[amsat-bb] Completion: Re: SatPC32 Antenna Swapping with SDR

[Erich Eichmann]

Hi Tim, a problem with that configuration:  you need access to the pins 
Ground and DTR (pins 5 and 4) of the serial port to steer the buffer 
interface.  To steer your Yaesu radio via the Radio 2 COM port you will 
use  a USB-to-Serial converter + a Yaesu CAT cable, e.g. the CT-62. This 
cable comes with a DB-9 connector on one side  that connects to the 
converter and a mini DIN plug on the other side, that connects to the 
radio.  So, you don't have direct access to the lines Ground and DTR. 
What you could do: Solder a short cable with a female DB-9 connector on 
one side and a male one on the other side. Connect the female side to 
the USB-to-Serial converter and the male side to the DB-9 connetotr of 
the CT-62. With that cable you  can then easily lead out 2 extra wires 
to the Ground and DTR pins to control the interface.

73s, Erich, DK1TB

Am 01.06.2019 um 14:48 schrieb Tim Rife via AMSAT-BB:
> Thanks for the reply Erich.  I will give that configuration a try.
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> 73,
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> Tim
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> KK9T
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> Hi Tim,
> I have described the feature on my websitewww.dk1tb.de  <http://www.dk1tb.de>  , Engl. page 'Downloads', sect. 5g  (Buffer Interfaces).
> You don't need a PC with a phyical COM port. The voltage at the DTR pin of  my USB-to-Serial converter (which generates the Radio 2 COM port) changes between +6 (high) and -6 V (low), when the user switches between  v/u and u/v satellites. The corresponding option in menu 'Options' must be checked, of course.
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> If the DTR pin is low, the buffer interface locks and the relay remains open. If the pin is 'high', the interface is routed and the relay closes. I do not have a transfer relay, but have successfully tested the function with a 12 volt coax relay.
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> 73s, Erich, DK1TB
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