[TowerTalk] Fwd: Re: Ameritron RCS 8V Remote Coax Switch

[Jim Lux]

>Date: Thu, 05 Apr 2007 11:26:00 -0700
>To: "Phil Jung" <k9pj at b2xonline.com>
>From: Jim Lux <jimlux at earthlink.net>
>Subject: Re: [TowerTalk] Ameritron RCS 8V Remote Coax Switch
>
>At 11:13 AM 4/5/2007, you wrote:
>>Easy Question for the group:
>>
>>  Will  20 Ga wire be sufficient to power the 12vdc relays at a length of
>>140'
>
>Depends on what voltage you're feeding to the control box.  The 
>relays are standard 120 ohm coils and need about 8-9V to pull in 
>(depending on temperature, etc.),, but, figuring you have 120ohm 
>coils and 12V, they are drawing about 100 mA.  20ga wire is 
>10ohms/1000 ft (again, depending on temperature, etc.) and you've 
>got 280 ft total. so call it 3 ohms.. at 100 mA, that's 0.3 V...  I 
>think it will work<grin>.  If you went to 30AWG wire, it would be 30 
>ohms for a 3V drop, and even then, it might work, if you were 
>running 14-15V into the control box.
>
>On my RCS-8Vs, anyway, the 12V supply is a basically unregulated 
>wall wart that puts out a lot more than 12V with no load.
>
>
>
>>  - and does anyone have experience with the  reliability of this unit
>>and weather resistance of the box when exposed at the base of a tower?
>
>We've had several RCS-4s, which are packaged basically the same way, 
>out in the environment here at the W6VIO club station, and they've 
>seemed to survive ok.  Mind you, we don't get snow but once every 
>decade, but we get lots of wind and dust.
>
>
>
>
>>I acquired the unit recently in apparently unused condition without manual.
>>The manual does not seem to be on the MFJ website.
>
>http://www.ameritron.com/man/pdf/RCS-8V.pdf
>
>
>>Thanks for any info.
>>
>>73, Phil, K9PJ
>>
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