[amsat-dc] Re: wanted: to borrow or buy a Yaesu G-5500 AZ-EL controller and rotor

David Bern David.Bern at engineer.com
Sun Jun 2 03:51:56 PDT 2013


Correction: I told them that hardware comes and goes but software is 
forever.


On 06/02/2013 06:03 AM, David Bern wrote:
> Louie:
>
> All good ideas.  The Raspberry Pi or BeagleBone Black little Linux 
> computers gives us the possibility of running a tracking program such 
> as predict
>
>     http://www.qsl.net/kd2bd/predict.html
>
>
> or gpredict
>
>     http://gpredict.oz9aec.net/
>
>
> in addition to a protocol converter.  I especially like the idea of 
> controlling a telescope drive.  This project could be useful to 
> astronomy buffs.
>
> I am teaching my students a software engineering principle that it is 
> valuable to be as generic as possible; that is, to be platform 
> agnostic and protocol agnostic.  It is a more work in the short-term 
> but the benefits are huge in the long-run.  I told them that hard 
> comes and goes buy software is forever.  On Thursday, I told them, for 
> example, that the initial version of a protocol converter would take a 
> protocol in and then produce the same protocol out: to really 
> understand a protocol, you need to be able to read and write the 
> protocol.  We dubbed this a "null" protocol converter and it should do 
> nothing correctly, i. e. bits in and the same bits out.  The plan is 
> to implement a "null" protocol converter for the DiSEqC and the 
> EasyComm protocols that we are learning.  Once we have these two null 
> protocol converters working then we have the pieces to easily 
> configure a DiSEqC to EasyComm protocol converter.
>
> David, WL2NX
>
>
> On 06/01/2013 10:04 AM, Louis Mamakos wrote:
>> Perhaps this might be of help:http://gatorradio.org/Manuals/Yaesu_GS-232B_Manual.pdf
>>
>> It might be cool to build the controller around an inexpensive Raspberry-Pi or BeagleBone Linux controller that has an ethernet interface available.  You could export a simple REST-based HTTP API, as well as emulating the Yaesu serial protocol over a TCP connection.  A simple HTTP API might make testing easier, perhaps.  You could easily return status and debugging information if you used an extensible encoding format like JSON.
>>
>> For bonus points, you could also implement the Meade or Celestron serial protocol to be able to drive the rotor like it was a telescope mount from various astronomy-oriented programs that might be useful for locating the moon, Jupiter or tracking satellites.  It would be a shame to build something new a modern and saddle it with only an ancient serial protocol that might not be the best choice for today.
>>
>> Just a thought.
>>
>> louie
>> wa3ymh
>>
>> On May 31, 2013, at 10:50 AM, David Bern<David.Bern at engineer.com>  wrote:
>>
>>> Friends:
>>>
>>> I am working on a summer project with students at Montgomery College, Rockville.  The project is to design and build a device that controls a pair of inexpensive satellite TV rotors.  And the device would emulate a popular AZ-EL rotor such as a Yaesu G-5500 AZ-EL controller so it can be used by a satellite tracking program such as SatPC32.  Tom, K3IO suggested this project at the last AMSAT-DC workshop and is guiding us with this project.
>>>
>>> I would like to borrow a Yaesu G-5500 AZ-EL controller and rotor for about three months or buy a used one so we can study and understand its command protocol.
>>>
>>> I will pick up or pay for shipping.  Please contact David, W2LNX directly at
>>>
>>>    W2LNX at amsat.org
>>>
>>>
>>> Thank you,
>>> David, W2LNX
>>> _______________________________________________
>>> Via the AMSAT-DC mailing list courtesy of AMSAT-NA
>>> AMSAT-DC at amsat.org
>>> http://amsat.org/mailman/listinfo/amsat-dc
>



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