Topband: CY9C

[Michael Walker]

Hi Rudy

Essentially, he is using FlexRadios (FLEX-6700's and FLEX-6500's)  on the
island and a 900Mhz RF link for AF and command and control.  Not far off
what I do with my remote station except I use the internet and his is
900Mhz link is a TCP/IP RF link.

His CW operators are not even on the boat.  They are at home.  Same for his
Digital operators.  The SSB operators are on the boat.  This keeps his
expenses, such as food way down! :)

Next, he did genius work with the amplifiers, and you can watch the video
to learn more about how he kept the weight down and his work with water
cooling and  large capacitors.

For you, there is no reason why you can't move your RF parts to the base of
the tower(s).  Less coax means more RF out on the air and more RF into the
receiver(s).

All this equipment is available off the shelf today and it is plug and
play.  For an engineer like you, it is a child's play setup.

Mike va3mw






On Sat, Sep 7, 2024 at 4:59 PM Rudy Bakalov via Topband <
topband at contesting.com> wrote:

> 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 at 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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> Reflector
>
>
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> Reflector
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