Hi Jeff,
Understood, having worked with cables of all sorts I always found that word
"straight through" to be a little tricky.
Bjorn asked if this was my first GPSDO, the answer is yes. As far as comparison standards, I have an E1938, which I
have compared to a HP3586C. That of course (using the counter) is only good to 10E8. The 3801 is putting out 10MHz,
the only question is the accuracy. Compared to the E1938, it was off 1 cycle every 3-4 seconds (lissajous, 1 rotation
every 3-4 sec). That should put it around 3E-8, but of course I still don't have any traceability beyond 10E-8.
I will try that program you suggested, but again, the voltages I'm getting are
not right.
Bob
----- Original Message -----
From: "Jeff Hook" <jeffh...@comcast.net>
To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com>
Sent: Sunday, May 23, 2010 7:09 PM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
Bob,
Serial ports have always been tough to get working right.
I guess I shouldn't call a serial cable, a straight cable.
I just want to differentiate it, from a null modem cable.
I made up my own cables when I got my Z3805A's
9pin on computer end and 25 pin on 3805
I wired 2-2, 3-3, and 5-7 and it worked.
Their is also a program called GPS-dos2 that you can download from
http://www.realhamradio.com/gps-satstat-software.htm
It runs thru all baud rates, trying to communicat with the 38xx
You could give that a try.
Jeff
----- Original Message -----
From: "Robert Benward" <rbenw...@verizon.net>
To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com>
Sent: Sunday, May 23, 2010 4:41 PM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
Jeff,
A plain serial cable will have 2&3 swapped, a "straight through" is 2-2 and 3-3. There were a lot of DB25 to DB25
that were NOT serial cables, they were just 25 pin cable using DB9.
Bob
----- Original Message -----
From: "Jeff Hook" <jeffh...@comcast.net>
To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com>
Sent: Sunday, May 23, 2010 5:24 PM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
Receive data is pin 2 on DB9 and 3 on DB25
Transmit data is Pin 3 on DB9 and 2 on DB25
A straight thru cable with DB9 on one end and DB25 on the other will have pins
2 and three crossed
A null modem cable, that is required for a Z3805A, will be pin 2 to pin 2 and
pin 3 to pin 3
Jeff
----- Original Message -----
From: "Stanley Reynolds" <stanley_reyno...@yahoo.com>
To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com>
Sent: Sunday, May 23, 2010 3:56 PM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
----- Original Message ----
From: Jeff Hook <jeffh...@comcast.net>
To: Discussion of precise time and frequency measurement <time-nuts@febo.com>
Sent: Sun, May 23, 2010 12:42:45 PM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
Bob
My 3805 cables look like this
DB9 DB25
2 2
3 3
5 7
(Null Modem)
Jeff
<snip>
straight cable is 2 to 2 to 3 to 3
null modem would be
2 3
3 2
normal usage would be:
terminal (straight cable) modem (phone line) modem (straight cable) computer
computer (straight cable) modem (phone line) modem (straight cable) computer
or if no modems :
terminal (null modem) computer
As has been mentioned many exceptions to the rule.
Stanley
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