[TowerTalk] TowerTalk Digest, Vol 129, Issue 10

[Donald Barnes]

Does anyone have any experience with or good reliable information on the owl antennas for 6 and 2? I would really like to put some up here but I keep hearing that the design is good but they aren't quite ready for prime time yet.
Joe Barnes  N4JBK

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>Today's Topics:
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>   1. Re: Switching Multiple Rotors (Jim Lux)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Wed, 04 Sep 2013 06:27:13 -0700
>From: Jim Lux <jimlux at earthlink.net>
>To: towertalk at contesting.com
>Subject: Re: [TowerTalk] Switching Multiple Rotors
>Message-ID: <52273531.8070606 at earthlink.net>
>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>On 9/4/13 4:43 AM, Pete Smith N4ZR wrote:
>> 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.
>>
>
>
>Velleman has a nice 8 relay module for $50 with 2 wire serial input, or 
>and RF module that you can solder in.  At least from the serial port 
>aspect, you can set one relay at a time, or all 8 at once. (e.g. you 
>send a byte that has all 8 relay positions).  I use them to control  RCS-8Vs
>
>
>The coupling loop scheme is one way, another is a T connector with a 
>tiny capacitor in the "arm".
>
>It doesn't take much coupling to make this work.
>
>Taking 2.4GHz WiFi/Zigbee/etc as an example..
>
>100 m through air has 80 dB loss (so radiating +20dBm gets you -60 at 
>the receiver)
>
>RG-213 is about 50 db/100 meters at 2.45 GHz
>
>So your coupling doesn't have to be all that great.
>
>I speculate, but have not tried, that coupling to the *outside* of the 
>coax would probably work: all you're trying to do is get somewhat better 
>than free space, and launching the wave is a sort of non-critical thing.
>
>Of course, if you wanted to be fancy, by all means, set up a G-line 
>launcher, etc.
>
>
>
>
>
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>End of TowerTalk Digest, Vol 129, Issue 10
>******************************************