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

GandalfG8 at aol.com GandalfG8 at aol.com
Sun May 23 18:10:20 UTC 2010

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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