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

Robert Benward rbenward at verizon.net
Sun May 23 20:55:21 UTC 2010


All the LEDs light upon POST.


----- Original Message ----- 
From: "Bob Camp" <lists at rtty.us>
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Sent: Sunday, May 23, 2010 4:24 PM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)


> Hi
>
> Sounds like a blown LED (or two...).
>
> I'd hit Linear up for a sample of the converter chip.
>
> Bob
>
>
> On May 23, 2010, at 4:12 PM, Robert Benward wrote:
>
>> Bob,
>> I have an update!  Possibly some good news.  After a few hours of nothing, I unplugged the antenna, and the hold over 
>> light came on!  So something happened, and according to the manual, it must have locked.  Again, the lock light was 
>> not on before the hold over light came on. Looking inside, it has been modified for RS-232.  Looking at he voltages, 
>> it may be fried.
>>
>> Bob
>>
>> ----- Original Message ----- From: "Bob Camp" <lists at rtty.us>
>> To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
>> Sent: Sunday, May 23, 2010 3:20 PM
>> Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
>>
>>
>>> Hi
>>>
>>> You might also be able to go to their web site and hit the "send me a free sample button".....
>>>
>>> If it's a 3801, there's a good chance what you are looking at are RS-422 levels. The previous owner may have simply 
>>> been confused about what he had as a backup.
>>>
>>> Bob
>>>
>>>
>>> On May 23, 2010, at 3:02 PM, Robert Benward wrote:
>>>
>>>> OK,
>>>> It does flash, then it sequences.  I guess that's a start.  I suspect it's been a long time since it's been on, 
>>>> this was the previous owner's spare.  As far as location,  I bought it at the Dayton Hamfest, so it could be 
>>>> anywhere from New York or Pennsylvania, to as  far as the midwest for the last know fix.  Now working on putting up 
>>>> a different GPS antenna.  Even if I get all this working with a new antenna, the RS-232 may be trashed.  At least 
>>>> it's a Linear Technology part, I might even have an exact replacement in the office.
>>>>
>>>> Bob
>>>>
>>>>
>>>> ----- Original Message ----- From: <GandalfG8 at aol.com>
>>>> To: <time-nuts at febo.com>
>>>> Sent: Sunday, May 23, 2010 2:10 PM
>>>> Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
>>>>
>>>>
>>>>>
>>>>> In a message dated 23/05/2010 18:51:55 GMT Daylight Time,
>>>>> rbenward at verizon.net writes:
>>>>>
>>>>> Looking  at al these pictures, I'm beginning to think I have a Z3801A, not
>>>>> a 05A.   After a few hours, the unit still has
>>>>> not  locked.
>>>>>
>>>>>
>>>>> ------------------
>>>>> Bob
>>>>>
>>>>> It's easy enough to tell If you have a Z3801A from rear panel photos, the
>>>>> 3805 has noticeably more outputs.
>>>>>
>>>>> The 3801A  user manual is widely available online and details on  page 1-6
>>>>> onwards what you should expect to see immediately after power up.
>>>>> In particular, it should start with just the power light on then flash the
>>>>> other front panel indicators whilst it performs a self test before just
>>>>> showing  just the power light again whilst it searches for satellites.
>>>>>
>>>>> If you do have a 3801A and you're seeing that sequence then all is probably
>>>>> well, if you see nothing other than the power light then that doesn't
>>>>> sound too  good.
>>>>>
>>>>> The required supply voltage should be marked on the rear panel, some units
>>>>> required Telco voltage of around -54 volts nominal, referenced to ground,
>>>>> others  if I remember correctly required around +27.
>>>>>
>>>>> A schematic for the 3801 PSU is available here..........
>>>>>
>>>>> _http://rapidshare.com/files/249531410/Z3801APSUandOven.zip_
>>>>> (http://rapidshare.com/files/249531410/Z3801APSUandOven.zip)
>>>>>
>>>>> Since there seems now to be some doubt as to which unit you have I would
>>>>> advise sorting that out first.
>>>>>
>>>>> When I first started using 3801s I found communicating with them can  be a
>>>>> right PIA and that can make you doubt your sanity at times let alone the
>>>>> unit itself.
>>>>> Once you've got power and boot up sorted there's a variety of software
>>>>> available but HP's Satstat is more than adequate to get you started.
>>>>>
>>>>> regards
>>>>>
>>>>> Nigel
>>>>> GM8PZR
>>>>>
>>>>>
>>>>>
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>>>>
>>>>
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