[time-nuts] Datum 1000B OXCO

Stanley Reynolds stanley_reynolds at yahoo.com
Tue Jan 20 20:49:43 UTC 2009


Not sure why my email to this list is lost or delayed but some does get thru.

Working on a parts list and circuit diagram for the FTS 1000 which can be found here:

www.n4iqt.com/fts1000b

Stanley


 



________________________________
From: Stanley Reynolds <stanley_reynolds at yahoo.com>
To: time-nuts at febo.com
Sent: Tuesday, January 20, 2009 11:20:28 AM
Subject: RE: [time-nuts] Datum 1000B OXCO






----- Forwarded Message ----
From: Stanley Reynolds <stanley_reynolds at yahoo.com>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Monday, January 19, 2009 5:16:51 PM
Subject: Re: [time-nuts] Datum 1000B OXCO


My control voltage is adjustable from 0 to 12 positive volts maybe in this application no negative supply ? 

Yes it has the external pot but in this package FTS-4040 the 5030 assembly's long side is from side to side not front to back like the FTS-4060. So the external adjustment is on the left side. 

I have two 5030's on the way, hope they are the 5 Mhz version 1000B not the 10 Mhz OCXO.

I could use a substitute 5 Mhz OCXO and the main board from my broken 1000B to get the two outputs I need but that would be a less desirable option.

Started a schematic of the oven circuit see attached bit map file, easy traces done the hidden parts yet to do.

Stanley




________________________________
From: Corby Dawson <cdelect at juno.com>
To: time-nuts at febo.com
Sent: Monday, January 19, 2009 10:46:37 AM
Subject: Re: [time-nuts] Datum 1000B OXCO

Hi,

The data sheet for the 1000B is available on the Symmetricom website.

The pinout is not given.

Here is the pinout.

1- Electronics return
2- Control voltage in -10 to +10 VDC
3- Coarse tune in voltage
4- +12VDC reference out, coarse tune hot
5- Oven return
6- Oven monitor
7- +24VDC oven power
8- +24VDC electronics power
9- Case ground

On some units the internal coarse control is disabled and the pot is
brought out to the instruments rear panel to allow adjustment without
disassembling the unit!

You can tell if this is the case  if wires are connected to the
mainframes connector on pins 1 3 and 4 and finding the pot at the other
end.

These 1000B have pins 3 and 4 as shown.

In this case pins 1 and 4 connect across the pot and the wiper goes to
pin 3. The pot on the 1000B will not have any effect.

Hope this helps.

Corby Dawson
<snip>


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