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Old 03-12-2012, 03:01 PM
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Default Remote Antenna Switch Box


So I was sitting in the radio room today deciding on what my next project will be.

As I was looking at my previous homebrew switch box i decided since ill be putting up an Astro-Plane for local talking and still running a Pdl-2 for dx.

Why not make a remote switch box so i don't have to have 3 runs of coax coming out of the house.

I got to looking around the room at my spare parts and found that i have most of what i need to do it, I can salvage the SO-239s from the previous switch box or just take out the switch I have in there and just install the relays in that box.

I have 2 relays, 2 switches, 4 SO-239s, and the box i used before. i found a 12 volt wall wart in a box of spare parts so there's the power source. I know I can run the power through the coax, but haven't figured out how to do that and don't understand how it works. So for now Ill just run a cord out the window and to the box.

I'm already going to be running a Rotor cable out the window this week once I get my rotor setup so ill just run the power cable for both at the same time and then ill be done with any antenna work for the summer.

I'll post pictures during the build and after the build.


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Old 03-12-2012, 03:44 PM
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Someone please tell me how to run a 12VDC power source through the same coax feeding an antenna without wreaking havoc with the radio.

This is a concept that I have obviously missed over the years.
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Old 03-12-2012, 03:52 PM
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Quote:
Originally Posted by pro151 View Post
Someone please tell me how to run a 12VDC power source through the same coax feeding an antenna without wreaking havoc with the radio.

This is a concept that I have obviously missed over the years.
http://www.ameritron.com/pdffiles/RCS-4X.pdf

Been around for years.

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Old 03-12-2012, 04:01 PM
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I use 30amp SP DT relays 12vdc automotive type.

I also do not like the idea of voltage on the coax from an external source so I use wire to the switch. 24g is not expensive and works well.

I use a five position band switch to select the antenna I want to use.

I have swept this with the antenna analyzer and have no issues.

One run to the tower of coax, then up to five antennas can be connected to the home brew switch, works great.

Source for 30 amp relays are automotive salvage yards. Hard to beat a 30 amp relay for $1.00

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Old 03-12-2012, 04:07 PM
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Well how about that! Out of all of the crap I have seen, built and done over the years, this is the first time I have heard of or seen this mentioned.

Thanks for the lesson!
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Old 03-12-2012, 04:15 PM
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this is one of them things I'm shocked that more people haven't built. or they have and just never talked about it.

Wavrider, you are correct its hard to beat useful relays at a junkyard. I actually have 2 relays out of an old amp some one dropped off with me for parts, the pills were bad and i never had any plans on getting it back up and running, so there's the relays i needed. i just hope the hold up. if not then ill switch them out to the ones you've used and be done. i do have a question for you,, do you run any kind of power and if show how much do you believe the relays will hold up to?

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Old 03-12-2012, 07:40 PM
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Relays are wired in. now power hooked up yet that will be done tomorrow.

First test tonight was to see how the swr looked. so far so good. no change in swr.

I'll post pictures tomorrow of how it looks tonight. and after I hook up power to the relays. It doesn't look pretty but it works and thats what matters most.

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Old 03-13-2012, 04:31 AM
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Quote:
Originally Posted by caspear1978 View Post
this is one of them things I'm shocked that more people haven't built. or they have and just never talked about it.

Wavrider, you are correct its hard to beat useful relays at a junkyard. I actually have 2 relays out of an old amp some one dropped off with me for parts, the pills were bad and i never had any plans on getting it back up and running, so there's the relays i needed. i just hope the hold up. if not then ill switch them out to the ones you've used and be done. i do have a question for you,, do you run any kind of power and if show how much do you believe the relays will hold up to?
I have used full legal limit 1500 Watts during testing of the switch box. No issues.

The reason I use automotive relays, they are sealed, I.E. weather proof

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