[PCR-1000] Re: antenna switch box 2-->1

[Tom Waters]

There is a switch-box made for folks like myself who have an older Dish
Network (18" satellite tv system) that has the older dish, not capable
of getting all 500 channels.  I had to pick one up, and install a second
dish on my roof, and the switching is done automatically, dependant upon
the channel I select. It works identical to what is described below, as
mini-dish receivers have an 18v on their line.
It was 30 bucks, is weatherproof, and an instant install, in this
scanner scenario, you will need to build the interface on the house end
to do the switching.
Check your local satellite tv store/installer guy.
It is an LNB Switchbox.

Tom Waters
KE4RXM

-----Original Message-----
From: pcr-1000-admin@mailman.qth.net
[mailto:pcr-1000-admin@mailman.qth.net] On Behalf Of Ubbe
Sent: Wednesday, April 10, 2002 13:53
To: pcr-1000@mailman.qth.net
Subject: [PCR-1000] Re: antenna switch box 2-->1


There are plenty of coax relays available if you look at the satellite
receiver business. They need relays to switch between LNB's, so you have
good relays designed to work with GHz signals and that are very
inexpensive to buy. You have several options, controlled by applying 18v
to the coax line, insert a 22KHz tone or tone pulse coded DiseqC
signalling. If you get the 18v DC relay type and mount that at the mast
foot, you can switch to the discone when 18v are applied and use the
longwire when there's no voltage in the coax. Normally scanner antennas
and longwires aren't DC grounded so there shouldn't be any problems. But
you can easily modify the relay by opening it up and remove a bypass
choke. Then there will be no voltage going out to the antennas.

Inserting the voltage into the coax line can be done by using readybuilt
boxes, that only consist of a choke and a capacitor, or you could open
up that relay switch and remove the wires going to the relay coil and
solder your own wires there and feed the relay seperatly with a 12v
source. The 2GHz relay switch normally costs around $10.00

Ubbe.

krat wrote:
> 
> I am looking for an electronic switch to select between 2 coaxial line

> (1 long wire, 1 discone).  I want a device that can be remotely 
> controled (or activated by a relay).  I need that because my pcr-1000 
> is located in the basement and most of the time I'm listening to the 
> scanner via netmeeting on my laptop upstair.
> 
> Anyone knows if something like that exist on the market?  but I don't 
> want to add a loss in the signal or an impedance drop.
> 
> Regards,
> Krat
>


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