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

Robert Bruninga bruninga at usna.edu
Wed Sep 24 23:42:46 UTC 2008


Hummh...

It doesn't work.  The RC-D710 display head draws about 50 mA for
about 1 sec and shuts down (running on a 1 amp bench supply).
But it works fine when powered from the 10v in the PG-5J
interface.  I have it apart and there is NOTHING in there, but a
10v 3 terminal regulator chip with only 47 uF on the output.

Im stumped.  It must not like the power somehow.  It begins to
pwer up and then decides not to complete the evolution...

Bob
 

> -----Original Message-----
> From: aprssig-bounces at lists.tapr.org 
> [mailto:aprssig-bounces at lists.tapr.org] On Behalf Of Robert
Bruninga
> Sent: Wednesday, September 24, 2008 6:47 PM
> To: 'Stephen H. Smith'; 'TAPR APRS Mailing List'
> Subject: Re: [aprssig] RC-D710 APRS display head on an old
IC-2AT HT
> 
> > 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
> > EchoLink Node:      14400    [Think bottom of the 2M band]
> > Home Page:          http://wa8lmf.com  --OR--
> http://wa8lmf.net
> > 
> > World Digipeater Map
> >   http://wa8lmf.net/APRSmaps
> > 
> > JavAPRS Filter Port 14580 Guide
> >   http://wa8lmf.net/aprs/JAVaprsFilters.htm
> > 
> > "APRS 101"  Explanation of APRS Path Selection & Digipeating
> >   http://wa8lmf.net/DigiPaths
> > 
> > Updated "Rev H" APRS            http://wa8lmf.net/aprs
> > Symbols Set for UI-View,
> > UIpoint and APRSplus:
> > 
> > 
> > 
> > 
> > 
> > 
> 
> 
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