Also, as I have found, some plastics don't just delay but actually absorb the signal.
David N1HAC On 9/6/19 2:28 PM, Bob kb8tq wrote: > Hi > > The gotcha with putting anything on top of a GPS antenna is that it impacts > the phase > shift from the sat’s. How important that is gets quickly into just how picky > you happen to be. > > Bob > >> On Sep 6, 2019, at 11:07 AM, Nick Sayer via time-nuts >> <[email protected]> wrote: >> >> I’m late to the party, but my go-to antenna is the Gilsson marine antenna. >> If it has a downside, it’s that it has a flat top instead of a cone. I’ve >> got one mounted outside at our vacation home near Lake Tahoe, so we’ll see >> whether snow loading becomes a problem shortly. The fix would presumably >> just be a 3D printed plastic gnome’s cap, though even that might not be >> useful if we get snow like we did last year. >> >> It has a standard 14 tpi 1” standard thread, though I’ve managed to make do >> on more than one occasion with 3/4” NPT. >> >> Under normal circumstances, I routinely get 8 or more satellites with the >> top SNRs in the 50s. >> >> I designed a 3D printed mount for mounting it on a flat surface (which I >> needed to do here): >> https://nam05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.thingiverse.com%2Fthing%3A3664978&data=02%7C01%7Cdavid.g.mcgaw%40dartmouth.edu%7Cf3faa3a2e9ed46ead3fb08d732fc9785%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C637033932771963548&sdata=IHu%2Fco9fp3KRNuoi0NNUBqR8dyWAw6rKl8Bpr8m0Gl8%3D&reserved=0 >> >> <https://nam05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.thingiverse.com%2Fthing%3A3664978&data=02%7C01%7Cdavid.g.mcgaw%40dartmouth.edu%7Cf3faa3a2e9ed46ead3fb08d732fc9785%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C637033932771963548&sdata=IHu%2Fco9fp3KRNuoi0NNUBqR8dyWAw6rKl8Bpr8m0Gl8%3D&reserved=0>. >> >> >> >>> On Aug 30, 2019, at 11:35 AM, Denny Page via time-nuts >>> <[email protected]> wrote: >>> >>> Could be. They sell a aluminum mounting rod for use with a magnetic base >>> which mates with the unit perfectly, so I sorta assumed it was intentional. >>> Tapering helps prevents over tightening / over extension which could damage >>> the casing. >>> >>> Denny >>> >>> >>>> On Aug 30, 2019, at 10:49, Bryan _ <[email protected]> wrote: >>>> >>>> Or a mfg. defect and thus why on the surplus market. >>>> >>>> -=Bryan=- >>>> >>>> ________________________________ >>>> From: time-nuts <[email protected]> on behalf of Denny Page >>>> via time-nuts <[email protected]> >>>> Sent: August 29, 2019 7:39 PM >>>> To: Discussion of precise time and frequency measurement >>>> <[email protected]> >>>> Cc: Denny Page <[email protected]> >>>> Subject: Re: [time-nuts] GPS Antennas >>>> >>>> I think several people have run into that issue, including myself. It >>>> seems designed for a slightly tapered rod. Easy to fix with the right tool. >>>> >>>> Denny >>>> >>>>> On Aug 29, 2019, at 16:41, Ben Hall <[email protected]> wrote: >>>>> >>>>> Only issue with mine was that the thread wasn't fully cut, so I modified >>>>> an old taper tap to be a bottoming tap with the bench grinder and >>>>> finished tapping the hole to the bottom. >>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://nam05.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.febo.com%2Fmailman%2Flistinfo%2Ftime-nuts_lists.febo.com&data=02%7C01%7Cdavid.g.mcgaw%40dartmouth.edu%7Cf3faa3a2e9ed46ead3fb08d732fc9785%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C637033932771973545&sdata=yFIp1EQIDNQfOuqkyUAIY2QjSq4yNYMmrt6wi%2Bdu21M%3D&reserved=0 >>> and follow the instructions there. >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://nam05.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.febo.com%2Fmailman%2Flistinfo%2Ftime-nuts_lists.febo.com&data=02%7C01%7Cdavid.g.mcgaw%40dartmouth.edu%7Cf3faa3a2e9ed46ead3fb08d732fc9785%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C637033932771973545&sdata=yFIp1EQIDNQfOuqkyUAIY2QjSq4yNYMmrt6wi%2Bdu21M%3D&reserved=0 >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://nam05.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.febo.com%2Fmailman%2Flistinfo%2Ftime-nuts_lists.febo.com&data=02%7C01%7Cdavid.g.mcgaw%40dartmouth.edu%7Cf3faa3a2e9ed46ead3fb08d732fc9785%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C637033932771973545&sdata=yFIp1EQIDNQfOuqkyUAIY2QjSq4yNYMmrt6wi%2Bdu21M%3D&reserved=0 > and follow the instructions there. _______________________________________________ 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.
