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Content preview: Wolf et al - thanks for this - Ive been playing during lunch time here in Anchorage using Teamviewer and listening to the derived audio out of Spec labs and tweaking the NB Trigger levels in the last Black box in Spec LaB - with my set up Ive set it to 10dB and average rise time constant on 5 secs (per recom) - that seems to (audibly) blank the lightning noise (actually not a lot here in Alaska at midday today which is kind of worrying :-) _ lower than this it severely cuts off and blanks too much off - per Pauls/Wolf suggestion I do have a 3Khz bandpass set in the blackbox between L1 and L2 - Im guessing noise content, color, levels and duration is untypical and empirically we have to deal with our own burbles..but base lines are a great start [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [65.55.116.12 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (hellozerohellozero[at]hotmail.com) -0.0 SPF_PASS SPF: sender matches SPF record -0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 4998b3eda037fec4e885bebc9a2db934 Content-Type: multipart/alternative; boundary="_d9ed4fd8-93d4-4e75-87c4-ddc601097150_" Subject: LF: Noise blanking X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.1 required=5.0 tests=FORGED_HOTMAIL_RCVD, HTML_FONTCOLOR_UNSAFE,HTML_MESSAGE,TO_ADDRESS_EQ_REAL autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false --_d9ed4fd8-93d4-4e75-87c4-ddc601097150_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable =20 =20 Wolf et al - thanks for this - Ive been playing during lunch time here in A= nchorage using Teamviewer and listening to the derived audio out of Spec la= bs and tweaking the NB Trigger levels in the last Black box in Spec LaB - w= ith my set up=20 Ive set it to 10dB and average rise time constant on 5 secs (per recom) - t= hat seems to (audibly) blank the lightning noise (actually not a lot here i= n Alaska at midday today which is kind of worrying :-) _ lower than this i= t severely cuts off and blanks too much off - per Pauls/Wolf suggestion I d= o have a 3Khz bandpass set in the blackbox between L1 and L2 - Im guessing = noise content=2C color=2C levels and duration is untypical and empirically = we have to deal with our own burbles..but base lines are a great start =20 Here Im using the audio out (nominal 1KHz offset for XBA) of the SLMS and n= ot using direct sound card on this one - noise level background during the = day is -106dBm and that seems only to vary a bit during the day - early eve= ning actually isnt too bad and only when Asia Pac "opens" does it really ge= t bad. =20 I do have a signalling system (probably power line) very close in to 29.499= which I can audibly here as a carrier - it appears to be on for about an h= our and then off for a few mins - you can actually see on my VLF wideband s= napper - I should really see if I can blank it out and put a short hole in = the passband =20 Heres hoping my neighbor stays out of his garage and leaves his noisy light= s off tonight -=20 =20 thanks for everyones help =20 Laurence KL7L XBA/5 XPQ =20 =20 Hi Paul and all=2C =20 Thanks for the notes about the importance of the impulsive noise blanker. Since there are still a few windows users on the group=2C here's how to=20 activate the noise blanker in spectrum lab=2C assuming that one of the "very slow" morse modes has already been picked=20 from the 'Quick Settings' menu: =20 Select 'Components' / 'Circuit window'=2C click on the 'DSP blackbox' between circuit nodes L4 and L5=2C select 'Noise blanker'=2C make sure to connect the spectrum analyser to 'L5' (not 'L4'=2C which=20 would be "before" the noise blanker). =20 =20 The NB defaults should be a good starting point=2C but as Paul pointed out= =20 we may need more aggressive blanking. This is controlled by the "Trigger Peak/ Average" settings (10 dB by=20 default=2C "the less=2C the more aggressive"). =20 Details about the noiseblanker settings: =20 http://www.qsl.net/dl4yhf/speclab/circuits.htm#noiseblanker =20 To remove signals which may irritate the NB (like strong MSK=20 transmitters or local QRM)=2C the FFT-based filter can be switched into=20 the signal path between 'L3' and 'L4'. For a quick start=2C begin with a simple bandpass=2C say 3 kHz bandwidth=2C= =20 centered around 29.5 kHz. =20 Details about that filter: =20 http://www.qsl.net/dl4yhf/speclab/filters.htm#fft_filter =20 As soon as my work on the WSQ program has finished=2C I will make a=20 configuration file which works "reasonably well" for this location=2C and=20 post it on a website. But I think the settings used below 9 kHz will=20 work reasonably well=2C but don't forget you need soundcard providing at=20 least 96 kSamples/second (select that sampling rate for input in the=20 audio settings). =20 =20 Good luck everyone=2C Wolf . =20 = --_d9ed4fd8-93d4-4e75-87c4-ddc601097150_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 =3B
 =3B
Wolf et = al - thanks for this - Ive been playing during lunch time here in Anchorage=  =3Busing Teamviewer and listening to the derived audio out of Spec lab= s and tweaking the NB Trigger levels in the last Black box in Spec LaB = =3B- with my set up
Ive set it to 10dB and average rise time constant o= n 5 secs (per recom) - that seems to (audibly) blank the lightning noise (a= ctually not a lot here in Alaska at midday today which is kind of worrying = :-) _  =3Blower than this it severely cuts off and blanks too much off = - per Pauls/Wolf suggestion I do have a 3Khz bandpass set in the blackbox b= etween L1 and L2 - Im guessing noise content=2C color=2C levels and duratio= n is untypical and empirically we have to deal with our own burbles..but ba= se lines are a great start
 =3B
Here Im using the audio out (nomi= nal 1KHz offset for XBA) of the SLMS and not using direct sound card on thi= s one - noise level background during the day is -106dBm and that seems onl= y to vary a bit during the day - early evening actually isnt too bad and on= ly when Asia Pac "opens" does it really get bad.
 =3B
I do have a= signalling system (probably power line) very close in to 29.499 which I ca= n audibly here as a carrier - it appears to be on for about an hour and the= n off for a few mins - you can actually see on my VLF wideband snapper - I = should really see if I can blank it out and put a short hole in the passban= d
 =3B
Heres hoping my neighbor stays out of his garage and leave= s his noisy lights off tonight -
 =3B
thanks for everyones help<= BR> =3B
Laurence KL7L =3B XBA/5 XPQ
 =3B
 =3B
H= i Paul and all=2C

