[TenTec] Re: hp Z3801A Interface Unit

[Eric F. Richards]

At 07:55 PM 6/9/2003 -1000, you wrote:
>Well..............
>
>This thing has been up and running now for a few hours!
>
>Solution:
>
>Just forget all that 422 to 232 interface stuff,  and all the
>rest!  Simply connect as follows:
>
>On the PC end,  the RS232 connector,  which is almost
>certainly DB9;  and to the RS422 DB25F connector
>on the hp GPS unit connect directly these wires:
>
>PC com port DB9,  pin 2 (Rx) direct to hp DB25F pin 2 (Tx)
>PC com port DB9, pin 3 (Tx) direct to hp DB25F pin 3 (Rx)
>PC com port DB9,  pin 5 (sig gnd) direct to hp DB25F pin 7(gnd)
>
>That's it!  Worked great for me,  immediately after setting up.

That's exactly the configuration I went through, except that I
did the 422 to 232 conversion first.  Too bad I had to learn from
you that all that effort was unnecessary... but glad you're up
and going! :-)


>That is what Bill Jones,  K8CU, calls this, PC to hp GPS
>hook up, his "blow out" connection!  Forget all the differential
>and differing level stuff.  Just do it.  Harms nothing,  and
>most important,  it worked!
>
>See his web site:
>http://www.realhamradio.com/GPS_Frequency_Standard.htm
>
>Anyone want a Telebyte Model 260 422 to 232 Interface
>converter!

Return it and get your C-note back.   Or sell it on E-bay...
or the next hamfest...


>At the moment,  my unit is "locked" onto six GPS satellites,
>and is providing high precision location,  altitude and time
>signals.....hoo,  haw!
>
>Now,  in the morning,  to connect the precise 10 MHz signal
>into my RX-340.

That's the easy part.  just connect a cable from the clock out
to the ext. ref in on the '340.  nothing else needs to be done.
You can even use an el-cheapo radio shack cable for that!
(I didn't, because I figured that RS cable would be radiating
10 MHz RF around the shack, but that's just my cynical side
talking...)

>73,  Jim  KH7M

--
Eric F. Richards
efricha at dimensional.com
"The weird part is that I can feel productive even when I'm doomed."
  - Dilbert