Topband: DX Conditions

[Lee STRAHAN]

     One of the products I put into production when I was running Hi-Z was a system that could receive in two directions at the same time, and even on different bands with one set of square or circle RX antenna elements. It was awesome watching Long haul DX stations on 160 meters switch back and forth between 2 close directions. This was especially frequent when beaming over the Pacific ocean paths. Also it was great for monitoring 80 meters and 160 meters at the same time while looking/chasing for DX on both bands.
   The system would split each array high impedance antenna element into 2 signals. Then each one of the two signals was fed into a separate phase combiner, direction controller and its own receiver. Two receivers separate with direction control for each on one set of high RDF array elements. This system was often used in diversity with two directions selected. It was a joy to experience.

 The very best diversity I listened to was one season my ambition took over and I set up 2 wide spaced 8 circle arrays about 1000 feet apart. I fed them into the Orion's dual receivers. My particular Orion only very slowly shifted phase between the receivers over 10 seconds or so and worked quite well. Unfortunately each year ended in a tear down of the receiving antennas and I never got the ambition to do that again.
   Wish I had done some recordings back then.
  Lee   K7TJR    OR


-----Original Message-----
From: Topband <topband-bounces+k7tjr=msn.com at contesting.com> On Behalf Of Tree
Sent: Friday, December 20, 2024 3:40 PM
To: jim at audiosystemsgroup.com
Cc: topband at contesting.com
Subject: Re: Topband: DX Conditions

Here is my favorite diversity recording to show it off.  Done with a K3 back in Boring:

kkn.net/n6tr/160/Diversity1590.wav
<https://www.kkn.net/n6tr/160/Diversity1590.wav>

You can "feel" the ionosphere breathing.  :-)  This is with one antenna north and the other south on 1590 kHz.

Many other sounds on this page are in diversity.  Back out the filename from the URL.

Tree N6TR

On Fri, Dec 20, 2024 at 1:41 PM Jim Brown <jim at audiosystemsgroup.com> wrote:

> On 12/20/2024 1:05 PM, Guy Olinger wrote:
> > There is a particular type of "diversity" that I have found
> > particularly useful.
>
> BTW, as long ago as the early '80s, I was utilizing diversity
> reception professionally with wireless mics operating high band VHF TV
> channels (that is, Ch 7-13, which are above 170 MHz). These were very
> good quality commercially mfd products from a SoCal-based company
> called Cetec-Vega.
>
> I was also doing frequency coordination for my clients (mostly local
> broadcasters, but also theatrical and sports facilities like Wrigley
> Field and Sox Park), using inter-mod-prediction software that
> Cetec-Vega provided, after modifying the source code to make the
> print-out more user friendly.
>
> The two receivers also implemented narrowband bandpass filters to
> prevent overload and intermod from strong local stations operating on
> those high-band channels.
>
> In those days, the radios were crystal-controlled. Within decade or
> two, the industry had migrated to UHF and implemented programmable
> synthesized frequency control. The market also became dominated by
> microphone companies like Shure, Sennheiser, Audio-Technica and
> Lectrosonics, a non-mic mfr near ABQ.
>
> 73, Jim K9YC
>
>
>
>
>
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