Re: [time-nuts] Antenna for T-bolt
Bill--
The Thunderbolt wants a higher gain antenna than most standard GPS receivers. I tried standard Garmin active antennas, and while they worked (I have a good view of the sky), signal levels could be better.
Best match probably is something like the HP/Symmetricom 58532A antenna, which has gain > 30dB -- most "active" GPS antennas are in the 24 - 26 dB range.
They're not cheap, but they'll do the job.
If you have much distance to cover, feed line is of course important as well -- 9913, LMR 400, good quality RG6, something with low loss at 1.5 GHz.
I'm using a 58532A feeding a Symmetricom 58535A active GPS splitter to run a Thunderbolt and a Datum Tymserve 2100. Feedline is 9913 to the splitter, and short LMR 195 SMA cables from there. (Yes you can find F to SMA adapters, on eBay, even though many will shudder at the concept...)
73 Bob K6RTM
On Apr 2, 2012, at 15:01, time-nuts-request@febo.com wrote:
Message: 4
Date: Mon, 2 Apr 2012 17:39:40 -0400
From: "Bill Riches" bill.riches@verizon.net
To: "'Discussion of precise time and frequency measurement'"
time-nuts@febo.com
Subject: [time-nuts] Antenna for t-bolt
Message-ID: <01ac01cd1119$1c699af0$553cd0d0$@riches@verizon.net>
Content-Type: text/plain; charset="US-ASCII"
Hi guys,
I have asked this question several times over the past few weeks and get no
answer. Have I been ostracized??!!
Question is that I am looking for suggestions for GPS antenna for t-bolt.
The antenna that I am using now is a no name and I not know where it came
from! Wonder if a Garman GA-30 will work?
73,
Bill, WA2DVU
Cape May, NJ
The booster amps used for satellite dishes work on GPS as well.
I used one when I was feeding two Thunderbolts thru a splitter.
On 04/02/2012 03:28 PM, Bob Martin wrote:
Bill--
The Thunderbolt wants a higher gain antenna than most standard GPS receivers. I tried standard Garmin active antennas, and while they worked (I have a good view of the sky), signal levels could be better.
Best match probably is something like the HP/Symmetricom 58532A antenna, which has gain> 30dB -- most "active" GPS antennas are in the 24 - 26 dB range.
They're not cheap, but they'll do the job.
If you have much distance to cover, feed line is of course important as well -- 9913, LMR 400, good quality RG6, something with low loss at 1.5 GHz.
I'm using a 58532A feeding a Symmetricom 58535A active GPS splitter to run a Thunderbolt and a Datum Tymserve 2100. Feedline is 9913 to the splitter, and short LMR 195 SMA cables from there. (Yes you can find F to SMA adapters, on eBay, even though many will shudder at the concept...)
73 Bob K6RTM
On Apr 2, 2012, at 15:01, time-nuts-request@febo.com wrote:
Message: 4
Date: Mon, 2 Apr 2012 17:39:40 -0400
From: "Bill Riches"bill.riches@verizon.net
To: "'Discussion of precise time and frequency measurement'"
time-nuts@febo.com
Subject: [time-nuts] Antenna for t-bolt
Message-ID:<01ac01cd1119$1c699af0$553cd0d0$@riches@verizon.net>
Content-Type: text/plain; charset="US-ASCII"
Hi guys,
I have asked this question several times over the past few weeks and get no
answer. Have I been ostracized??!!
Question is that I am looking for suggestions for GPS antenna for t-bolt.
The antenna that I am using now is a no name and I not know where it came
from! Wonder if a Garman GA-30 will work?
73,
Bill, WA2DVU
Cape May, NJ
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.
--
Chuck Forsberg WA7KGX N2469R caf@omen.com www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
Omen Technology Inc "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430
Here is the antenna I purchased from Ebay (China). This is a Lucent 40dB timing antenna that should work
for any GPS receiver. Mine took about 2 weeks to get here and there were no problems getting it. This unit
is currently available for 'buy it now" at $28 dollars.
