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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