At 08:02 AM 9/27/2006, Dick Green WC1M wrote:
>No, I'll need 24 of them -- one at each end, tower and shack.
>
> > -----Original Message-----
> > From: Keith Dutson [mailto:kdutson@sbcglobal.net]
> > Sent: Wednesday, September 27, 2006 10:54 AM
> > To: 'Tower'
> > Subject: Re: [TowerTalk] homebrew low voltage surge suppressors?
> >
> > WOW, they certainly have gone up in price! The RCT is now $99
> > at AES. But you will need 12 of the 8 wire RCTs, so that is
> > $1200. Let us know if you find a cheaper alternative. Thanks.
> >
> > 73, Keith NM5G
> >
> > -----Original Message-----
> > From: towertalk-bounces@contesting.com
> > [mailto:towertalk-bounces@contesting.com] On Behalf Of Dick Green WC1M
> > Sent: Wednesday, September 27, 2006 9:36 AM
> > To: Tower
> > Subject: [TowerTalk] homebrew low voltage surge suppressors?
> >
> > My new tower will have three 4-el SteppIRs, three TIC rings,
> > a T2X, a stack match and an SO2R switch box. That comes to 96
> > control wires. Since the tower is over 200 feet from the
> > shack, it's best to have a surge suppressor at both ends of
> > each wire. I used Polyphaser RCT surge suppressors for my
> > other tower, but the price has about doubled since I did
> > that. I'm looking at close to $3,000 worth of RCT surge
> > suppressors. Besides, the RCT mounting hardware is really
> > designed to clamp to a tower leg and I'll be mounting the
> > suppressors on ground panels inside metal NEMA boxes. I've
> > done that before and wasn't real happy with the result. Even
> > if I go with the ICE units, which have better mounting, the
> > cost will be quite high.
Why not put all the electronics out at the antennas, and just send
ethernet or serial data out?
At first it seems a bit weird, but by the time you buy 200 ft of 100
wires, and all the connectors, suppressors, you might be able to pay
for the necessary mux/demux at each end.
I ran into this with my phased array. At each antenna I have RCS-8V
relay box, which takes 6 wires. It was actually cheaper to buy $50
serial/relay converters from Velleman (requiring only 1 or 2 wires,
or a 900 MHz receiver) than to buy 100 ft runs of 6 conductor cable.
> >
> > So, I'm wondering if anyone has seen or designed a homebrew
> > low voltage surge suppressor circuit? My understanding is
> > that it takes more than just low voltage MOVs. You need
> > series inductance and/or resistance and a diode.
> > I haven't found anything appropriate on the web. Can someone
> > point me to a schematic and/or tell me how they did it?
> >
> > 73, Dick WC1M
> >
> > _______________________________________________
> >
> >
> >
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> >
> >
> >
>
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