Re: [time-nuts] Req: Decent GPS Antenna Active/PassiveRecommendation

[cfo]

On Sun, 15 Sep 2013 10:42:36 +0100, Robert Atkinson wrote:

> Hi John,
> I use one of the 26dB active timing antenna like ebay item 271266449940
> or 170889540720 but a quick look shows fluke.l is selling a 38dB one
> 300956651110 that might be good if you have a long antenna run. You
> don't say what receiver(s) you have, but the Thunderbolt needs a gain
> antenna. It's always best to put the gain at the antenna. On the subject
> of feeders, while the systems are 50R impedance, it is common to use 75R
> cable TV or satellite coax. It's cheaper and lower loss at 1.5GHz than
> common 50R cable. The loss due to mismatch is less than the reduced line
> loss. Trimble rcommend this approach.
> 
> HTH,
> Robert G8RPI.
> 
I'm also using a "MaxRad/Lucent" but got 40dB's ... 
But watch out (too much gain can also be bad) , i use it with a N-to-F 
adapter , and 30m of quad shielded 75ohm-Coax. 

I made sure i got the "Tube/pipe mount kit along" ... See 290975411221 (ok 
price) or 271265728193

CFO

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Req: Decent GPS Antenna Active/PassiveRecommendation

[J. L. Trantham]

John,

I, too, use one of those 26 dB antennas.  It's been mounted outside on the
corner of my workshop for several years with no problems.

Joe



-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Robert Atkinson
Sent: Sunday, September 15, 2013 4:43 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Req: Decent GPS Antenna
Active/PassiveRecommendation

Hi John,
I use one of the 26dB active timing antenna like ebay item 271266449940 or
170889540720 but a quick look shows fluke.l is selling a 38dB one
300956651110 that might be good if you have a long antenna run. You don't
say what receiver(s) you have, but the Thunderbolt needs a gain antenna.
It's always best to put the gain at the antenna. On the subject of feeders,
while the systems are 50R impedance, it is common to use 75R cable TV or
satellite coax. It's cheaper and lower loss at 1.5GHz than common 50R cable.
The loss due to mismatch is less than the reduced line loss. Trimble
rcommend this approach.

HTH,
Robert G8RPI.






___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Req: Decent GPS Antenna Active/PassiveRecommendation

[Bob Camp]

Hi


On Sep 15, 2013, at 9:42 AM, Jim Lux  wrote:

> On 9/15/13 2:27 AM, Anthony Stirk wrote:
>> Hi John,
>> 
>> I've found as long as the module has lock the level of timing isn't going
>> to change so you can use anything really (heck we even us ceramic chip
>> antennas on some boards). For outside use any active automotive patch
>> should be fine but keep the lead as short as possible. Again I don't
>> believe the antenna actually needs to be outside the NEO-6T modules will
>> give timing with just one satellite so as long as you can get a lock
>> indoors you should be fine.
>> 
>> I run a pair of chinese magnetic patch antennas indoors (on top my bench
>> PSU) in the window.
>> 
> 
> 
> If you're going to get obsessive about the timing signals, putting your 
> antenna outside means that you can put it up high enough to avoid multipath.  
> For ham use, for instance for time tagging, and to drive a GPS disciplined 
> oscillator for a frequency standard.. anywhere you can get a signal is 
> probably good enough. (unless you're looking for that last microhertz in the 
> ARRL frequency measurement test)

It's not all that hard to spot the GPS antenna(s) on a normal cell site. They 
typically are installed in some pretty awful locations (GPS wise). They still 
do what they need to despite that. 

GPSDO's will indeed perform measurably better if care is taken with antenna 
location. For a cell tower - not an issue. As long as better placement doesn't 
cost much - why not optimize things? Better is still better…

Bob

> 
> 
> 
> 
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Req: Decent GPS Antenna Active/PassiveRecommendation

[Jim Lux]

On 9/15/13 2:27 AM, Anthony Stirk wrote:

Hi John,

I've found as long as the module has lock the level of timing isn't going
to change so you can use anything really (heck we even us ceramic chip
antennas on some boards). For outside use any active automotive patch
should be fine but keep the lead as short as possible. Again I don't
believe the antenna actually needs to be outside the NEO-6T modules will
give timing with just one satellite so as long as you can get a lock
indoors you should be fine.

I run a pair of chinese magnetic patch antennas indoors (on top my bench
PSU) in the window.




If you're going to get obsessive about the timing signals, putting your 
antenna outside means that you can put it up high enough to avoid 
multipath.  For ham use, for instance for time tagging, and to drive a 
GPS disciplined oscillator for a frequency standard.. anywhere you can 
get a signal is probably good enough. (unless you're looking for that 
last microhertz in the ARRL frequency measurement test)





___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Req: Decent GPS Antenna Active/PassiveRecommendation

[Robert Atkinson]

Hi John,
I use one of the 26dB active timing antenna like ebay item 271266449940 or 
170889540720 but a quick look shows fluke.l is selling a 38dB one 300956651110 
that might be good if you have a long antenna run. You don't say what 
receiver(s) you have, but the Thunderbolt needs a gain antenna. It's always 
best to put the gain at the antenna. On the subject of feeders, while the 
systems are 50R impedance, it is common to use 75R cable TV or satellite coax. 
It's cheaper and lower loss at 1.5GHz than common 50R cable. The loss due to 
mismatch is less than the reduced line loss. Trimble rcommend this approach.

HTH,
Robert G8RPI.





 From: David J Taylor 
To: Discussion of precise time and frequency measurement  
Sent: Sunday, 15 September 2013, 10:14
Subject: Re: [time-nuts] Req: Decent GPS Antenna Active/PassiveRecommendation
 

Hello David,

Thanks for the pic!

