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Re: Topband: CY9C

To: jim@audiosystemsgroup.com
Subject: Re: Topband: CY9C
From: Rudy Bakalov via Topband <topband@contesting.com>
Reply-to: Rudy Bakalov <r_bakalov@yahoo.com>
Date: Sat, 7 Sep 2024 16:48:09 -0400
List-post: <mailto:topband@contesting.com>
Is this published/documented anywhere? My in-band tower is about 150’ from the 
main tower and there is significant interference (but manageable ) between the 
two radios.

Rudy N2WQ

Sent using a tiny keyboard.  Please excuse brevity, typos, or inappropriate 
autocorrect.


> On Sep 7, 2024, at 3:55 PM, Jim Brown <jim@audiosystemsgroup.com> wrote:
> 
> On 9/7/2024 11:17 AM, Rudy Bakalov wrote:
>> How does this work? IF this is indeed the case, this would be a great 
>> solution for multi-op contest stations.
> 
> Very careful design of both RX and TX antennas and their matching networks, 
> physical separation of RX and TX antennas, combined with very careful design 
> of very narrow-band pass and reject filters for RX, and combiner networks for 
> TX that prevent each TX from seeing the other. Combining networks for TV and 
> FM broadcast transmitters have been in common use in major cities for more 
> than half a century at sites like the Empire State Building, the World Trade 
> Center, Chicago's Hancock Building and Sears Tower, and mountaintop sites in 
> the West.
> 
> Very complex design of both the system and individual components. As one of 
> my old EE profs would say, "non-trivial!"  Uses everything I learned in EE 
> 60+ years, and at a much higher level than I ever did anything. :)
> 
> 73, Jim K9YC
> 
> 
> 
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