[aprssig] Re: APRS Standard Connectors?
bruninga at usna.edu
Wed Nov 30 08:09:27 CST 2005
20 years ago we were all using the TAPR-2
5 pin DIN connector as the audio standard.
I made all my patch panels match it.
But nothing beats the "DB" series for solderabiilty.
So I like K6DGB's suggestion below. The KPC-3 DB-9 for
audio and the PC (AT) serial port DB-9 series for
GPS interfaces. I like the addition of +5 and +12
on separate pins!
TNC or Interface device (not radio end):
DB series 9 pin Female on chassis, Male
1 TX Audio
2 (XCD input)
4 (ctrl-B or analog input)
5 RX audio
7 Power Input
8 (ctrl A or analog input)
Many GPS devices expect to be plugged into
a PC, so they have a DB-9 series female on
the end of their cables. So the standard APRS
GPS connector could be:
2 Serial GPS data to PC
3 Serial data to GPS
4 Power 12 volts
7 (RTS) Suggested 5 Volts Power?
Notice that Chris suggested pin 8 for 5V power,
but since the PC is the DTE and the GPS plugged
into the serial port is the DCE, then I think the
PC should output the 5 volts on pin 7 which is
an output from the PC and not pin 8 which is
normally an input to the PC. Did I get that right?
>>> cak at dimebank.com 11/30/05 12:29 AM >>>
Standard connectors? To what? From what?
There doesn't seem to be any hope of a standard connector set at the
radio end; I've given up on that. When I modify an old radio to
bring connections out, I use the Kantronics DB-9 'standard'.
That's very convenient because the OpenTracker/TinyTrak world
has adopted it. Put the cap/resistor network for your HT's PTT in
the DB-9 shell so you can eventually connect another radio to
the device without having to restore the missing resistor.
At the GPS end, I use a DB9 again. The OT/TT folks put +12V on pin
4. I needed +5, didn't want the chance of misconnecting and didn't
want to count on putting a regulator in the device's shell, so I
put +5V on pin 8. I declare that the new APRS standard. :-)
For random power connections, I use PowerPoles. But Anderson doesn't
really supply a very good solution for chassis mounting them, which
still boggles my mind. (You can get pairs, or quads, but a single
connection requires a whole lot of fiddling to do well with the
little retainer plates.) Not to mention that they're not particularly
robust or dustproof. I liked the Molex 'standard' power connector
The coaxial power connectors are fairly horrible if you need
more than 1A; some of them are rated at 0.5A. That's not
very much power (not even enough to transmit 5W). Someone already
mentioned the problem with shorting during connect/disconnect.
The great thing about standards is that there are so many to
73 de chris K6DBG
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