Charlie,
I use a HDR300. IMO, the control function is not an issue. However, the
indication function will be a problem. When diagnosing a design faux pas with
the direction indication, I saw that the signal coming from the rotator could
vary between rotators.
They use a 3-turn pot w/ 1:1 gearing from the rotator output shaft. But, the
pot isn't installed to be at zero rotation = 0° azimuth, and the signal at 0°
azimuth will be some value above 0 volts. Because no two pots are installed
exactly the same, the output will be somewhat different from one rotator to
another. Also, the voltage at 360° azimuth won't be the same from one rotator
to another. Thus, the setup of the controller is going to be different -- the
GAIN and ZERO (offset) settings will be different. Those controls adjust the
input of the CA3162E A/D Converter such that its output is 0 to 360. I hope
this makes sense.
BTW, something with my rotator's direction pot seems to have gone DOA recently,
giving a steady "-87" indication. Substituting a trimmer made the display work.
Ohmmeter tests in the shack indicate something not right on the tower. I
ordered a replacement from Newark, Bourns pn 3547-1AA-102A (about $30 shipped).
vy 73,Bryan WA7PRC
Date: Mon, 9 May 2016 17:35:46 +0000 (UTC)
From: n1rr@comcast.net
To: TowerTalk <towertalk@contesting.com>
Subject: [TowerTalk] Using HDR-300 rotors on one control box
Re: Using HDR-300 rotors on one control box
Any issues I should know about before trying to control two HDR-300's
separately
(one at a time) with one control box ?
-Charlie N1RR
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