Hi Patrick,
You might use sim2powersdr.exe from here:
http://www.sm5bsz.com/lir/sim2/sim2.htm
This program converts other 96 kHz .wav files to the PowerSDR
format. Maybe it will not convert all possible 96 kHz .wav
files, but it is a simpåle program available as source code.
73
Leif / SM5BSZ
Hi 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
Hi All,
What I want to see is someone design a tuneable preselector with many
adjustable parameters.
At these frequencies and with a load impedance of 50 ohms
you can come a long way with a good 1 mH inductor and a
tuneable capacitor in series with the antenna. The 1 mH
inductor is in the
Hi Jeff and all,
But I do some longwave listening with my old Kenwood TS-850/HF
vertical and often hear European AM broadcast stations in the
150-200 kHz range even from my QTH in Missouri. Radio France
Inter can often be heard from local sunset until
sunrise in Europe on 162 kHz. The BBC
Hello Mark,
Man made interference is typically very different from
white noise and in principle possible to eliminate.
Something that is present over many MHz bandwidth is
a strong signal that could be evaluated with very
high precision and then subtrated provided one looks
for it in a wide
Hi Mark,
Just got a (relatively) inexpensive headset with boom microphone from
Yamaha. It says it has flat response across voice spectrum.
Questions:
1.Is it worthwhile to use the SDR software to check this? Will it be
accurate?
To check you need an audio signal with flat response.
Hi All,
The beauty of SDR is that we have the RF signal in digital form.
In this discussion of AM detect algorithms it could be very
useful if those of you who observe signals that are not
detected well would make raw data files available.
In case a bad audio quality is observed with a
Hi Brett and All,
Mostly on strong AM ham transmissions on 80 meters, the homebrew receiver is
clear, the 3000 is nasty.
I do not remember anything like this on the 5000 I had a few years ago.
I think I would like to go back to an older version of psdr which seemed to
work better for
Hi Robert,
There are many hams that swear up and down that their K3's are software
defined. I try to explain to them that their k3 rigs are software
enhanced, but not truly software defined.
Many hams including some very bright engineers that are in the club
still think that their k3's
Hello Brian,
My opinion is that with digital processing it is impossible to eliminate the
delay completely, so if sidetone is preferred it needs to be generated at
the key.
It is not impossible at all. One just has to avoid errors.
The PowerSDR software runs fine with a Delta44 soundcard
and
Hi Brian,
I have tested the different parts of the delay with Linrad, and
I have also tested PowerSDR on the fast computer. The delay I
find with PowerSDR is what should be expexted. The delay depends
on the ASIO buffer size and on the DSP buffer size. With both
set to minimum the
Hi All,
On Sun, 20 Nov 2011 21:33:28 -0500
William H. Fite omni...@gmail.com wrote:
Nonetheless, what is evolving is the shared understanding that in order to
extract all the delicious juices from the SDR-fruit, one probably needs to
devote a powerful machine to that purpose.
.
.
.
On Sun,
Comcast is blocking my mail.
Do you have another E.mail address?
73
Leif / SM5BSZ
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Hi Alfred,
You can see it on the waterfall. I always operate with the panadaptor
and waterfall displayed, and can click on the signal of interest. I was
wondering if you had an automatic way of doing that.
No. There are typically many signals and I have no idea
about what the operator would
Hi Alfred,
The signals I am talking about are at or just below the noise level.
Once the signal is +3dB or better then NR can make it more pleasant to
copy because I find it less fatiguing, but it certainly would be
copyable anyway.
That is what I have concluded from making some tests.
I
K0DAN k0...@comcast.net wrote:
You're right, there's many types of noise. A few (for example ignition
pulse) is easily handled
Yes:-)
but that damn propagation frying noise, power
supplies, splatter, etc., are another matter altogether.
Yes. I am trying to build a library of
Hi Tony,
There is a lot of literature on this subject, just a Google away. There are
also labs devoted to developing commercial applications of DSP noise
reduction. Here are some links:
http://www.dspalgorithms.com/products/nr.html
http://www.bhi-ltd.com/
Hello Bill,
Part of the problem may be a matter of PC processing power forreal-time
noise removal. I use audio editing software on my PC that does an
outstanding job of removing complex noise from audio recordings.
However, it takes over 10 seconds to clean-up 1 second from a recording,
Hello Dan,
I have read, and now believe, that analog rigs with
their crystal filters lengthen the noise pulses,
making them harder to get rid of
Yes. That is absolutely true. Here is an extreme example:
http://www.sm5bsz.com/lir/recordings/static-rain.htm
Static rain needs a sampling
Hi David and all,
Just found a nasty little feature in Win/Vista and Win/7, named
audiodg.exe. This is a required audio driver that attempts to
isolate processes audio routing graphs for security purposes. Problem
is, the cure is almost as bad as the disease they are trying to prevent.
Hi Zack,
Does anyone have any thoughts as to the source of the spurs
on 50 Mhz at my QTH? Please see the first photo here. I
would really like to eliminate them if possible.
http://www.flickr.com/photos/10025089@N05/?saved=1
I suggest you take notes where the strongest signals are.
Use
Hi Mike,
Here we suffer a lot with EU stations tuning right on top of the DX
signal, a simple notch removes them enough to be able to make out what
the DX
station is sending underneath.
The 25hz filter is great, but doesn't help like a notch does when the
QRM'er is on the same freq.
I
Hi Neal,
It should not because it would be a waste of resources for
absolutely no reason.
SDR-14 and SDR-IQ use USB 1.0 and they can do something between
160 kHz and 230 kHz depending on hardware and operating system.
The fastest system I have seen was a Linux machine.
The latency is determined
Hi All,
There have been discussions over the years about AGC in good
old analog recevers as compared to AGC in modern receivers that
use DSP for the final filters and the AGC.
It is not obvious what kind of testing one should perform to find
out whether an AGC design is good or not so good. I
I am sorry.
I have publicly made unfounded accusations against Flex Radio.
I now know that I was wrong. Flex Radio has an amazing algorithm
Wide Band Image Rejection that finds the appropriate complex
coefficients for image cancellation very fast.
When testing the filters in SDR softwares I
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