[time-nuts] 1" 14 tpi UNS die

Robert Atkinson robert8rpi at yahoo.co.uk
Tue Jul 7 20:13:58 UTC 2009


Hi Dave,
I was curious that BSP did not fit. I just grabbed some hardware to try. A 3/4 BSP blank just fitted a Trimble pallisade but not the female end of a Shakespeare short mast. The trimble spec says 1-14TPI or 3/4NPT. It is looser on the shakespeare thread (1-14). I guess it has a thread cut for either and your antenna it 1-14 only. A 3/4-BSPT might fit but a marine mount might be best. I whish I still had access to the CNC lathe at my last employers. It would only take a few minutes to knock some up from 30mm hex bar!

--- On Tue, 7/7/09, David C. Partridge <david.partridge at dsl.pipex.com> wrote:

> From: David C. Partridge <david.partridge at dsl.pipex.com>
> Subject: Re: [time-nuts] 1" 14 tpi UNS die
> To: "'Discussion of precise time and frequency measurement'" <time-nuts at febo.com>
> Date: Tuesday, 7 July, 2009, 7:10 PM
> As it would appear to an expensive
> option to purchase the appropriate dies
> "over here", and as the pipe is soft alloy, I've just
> reduced its diameter a
> bit so it's an tight push fit in the antenna base (for now)
> - though still
> hoping to find a good solution with spending lots of dosh!
> 
> Thanks to all
> Dave 
> 
> -----Original Message-----
> From: time-nuts-bounces at febo.com
> [mailto:time-nuts-bounces at febo.com]
> On
> Behalf Of GandalfG8 at aol.com
> Sent: 07 July 2009 18:54
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] 1" 14 tpi UNS die
> 
>  
> In a message dated 07/07/2009 18:43:55 GMT Daylight Time,
> Arnold.Tibus at gmx.de
> writes:
> 
> I have  the same problem with several GPS antennas, a
> Quadrifilar from
> Raytheon, Irvine 2640NW with mounting base, HP 58532A with
> mounting base, HP
> 58504Ac. etc. Some complete boxes from HP do contain an
> adapter.
> So this  thread is definitively a kind of standard.
> The thread is fully
> cylindrical,  all the plumbers tubes do use conical
> threads which are not
> compatible.  Very difficult to find proper solution in
> the metrical Europe.
> If I would  find a source of that HP-adapters I would
> buy 4 units.
> I did not check for  the correct naming of this thread
> though.
> 
> 
> ---------------
> As commented previously, this is a common fitting and
> fairly standard  for
> GPS antennas and some other antenna kit, especially in a
> marine
> environment.
>  
> A variety of adaptors is available from marine suppliers
> ranging from
> expensive stainless steel fittings to much cheaper plastic,
> they are also
> regularly listed on Ebay.
>  
> However, there doesn't seem to be anything readilly
> available  which has a
> collar to sit over a plain pipe, which I suspect
> might  meet David's needs.
> They are widely available with a flange fitting, for
> mounting to flat
> surfaces, or rail fittings to attach to horizontal deck
> rails, but perhaps a
> trawl through some of the marine suppliers might throw up
> something else
> that could do the job without the need for threading the
> end of the pipe.
>  
> regards
>  
> Nigel
> GM8PZR
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