m] On Behalf Of Magnus
Danielson
Sent: 17 June 2017 15:12
To: time-nuts@febo.com
Cc: mag...@rubidium.se
Subject: Re: [time-nuts] GPS splitter
Hi,
At one time I had to design a DC-load since the GPSDO did not experience enough antenna
current due to a different antenna being used. So, a BNC-
Hi:
I just use a resistor.
http://www.prc68.com/I/DAGR.shtml#PS
and here is the Cable TV power divider were Type-F DC blocks are added to all
but one of the output ports.
http://www.prc68.com/I/4GPS.shtml
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012I
Hi
Hitting the inductance required is relatively easy. Doing so and not hitting
self resonance is a bit more tricky.
Even a zero ohm reactance likely will work ok (in series with a 150 ohm
resistor). It’s tough to know
what you have done without a network analyzer. It is even possible that yo
On Wed, 21 Jun 2017 15:03:54 -0400
Bob kb8tq wrote:
> The typical answer is: The largest one I could that 1) Would handle the short
> circuit current expected and
> 2) was self resonant at or above 1.6 GHz.
I found out, by experiment, that any "large enough" inductance is ok.
A simple "a few do
68nH or so?
>
> Dave
>
> -Original Message-
> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Magnus
> Danielson
> Sent: 17 June 2017 15:12
> To: time-nuts@febo.com
> Cc: mag...@rubidium.se
> Subject: Re: [time-nuts] GPS splitter
>
> Hi,
Hi Magnus - what sort of inductor value did you use? 68nH or so?
Dave
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Magnus
Danielson
Sent: 17 June 2017 15:12
To: time-nuts@febo.com
Cc: mag...@rubidium.se
Subject: Re: [time-nuts] GPS splitter
Hi
: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of
ziggy9+time-n...@pumpkinbrook.com
Sent: 18 June 2017 21:07
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] GPS splitter
+1 for satellite splitters as a low cost option. But as others have mentioned,
you d
Hi
One subtle advantage of the simple satellite splitters - F connector based DC
blocks are dirt cheap ….
Bob
> On Jun 18, 2017, at 4:06 PM, ziggy9+time-n...@pumpkinbrook.com wrote:
>
> +1 for satellite splitters as a low cost option. But as others have
> mentioned, you do need to use a littl
+1 for satellite splitters as a low cost option. But as others have mentioned,
you do need to use a little care. Some are 'DC isolated', but that can mean
diode OR’ing for each port (all ports DC pass) and not a DC block. And they
often don’t have the frequency response (many satellite splitters
Hi
It also depends a bit on weather the original designer anticipated odd things
happening on
the antenna circuit. The answer to that one is …. errr …. not always. Some
designs have the
antenna supply tacked straight into a bulk regulator that feeds a bunch of
stuff. Other designs
have an indé
Hi,
On 06/18/2017 05:37 PM, Bob kb8tq wrote:
Hi
On Jun 18, 2017, at 11:17 AM, David J Taylor
wrote:
"David J Taylor" wrote:
.. or a ready-made, and smaller item:
http://www.ebay.co.uk/itm/1GHz-3GHz-2-4GHz-Power-Splitter-Combiner-2-Way-SMA-/141740586696
I use this successfully for 1.09
Hi
> On Jun 18, 2017, at 11:17 AM, David J Taylor
> wrote:
>
> "David J Taylor" wrote:
>
>> .. or a ready-made, and smaller item:
>>
>> http://www.ebay.co.uk/itm/1GHz-3GHz-2-4GHz-Power-Splitter-Combiner-2-Way-SMA-/141740586696
>>
>> I use this successfully for 1.09 GHz ADS-B splitting.
>
>
"David J Taylor" wrote:
.. or a ready-made, and smaller item:
http://www.ebay.co.uk/itm/1GHz-3GHz-2-4GHz-Power-Splitter-Combiner-2-Way-SMA-/141740586696
I use this successfully for 1.09 GHz ADS-B splitting.
