Bill et al :
Laurie's signal showed the same frequency pattern after each long break
- the excursion looks like a decaying sinusoid with two cycles of wobble
before settling down. Clearly a temperature effect as the transmitter
cycles. If your readout accuracy is 0.05Hz, that's well within my own
measurements.
As for colours in bitmap files.
Bill, I had exactly the same problem making a .BMP dump from the 16
colour VGA screen. You need to use the appropriate DOS interrupt to
read the palette information for the 16 colours, then store this in the
header of the .BMP file. I can let you have the code for this (In
PowerBasic) separately. If you don't do this, a default palette is
assumed which is correct for colours 0 to 7, but wrong for 8 to 15.
Also any redefined colours come out wrong. Guess there may be one or
two minor advantages in Windoze software !
Andy G4JNT
The frequency of G3AQC's signal varied from 135922.22 thru 135922.33 -
I'd say plus or minus 0.05 Hz is my calibration accuracy tonight.
The frequency of M0BMU's signal was very stable and I make it
135923.96.
I don't know why M0BMU showed up so much later than G3AQC and I don't
know why M0BMU was so much weaker here.
The images on my web page don't have the same colors as the
actual screen.
I'm still trying to figure out how to make a .BMP file that
will reproduce
the screen colors exactly when played back. My apologies for
the image
problems. I'll get it sorted eventually.
73 de Bill VE2IQ
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