[TenTec] HP GPS Receiver

[Eric F. Richards]

At 10:06 PM 6/20/2003 -0400, you wrote:
>After inspecting my serial port mods to the Z3801A, it appears there are no
>operator errors after I made the internal RS-422 to RS-232 mod.
>
>I am using a standard RS-232 DB-9 to DB-25 serial cable (e.g., same as used
>for a dial up modem).

You need a null-modem cable, not straight through.  Ironically, because
the wire assignments for pins 2 and 3 are reversed on a DB9 as compared
to a DB25, you connect pins 2 and 3 together.  A "straight through"
connection is really a crossover (null-modem) cable!

>On AD6A's web page he suggested only connecting the
>essential pins which comprise three connections...

That's fairly important since other pins on the GPS have signals on
them that are probably seriously incompatible with RS232. Maybe it's
okay, maybe not.  I wouldn'r risk it.


>and similar to Jim's mod
>while leaving the serial port configured for RS-422.
>
>Question: Has anyone else had trouble communicating with their Z3801A units
>while using a standard RS-232 serial cable after making the internal serial
>port mod?  Just to keep this on-topic, we are discussing the external
>frequency reference to the Ten Tec RX-340 receiver.  Thanks.

I made one custom cable and tried duplicating it with commercial cables.
It ended up looking like a real mess, with a straight-through cable, a
null-modem adapter, and a breakout box with 2, 3, and 7 the only lines
that went through.

Since the second one was a temporary installation, I didn't mind so much.



>-Paul, W9AC


Good luck,

Eric, KB0YDN


>----- Original Message -----
>From: "Jim Reid" <jimr.reid at verizon.net>
>To: <tentec at contesting.com>
>Sent: Friday, June 20, 2003 20:54 PM
>Subject: Re: [TenTec] HP GPS Receiver
>
>
> >
> >
> >
> > > I have my HP Z3801A installed with SatStat but I cannot seem to find
> > the
> > > references to the COMM port settings.  Can someone please come to my
> > rescue?
> >
> > Paul,
> >
> > Right at the top of the SatStat screen is an item called,
> > "Com port";  it is right next to File and Edit up there.
> > Click on that,  then click on Settings,  and there is all
> > the needed stuff.  Note that when you "minimize" the
> > main window,  another window appears called, "Control
> > and Query"  Click on the item at the top called, "Control"
> > and in that drop down click on "survey",  and the unit
> > is off to find satellites and its' own place in the world.
> >
> > Oops,  after you have the Com Port settings correct,
> > don't forget to click on the item called Open Port,  hi.
> >
> > 73,  Jim  KH7M
> >
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec at contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
>
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--
Eric F. Richards
efricha at dimensional.com
"The weird part is that I can feel productive even when I'm doomed."
  - Dilbert