Please be aware that this is a Wilkinson splitter and thus has a DC
path connecting
On Sun, 18 Jun 2017 07:50:17 +0100
"David J Taylor" wrote:
> .. or a ready-made, and smaller item:
>
>
> http://www.ebay.co.uk/itm/1GHz-3GHz-2-4GHz-Power-Splitter-Combiner-2-Way-SMA-/141740586696
>
> I use this successfully for 1.09 GHz ADS-B splitting.
Please be aware that this is a Wilkin
Hi
If you don’t mind shopping a bit, the Minicircuits two way GPS splitters
shipped out with every
TBolt and a variety of other Lucent gear. They show up at very cheap prices
sometimes …
My suggestion is to spend the $20 and just get one of the eight way
Minicircuits L band units.
That way y
Hi
There is a poorman's way of making a -3dB splitter using lengths of cable of
characteristic impedance equal to the system impedance.
[]
John Ponsonby
.. or a ready-made, and smaller item:
http://www.ebay.co.uk/itm/1GHz-3GHz-2-4GHz-Power-Splitter-Combin
GPS receiver antenna alarms tend to be "informational" only. They monitor
the current that the antenna is drawing. Better ones report open, short, or
OK. Others provide just an OK / fault. A few have no antenna monitoring at
all. The RFTG-m reports the voltages at each end of a 100 ohm
Hi
There is a poorman's way of making a -3dB splitter using lengths of cable of
characteristic impedance equal to the system impedance. That is to say using
only 50Ω cable in a 50Ω system. It is a variant on the well known square
four-port quadrature hybrid. In the standard hybrid with ports A,B
Hi,
Yes, I knew that, but wanted to play safe.
Funny how a quick hobbyist quick-and-dirty build was needed to get an
operator running. Ah well.
Cheers,
Magnus
On 06/17/2017 05:46 PM, Bob kb8tq wrote:
Hi
In some cases, you can get away with a 470 ohm resistor on the Tee and leave
out the i
On Fri, Jun 16, 2017 at 8:54 PM, Clay Autery wrote:
> This brings up some interesting questions:
>
>
> I am assuming since this is a receive only situation, it will follow
> approximately the same rules of physics that dealing with satellite
> antenna installations.
>
And guess what? Satellite
Hi
In some cases, you can get away with a 470 ohm resistor on the Tee and leave
out the inductor. A lot depends on
the threshold of the detect circuit in the GPSDO. Since the signal is normally
well amplified before it ever gets to the
splitter, adding a small amount of loss generally is not a
On 6/17/2017 7:40 AM, Bob kb8tq wrote:
will do a pretty good job of “antenna detect” signaling. In the more general
case
of “I didn’t design this beast” dc blocks and dc shunts to ground is the best
approach.
This fairly quickly gets you headed in the direction of the HP / Symmetricom
splitters
Hi,
At one time I had to design a DC-load since the GPSDO did not experience
enough antenna current due to a different antenna being used. So, a
BNC-T was quickly converted with a SMD inductor and resistor to add 150
Ohm of more load, and that helped the telecom operator to get their GPS
out
Hi
The DC block requirement depends a lot on the design of the GPSDO’s you
are using. With some GPSDO’s a 50 ohm load on the eighth port of a splitter
will do a pretty good job of “antenna detect” signaling. In the more general
case
of “I didn’t design this beast” dc blocks and dc shunts to gro
I use an HP / Symmetricom 58517A 8 port splitter (the 58536A splitter is a 4
port version and the 58535A is a two port version). They have an amplifier
built in. It is powered by any/all of the the connected GPS devices and feeds
power to the antenna. It work very well... I have it driving 7
> Le 17 juin 2017 à 02:26, Tim Lister a écrit :
>
> On Fri, Jun 16, 2017 at 4:40 PM, Gregory Beat wrote:
>> I have reached the point that I need a 4-port splitter for my GPS antenna
>> (outdoor 5 volt). Any recommendations of models (HP/Symmertricom/Microsemi)
>> to acquire OR to avoid??
