[aprssig] RC-D710 APRS display head on an old IC-2AT HT

[Robert Bruninga]

> 1)   What is this diagram trying to say? 

Sorry, I had the PG-5J mini-din on there just so I could see
what I was doing in tracing out the same signals as they appear
on the RJ-45 that goes to the RC-D710 Display Head.  Now that
they are traced, I don't need the PG-5J and can just interface
the D710 Display Head to the HT via only the RJ-45 and a clean
source of 9-11 VDC.

> Does the D710 head have a 6-pin Mini-DIN 
> connector on it?  Or is it the RJ-45 plug?  

It's the RJ-45 is all you need.

> (The Mini-DIN pinout looks like the standard 
> used on many Kenwood/Icom/Yaesu radios with 
> the mini-DIN "packet/data" connector on them.)     

Yes, that is why you can plug the RC-D710 APRS display head into
ANY such modern radio and get the full D710 APRS display
functionality on any radio.

> Does this mean a standard mini-DIn-6-to
> mini-Din-6 KVM cable will connect the radio 
> TX/RX/DCD/PTT signals (but not DC power) to 
> the head ?

Yes, and that is all the $80 PG-5J interface is, a connector box
and a 10V regulator.

> > Wow, a handheld D710.
> >
> > I just noticed that the RC-D710 APRS display head has a spec
> > voltage of 9 to 11 volts.  Since 8 nicads would give 8.8 to
11.2
> > volts, I think I will give it a try.
> >
> > 8 NiCd's taped to the back of the Display Head, will let me
use
> > it with any HT (without having to purchase the $80 PG-5J
> > interface which contains the 10 volt regulator) Maybe.
> >
> > Anyone done this?  Here is my schematic I am working on:
> >
> > www.ew.usna.edu/~bruninga/aprs/RC-D710-connx-pwr.GIF
> >
> > Bob, WB4APR
> 
> 
> 
> 
> --
> 
> Stephen H. Smith    wa8lmf (at) aol.com
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