My Advantest spectrum analyzer now comes up with an
error 900 complaining about no PLL lock.
This would appear to be a fault on the PLL board but the
brain damaged Advantest service manual has no schematics
for the boards.
Any suggestions other than don't buy anything from Advantest?
--
Björn,
On 01/16/2015 12:01 AM, Björn Gabrielsson wrote:
Magnus,
I naturally meant with a reasonable price-tag, sorry for being sloppy on
that detail, and I do know that there is vendors for those signals.
If we had dual or triple frequency receivers below 500 USD things would
start to be
Hi
Usually (but not always) these are VCO drift issues. If you can spot a tuning
adjust on that board you are lucky. A lot of this stuff is now done “no adjust”
boards. They just swap out the board …
Bob
On Jan 16, 2015, at 12:27 AM, Chuck Forsberg WA7KGX c...@omen.com wrote:
My
Hi
I have a question about the GPS antenna. Since the GPS signal strength on
the ground is about 20db lower than the thermal noise, does the gain of
antenna matter?
2015-01-16 7:01 GMT+08:00 Björn Gabrielsson b...@lysator.liu.se:
Magnus,
If civilian receivers where to implement L2C and L5
On 1/16/15 4:58 AM, Li Ang wrote:
Hi
I have a question about the GPS antenna. Since the GPS signal strength on
the ground is about 20db lower than the thermal noise, does the gain of
antenna matter?
Not a whole lot.. Obviously, you don't want something -10dBi, and there
is a direct effect
Chuck if its not a totally integrated PLL board then you might reverse
engineer it and go from there.
As Bob says thats harder and harder to do because adjustments are done in
software and theres a big black chip with no clue these days. Technically
speaking WAS (we are screwed). :-) Or in a
Hi,
Well, if you can avoid reception from ground you avoid both handling
reflexes as well as the thermal noise (300K vs. 3K).
You can't have higher antenna gain, since you want to receive fairly
omni-directional above the horizon, with maybe the first 5-10 degrees
nulled out.
What however
Hi,
Well, there can be steerable pots, DACs, DDSes and other similar
settings, but it may need the control which has not been left for either
users or service stations. This is sufficient to make enough boards go
through factor testing and out as sold products.
We didn't use to have
Hello all.
I am a Freq-nut recently joining the Time-nut list.
I am putting together the parts for the Shera VXCO controller using the
AA PCB.
What are folks using now a days for the Burr-Brown PCM-61P DAC?
I can not find the Analog Devices AD1861N chip anywhere either. I do see
the
Hi,
I've took the time to read carefully your long and detailed message Magnus and
this was very interesting. I've learned many things that have enabled me to
investigate further. Ah yes, you're right saying that the more you fall into
these things, the more you discover that you have to
Hi All,
I've been playing a Ublox 6T receivers on a synergy SSR-6Tru module.
The unit has been running as part of a GPSDO. In logging the phase
between GPS PPS and OXCO, a few days ago the normally small amplitude
short term (10s to ~500s) phase wander became rather erratic. For the
Hello Dan,
I have a LEA-6T running; have a nice external antenna, etc - it's been
running for several days - I will check the 1PPS and report if I find
anything like what you've discussed.
Regards,
John
On Fri, Jan 16, 2015 at 4:03 PM, d...@irtelemetrics.com wrote:
Hi All,
I've been
I have noticed the sudden improvement of the PPS wander after the
survey on a LEA-5T but the RMS wander is 30ns (see the timing appnote
GPS.G6-X-11007 from uBlox) uncorrected and 15ns if sawtooth corrected.
Your 3ns is strange, not the 30ns.
On Sat, Jan 17, 2015 at 1:03 AM,
Hi
It sounds like you are not doing sawtooth correction. If that is correct, then
you may have been watching hanging bridges.
Bob
On Jan 16, 2015, at 7:03 PM, d...@irtelemetrics.com wrote:
Hi All,
I've been playing a Ublox 6T receivers on a synergy SSR-6Tru module. The unit
has
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