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Re: [TowerTalk] Mounting a Remote Antenna Switch?

To: Eric Rosenberg <>,,PVRC Reflector <>
Subject: Re: [TowerTalk] Mounting a Remote Antenna Switch?
From: Jim Lux <>
Reply-to: Jim Lux <>
Date: Thu, 6 Dec 2007 17:07:00 -0500 (EST)
List-post: <>

-----Original Message-----
>From: Eric Rosenberg <>
>Sent: Dec 6, 2007 3:11 PM
>To:, PVRC Reflector <>
>Subject: [TowerTalk] Mounting a Remote Antenna Switch?
>I have an Ameritron RCS-8V I'd like to mount, along with lightning arrestors, 
>inside a weatherproof box that will go on the exterior wall of my house (I 
>don't have a tower, but do have a number of wire antennas). 
>My questions: 
>1.  Can I mount the RCS-8V with the relays facing out and not down, as one 
>would if it was mounted on a tower or mast?

Sure.. the relays are not position sensitive.

However, they ARE vibration/shock sensitive.  Bump the box too hard, and the 
little tabs on the back of the armature will unseat from the notches in the 
bracket.  I suspect that a fair number of "DOA" relay boxes are from getting 
shocked in shipping.  Out of 5 RCS-8V boxes I got in one big shipment, I had 1 
relay that had unseated.
>2.  Can I use CAT5 cable for the control line? It is 4 pairs of small gauge 
>cable, and the switch wants 5 conductors. 

Are you sure it's only 5 conductors?  Isn't it 1 common and 5 relay lines?

In any case, Cat5 is AWG24 and will work just fine. It's about 25 ohms/1000 ft. 
 The relay has a 120 ohm coil and probably pulls in at about 8-9 Volts. 10-20 
ohms in series probably won't keep it from pulling in.  The RCS8V control box 
isn't particularly voltage sensitive (it's normally fed by a 12V wall wart) so 
you could probably run it a bit overvoltage (possibly shortening the life of 
the LEDs) to make up for the loss.

jim, W6RMK

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