[time-nuts] Z3805 utility, Was: AW: (no subject)
lists at rtty.us
Sun May 23 19:20:33 UTC 2010
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.
On May 23, 2010, at 3:02 PM, Robert Benward wrote:
> 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.
> ----- 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.
>> 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..........
>> 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.
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