[time-nuts] GN-GGB0710 GPS Antenna Mounting Thread

[Bob kb8tq]

Hi

I’ve had no issues with 5/8-11 going into any of the Chinese antennas so far.  

Bob

> On Feb 14, 2019, at 3:09 PM, Skip Withrow <skip.withrow at gmail.com> wrote:
> 
> 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
> 
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