The Great South Bay, Amateur Radio Club, of which I’m a member wants to put together a satellite station. They have an existing home made AZ EL power unit which works. They are looking into interfacing an LVB tracker with it. and need to know what voltage level input is required for the feedback loop. The unit currently puts out 0-6.25vdc corresponding to 0-360 AZ and 0-180 EL. Looking at the G5500 schematic they go through an opamp arrangement but do not provide any voltage levels.
If anyone can the club with some info I'd sure appreciate it.
Thanks,
W2JV Peter
Hi Peter, Looking through the documentation I have on the LVB tracker it looks like it has been designed for 0 to 5 VDC for AZ and EL feedback. Typically rotors have a wirewound "pot" with one end grounded and the other end open. A constant current source is fed to the wiper and the sense voltage is measured at the constant current source. If you can trim the constant current source, you can set the max value to 5 VDC. The LVB tracker has a calibration process to set the range of AZ and EL. Howie AB2S
From: PeteW2JV@verizon.net To: AMSAT-BB@amsat.org Date: Tue, 16 Feb 2016 20:30:03 -0500 Subject: [amsat-bb] Fw: Fwd: LVB tracker
The Great South Bay, Amateur Radio Club, of which I’m a member wants to put together a satellite station. They have an existing home made AZ EL power unit which works. They are looking into interfacing an LVB tracker with it. and need to know what voltage level input is required for the feedback loop. The unit currently puts out 0-6.25vdc corresponding to 0-360 AZ and 0-180 EL. Looking at the G5500 schematic they go through an opamp arrangement but do not provide any voltage levels.
If anyone can the club with some info I'd sure appreciate it.
Thanks,
W2JV Peter _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Peter,
It isn't shown on the schematic, but elsewhere in the rotator docs (page 5, External Control) it specifies 0-4.5V DC for the position sensing outputs. Depending on the existing interface, a simple voltage divider would probably do. I don't have an LVB tracker, so I can't comment on that end.
73s,
Alan WA4SCA
<-----Original Message----- <From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of W2JV <Sent: Tuesday, February 16, 2016 7:30 PM <To: AMSAT-BB@amsat.org <Subject: [amsat-bb] Fw: Fwd: LVB tracker < < <The Great South Bay, Amateur Radio Club, of which I?m a member wants to put together a satellite <station. <They have an existing home made AZ EL power unit which works. They are looking into interfacing an <LVB tracker with it. <and need to know what voltage level input is required for the feedback loop. The unit currently puts <out 0-6.25vdc corresponding to 0-360 AZ and 0-180 EL. Looking at the G5500 schematic they go <through an opamp arrangement but do not provide any voltage levels. < <If anyone can the club with some info I'd sure appreciate it. < <Thanks, < <W2JV Peter <_______________________________________________ <Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available <to all interested persons worldwide without requiring membership. Opinions expressed <are solely those of the author, and do not reflect the official views of AMSAT-NA. <Not an AMSAT-NA member? Join now to support the amateur satellite program! <Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
The input to the AZ and EL A/D's are clamped to +5V by diodes as well so this makes sense.
From: wa4sca@gmail.com To: PeteW2JV@verizon.net; AMSAT-BB@amsat.org Date: Wed, 17 Feb 2016 06:26:40 -0600 Subject: Re: [amsat-bb] Fw: Fwd: LVB tracker
Peter,
It isn't shown on the schematic, but elsewhere in the rotator docs (page 5, External Control) it specifies 0-4.5V DC for the position sensing outputs. Depending on the existing interface, a simple voltage divider would probably do. I don't have an LVB tracker, so I can't comment on that end.
73s,
Alan WA4SCA
<-----Original Message----- <From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of W2JV <Sent: Tuesday, February 16, 2016 7:30 PM <To: AMSAT-BB@amsat.org <Subject: [amsat-bb] Fw: Fwd: LVB tracker < < <The Great South Bay, Amateur Radio Club, of which I?m a member wants to put together a satellite <station. <They have an existing home made AZ EL power unit which works. They are looking into interfacing an <LVB tracker with it. <and need to know what voltage level input is required for the feedback loop. The unit currently puts <out 0-6.25vdc corresponding to 0-360 AZ and 0-180 EL. Looking at the G5500 schematic they go <through an opamp arrangement but do not provide any voltage levels. < <If anyone can the club with some info I'd sure appreciate it. < <Thanks, < <W2JV Peter <_______________________________________________ <Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available <to all interested persons worldwide without requiring membership. Opinions expressed <are solely those of the author, and do not reflect the official views of AMSAT-NA. <Not an AMSAT-NA member? Join now to support the amateur satellite program! <Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
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W2JV