Hello Time-Nuts, As I have been playing with some dual-band GPS receivers, I decided to order a dual-band antenna to replace my permanent L1 antenna that I use for all the GPSDOs. I purchased one of the Chinese TOPGNSS model GN-GGB0710 units. Much smaller than the choke ring I currently have up (which uses a 1"-10TPI thread).
However, when I went down to the local hardware emporium to acquire parts to assemble a mounting bracket I seem to have run into an issue. A 5/8"-11 bolt appeared to be about right for the mounting threads, but bound after a turn or two. So, I went over to the metric section and found an M16-2 bolt. It started easily enough, but again bound after a couple of turns. Back home I measured the thread pitch and got .08175 inches. Turns out this is between the 5/8-11 thread (.0909") and the M16-2 thread (.0787"). I looked up the Trimble antenna mounting specs and they specify 5/8-11 for their geodetic survey antennas. Since the 5/8 hardware is a lot cheaper than the M16 I'll probably just use a 5/8 bolt and just screw it on reasonably tight and call it a day. Just wanted to give the list a heads-up. If there is a secret mounting thread out there please let me know. Thanks, Skip Withrow _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
