[time-nuts] 9390 GPS RX

Mark C. Stephens marks at non-stop.com.au
Fri May 31 12:04:46 EDT 2013

Hi Arthur, There is quite a difference between the models alright.

Mine has the PSU, the Dc convertors the same as the 1st link.
It has the logic board of the second..
But The Control panel is much, much earlier.

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Arthur Dent
Sent: Friday, 31 May 2013 10:26 PM
To: time-nuts at febo.com
Subject: [time-nuts] 9390 GPS RX

On May 24th Mark C. Stephens asked:
"Does the 9390-5588A have the 16.618 Mhz Vectron oscillator externaly located on one of the wire wrap boards?"

Well I had to dig it out and open it up to see. Actually I mispoke when I said my 9390 had an FRK, it turned out that was another unit I was thinking of, this 9390 has an FRS-C dated 1994. I have a photo link to the innards of that 9390 and it doesn't appear to have a seperate osc like 2 of my older 9390s. I will say that other than the time display having the 1024 week error that this 9390 works quite well.

An older 9390 I have isn't as high as the one you have but has the same height circuit boards mounted at an angle so they would fit into the smaller chassis. That unit has the somewhat standard 16.368Mhz OXCO with cable going to the receiver board. Power supply problems in this 9390 just like yours except this p.s. is a sealed unit.

The oldest unit I have is a much higher unit and has larger circuit boards and lots of interconnecting cables and that one has never worked and maybe some day I'll get a chance to look at it but as a practical matter it probably isn't worth the effort. The link below has a photo of the oldest big 9390 and to the left of it you can see the height of the 9390 with the slanting circuit boards. 

As I said it appears that the 9390 model number covers a wide range of different configurations, styles, and dates and they were almost all one of a kind units. This makes getting a manual for a particular unit difficult. 

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