>
Clay wrote:
If sharing an active GPS antenna, do you have to DC block all but one
receiver port to prevent multiple receivers trying to supply current to
the antenna?
Yes. Note that you may need to put DC loads on the other receivers to
fool them into thinking they have an antenna attached (
This brings up some interesting questions:
If sharing an active GPS antenna, do you have to DC block all but one
receiver port to prevent multiple receivers trying to supply current to
the antenna?
On say a 26dB antenna (ignoring line loss, power divider insertion loss,
et al), what is the effect
On Fri, Jun 16, 2017 at 4:40 PM, Gregory Beat wrote:
> I have reached the point that I need a 4-port splitter for my GPS antenna
> (outdoor 5 volt). Any recommendations of models (HP/Symmertricom/Microsemi)
> to acquire OR to avoid??
As we recommended to me when I asked a similar question, the
I have reached the point that I need a 4-port splitter for my GPS antenna
(outdoor 5 volt). Any recommendations of models (HP/Symmertricom/Microsemi) to
acquire OR to avoid??
greg
---
> I've decided I need more clocks :)
>
> Dave
___
time-nuts mailin
Anyone in UK have a spare GPS splitter?
I've decided I need more clocks :)
Dave
___
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.
The 58535A splitter has been spoken for.
___
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.
I have a 58535A splitter that was purchased on ebay in 2013 that was
working fine when I stopped using in 2014.
I'd like to "give" it to someone who has need of a reasonable two-way
splitter. I.e. not simply for resale if you don't mind.
It goes to the first requester -- off-list ONLY.
You have
I test GPS antennae for warranty purposes: customers want to know if really
defective or not.
On Fri, Oct 12, 2012 at 7:45 AM, wrote:
> Paul,
>
> > Azelio,
> > Not at all the satellite splitters can be smart or passive. I use a
> > passive
> > so it has 1 dc path. But all of the other ports have
Paul,
> Azelio,
> Not at all the satellite splitters can be smart or passive. I use a
> passive
> so it has 1 dc path. But all of the other ports have dc blocks built in.
> The smarter units will direct the highest DC to the antenna. Its really
> diodes and I stay clear of those. To smart for ther
On 10/12/2012 02:25 AM, Ed Palmer wrote:
The HP / Symmetricom 58536A has a gain spec of 0 +-3 db so something is
clearly wrong.
Agreed. I didn't have the spare energy to follow up on that.
Did you power it through a spare port?
Yes. Port 4. Will look at that again.
Also, the isolation spe
Dear Peter,
If your budget is $10 for an R.F. Project, spend $1 on the radio and $9 on the
antenna.
At least me, if I troubleshoot by replacing parts, I would be missing the fun,
experience and learning out of it.
Just my 0.02 cents
Regards,
Edgardo Molina
Direccción
IPTEL
www.iptel.net.mx
5
A stupid question, but why would you bother testing an antenna? I would think
with antennas so cheap and labor expensive it would be far more efficient to
make a single site visit and simply replace the suspect antennas with new ones.
Peter
On 10/11/2012 7:15 PM, Azelio Boriani wrote:
To te
The HP / Symmetricom 58536A has a gain spec of 0 +-3 db so something is
clearly wrong. Did you power it through a spare port? Also, the
isolation spec is 26 db @ L1. The 50 db spec is for L1 +- 40 MHz.
I looked inside mine and found that there's an input filter(-1db), 21 db
amp, 4 way resis
On 10/12/2012 01:15 AM, Azelio Boriani wrote:
To test this kind of items, you have to play with DC-blocks and bias-tees.
Rather tedious but necessary. I know as at times I have to test
questionable GPS antennae that return after lightning strikes.