Jerry Mulchin
At 03:28 PM 4/2/2012, you wrote:
Bill--
The Thunderbolt wants a higher gain antenna than most standard GPS receivers. I tried standard Garmin active antennas, and while they worked (I have a good view of the sky), signal levels could be better.
Best match probably is something like the HP/Symmetricom 58532A antenna, which has gain > 30dB -- most "active" GPS antennas are in the 24 - 26 dB range.
They're not cheap, but they'll do the job.
If you have much distance to cover, feed line is of course important as well -- 9913, LMR 400, good quality RG6, something with low loss at 1.5 GHz.
I'm using a 58532A feeding a Symmetricom 58535A active GPS splitter to run a Thunderbolt and a Datum Tymserve 2100. Feedline is 9913 to the splitter, and short LMR 195 SMA cables from there. (Yes you can find F to SMA adapters, on eBay, even though many will shudder at the concept...)
73 Bob K6RTM
On Apr 2, 2012, at 15:01, time-nuts-request@febo.com wrote:
Message: 4
Date: Mon, 2 Apr 2012 17:39:40 -0400
From: "Bill Riches" bill.riches@verizon.net
To: "'Discussion of precise time and frequency measurement'"
time-nuts@febo.com
Subject: [time-nuts] Antenna for t-bolt
Message-ID: <01ac01cd1119$1c699af0$553cd0d0$@riches@verizon.net>
Content-Type: text/plain; charset="US-ASCII"
Hi guys,
I have asked this question several times over the past few weeks and get no
answer. Have I been ostracized??!!
Question is that I am looking for suggestions for GPS antenna for t-bolt.
The antenna that I am using now is a no name and I not know where it came
from! Wonder if a Garman GA-30 will work?
73,
Bill, WA2DVU
Cape May, NJ
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.
Jerry Mulchin
On Mon, Apr 2, 2012 at 3:28 PM, Bob Martin k6rtm@comcast.net wrote:
Bill--
The Thunderbolt wants a higher gain antenna than most standard GPS receivers. I tried standard Garmin active antennas, and while they worked (I have a good view of the sky), signal levels could be better.
Best match probably is something like the HP/Symmetricom 58532A antenna, which has gain > 30dB -- most "active" GPS antennas are in the 24 - 26 dB range.
I have a 26dB timing antenna the kind that is easy to find on eBay.
It works well with my T-bolt. I have the antenna on a short mast
made of galvanized iron plumbing pipe with the feed line coming down
the center of the iron pipe.
Yes it is true the t-bolt can use more gain but it is not so clear I'd
get better timing. I can lock satellites from horizon to horizon. I
think what IS clear is that location maters MUCH more than any other
factor. First you need to find a way for the antenna to get a full
360 degree view of the sky down to the horizon, all the way around.
This may mean you have to move the t-bolt too. By that I mean,
rather then saying you can't run antenna feed down from the roof,
place the t-bolt new the roof then use cat-5 wire ro whatever to bring
the 10MHZ and PPS and Serial data down. Details are site dependent
but getting the antenna to a good location should drive all yu other
trade offs.
Lastly you can replace the antenna with a "real" timing antenna. I
had a patch type mag mount on the roof, it worked but the pointed
radome but keeps birds off and if it snowed here would keep that off
too.
Chris Albertson
Redondo Beach, California
All gone .. I got one. I'm happy for $26 but the thing was pretty
badly treated in its life and the seal did not
look well. If yours is as knocked around I'd suggest pulling it apart
and use a bit of sealer (RTV etc)
Now to come up with a mount, they are more rare and usually go for
more then the antennas
-pete
On Mon, Apr 2, 2012 at 4:00 PM, Jerry Mulchin jmulchin@cox.net wrote:
Here is the antenna I purchased from Ebay (China). This is a Lucent 40dB timing antenna that should work
for any GPS receiver. Mine took about 2 weeks to get here and there were no problems getting it. This unit
is currently available for 'buy it now" at $28 dollars.
Jerry Mulchin
At 03:28 PM 4/2/2012, you wrote:
Bill--
The Thunderbolt wants a higher gain antenna than most standard GPS receivers. I tried standard Garmin active antennas, and while they worked (I have a good view of the sky), signal levels could be better.
