +20db better than the inv V (as one would expect), and I can mute one signal or the other just to hear the difference (or use left-right speakers for either antenna). So, at least for me, I don't hear a problem if using both signals in the center position of the audio slider.

WA6FXT Mike

I would still like to see FRS develop the true rf (dual SCU, phase) diversity that was being touted when I chose to send my $1000 ‘early adopter’ reservation in May 2012.

mike WA6FXT

Butch

I too do not separate the left and right Diversity channels, but rather center both during Diversity Reception. Seems to work better.

And I agree with WA6FXT, a Diversity Phasing adjustment should have been implemented into SmartSDR by now. Lesser expensive competition has a leg up on this (along with Noise Reduction). Flex Programmers... get crackin'! :D

Butch KF4HR

Dwayne_AB6A

A logical AND operation on the audio from the two SCU's seems like a trivial programming exercise? It's something offered on a number of open source and commercial audio programs... Seems like some R&D is required.... (Ripoff and Duplicate)

Dan Trainor

The state of the art is diversity reception is that should INCLUDE the ability to do phasing between both signals to support the use case of having one of the antennas being a RX-only noise receptor and the other your main TX/RX antenna or other RX antenna. The purpose is to phase out the local noise from the main signal by adjusting the phase and amplitude using typically circular graphic display with a line control moved by the mouse, such as what is in SDRPlay RSP and also ANAN SDR radios to maximize S/N. This is only one use case of Diversity reception but a particularly valuable one when you live in a suburban noise. Receivers that don't have this capability today are seen as falling behind the state of art. Other forms of Diversity reception, not without standing. Such as geographic diversity where antennas are located farther apart, sometimes many miles apart. Or other use cases where antennas are on same property but have different orientations or polaritons. When you put all these use cases together, you have comprehensive diversity reception functionality. Flex is way behind. dan

Butch

Dan - I'm curious what program allows the SDRPlay to use phase and amplitude for adjustable diversity receive?

KF4HR

Dwayne_AB6A

Ralph - Since diversity reception on on the Flex outputs a left and right audio channel from the SCU's, they can be fed into any "audiophile" mixing program for post processing. Audacity as an example and using a  Nyquist recipe for post processing the left and right channel.

Dwayne_AB6A

Just to add and looking for feedback...

For post processing the audio signal with left and right channels, what would be the best algorithm to use against the left and right channel? Take the lowest value from either channel, or some other approach?

Bill AB7AA

I have been doing diversity reception for about 18 years now and the whole station is set up for it. I originally started out by phase locking two IC-746's and using the binaural method of one antenna in each ear. I now use two 6700's on 4 diverse antenna systems. I agree with W8JI's page on the subject that one can hear thru the noise better with the binaural setup. I also have several JPS SNV-4 signal voters that work well because they vote the better S/N of 4 channels and eliminate the noise of the others, but, they were only designed for voice bandwidth.

I like viewing diversity on separate panadapters. With the proper antennas, one can **** the band and immediately pick out lower angle DX from closer stations along with other characteristics.

Bill AB7AA

Butch

Dwayne - I'm not familiar with the Audacity program. Do you happen to know whether this program provides for both phasing as well as amplitude adjustments between L and R channeling?

Butch KF4HR

Dwayne_AB6A

Ralph - There is much you can do with Audacity. To extend its capabilities you can use downloadable Nyquist filters to tweak your audio...

https://wiki.audacityteam.org/wiki/Download_Nyquist_Plug-ins

https://www.audacityteam.org/about/nyquist/

This is as far as I have got at the moment - Playing with Audacity and Nyquist. I don't have the optimal receive only antenna set up at the moment but this dialog has prompted me to do something over the weekend. I have good programming skills, I just need to tweak my radio setup before I start too play with the programming aspects on Audacity.

Bill AB7AA

I have been doing diversity reception for about 18 years now and the whole station is set up for it. I originally started out by phase locking two IC-746's and using the binaural method of one antenna in each ear. I now use two 6700's on 4 diverse antenna systems. I agree with W8JI's page on the subject that one can hear thru the noise better with the binaural setup. I also have several JPS SNV-4 signal voters that work well because they vote the better S/N of 4 channels and eliminate the noise of the others, but, they were only designed for voice bandwidth.

I like viewing diversity on separate panadapters. With the proper antennas, one can **** the band and immediately pick out lower angle DX from closer stations along with other characteristics.

Bill AB7AA

K3SF

Dwanye

The logicval AND of each SCU is easily accomplished by bringing Both to the center and not left ear and right ear...

They combine in the center since they are in phase and the strongest( aka loudest channnel prevails)...

The left ear/ right ear combo channel setup requires too much cognitoive loading to easily select the best signal

i typically use two different antennas...sometimes ame polarity BUT spaced apart and other configuration is different polarity

Paul K3SF

Dan Trainor

Dan - I'm curious what program allows the SDRPlay to use phase and amplitude for adjustable diversity receive?

KF4HR

Hello, program is SDRUno and RX is RSPduo. dan