[Moon-net] 5500 ROTATORS FOR EME ELEVATION

[jjm]

I agree with Charlie.
With F6KSX we have used a similar switched system to drive the AC motor of a
KR500 to rotate 16*21 elts on 70 cm... see my web site, F6KSX page from 1988
to 1991. We used it during some EME expeditions without problem.
It is quite simple with 2 NE555 and 1*triac (I hope TRIAC is OK in
English?).
I can scan the used schematic if any person is interested. Contact me direct
via email.
73. JJ F1EHN
http://www.f1ehn.org 

> -----Message d'origine-----
> De : moon-net-bounces at list-serv.davidv.net [mailto:moon-net-bounces at list-
> serv.davidv.net] De la part de Charlie Kahwagi
> Envoyé : vendredi 25 janvier 2008 14:56
> À : MOON_NET
> Objet : Re: [Moon-net] 5500 ROTATORS FOR EME ELEVATION
> 
> Hello all......not sure if this solution has been mentioned...but just in
> case......
> 
> I have used the 5500 for EME purposes, and I slowed mine down using a 555
> timer  and a transistor to switch the common   line  in "pulses".  The
> circuit is in the "VHF-UHF DX BOOK"  and works exceptionally well.  The
> advantage with this arrangement is the motor always sees the full voltage
> and so is "less stressful" on the motor  than other arrangements which
> reduce voltage .  The circuit is easily adaptable to AC or DC motors.  I
> built the board  and placed it in the rotator controller and a back panel
> switch  selects it in line or not.
> The rotator can be slowed to "less" than a crawl.
> 
> 73
> Charlie
> VK3NX
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