[time-nuts] Z3805 utility, Was: AW: (no subject)

Robert Benward rbenward at verizon.net
Sun May 23 23:32:25 UTC 2010


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" <jeffhook at comcast.net>
To: "Discussion of precise time and frequency measurement" <time-nuts at 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" <rbenward at verizon.net>
> To: "Discussion of precise time and frequency measurement" <time-nuts at 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" <jeffhook at comcast.net>
>> To: "Discussion of precise time and frequency measurement" <time-nuts at 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_reynolds at yahoo.com>
>>> To: "Discussion of precise time and frequency measurement" <time-nuts at 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 <jeffhook at comcast.net>
>>> To: Discussion of precise time and frequency measurement <time-nuts at 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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>>
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>
>
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