Thanks for the notes about the importance of the = impulsive noise blanker.
Since there are still a few windows users on th= e group=2C here's how to
activate the noise blanker in spectrum lab=2C<= br>assuming that one of the "very slow" morse modes has already been picked=
from the 'Quick Settings' menu:

Select 'Components' / 'Circuit= window'=2C
click on the 'DSP blackbox' between circuit nodes L4 and L5= =2C
select 'Noise blanker'=2C
make sure to connect the spectrum analy= ser to 'L5' (not 'L4'=2C which
would be "before" the noise blanker).

The NB defaults should be a good starting point=2C but as Paul p= ointed out
we may need more aggressive blanking.
This is controlled = by the "Trigger Peak/ Average" settings (10 dB by
default=2C "the less= =2C the more aggressive").

Details about the noiseblanker settings:=

http://www.qsl.net/dl4yhf/s= peclab/circuits.htm#noiseblanker

To remove signals which= may irritate the NB (like strong MSK
transmitters or local QRM)=2C the= FFT-based filter can be switched into
the signal path between 'L3' and= 'L4'.
For a quick start=2C begin with a simple bandpass=2C say 3 kHz ba= ndwidth=2C
centered around 29.5 kHz.

Details about that filter:=

http://www.qsl.net/dl4yhf/spec= lab/filters.htm#fft_filter

As soon as my work on the WSQ= program has finished=2C I will make a
configuration file which works "= reasonably well" for this location=2C and
post it on a website. But I t= hink the settings used below 9 kHz will
work reasonably well=2C but don= 't forget you need soundcard providing at
least 96 kSamples/second (sel= ect that sampling rate for input in the
audio settings).


G= ood luck everyone=2C
Wolf .
 =3B
= --_d9ed4fd8-93d4-4e75-87c4-ddc601097150_--