[amsat-bb] Re: My rotators

Howard Long howard at howardlong.com
Thu Feb 4 15:12:18 PST 2010


I don't have a 5400 myself, but the Tracker will certainly work from a
software perspective. What I'm not totally sure of is the electrical
interface: the LVB Tracker provides open collector active pull down
up/down/cw/ccw control. It expects Az/El feedback of 0 to 5V (can be
calibrated for less) and it should be low impedance (~<1k ohm). The ground
return to the Az/El feedback must be very low impedance. 

I have a couple of rather old scanned docs on my PC, one's for a KR500 Az
only rotator which would need relays (with appropriate back EMF diodes)
placed across the up/down switches and possibly an opamp buffer on the
feedback pots. The other called "kenpro.jpg" that quite possibly someone
sent me asking the same question as you, and it is a section of a schematic
that shows PNP transistors and relays already in place, and a buffer for the
feedback pots, just like the Yaesu G5500, so that can be directly connected.

73, Howard G6LVB

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Bob McGwier
Sent: 03 February 2010 19:04
To: amsat bb
Subject: [amsat-bb] My rotators

I have a Kenpro 5400 (with the plug in the back of the box).  Is anyone 
using LVB Tracker with that unit?

It is going up right after some refurb and a thaw here.


(Co)Author: DttSP, Quiktrak, PowerSDR, GnuRadio
Member: ARRL, AMSAT, AMSAT-DL, TAPR, Packrats,
"the only people for me are the mad ones,
  the ones who are mad to live, mad to talk,
  mad to be saved, desirous of everything at
  the same time, the ones who never yawn or
  say a commonplace thing, but burn, burn, burn
  like fabulous yellow roman candles" Kerouac
Active: Facebook,Myspace,LinkedIn

Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

More information about the AMSAT-BB mailing list