Peter,
My UT+ works ok with common antennas, I tested it with a Trimble
28367-00 and with a INPAQ AAF-03B 5V. Both are quite old garden
variety GPS antennas intended for car navigators so your problem can be
in the receiver.
I bought mine from fluke.l and he still have some available on his other
shop:
http://www.ebay.com/itm/130303889204?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649
<http://www.ebay.com/itm/130303889204?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649>
They are cheap enough to buy one as a spare just in case. Also you can
try with another antenna anyway, because the receiver checks only that
an antenna is connected (that is, the current range is right) but your
antenna could became defective.
Regards,
Ignacio
On 09/10/2011 7:52, Peter Bell wrote:
On Sun, Oct 9, 2011 at 3:31 AM, [email protected]<[email protected]> wrote:
Peter, do you have the software for this unit? The GPS antenna is supposed
to draw apx. 20 mA at 5 volts in order for the NO GPS LED to turn off. AT&T
(Lucent) used the MicroPulse timing antenna (later sold and now provided by
PCTE). You are correct in that Efratom used the Motorola UT+ 8 channel GPS
receiver on these units. The rubidium companion box used the data from the
same receiver (via an interconnect cable between the two units). Let me
know if you have questions on this unit, Regards, Doug....
Connected by DROID on Verizon Wireless
-----Original message-----
From: Peter Bell<[email protected]>
To: [email protected]
Sent: Fri, Oct 7, 2011 14:13:31 GMT+00:00
Subject: [time-nuts] Lucent RFTG-m-XO GPSDO
I have been playing with one of these units, and noticed that there
has been some discussion on them before on this list, so I wondered if
anyone might have any suggestions.
Basically, the unit powers up correctly, but the "No GPS" LED never
goes off - this obviously could be because it's broken or doesn't like
my antenna, but with some of these telecom GPSDOs you have to manually
trigger a site survey if you move them to another location. Does
anyone know if this Lucent box is like that?
Everything else seems to be working - once the "OK" light comes on the
15MHz output is enbled, the "No GPS" LED goes from solid to blinking
if you disconnect the antenna - it just doesn't want to get GPS lock.
I suppose I could pull the Oncore board (a UT+ according to the label)
out of it and test that on it's own - but I thiought I would see if
maybe it's a known issue first.
Hi, Doug
I don't have any documentation at all - just the actual box. The
antenna is one that originally came with a Furuno marine GPS, but the
spec looks plausible (+5V @ 40mA, Internal L1 preamp with 26dB gain -
and it has worked with several other GPS units without problems.
I just pulled the oncore out, and connected it up outside the box -
and it doesn't work. It passes the self test with a response code of
0000 (or 8000 with the antenna disconnected / 4000 with a short on the
antenna socket - so it seems the current consumption is OK) - but no
matter how long you leave it it still says it's tracking 0 satellites,
although it happiy generates status reports.
I wonder if this UT+ version is expecially sensitive to the antenna?
I remember that the oncore VP would work with pretty much anything you
hooked up to it. Of course, it's equally possible that the GPS module
is defective.
I'm tending towards broken - I also got an RTFG-m-RB with this unit,
and that has a faulty LPRO-101 in it (it's probably fixable - it looks
like the FET that heats up the Rb cell had gone open circuit) - and
the two units together only cost me $40 supplied on a "status unkown,
but likely defective" basis. I should get at least $40 of
entertainment out of trying to fix them :)
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