s that
have the option to program a USB serial number (like the FTDI FT232R
based ones)
Joop - pe1cqp
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patched baud rate and
it will in effect behave as the custom baud rate.
Cheers,
Joop
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more
battery power and not contribute to the output. Actually power output
may be less. For more insight look here:
http://www.wenzel.com/pdffiles1/pdfs/choose.pdf
Cheers,
Joop - pe1cqp
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MHz.
Joop
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the cap in place.
The circuit I refer to can be seen here:
http://www.uploadarchief.net/files/download/cap2gnd.png
The first one is an output as described in the Efratom FRK manual, the
second one the input in the TADD-2 manual.
Cheers,
Joop
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time
wrong):
* you can open a window that shows all data that gets sent from the menu
commands.
* One can switch between NMEA / BIN (change baud rate in between)
* It allows sending commands where the checksum is calculated for you.
Cheers, Joop
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time-
al signal.
That might also explain why James G1PVZ was so successful. The bottom
2N918 might cause a lot of harmonics if driven into the collector cut-off.
Joop PE1CQP
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eds much more time to start locking.
I guess building something and measure it might be faster.
Joop
>Joop,
>
>you may also search for "synchronous oscillator". You will find for
example:
>
>http://www.amalgamate2000.com/radio-hobbies/radio/synchronous_oscillator
arch on "injection locking" and "synchronous oscillator"
results in a lot of conceptual descriptions but nothing that one can build,
try out and study. Maybe some of the scientific articles or books contain
circuits, but I am not a IEEE member.
Cheers,
Joop
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off)
>
> I guess my readings are all within the above specs. The retrace value is
> probably the limiting factor. 2.5E-11 translates in my setup to
90ns/hour.
> Which looks being reached already in about 2 hours after power-on. So if
> the Efratom is essentially the same as the Datum, then
rs after power-on. So if
the Efratom is essentially the same as the Datum, then all looks fine.
Joop
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o_24h.png
And this is with the LPRO is cold started. About 5 minutes after lock.
The GPS was already running for about an hour I have to guess. The LPRO
was not adjusted anymore.
http://www.uploadarchief.net/files/download/lpro_start7h.png
It is less flat at the last
On Mon, 08 Feb 2010 22:26:44 +0100, Joop wrote:
> The last point is guessing since my GPS signal is super stable. I
thought
Here I meant of course that my GPS 1Hz signal is NOT super stable.
Well, I thought it was until I bought the LPRO ;-)
Cheers,
J
24 hours. But powering it on two days later shows a higher drift
after 5 hours than where left before.
Also I would like to know if I have to repeat this procedure once it is
built into its final enclosure. Right now it is open on the bench and
clamped to a heatsink. Temperature might be di
leakage anymore. Should it have broken down
completely the problem would probably have been more easy to spot. Anyway,
it is replaced with a BAS116. Offset and sensitivity calibration went fine
and operation is back to normal.
Joop
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I suspect IC34 (CA3140E) might be having a
problem, but I did not dare to open the module yet. Is it placed in a
socket?
Has anybody experienced a similar problem and fixed it? Are some
capacitors known to go bad? Any help would be appreciated.
Cheers,
Joop
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