[time-nuts] Re: Looking for getting-started info on GPSDO ("Nortel Trimble NTBW50AA-05")

[EB4APL]

Hi,

I have the same GPSDO running continuously for several years, it is the 
10 MHz reference for my home lab.

I enclosed it in a recycled HiFi cabinet and home built a 48 VDC power 
supply. The intensity varies between 320 mA when cold and 150 mA when 
the crystal oven reaches the operating temperature (about 5 minutes), 
this includes the antenna consumption.

I modified the flat cable that goes to the front panel PCB and added a 
second DB-9 connector for the back panel. Both connectors are in parallel.

On the back panel I installed 3 BNC connectors for the 10 MHz, 0.5 PPS 
and the 9.8304 MHz (X8 CHIP, a signal only useful for the cell tower 
operator). and one F connector for the antenna input. I used 4 pigtails 
for connecting the rear mounted connectors to the board which have SMB 
connectors. I bought the pigtails assembled on eBay from China, high 
quality and cheaper that assembling them myself..

I made a modification to have a 1 PPS output because both the 0.5 PPS 
and the X8 CHIP signals were not useful for me. It is really easy:

- Cut the trace between TP 14 and U405 pin 6.

 Â - Solder a wire between TP 14 and TP 33. Now you have 1 PPS on the 
former 9.8304 MHz connector.

The 1 PPS pulse is a 10 uS negative going from +5V to 0V.

Since the 1 PPS is related to the 9.8304 MHz signal it will have a delay 
(540, 440, 340, 240 or 140 nS with respect to the 0.5 PPS signal), it 
depends of which cycle of the 9.8304 MHz signal it locks in. If the unit 
loses lock the delay can be any of these when it locks again.

The power input is on J2, column 1 (all pins) is the negative and column 
4 is the positive.

This is the antenna that I use, I bought it in ebay. For testing you can 
use a "puck" antenna intended for 5V before you find an appropriate one.

I have to find some documentation but I attach some pictures and other 
info. I'll try to find more.

Tomorrow I'll tell you something about configuring this GPSDO. Unless 
you enter your location, it thinks that is on the previous one and never 
will lock. Don't panic.

Regards,

Ignacio EB4APL


El 22/02/2023 a las 21:42, wb0gaz--- via time-nuts escribió:
> A few years back, I picked up a "Nortel Trimble NTBW50AA-05" device along with a mating (multi-pin) power connector TE Connectivity 5100143-1.)
>
> I'd like to put it into service as 10 MHz reference source for my home lab, however, I've not been able find "how to" or getting-started information.
>
> If there's a how-to posted online, I'd be grateful for a pointer/URL.
>
> If not, here are the three main questions:
>
> 1. Pinout and power requirements?
> 2. Antenna requirements (I received a suitable antenna with the unit, but that part is lost so I'll need to source one)
> 3. Any requirement to communicate via RS-232 for configuration/setup?
>
> Thanks very much for any advice/pointers,
>
> Dave
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe send an email to time-nuts-leave at lists.febo.com

-- 
Este correo electrónico ha sido analizado en busca de virus por el software antivirus de Avast.
www.avast.com
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Cabinetfront.jpg
Type: image/jpeg
Size: 206652 bytes
Desc: not available
URL: <http://febo.com/pipermail/time-nuts_lists.febo.com/attachments/20230223/f991a3fb/attachment.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Cabinetreart.jpg
Type: image/jpeg
Size: 235989 bytes
Desc: not available
URL: <http://febo.com/pipermail/time-nuts_lists.febo.com/attachments/20230223/f991a3fb/attachment-0001.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Connectorbottom1a.jpg
Type: image/jpeg
Size: 625937 bytes
Desc: not available
URL: <http://febo.com/pipermail/time-nuts_lists.febo.com/attachments/20230223/f991a3fb/attachment-0002.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Cableharness.jpg
Type: image/jpeg
Size: 198230 bytes
Desc: not available
URL: <http://febo.com/pipermail/time-nuts_lists.febo.com/attachments/20230223/f991a3fb/attachment-0003.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Coaxconn.jpg
Type: image/jpeg
Size: 37852 bytes
Desc: not available
URL: <http://febo.com/pipermail/time-nuts_lists.febo.com/attachments/20230223/f991a3fb/attachment-0004.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: AntenaGPS.jpg
Type: image/jpeg
Size: 111249 bytes
Desc: not available
URL: <http://febo.com/pipermail/time-nuts_lists.febo.com/attachments/20230223/f991a3fb/attachment-0005.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: NTGS50AAinfo.zip
Type: application/x-zip-compressed
Size: 4454356 bytes
Desc: not available
URL: <http://febo.com/pipermail/time-nuts_lists.febo.com/attachments/20230223/f991a3fb/attachment.bin>