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

[Ed, k1ggi]

Point of clarification, on a PC RS-232 port, expect to find TxD (output) on
pin 2 of a 25-pin D-sub, and on pin 3 of on a 9-pin D-sub. 

This is a sign of terminal configuration (DTE), and a PC is conventionally a
terminal. It would be surprising if your PC isn't.

If you don't have a scope, a dc measurement can help clear the air. The
resting state of the PC RS-232 TxD pin will be a negative voltage, expect
anywhere between -5 and -12 (beyond that would be a little surprising).
Easily measured because you can get right on the male pins. The RxD pin wont
have much if any on it compared to the TxD. A RS-422 pin should generally
not measure negative at all.

Don't know the Z38xx family, but my tbolt is DCE, and hooks up with a
straight 9-pin cable, which is very convenient as it can be a neat molded
straight extension cable or mass-terminated ribbon. For this, you need to
find negative resting TxD on pin 2 (so it goes to RxD on the PC).

The original Mac had RS-422 (unipolar differential) characteristics that a
lot of folks successfully wired directly to RS-232 (bipolar singe-ended),
driving one of the differential RxD pins and choosing the right polarity of
TxD. Success is mainly a matter of polarity, thresholds, length, and noise
margins.

Do the Z- boxes look for hardware handshaking?

Ed

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of jmfranke
Sent: Saturday, May 22, 2010 5:04 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)

Have you looked at the serial connector with an oscilloscope?  Pin 2 should 
be the output data.  Pin 3 is for data going into the GPS.  And pin 7 is 
ground.  I use Z3801A systems which have a 25-pin connector.  Other systems 
use a 9-pin serial connector.  The only difference should be the ground 
which is on pin 5 for the 9-pin connector.  Have you looked at:
http://www.realhamradio.com/GPS_Frequency_Standard.htm

John  WA4WDL

--------------------------------------------------
From: "Robert Benward" <rbenward at verizon.net>
Sent: Saturday, May 22, 2010 3:07 PM
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Subject: Re: [time-nuts] Z3805 utility, Was: AW:  (no subject)

> Hi All,
> I hooked everything up and I still get nothing.  I can't seem to establish

> communications  with the Z3805.  I tried a null modem as well, in case the

> cable (supplied) was wired with the wrong connector gender.  I see a green

> blinking light inside, it he left rear corner of the box.  Everything is 
> warm, but nothing else.  Any ideas?
>
> Bob
>
>
> ----- Original Message ----- 
> From: "Robert Benward" <rbenward at verizon.net>
> To: "Discussion of precise time and frequency measurement" 
> <time-nuts at febo.com>
> Sent: Saturday, May 22, 2010 9:49 AM
> Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
>
>
>> Hi Ulrich,
>> Thank you for your response.  I hope to try it today if I can get away 
>> from household duties.  Will I need to leave the computer hooked up, or 
>> will it run stand alone once I set it up?
>>
>> Thanks,
>> Bob
>>
>>
>> ----- Original Message ----- 
>> From: "Ulrich Bangert" <df6jb at ulrich-bangert.de>
>> To: "'Discussion of precise time and frequency measurement'" 
>> <time-nuts at febo.com>
>> Sent: Saturday, May 22, 2010 5:50 AM
>> Subject: [time-nuts] Z3805 utility, Was: AW: (no subject)
>>
>>
>>> Bob,
>>>
>>> everything you need for the Z3805 is included in my Z38XX utility, that 
>>> has
>>> already been mentioned. This includes sending commands to the receiver, 
>>> you
>>> do not need another terminal program. I own a Z3805 myself and basically

>>> I
>>> have written the software for myself. A Z3801 manual in conjunction with
>>> Z38XX should take you pretty far in either get it to run or otherwise
>>> diagnose a fault.
>>>
>>> Best regards
>>> Ulrich Bangert
>>>
>>>> -----Ursprungliche Nachricht-----
>>>> Von: time-nuts-bounces at febo.com
>>>> [mailto:time-nuts-bounces at febo.com] Im Auftrag von Robert Benward
>>>> Gesendet: Samstag, 22. Mai 2010 03:15
>>>> An: time-nuts at febo.com
>>>> Betreff: [time-nuts] (no subject)
>>>>
>>>>
>>>> Hi,
>>>> I just purchased a Z3805A at the Dayton hamfest this past
>>>> weekend.  How do I
>>>> get it to work?  Do I need software to run this, or can it
>>>> run stand alone.
>>>> I have turned it on, but only the power light comes on, the
>>>> GPS lock, and
>>>> more importantly, the enable light is not on.  There is an
>>>> 10MHz output, but
>>>> the holdover light is not on.  Is there any freeware available?  Any
>>>> recommendations?
>>>>
>>>> Any opinions on this one:
>>>>
>>>> http://cgi.ebay.com/GPS-Receiver-Program-HP-Z3801A-Z3805A-Z381
>>>
6A-58540A-/250566043297?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item3a56e666
>>> a1
>>>
>>> Thank you in advance.
>>>
>>> Bob
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