Hi All, For the second summer in a row we were smacked with lightning. So I'm in need of a new GPS antenna. Might as well look for one with multi band units. I recall some talk about the cheap multi-band units on ebay that that are compatible with the f9P modules. Can anyone report back how they worked out? The link from a while back is as follows: https://www.ebay.com/itm/CORS-RTK-GNSS-Survey-Antenna-high-gain-measurement-GNSS-GPS-GLONASS-BDS/253786590956 Thanks! Dan

Hi Dan, I bought two of these, one from “Top GNSS Store” and the other from “GNSS Store” Bit of a delay getting the first one, about 40 days, but the second one arrived in about 15 days. Both have worked well. Note that I don't a multi-band unit yet. I posted some pics a while back of the total geek-out job my contractor did mounting the thing. Denny > On Aug 29, 2019, at 09:59, Dan Kemppainen <dan@irtelemetrics.com> wrote: > > Hi All, > > For the second summer in a row we were smacked with lightning. So I'm in need of a new GPS antenna. Might as well look for one with multi band units. I recall some talk about the cheap multi-band units on ebay that that are compatible with the f9P modules. Can anyone report back how they worked out? > > The link from a while back is as follows: > https://www.ebay.com/itm/CORS-RTK-GNSS-Survey-Antenna-high-gain-measurement-GNSS-GPS-GLONASS-BDS/253786590956 > > Thanks! > Dan > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there.

On 8/29/2019 11:59 AM, Dan Kemppainen wrote: > I recall some talk about the cheap multi-band units on ebay that > that are compatible with the f9P modules. Can anyone report back how > they worked out? I'm very happy with the one I bought and received from that seller. Haven't tried it with an F9 yet, but the M8T's, TruePositions, NTPi, and Blitzortung System Blue all work very well on it via my 8-way passive splitter modified for DC block on 7 of the 8 channels. (the voltage feed for the antenna comes from one of the TruePosition units) 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. Thanks much and 73, ben, kd5byb

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 <kd5byb@gmail.com> 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.

Or a mfg. defect and thus why on the surplus market. -=Bryan=- ________________________________ From: time-nuts <time-nuts-bounces@lists.febo.com> on behalf of Denny Page via time-nuts <time-nuts@lists.febo.com> Sent: August 29, 2019 7:39 PM To: Discussion of precise time and frequency measurement <time-nuts@lists.febo.com> Cc: Denny Page <dennypage@me.com> 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 <kd5byb@gmail.com> 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 -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.

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 _ <bpl521@outlook.com> wrote: > > Or a mfg. defect and thus why on the surplus market. > > -=Bryan=- > > ________________________________ > From: time-nuts <time-nuts-bounces@lists.febo.com> on behalf of Denny Page via time-nuts <time-nuts@lists.febo.com> > Sent: August 29, 2019 7:39 PM > To: Discussion of precise time and frequency measurement <time-nuts@lists.febo.com> > Cc: Denny Page <dennypage@me.com> > 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 <kd5byb@gmail.com> 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.

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://www.thingiverse.com/thing:3664978 <https://www.thingiverse.com/thing:3664978>. > On Aug 30, 2019, at 11:35 AM, Denny Page via time-nuts <time-nuts@lists.febo.com> 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 _ <bpl521@outlook.com> wrote: >> >> Or a mfg. defect and thus why on the surplus market. >> >> -=Bryan=- >> >> ________________________________ >> From: time-nuts <time-nuts-bounces@lists.febo.com> on behalf of Denny Page via time-nuts <time-nuts@lists.febo.com> >> Sent: August 29, 2019 7:39 PM >> To: Discussion of precise time and frequency measurement <time-nuts@lists.febo.com> >> Cc: Denny Page <dennypage@me.com> >> 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 <kd5byb@gmail.com> 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 -- time-nuts@lists.febo.com > To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there.

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 <time-nuts@lists.febo.com> 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://www.thingiverse.com/thing:3664978 <https://www.thingiverse.com/thing:3664978>. > > > >> On Aug 30, 2019, at 11:35 AM, Denny Page via time-nuts <time-nuts@lists.febo.com> 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 _ <bpl521@outlook.com> wrote: >>> >>> Or a mfg. defect and thus why on the surplus market. >>> >>> -=Bryan=- >>> >>> ________________________________ >>> From: time-nuts <time-nuts-bounces@lists.febo.com> on behalf of Denny Page via time-nuts <time-nuts@lists.febo.com> >>> Sent: August 29, 2019 7:39 PM >>> To: Discussion of precise time and frequency measurement <time-nuts@lists.febo.com> >>> Cc: Denny Page <dennypage@me.com> >>> 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 <kd5byb@gmail.com> 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 -- time-nuts@lists.febo.com >> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there.

