[time-nuts] 9390 GPS RX

[Mark C. Stephens]

Hello Mr. Dent,


The problem is, Vintage kit like this is virtually impossible to get down here in Australia.
That's why I was tickled pink when I got my hands on it.

Does the 9390-5588A have the 16.618 Mhz Vectron oscillator externaly located on one of the wire wrap boards?

As days go by I have a PSU fault, A GPS receiver fault, The dates wrong and the FRK is possibly knackered and I need my workbench back.
I just wonder it it's time to put everything back together and shelve this 9390 as a retirement project.
With a bit of luck GPS will be replaced with something else by then ;)

I have a Austron 2201a in absolute pristine condition with service manuals for its serial number no less!
However, 2 Problems, I have no Antenna Down convertor and its stuck in a reboot loop:
Testing RAM
Testing ROM
Testing something else
Testing failsafe ... Can't read it all as she reboots almost the instant it written to the display.
I could spend time on the Austron, It has a Rubidium in it too.
But not for love nor money can I get an antenna for it.
I have a saved worldwide search on ebay.com for one but I have a feeling that when one does come up it will go for megabucks.
I have put word out to all the packrats I know down under and so far no luck there either.

Boo hoo!


mark


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Arthur Dent
Sent: Saturday, 25 May 2013 1:22 AM
To: time-nuts at febo.com
Subject: [time-nuts] 9390 GPS RX

I have owned a similar 9390-5588A with the FRK Rb inside for a few years now. Although the Rb is quite old, the unit locks in just 3 minutes and finds the GPS time (off by 1024 weeks, 16 sec, UTC) in four minutes and displays an initial PDOP 03. I have reset the time to the correct UTC time but after a short period it always reverts to the original time. If I recall the antenna voltage was +12vdc and I traced the line and reconnected it to +5vdc. The antenna is roof mounted and runs through a Lucent GPS ant amp/5-way splitter. 
I don't recall which ones it was now but I did have a problem with
2 of these old GPS receivers on the same antenna, apparently reradiating enough of a signal from the LO or whatever so that it knocked the other receiver off line.

My version of this vintage 9390 has an added switch on the front to choose where it gets the 1PPS signal to compare and it has both an a.c. and a d.c. supply. From what I have seen almost no 2 of these units were exactly the same so it is hard to find an exact manual and I don't have one at all so it made setting this unit up kind of difficult. The circuit boards directly in front of the FRK use wire-wrap connector so they could customized these units for each end-user. 

-Arthur
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