On 04/07/2012 01:30 PM, Tom Van Baak wrote:
It might be a stupid question, but what is the spike at the top for?
It's just plastic; not for lightning. For me it keeps birds from sitting
on the top of the radome and dropping liquid gps signal attenuators.
This is actually an improvement over r
> On Tue, 3 Apr 2012 22:05:22 +0200
> b...@lysator.liu.se wrote:
>
>> http://www.aeroantenna.com/PDF/AT575-90_G.pdf
>
> It might be a stupid question, but what is the spike at the top for?
>
> Attila Kinali
It is there to make birds feel unconfortable.
--
Björn
It might be a stupid question, but what is the spike at the top for?
It's just plastic; not for lightning. For me it keeps birds from sitting
on the top of the radome and dropping liquid gps signal attenuators.
/tvb
___
time-nuts mailing list -- tim
On Tue, 3 Apr 2012 22:05:22 +0200
b...@lysator.liu.se wrote:
> http://www.aeroantenna.com/PDF/AT575-90_G.pdf
It might be a stupid question, but what is the spike at the top for?
Attila Kinali
--
Why does it take years to find the answers to
the questions one should ha
The great thing about this antenna is that even if doesn't work you can always
throw it in the air and get some great UFO photos.
Thomas Knox
> Date: Tue, 3 Apr 2012 22:21:18 +0200
> From: azelio.bori...@screen.it
> To: time-nuts@febo.com
> Subject: Re: [time-nuts] A
shali...@gmail.com said:
> I got it with a red box Thunderbolt I bought from a lit member a long time
> ago. It has some obvious signs of experience being outside. It is possible
> that moisture got inside. Maybe I should try to take it apart? Not sure how
> to open it without breaking the radome.
Yes, there was an antenna with the "sting" months ago, now that I see your
PDF I remember but can't remember the price and the brand.
On Tue, Apr 3, 2012 at 10:05 PM, wrote:
> Typical chokerings are L1/L2 geodetic antennas. There is however "simple"
> L1-only chokerings available from time to ti
Typical chokerings are L1/L2 geodetic antennas. There is however "simple"
L1-only chokerings available from time to time on *bay. I have often seen
them as low as in the $50 range. Orginal use I think was for DGPS
reference stations. Most seem to be the Aeroantenna model in the url
below.
http
-To: Discussion of precise time and frequency measurement
>
> Subject: Re: [time-nuts] Antenna for t-bolt
>
> Of course the elevation mask is only software and doesn't prevent the bad
> signal from entering the antenna but then the signal will not despread and
> shoul
ginal Message-
From: Azelio Boriani
Sender: time-nuts-boun...@febo.com
Date: Tue, 3 Apr 2012 21:27:26
To: Discussion of precise time and frequency measurement
Reply-To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Antenna for t-bolt
Of course the elevation
ions
> from roofs and such, so it is definitely not useless, but it is not the
> same as having a good antenna in the first place.
>
> Didier KO4BB
>
> --Original Message--
> From: Hal Murray
> Sender: time-nuts-boun...@febo.com
> To: Time-Nuts
> ReplyTo: Time-N
: [time-nuts] Antenna for t-bolt
Sent: Apr 3, 2012 12:15 AM
c...@omen.com said:
> Presumably a timing antenna would block low elevation signals to reduce
> multipath.
Maybe, but there is a software aspect to the filter. You get to select the
elevation angle.
I don't remember seein
time and frequency measurement
Subject: Re: [time-nuts] Antenna for t-bolt
Hi Didier,
I have one of the Trimble Bullet antennas, that was supposed to be from
a working system, but it is deaf as a post... really dead. Given that
it is supposed to be more than 30db gain, it should do better
They look OK.
:-)
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of cfo
Sent: 03 April 2012 15:51
To: time-nuts@febo.com
Subject: Re: [time-nuts] Antenna for T-bolt
On Tue, 03 Apr 2012 15:40:05 +0100, Rob Kimberley wrote:
>
On Tue, 03 Apr 2012 15:40:05 +0100, Rob Kimberley wrote:
> The Symmetricom item 300571554900 you listed below includes a GPS.
>
> It is not just an antenna.
>
> Rob Kimberley
Oopzz , good catch (sorry)
280847506469 (us)
320878139168 (cn)
Might be better
cfo
_
] 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
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 prob
Chuck,
> I got a mushroom shaped antenna along with my Thunderbolt.
> It came with some rg58 terminated in an F connector.
> I don't know if it is a timing reference antenna or just a plain
> GPS antenna.
>
> Presumably a timing antenna would block low elevation signals
> to reduce multipath.
One
Chuck,
I usually see GPS antennae flashed by lightning: have succedeed opening and
repairing a couple of them but at times they are too bad to do anything. I
use a network analyzer to test them after repairing here at work.
