Hi Dave, Ah I meant a 1600Mhz AM RX not a MW job the resuly is quite
dramatic from seeing no usable satelites to seeing 10 to 12. The software we
are running plots the tracks of the those sats seen so we can see that when
seen even close to trees, foliage shielding is not a problem. I could post
Hi Tom Brilliant I hadnt thought of the fields actually affecting the
operation of the electronics! that is certainly something that might be
interesting to check. I note there lines have three phase feeds but no
neutral wire so they must use ground as the return path to any unbalance
currents.(?)
On Sun, 10 Aug 2008 10:27:31 +0100, Alan Melia wrote:
I note there lines have three phase feeds but no
neutral wire so they must use ground as the return path to any unbalance
currents.(?)
As long as the system is kept balanced a 3 phase energy transport
system does not need a 4th wire as
Alan Melia wrote:
Hi Tom Brilliant I hadnt thought of the fields actually affecting the
operation of the electronics! that is certainly something that might be
interesting to check. I note there lines have three phase feeds but no
neutral wire so they must use ground as the return path to any
Arnold Tibus wrote:
As long as the system is kept balanced a 3 phase energy transport
system does not need a 4th wire as the sum of all the currents in the 3 wires
(phase shift 120deg between the wires) is zero!
regards
Arnold, DK2WT
That is true Arnold, but in the UK (and in some other
Around all high voltage lines the air is somewhat ionized and this
may result in sufficient free electrons to seriously mess up the
GPS signal, although I wouldn't expect much trouble from a 11kV
line.
The fact that the navigation message is 50Hz in the GPS signal and
the power-grid in the UK is
Poul-Henning Kamp wrote:
The fact that the navigation message is 50Hz in the GPS signal and
the power-grid in the UK is close to 50Hz is not a good thing
in any case.
By UK law, it must be within +/- 1% of 50Hz. :-)
Dave (G0DJA)
___
time-nuts
Hi Didier, thanks for that idea, yes they were all pucks all Garmin two
intended for marine use and one was a old Garmin GPSIIplus with a mag
puck. I have a Trimble Palisade that I have not got round to working on
yet, but I understand that there are problems putting this version into NMEA
Alan Melia wrote:
Hi Didier, thanks for that idea, yes they were all pucks all Garmin two
intended for marine use and one was a old Garmin GPSIIplus with a mag
puck. I have a Trimble Palisade that I have not got round to working on
yet, but I understand that there are problems putting this
In message [EMAIL PROTECTED], David Ackrill writes:
Poul-Henning Kamp wrote:
The fact that the navigation message is 50Hz in the GPS signal and
the power-grid in the UK is close to 50Hz is not a good thing
in any case.
By UK law, it must be within +/- 1% of 50Hz. :-)
Yeah, but the fact that
Alan,
I recommend you look for an HP 58532A. I bought a brand new one on eBay for
$50 BIN, sometimes you can do better. This is a good timing-grade antenna,
and intended to stay outside for a long time. They have good filtering and
the LNA is shielded.
Didier KO4BB
-Original Message-
Hi,
In car radio capacitive antennas are used. The required LNA rejection
for the power line frequency is in the order of 100dB.
henk
On Aug 10, 2008, at 15:16, Alan Melia wrote:
Hi Didier, thanks for that idea, yes they were all pucks all
Garmin two
intended for marine use and one was
Around here they place cell antennas on a monopole down the center
of power transmission line towers. The GPS antennas are invariably
directly below the 100-200kv lines. The GPS signal must be reliable
enough or the cell sites wouldn't be there.
Scott
Alan Melia wrote:
Hi all, in
On Sun, 10 Aug 2008 13:05:47 +0100, David Ackrill wrote:
Arnold Tibus wrote:
As long as the system is kept balanced a 3 phase energy transport
system does not need a 4th wire as the sum of all the currents in the 3
wires
(phase shift 120deg between the wires) is zero!
regards
Arnold,
On Sun, Aug 10, 2008 at 1:42 PM, Scott Mace [EMAIL PROTECTED] wrote:
ntpshm_put() needs to be called in the 0xab case as well for ntp to work.
done.
--- gpsd/trunk/tsip.c 2008-08-08 23:38:27.0 -0500
+++ ../gpsd/trunk/tsip.c2008-08-09 04:14:09.0 -0500
@@ -65,7 +65,7
Hi folks,
I've been following the mailing list for a few weeks using Pipermail (the
web-based archive) and I figured now was a good time to jump in (so to speak).
I'm working on a GPS-disciplined oscillator, based on a Trimble SVeeSix GPS
receiver, and a homebrew OCXO. I've got a pair of
Philip Pemberton wrote:
Hi folks,
I've been following the mailing list for a few weeks using Pipermail (the
web-based archive) and I figured now was a good time to jump in (so to speak).
I'm working on a GPS-disciplined oscillator, based on a Trimble SVeeSix
GPS
receiver, and a
Philip
When using a crystal in an oven you should use a crystal specified for
oven operation at a specific temperature.
The crystal frequency should be specified for the desired oven temperature.
For example for an AT cut crystal the crystal frequency can be
approximated by as a cubic function
Hello Philip,
I agree with Bruce about the digital stuff and semiconductor
temperature sensors, etc. From your commentary I think you should do
some reading before proceeding. Here are some suggestions;
The first is a series of Application notes from Agilent (old hp test
div)
You didn't say if you tried the antenna under the power lines but
outside the cabin. What is translucent to light may not be to microwaves.
David N1HAC
At 05:15 PM 8/9/2008, you wrote:
Hi all, in the process of setting up a GPS time standard for a Radio
Astronomy facility (amateur) we
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