Hello Mark,
I guess the problem with the Javascrip refresh method is this:
The javascript begins to update the screen, regardless of the transfer
speed. Even if the previous update isn't finished, it begins a new
update. If, for example, the transfer of the image requires 25 seconds,
but the Javascript tries to update it every 2 seconds, there will be
endless activity but no new screen because the embedded image is only
update when it's complete (this reduces flicker, and is the main
difference between the javascript page, and the simple java-less page
which updates itself through an html meta tag) .
What Graham could try is to enter a larger value in the "Refresh
Interval" box at the bottom of the screen (on Mark's "index" page with
the 500 kHz spectrogram). For example, set the update interval to 30
seconds (the default was 2 seconds, which was my mistake, because 2
second refresh only works through a local network).
As long as you permanently see the message "transferrig data from
82.something" on the bottom of your browser (but never the "Ready"), you
know that your browser requests the image too often. With 30 second
refresh, I get a stable periodic refresh from Mark's MF viewer.
If we have a Javascript expert here: Any idea how a Javascript (embedded
in an HTML document) can detect if all embedded graphics have been
updated ? In that case, the "refresh" interval could be restarted after
the previous refresh is finished.
Best regards,
Wolfgang "Wolf" DL4YHF .
Graham schrieb:
Mark,
Just had a look, but only seeing a small strip at the top of the
screen, which is flickering , only way to view full page, is to
click on the 'slow' link ..
Graham ..
----- Original Message -----
*From:* Mark <mailto:[email protected]>
*To:* [email protected]
<mailto:[email protected]>
*Sent:* Thursday, January 03, 2008 9:43 PM
*Subject:* LF: GM4ISM 500KHz Grabber
Gents,
Thanks to Wolfgang DL4YHF, the grabber at my QTH is now running a
new beta version of Spectrum lab, that should stop the problem of
multiple users getting partial images.
After an initial rush of activity, the number of users has calmed
down, rather as expected.
Feel free to jump on board and try to break it again!
The system is connected to my main antenna but this is at minimum
height and not correctly matched. Still it works pretty well and
many signals were visible last night.
I have also got the magnetic antenna working, (placed temporarily
on the shed roof) and it will be re-mounted when the weather
permits, it seems slightly better than the reduced height main
antenna.
I dont have the fantastically low noise floor that John GM4SLV
offers, but I hope to leave the grabber running for the duration
of the UK experiment or longer, if it is considerd useful. It is
far enough away from other grabbers to perhaps be of some use for
the experiment. It is also a testing ground for possible similar
systems at SHF giving 'inverse' beacons for propagation indication.
any comments or problems encounterd, please let me know!
Regards
Mark GM4ISM
www.dc2light.co.uk <http://www.dc2light.co.uk>
follow the MF / LF link, at the bottom of the page is the grabber
link.
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