In the May 2012 NCJ, I had an article on using an inexpensive
Chinese-made RF wireless relay board to switch 8 receiving antennas
without a separate cable, ~400 feet from the shack. The idea, suggested
by GM3SEK, was to couple the 300-MHz from the remote control to the coax
and pick it off at the far end, using short lengths of hookup wire as
the coupling loop. Works very reliably. I'm not sure if the hardware I
used can be programmed to switch most or all of the SPDT relays at once,
but there are lots of variations available online for peanuts.
73, Pete N4ZR
Check out the Reverse Beacon Network at
http://reversebeacon.net,
blog at reversebeacon.blogspot.com.
For spots, please go to your favorite
ARC V6 or VE7CC DX cluster node.
On 9/3/2013 10:01 AM, Jim Lux wrote:
On 9/3/13 6:43 AM, K0YR - Thomas Rieff wrote:
T/T
Any thoughts on how to switch multiple rotors with one set of cabling.
The towers I wish to switch are 500 feet from the cabin.
Or is there a better way of wireless remoting???
Tom, K0YR
You want to use one controller with multiple rotors?
How fast do you need to change between them?
Are you willing to run some extra wire out there (e.g. a 500 foot run
of Cat-5 type phone wire?) or are you trying to reuse wire that you've
already got installed.
Some sort of relay box with multipole relays seems like the best
scheme. These days, you can get long range bluetooth or WiFi operated
relays off the shelf. You can propagate the 2.4GHz signal down your
HF coax, if there's too many trees in the way. Sure, the loss is huge,
but it's a lot less than the 1/r^2 spreading, and it's not like you're
worried about a "good match" for the 2.4GHz.
If you've got power out there at the tower, there's various power line
signalling techniques (X-10).
You can do the RCS-4 scheme of sending AC or either polarity DC down
the wire, but if you have to build anything, I suspect that
building/buying BT or WiFi is comparable, and potentially a LOT more
useful in the long run.
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