Well, I need something that I can put outside, in the weather, with my
verticals, and other antennas.  I am a Ham radio enthusiast, and I want
something I can properly mount and can be an all-weather device and can
live happily 'in the farm' so to speak.

I should have been more specific.

Thanks Again,
John Westmoreland
AJ6BC - (that's my call sign)
===


Thanks for the clarification, John.  I'm sure others will answer your 
question, but here I have not found the need for an outdoors GPS antenna, 
being located on the top floor of a two-storey building, in a good VHF 
location.  This with one exception - an older Garmin GPS 18 LVC, which had 
the sensitivity of decade-old devices, not the modern chips.  That just sits 
on the sloping roof, actually on the opposite side of the roof from these 
antennas:

  http://www.satsignal.eu/wxsat/atovs/pic_old-and-new.jpg

from:
  http://www.satsignal.eu/wxsat/atovs/index.html

73,
David GM8ARV
-- 
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk 

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Req: Decent GPS Antenna Active/PassiveRecommendation

[Anthony Stirk]

Hi John,

I've found as long as the module has lock the level of timing isn't going
to change so you can use anything really (heck we even us ceramic chip
antennas on some boards). For outside use any active automotive patch
should be fine but keep the lead as short as possible. Again I don't
believe the antenna actually needs to be outside the NEO-6T modules will
give timing with just one satellite so as long as you can get a lock
indoors you should be fine.

I run a pair of chinese magnetic patch antennas indoors (on top my bench
PSU) in the window.

Cheers,

Anthony M0UPU


On Sun, Sep 15, 2013 at 10:14 AM, David J Taylor <
david-tay...@blueyonder.co.uk> wrote:

> Hello David,
>
> Thanks for the pic!
>
> Well, I need something that I can put outside, in the weather, with my
> verticals, and other antennas.  I am a Ham radio enthusiast, and I want
> something I can properly mount and can be an all-weather device and can
> live happily 'in the farm' so to speak.
>
> I should have been more specific.
>
> Thanks Again,
> John Westmoreland
> AJ6BC - (that's my call sign)
> ==**=
>
>
> Thanks for the clarification, John.  I'm sure others will answer your
> question, but here I have not found the need for an outdoors GPS antenna,
> being located on the top floor of a two-storey building, in a good VHF
> location.  This with one exception - an older Garmin GPS 18 LVC, which had
> the sensitivity of decade-old devices, not the modern chips.  That just
> sits on the sloping roof, actually on the opposite side of the roof from
> these antennas:
>
>  
> http://www.satsignal.eu/wxsat/**atovs/pic_old-and-new.jpg
>
> from:
>  
> http://www.satsignal.eu/wxsat/**atovs/index.html
>
> 73,
> David GM8ARV
>
> --
> SatSignal Software - Quality software written to your requirements
> Web: http://www.satsignal.eu
> Email: david-tay...@blueyonder.co.uk
> __**_
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/**
> mailman/listinfo/time-nuts
> and follow the instructions there.
>
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Req: Decent GPS Antenna Active/PassiveRecommendation

[John C. Westmoreland, P.E.]

Hello David,

The polar orbiting APT antenna looks interesting.

Thanks again for the pics!  And - I know your call sign now too!

73's,
John
AJ6BC


On Sun, Sep 15, 2013 at 2:14 AM, David J Taylor <
david-tay...@blueyonder.co.uk> wrote:

> Hello David,
>
> Thanks for the pic!
>
> Well, I need something that I can put outside, in the weather, with my
> verticals, and other antennas.  I am a Ham radio enthusiast, and I want
> something I can properly mount and can be an all-weather device and can
> live happily 'in the farm' so to speak.
>
> I should have been more specific.
>
> Thanks Again,
> John Westmoreland
> AJ6BC - (that's my call sign)
> ==**=
>
>
> Thanks for the clarification, John.  I'm sure others will answer your
> question, but here I have not found the need for an outdoors GPS antenna,
> being located on the top floor of a two-storey building, in a good VHF
> location.  This with one exception - an older Garmin GPS 18 LVC, which had
> the sensitivity of decade-old devices, not the modern chips.  That just
> sits on the sloping roof, actually on the opposite side of the roof from
> these antennas:
>
>  
> http://www.satsignal.eu/wxsat/**atovs/pic_old-and-new.jpg
>
> from:
>  
> http://www.satsignal.eu/wxsat/**atovs/index.html
>
> 73,
> David GM8ARV
>
> --
> SatSignal Software - Quality software written to your requirements
> Web: http://www.satsignal.eu
> Email: david-tay...@blueyonder.co.uk
> __**_
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/**
> mailman/listinfo/time-nuts
> and follow the instructions there.
>
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] Req: Decent GPS Antenna Active/PassiveRecommendation

[David J Taylor]

Hello David,

Thanks for the pic!

Well, I need something that I can put outside, in the weather, with my
verticals, and other antennas.  I am a Ham radio enthusiast, and I want
something I can properly mount and can be an all-weather device and can
live happily 'in the farm' so to speak.

I should have been more specific.

Thanks Again,
John Westmoreland
AJ6BC - (that's my call sign)
===


Thanks for the clarification, John.  I'm sure others will answer your 
question, but here I have not found the need for an outdoors GPS antenna, 
being located on the top floor of a two-storey building, in a good VHF 
location.  This with one exception - an older Garmin GPS 18 LVC, which had 
the sensitivity of decade-old devices, not the modern chips.  That just sits 
on the sloping roof, actually on the opposite side of the roof from these 
antennas:


 http://www.satsignal.eu/wxsat/atovs/pic_old-and-new.jpg

from:
 http://www.satsignal.eu/wxsat/atovs/index.html

73,
David GM8ARV
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk 


___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.