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 <time-nuts@lists.febo.com> 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&amp;data=02%7C01%7Cdavid.g.mcgaw%40dartmouth.edu%7Cf3faa3a2e9ed46ead3fb08d732fc9785%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C637033932771963548&amp;sdata=IHu%2Fco9fp3KRNuoi0NNUBqR8dyWAw6rKl8Bpr8m0Gl8%3D&amp;reserved=0 <https://nam05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.thingiverse.com%2Fthing%3A3664978&amp;data=02%7C01%7Cdavid.g.mcgaw%40dartmouth.edu%7Cf3faa3a2e9ed46ead3fb08d732fc9785%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C637033932771963548&amp;sdata=IHu%2Fco9fp3KRNuoi0NNUBqR8dyWAw6rKl8Bpr8m0Gl8%3D&amp;reserved=0>. >> >> >> >>> On Aug 30, 2019, at 11:35 AM, Denny Page via time-nuts <time-nuts@lists.febo.com> 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 _ <bpl521@outlook.com> wrote: >>>> >>>> Or a mfg. defect and thus why on the surplus market. >>>> >>>> -=Bryan=- >>>> >>>> ________________________________ >>>> From: time-nuts <time-nuts-bounces@lists.febo.com> on behalf of Denny Page via time-nuts <time-nuts@lists.febo.com> >>>> Sent: August 29, 2019 7:39 PM >>>> To: Discussion of precise time and frequency measurement <time-nuts@lists.febo.com> >>>> Cc: Denny Page <dennypage@me.com> >>>> 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 <kd5byb@gmail.com> 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 -- time-nuts@lists.febo.com >>> To unsubscribe, go to https://nam05.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.febo.com%2Fmailman%2Flistinfo%2Ftime-nuts_lists.febo.com&amp;data=02%7C01%7Cdavid.g.mcgaw%40dartmouth.edu%7Cf3faa3a2e9ed46ead3fb08d732fc9785%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C637033932771973545&amp;sdata=yFIp1EQIDNQfOuqkyUAIY2QjSq4yNYMmrt6wi%2Bdu21M%3D&amp;reserved=0 >>> and follow the instructions there. >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe, go to https://nam05.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.febo.com%2Fmailman%2Flistinfo%2Ftime-nuts_lists.febo.com&amp;data=02%7C01%7Cdavid.g.mcgaw%40dartmouth.edu%7Cf3faa3a2e9ed46ead3fb08d732fc9785%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C637033932771973545&amp;sdata=yFIp1EQIDNQfOuqkyUAIY2QjSq4yNYMmrt6wi%2Bdu21M%3D&amp;reserved=0 >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to https://nam05.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.febo.com%2Fmailman%2Flistinfo%2Ftime-nuts_lists.febo.com&amp;data=02%7C01%7Cdavid.g.mcgaw%40dartmouth.edu%7Cf3faa3a2e9ed46ead3fb08d732fc9785%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C637033932771973545&amp;sdata=yFIp1EQIDNQfOuqkyUAIY2QjSq4yNYMmrt6wi%2Bdu21M%3D&amp;reserved=0 > and follow the instructions there.

Run the plastic in a microwave oven, with a glass of water. Don’t use it if the plastic gets warm. /Björn Sent from my iPhone > On 6 Sep 2019, at 21:45, David G. McGaw <David.G.McGaw@dartmouth.edu> wrote: > > 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 <time-nuts@lists.febo.com> 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&amp;data=02%7C01%7Cdavid.g.mcgaw%40dartmouth.edu%7Cf3faa3a2e9ed46ead3fb08d732fc9785%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C637033932771963548&amp;sdata=IHu%2Fco9fp3KRNuoi0NNUBqR8dyWAw6rKl8Bpr8m0Gl8%3D&amp;reserved=0 <https://nam05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.thingiverse.com%2Fthing%3A3664978&amp;data=02%7C01%7Cdavid.g.mcgaw%40dartmouth.edu%7Cf3faa3a2e9ed46ead3fb08d732fc9785%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C637033932771963548&amp;sdata=IHu%2Fco9fp3KRNuoi0NNUBqR8dyWAw6rKl8Bpr8m0Gl8%3D&amp;reserved=0>. >>> >>> >>> >>>> On Aug 30, 2019, at 11:35 AM, Denny Page via time-nuts <time-nuts@lists.febo.com> 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 _ <bpl521@outlook.com> wrote: >>>>> >>>>> Or a mfg. defect and thus why on the surplus market. >>>>> >>>>> -=Bryan=- >>>>> >>>>> ________________________________ >>>>> From: time-nuts <time-nuts-bounces@lists.febo.com> on behalf of Denny Page via time-nuts <time-nuts@lists.febo.com> >>>>> Sent: August 29, 2019 7:39 PM >>>>> To: Discussion of precise time and frequency measurement <time-nuts@lists.febo.com> >>>>> Cc: Denny Page <dennypage@me.com> >>>>> 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 <kd5byb@gmail.com> 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 -- time-nuts@lists.febo.com >>>> To unsubscribe, go to https://nam05.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.febo.com%2Fmailman%2Flistinfo%2Ftime-nuts_lists.febo.com&amp;data=02%7C01%7Cdavid.g.mcgaw%40dartmouth.edu%7Cf3faa3a2e9ed46ead3fb08d732fc9785%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C637033932771973545&amp;sdata=yFIp1EQIDNQfOuqkyUAIY2QjSq4yNYMmrt6wi%2Bdu21M%3D&amp;reserved=0 >>>> and follow the instructions there. >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@lists.febo.com >>> To unsubscribe, go to https://nam05.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.febo.com%2Fmailman%2Flistinfo%2Ftime-nuts_lists.febo.com&amp;data=02%7C01%7Cdavid.g.mcgaw%40dartmouth.edu%7Cf3faa3a2e9ed46ead3fb08d732fc9785%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C637033932771973545&amp;sdata=yFIp1EQIDNQfOuqkyUAIY2QjSq4yNYMmrt6wi%2Bdu21M%3D&amp;reserved=0 >>> and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe, go to https://nam05.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.febo.com%2Fmailman%2Flistinfo%2Ftime-nuts_lists.febo.com&amp;data=02%7C01%7Cdavid.g.mcgaw%40dartmouth.edu%7Cf3faa3a2e9ed46ead3fb08d732fc9785%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C637033932771973545&amp;sdata=yFIp1EQIDNQfOuqkyUAIY2QjSq4yNYMmrt6wi%2Bdu21M%3D&amp;reserved=0 >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there.