Electronics > Projects, Designs, and Technical Stuff
Symmetricom TrueTime XL-DC changing antenna volatge
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DaJMasta:
Could be in parallel like with resistors for more power handling, but yes, probably worth buzzing out some traces and IDing any connecting parts to be sure.
ZigmundRat:
I have the info that shows the jumpers that need to be changed. ‘Jumpers’ in this case is zero ohm resistors etc that need to be moved. I’ve done this change myself and I don’t recall there being much more to it than that. I’ll post an update tomorrow night.
zener:
Thanks, that info would be really helpful.
ZigmundRat:
Sorry it took so long. Here's the jumper info (attached). In hindsight I should probably just have referred you to an earlier thread on the XL-DC. It's at https://www.eevblog.com/forum/projects/symmetricom-truetime-xl-dc-gpsdo/ .  In that thread @pacAir included some useful scans of other manual pages which include the jumper locations. I also posted pics of the downconverter receiver board in that thread. There are distinct differences between it and the normal receiver - if you have any doubts you can compare them to what you have.

As an aside, I did find that having the antenna voltage at 12V can be useful. My earlier GPS signal distribution method used a DBS splitter and a DBS inline preamp.  But these don't work well at 5V, they work much better at 12V. That arrangement worked well for quite some time. If you've only got the one receiver then 5V will probably be the better choice.

Have fun with the XL-DC. They still do a good job even though they are kind of vintage at this point.
zener:
I made the changes and it is working great.   I just moved the zero ohm resistor from one set of pads to the other.
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