On Tue, Apr 3, 2012 at 8:24 AM, gary wrote:
> Going back to software fil
Going back to software filtering brings us full circle. ;-)
Searching the interwebs, I found this:
http://www.ll.mit.edu/mission/aviation/publications/publication-files/atc-reports/Dinius_1995_ATC-238_WW-15318.pdf
They more or less state the obvious, but do provide some test results.
Now the
c...@omen.com said:
> Presumably a timing antenna would block low elevation signals to reduce
> multipath.
Maybe, but there is a software aspect to the filter. You get to select the
elevation angle.
I don't remember seeing any specs about the filtering angles of various
antennas. Has anybod
Here is a picture of the guts of the antenna that was made for
the Thunderbolt. They don't appear to have gone to much effort
to have a high horizon.
-Chuck Harris
Chuck Forsberg WA7KGX N2469R wrote:
I got a mushroom shaped antenna along with my Thunderbolt.
It came with some rg58 terminated i
I got a mushroom shaped antenna along with my Thunderbolt.
It came with some rg58 terminated in an F connector.
I don't know if it is a timing reference antenna or just a plain
GPS antenna.
Presumably a timing antenna would block low elevation signals
to reduce multipath.
On 04/02/2012 09:11 PM,
Hi Didier,
I have one of the Trimble Bullet antennas, that was supposed to be from
a working system, but it is deaf as a post... really dead. Given that
it is supposed to be more than 30db gain, it should do better than any
of the hockey puck antennas.
I wonder if there is a common failure mode
On 4/2/2012 5:39 PM, Bill Riches wrote:
Question is that I am looking for suggestions for GPS antenna for t-bolt.
I use an Andrew GPS-QBW-26N (quadrifilar). 26 db amp + 4 db antenna
gain, through an HP 58516 distribution amp. Works well for me.
___
I have a Symetricom 58532A which I bought on eBay for $50 with shipping.
That is probably the best antenna you can get, and it won't break the bank.
I also have a Trimble Bullet, the antenna that was designed to go with the
Tunderbolt. It is a very good antenna also, but harder to find, and it has
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.
D
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 wrote:
> 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 su
On Mon, Apr 2, 2012 at 4:00 PM, Jerry Mulchin 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 availabl
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
On Mon, Apr 2, 2012 at 3:28 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
The firmware filters out the low angle birds. [And it is a variable in
Lady Heather.] However, it is quite possible the antennas specifically
designed for timing have better immunity to low angle QRM. If I were to
mount the GPS antenna on a cell phone tower, I'd certainly want it to be
dead on
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.
http://www.ebay.com/itm/luce
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 antenna
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
Yes, every antenna will do but the best is a dedicated timing antenna such
as the Motorola Timing2000 and others. The low angle satellites can be
masked out with the appropriate parameter. For the ultimate precision a
geodetic/surveillance antenna (i.e. the Trimble Zephyr) is... well...
really too
I found these at a local surplus shop. $15 each. It worked on the
Starloc. I got the 240 version which has high gain. The Starloc is a bit
deaf. So to pick an antenna for the Tbolt, it should meet gain
requirements and voltage. Marine grade is kind of overkill. Potentially
the marine grade gear
First time I have seen this request ...
But, TAPR has Motorola ANT1A antennas for $9 each.
73, Dick, W1KSZ
-Original Message-
>From: Bill Riches
>Sent: Apr 2, 2012 2:39 PM
>To: 'Discussion of precise time and frequency measurement'
>Subject: [time-nuts] Antenna for t-bolt
>
>Hi guys,
My symetricom 58532A works well.
Sent from my iPod
On 2012-04-02, at 2:39 PM, "Bill Riches" wrote:
> 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
Every antenna will work with the TBolt. It is of greater importance the
positioning: must clearly see the sky all around, unless you are at a high
latitude (>50 degrees) so that the north is less important as the latitude
increases. I (but it is only my opinion) recommend the quadrifilar helix
type
On Mon, Apr 2, 2012 at 2:39 PM, Bill Riches wrote:
> 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
TAPR is selling a nice antenna for $10.
73, Dick, W1KSZ
-Original Message-
>From: Mark Amos <[EMAIL PROTECTED]>
>Sent: May 20, 2008 3:12 PM
>To: time-nuts@febo.com
>Subject: [time-nuts] antenna for t-bolt
>
>tvb or others on the list,
>
>Any recommendations on an inexpensive antenna to us
I have a Trimble Bullet, a Symmetricom HP 58532 and an inexpensive mag-mount
patch antenna. All are amplified. As far as how many sats they see, they are
roughly equivalent. Of course, the Bullet and HP units have narrow filters
and better defined capture range (to reject reflections from the sides
These antennas work very well with the Thunderbolt:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=280228924879
Pyrojoseph is a great seller. I've bought a lot of stuff from him over the
years.
This antenna will need a BNC-male/SMA-female adapter for use with the BNC-F
adapter packaged with
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