One of the neat things at VE6JY are cheap cameras that are either pointed at
markings on masts or straight up at some antennas.
Instant notification of misalignment or a cheap alternative to a position
indicator, either way, an option to consider.
73, kelly, ve4xt
Sent from my iPhone
> On May 28, 2018, at 12:27, Patrick Greenlee <patrick_g@windstream.net> wrote:
>
> Once upon a time a long time ago when Winchester drives were super high tech
> (circa 1972) you could buy COTS (Commercial Off The Shelf) components that
> could detect the passage of gear teeth and put out a pulse for each tooth
> passing the detector. IIRC they were three terminal devices (Hall effect I
> think) with a wire for supply, one for ground and one for the logic level
> output, i.e. digital ones and zeroes. There were schemes for detecting
> direction of gear rotation too so angular position could be known to the
> resolution of one gear tooth divided by number of teeth multiplied by 360
> degrees.
>
> LED light sources and photo detectors counting interruptions of the beam as
> the gear rotates were also used to maintain knowledge of angular position and
> direction of rotation. I think I could add either of these above
> technologies without the disassembly required to remove a gear and affix a
> magnet.
>
> I would assume similar (or better) tech is available these days.
>
> Patrick NJ5G
>
>
>> On 5/28/2018 12:10 PM, Dennis W0JX via TowerTalk wrote:
>> Kathy:
>> There is truth in the fact that there is a modification for counting the
>> gear turns. However, there is no kit at this time. The HyGain folks at Xenia
>> explained that the gear train needs to be disasembled and one of the gears
>> is replaced by one that has a magnet on it. Then a sensor is mounted that
>> counts the turns or senses the potion of the gear.
>>
>> I was told that I would need to contact a technician at the HyGain factory
>> and that they would explain what parts are needed to do the modificatoin.
>>
>> 73 Dennis W0JX
>> --------------------------------------------
>> On Mon, 5/28/18, <towertalk-request@contesting.com> wrote:
>>
>> Subject: TowerTalk Digest, Vol 185, Issue 32
>> To: towertalk@contesting.com
>> Date: Monday, May 28, 2018, 12:00 PM
>> Send TowerTalk mailing list submissions to
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>> Today's Topics:
>> 1. eliminating the 360 pot in
>> the Ham-m rotators (Kathy Bookmiller)
>> ----------------------------------------------------------------------
>> Message: 1
>> Date: Mon, 28 May 2018 01:32:58 +0000
>> (UTC)
>> From: Kathy Bookmiller <wb2aio@yahoo.com>
>> To: <towertalk@contesting.com>
>> Subject: [TowerTalk] eliminating the
>> 360 pot in the Ham-m rotators
>> Message-ID: <1878645705.5984595.1527471178921@mail.yahoo.com>
>> Content-Type: text/plain;
>> charset=UTF-8
>> I thought I saw something a few months
>> back about a mod to the venerable Ham-m. In it the pot would
>> be replaced by some type of counter device triggered by a
>> change to one of the gears. I've looked on their site and
>> don't see any mention of it.
>> At the time I saw this it was said a
>> retrofit kit may become available.
>> Was I dreaming or is this have some
>> truth to it
>> Kathy
>> ------------------------------
>> Subject: Digest Footer
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>> 32
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