Best match probably is something like the HP/Symmetricom 58532A antenna, which has gain > 30dB -- most "active" GPS antennas are in the 24 - 26 dB range.
They're not cheap, but they'll do the job.
If you have much distance to cover, feed line is of course important as well -- 9913, LMR 400, good quality RG6, something with low loss at 1.5 GHz.
I'm using a 58532A feeding a Symmetricom 58535A active GPS splitter to run a Thunderbolt and a Datum Tymserve 2100. Feedline is 9913 to the splitter, and short LMR 195 SMA cables from there. (Yes you can find F to SMA adapters, on eBay, even though many will shudder at the concept...)
73 Bob K6RTM
On Apr 2, 2012, at 15:01, time-nuts-request@febo.com wrote:
Message: 4
Date: Mon, 2 Apr 2012 17:39:40 -0400
From: "Bill Riches" bill.riches@verizon.net
To: "'Discussion of precise time and frequency measurement'"
time-nuts@febo.com
Subject: [time-nuts] Antenna for t-bolt
Message-ID: <01ac01cd1119$1c699af0$553cd0d0$@riches@verizon.net>
Content-Type: text/plain; charset="US-ASCII"
Hi guys,
I have asked this question several times over the past few weeks and get no
answer. Have I been ostracized??!!
Question is that I am looking for suggestions for GPS antenna for t-bolt.
The antenna that I am using now is a no name and I not know where it came
from! Wonder if a Garman GA-30 will work?
73,
Bill, WA2DVU
Cape May, NJ
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.
Jerry Mulchin
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.
On Mon, Apr 2, 2012 at 4:00 PM, Jerry Mulchin jmulchin@cox.net wrote:
Here is the antenna I purchased from Ebay (China). This is a Lucent 40dB timing antenna that should work
for any GPS receiver. Mine took about 2 weeks to get here and there were no problems getting it. This unit
is currently available for 'buy it now" at $28 dollars.
Yours is technically better. But mine is eBay #270881742870 and works
perfectly. I'm using about 25 feet of rg58 cable and might swap it
out for rg8 just because I have a bunch of it.
I keep the t-bolt on a shelf in a second floor walk-in closet that has
no exterior walls and no forced air heater vent so it stays very
stabile temperature. The attic got to hot and to cold, other places
had heating vents and would cycle.
Chris Albertson
Redondo Beach, California
There are still some listed at GBP 19.00. Search for "lucent 40db".
Orin.
On Mon, Apr 2, 2012 at 4:14 PM, Pete Lancashire pete@petelancashire.comwrote:
All gone .. I got one. I'm happy for $26 but the thing was pretty
badly treated in its life and the seal did not
look well. If yours is as knocked around I'd suggest pulling it apart
and use a bit of sealer (RTV etc)
There's a lot of five Racal survey antennae on eBay, lot 370600485855
which have been round at least once before. I use one of these with a
T'bolt and it performs extremely well; I'm not sure what one would do
with the other four however...
5 Volt operation, TNC connector, c. 30 dB gain.
Dan
On Mon, 02 Apr 2012 15:28:40 -0700, Bob Martin wrote:
Bill--
The Thunderbolt wants a higher gain antenna than most standard GPS
receivers. I tried standard Garmin active antennas, and while they
worked (I have a good view of the sky), signal levels could be better.
Best match probably is something like the HP/Symmetricom 58532A antenna,
which has gain > 30dB -- most "active" GPS antennas are in the 24 - 26
dB range.
They're not cheap, but they'll do the job.
If you have much distance to cover, feed line is of course important as
well -- 9913, LMR 400, good quality RG6, something with low loss at 1.5
GHz.
I'm using a 58532A feeding a Symmetricom 58535A active GPS splitter to
run a Thunderbolt and a Datum Tymserve 2100. Feedline is 9913 to the
splitter, and short LMR 195 SMA cables from there. (Yes you can find F
to SMA adapters, on eBay, even though many will shudder at the
concept...)
