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

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.  - 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@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com -- Este correo electrónico ha sido analizado en busca de virus por el software antivirus de Avast. www.avast.com