I did check that the supplied voltages is withi
Azelio,
Not at all the satellite splitters can be smart or passive. I use a passive
so it has 1 dc path. But all of the other ports have dc blocks built in.
The smarter units will direct the highest DC to the antenna. Its really
diodes and I stay clear of those. To smart for there own good.
Plus wi
To test this kind of items, you have to play with DC-blocks and bias-tees.
Rather tedious but necessary. I know as at times I have to test
questionable GPS antennae that return after lightning strikes.
On Fri, Oct 12, 2012 at 1:09 AM, paul swed wrote:
> Magnus what would the possibility be of me
Magnus what would the possibility be of measuring an 8 way satellite
splitter? The $7 wonders with dc pass through. That looks like a very nice
network analyzer you have.
Regards
Paul
WB8TSL
On Thu, Oct 11, 2012 at 7:05 PM, Magnus Danielson <
mag...@rubidium.dyndns.org> wrote:
> On 10/12/2012 12:
On 10/12/2012 12:16 AM, Azelio Boriani wrote:
Please take care that the S14WI is "smart": if it doesn't sense a DC
current on the antenna port then it reports that to the user ports and I
think it can even power off the internal amplifier, this can account for
the observed loss instead of the gai
Please take care that the S14WI is "smart": if it doesn't sense a DC
current on the antenna port then it reports that to the user ports and I
think it can even power off the internal amplifier, this can account for
the observed loss instead of the gain.
On Thu, Oct 11, 2012 at 11:20 PM, Magnus Dan
On 04/13/2012 12:19 AM, iov...@inwind.it wrote:
> Just found on the auction site:
> Item number: 220957196441
> Specs available at the manufacturer's website.
> I have no idea if it is worth the price.
It feels mechanically indestructible, and works.
I have a tbolt powering it, and a 3.3V (sky
I have one, it is OK.
On Fri, Apr 13, 2012 at 12:19 AM, iov...@inwind.it wrote:
> Just found on the auction site:
> Item number: 220957196441
> Specs available at the manufacturer's website.
> I have no idea if it is worth the price.
> Might be of interest.
> Antonio I8IOV
> Note: I'm not affili
Just found on the auction site:
Item number: 220957196441
Specs available at the manufacturer's website.
I have no idea if it is worth the price.
Might be of interest.
Antonio I8IOV
Note: I'm not affiliated.. etc ...etc..
___
time-nuts mailing list -- t
If the thunderbolt is already supplying 5V to the antenna, then I would
leave the antenna power pin open (no power) on the Jupiter.
Jason
>OK so the splitter is a mini circuits ZAPD-21 .5 - 2 Ghz splitter.
>The center doesn't have a path to ground.
>I mounted it on my rack next to my Thunderbolt
OK so the splitter is a mini circuits ZAPD-21 .5 - 2 Ghz splitter.
The center doesn't have a path to ground.
I mounted it on my rack next to my Thunderbolt clone and hooked it up
leaving the other port open.
The thunderbolt appears to be working fine and I have 5 volts on the center
pin.
The
do it, A small inductor in series with the resistor will reduce
signal loss.
Robert.
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of [EMAIL PROTECTED]
Sent: 21 February 2007 05:11
To: time-nuts@febo.com
Subject: [time-nuts] GPS splitter
So I have a bun
In a message dated 2/21/2007 06:13:52 W. Europe Standard Time, [EMAIL
PROTECTED]
writes:
So I have a bunch of these mini-circuits splitters that cover 500 - 2000
Mhz. It has continuity on all ports. Has anyone tried something like this to
use
a single GPS antenna on 2 receivers? They
So I have a bunch of these mini-circuits splitters that cover 500 - 2000
Mhz. It has continuity on all ports. Has anyone tried something like this to
use
a single GPS antenna on 2 receivers? They both put out 5 volts on the center
pin. Maybe a cap on one of the ports?
***
53 matches
Mail list logo
