Max 232's invert the polarity. You have to follow with an inverting
gate if the TTL stuff worked.
Brian
On 7/13/2013 00:27, Chris Albertson wrote:
I have a UT+ I bought a TTL-RS232 converter on eBay the converter is built
into a DB-9 socket. It uses male header pins for conniption, the same
kind of pins as on the UT+
Look at item # 330838910970 on eBay. It is almost exactly what I have,
lots of people sell them. It is just the max232 chip but the packaging
looks clean and easy to use.
But as I remember I had to use at least one inverter gate. I forgot why
maybe to drive the PPS or the LED I wanted to add.
I don't have a VE2ZAZ board. I was using the UT+ for NTP server. My next
project is to build a GPSDRO (GPS Disciplined Rubidium Oscillator) I
could likely count the 10MHz output for 10,000 seconds.
On Fri, Jul 12, 2013 at 10:04 AM, Bob Stewart <[email protected]> wrote:
Hi Chris,
Thanks. Our setup is a bit different. My oscillator is the Trimble
34310-T and I'm using an Oncore UT+ receiver board. What are you using for
your RS-232-TTL converter? I'm looking for one that will look relatively
"clean" when I get it mounted on the back of this HP 37203A box.. I'm also
interested in the idea of using a USB-TTL converter, but I haven't seen a
decent one with the square(ish) socket, rather than the rectangular one.
Bob - AE6RV
________________________________
From: Chris Howard <[email protected]>
To: Bob Stewart <[email protected]>; Discussion of precise time and
frequency measurement <[email protected]>
Sent: Friday, July 12, 2013 11:32 AM
Subject: Re: [time-nuts] GPDSO is working
Hi Bob.
My configuration is:
- HP 10811-60111 10 Mhz oscillator
- Trimble Resolution-T GPS card
- VE2ZAZ controller board
- homebrew power supplies
- RS232 switchable between GPS and VE2ZAZ controller
- little e-bay puck GPS antenna on the top of an 8' post outside my
window.
I did get the software for the Resolution-T from the Trimble
site and did a site survey.
My software settings for the VE2ZAZ controller board are:
S: 00E1 (a few seconds more than one hour)
F: 01 (for this osc the fine adj is not useful)
L: B1
H: 10
W: c8
N: 0A
O: 01
X: 02
M: 01
I've had the thing running for about a year.
It took a while to figure out a bad solder joint in
my oscillator that made the DAC voltage ineffective.
Since it's been running right I have had the opportunity
to compare it to a cesium standard and I'm happy.
There is also a mailing list for the VE2ZAZ controller
where you might find more info:
http://mailman.qth.net/mailman/listinfo/gps_standard
Chris
w0ep
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