Topband: DX Conditions

[Tree]

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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> Reflector
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