73 Bob K6RTM
On Apr 2, 2012, at 15:01, time-nuts-request@febo.com
wrote:
Message: 4
Date: Mon, 2 Apr 2012 17:39:40 -0400
From: "Bill Riches"
bill.riches@verizon.net To: "'Discussion
of precise time and frequency measurement'"
time-nuts@febo.com
Subject: [time-nuts] Antenna for t-bolt Message-ID:
<01ac01cd1119$1c699af0$553cd0d0$@riches-H
Content-Type: text/plain; charset="US-ASCII"
Hi guys,
I have asked this question several times over the past few weeks and
get no answer. Have I been ostracized??!!
Question is that I am looking for suggestions for GPS antenna for
t-bolt. The antenna that I am using now is a no name and I not know
where it came from! Wonder if a Garman GA-30 will work?
I think "any" 5v antenna with a 25+ dB gain would work.
But the Tbolt likes a high gain antenna.
I'm using Maxrad GPS-TMG-40 (40dB) with N-Conn , in Copenhagen.
It works reasonably fine with 25m quality 75ohm cable.
It's on the balcony , with an ok view to the south.
But absolutely no view north , so a bit of the time only 2 sats active.
LH says
adev 1.2x e-12 on PPS
adev 5.3x e-13 on OSC
In my summerhouse i use the "mushroom like" antenna that came with the
kit from fluke.l , but i have an extra Maxrad waiting to be mounted.
This might be a good choice "eby item : 320881667391".
Just key in the # in search
This is the symetricom as item : 300571554900
cfo
The Symmetricom item 300571554900 you listed below includes a GPS.
It is not just an antenna.
Rob Kimberley
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of cfo
Sent: 03 April 2012 15:31
To: time-nuts@febo.com
Subject: Re: [time-nuts] Antenna for T-bolt
On Mon, 02 Apr 2012 15:28:40 -0700, Bob Martin wrote:
Bill--
The Thunderbolt wants a higher gain antenna than most standard GPS
receivers. I tried standard Garmin active antennas, and while they
worked (I have a good view of the sky), signal levels could be better.
Best match probably is something like the HP/Symmetricom 58532A
antenna, which has gain > 30dB -- most "active" GPS antennas are in
the 24 - 26 dB range.
They're not cheap, but they'll do the job.
If you have much distance to cover, feed line is of course important
as well -- 9913, LMR 400, good quality RG6, something with low loss at
1.5 GHz.
I'm using a 58532A feeding a Symmetricom 58535A active GPS splitter to
run a Thunderbolt and a Datum Tymserve 2100. Feedline is 9913 to the
splitter, and short LMR 195 SMA cables from there. (Yes you can find
F to SMA adapters, on eBay, even though many will shudder at the
concept...)
73 Bob K6RTM
On Apr 2, 2012, at 15:01, time-nuts-request@febo.com
wrote:
Message: 4
Date: Mon, 2 Apr 2012 17:39:40 -0400
From: "Bill Riches"
bill.riches@verizon.net To: "'Discussion of precise time and
frequency measurement'"
time-nuts@febo.com
Subject: [time-nuts] Antenna for t-bolt Message-ID:
<01ac01cd1119$1c699af0$553cd0d0$@riches-H
Content-Type: text/plain; charset="US-ASCII"
Hi guys,
I have asked this question several times over the past few weeks and
get no answer. Have I been ostracized??!!
Question is that I am looking for suggestions for GPS antenna for
t-bolt. The antenna that I am using now is a no name and I not know
where it came from! Wonder if a Garman GA-30 will work?
I think "any" 5v antenna with a 25+ dB gain would work.
But the Tbolt likes a high gain antenna.
I'm using Maxrad GPS-TMG-40 (40dB) with N-Conn , in Copenhagen.
It works reasonably fine with 25m quality 75ohm cable.
It's on the balcony , with an ok view to the south.
But absolutely no view north , so a bit of the time only 2 sats active.
LH says
adev 1.2x e-12 on PPS
adev 5.3x e-13 on OSC
In my summerhouse i use the "mushroom like" antenna that came with the kit
from fluke.l , but i have an extra Maxrad waiting to be mounted.
This might be a good choice "eby item : 320881667391".
Just key in the # in search
This is the symetricom as item : 300571554900
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.