Noise blanker fails on adjacent strong signals.
- View SourceHi All,
Noise blankers are sometimes very efficient in reducing man made
noise. It is well known however that strong signals within the
blanker bandwidth often renders the blanker useless.
Today, with SDR technology it is possible to do much better, but
as far as I know not very much work has yet been put into developing
I write this mail because I want to come in contact with people who
have these specific circumstances in receiver operation:
1) Strong local QRN (preferrably powerline in dry weather that
disappears in rainy weather.)
2) A conventional noise blanker works well and reduces the
interference by at least 3 S units (when there is no strong
signal on an adjacent frequency.)
3) The ability to copy weak signals is completely lost when a
strong signal is present on an adjacent frequency because
the blanker will then not work.
4) In case the problems are detected with some conventional
transceiver, an attempt to resolve it by use of a SDR
system (borrowed or your own) has not led to a significant
In case you find yourself as a candidate to meet the above
requirements I have a great interest in getting wideband
recordings from a SDR system at your location.
Please respond to leif[[[at]]]sm5bsz.com
Some QRN situations can already be managed quite well with
Linrad and I need good examples to demonstrate how to use
the Linrad noise blankers.
Other QRN situations can not be well managed within Linrad
and I am interested in the wideband recordings to be able
to use them for the developmment of better algorithms.
Leif / SM5BSZ