This version is a slight modification of 01.28, which added the noise
blanker. The only changes are to the cursors in DATA A mode and another
minor bug fix involving the FN1 label. It can be uploaded from the P3
beta web site:
ftp://ftp.elecraft.com/P3/firmware/beta/p3m0129.zip
Un-zip the file into the directory that P3 Utility uses for firmware.
Make sure you have the most recent version of P3 Utility (1.13.1.23).
The p3fwnotes.rtf file lists the new features and bug fixes since the
last official release.
Below is some text I will be submitting for the P3 Owner's Manual to
explain the new noise blanker feature.
Alan N1AL
=================
Noise Blanker
The noise blanker in the P3 reduces the effect of impulse-type noise on
the display. It has little or no effect on other types of noise such as
thermal noise and static crashes but can dramatically reduce impulse
noise from sources such as the AC power line and the ignition systems of
motor vehicles.
The noise blanker is turned on or off using the menu entry "NB En" which
can be assigned to a function key for easy access. You can adjust the
aggressiveness of the noise blanker algorithm with the menu entry "NB
Level". The higher the setting the more completely it blanks the noise
but also the more likely it will cause distortion of desired signals.
Use the lowest setting that effectively blanks the noise. A value of
about 10 or 11 is a good starting point for experimentation. Note that
the REF LVL and SCALE settings have no effect on the noise blanker.
If there are one or more very strong signals within the P3 displayed
frequency range, the noise blanker has a hard time detecting the
difference between the unwanted pulses and the wanted signals. The
solution is to narrow the span and/or offset the center frequency
(perhaps using fixed-tune mode) to place the strong signals well outside
the P3's display range.
=================
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