Hi Phil

   I had suggested Pass Band Tuning to address

basically the same thing. I do this with my Icom R-75

And really seems to work well. I use NR-3 on SSB signals

Now, but unless the signal is strong enough there is

A squeal ( same as increasing the r-75 DSP to high). I know

NR-3 is overkill for cw..but maybe Simon could look at the common

Factor between the two. Since I'm not a programer not sure

What is possible.

Jim swl/utility dx'er

Jim's iPhone 3GS 

On Aug 2, 2010, at 12:53 PM, "ic8pof" <ic8pof@yahoo.com> wrote:

 

HI Simon and All.
The background noise in long SWL_ing sessions is very "stressy".
Could be possible to add a sort of Noise_Reducer if no signal is present in the passband ?
I do much CW listening and the more narrow the filter is the more HISS
comes from the speakers.
I have already tried to keep NR-1 ON at minimum, but the reduction on the background HISS is not much effective.
73
Phil

__________ Information from ESET Smart Security, version of virus signature database 5335 (20100802) __________

The message was checked by ESET Smart Security.

http://www.eset.com

 

HI Simon and All.
The background noise in long SWL_ing sessions is very "stressy".
Could be possible to add a sort of Noise_Reducer if no signal is present in the passband ?
I do much CW listening and the more narrow the filter is the more HISS
comes from the speakers.
I have already tried to keep NR-1 ON at minimum, but the reduction on the background HISS is not much effective.
73
Phil

Hi,



This is something I can look at later, at the moment I need 48 hours in each
day. Adding Doppler shift in the SDR-RADIO.com console would be very easy as
I have the logic in another DLL. Adding Doppler would remove any need for
ECSS and the FM demodulation should be perfect as long as:



1) You enter your location correctly, and

2) The satellite's Kepler data is up to date.



As soon as I have my Satellite-capable SDR receiver I can try this. It would
only take a few days to add the Doppler support.



As for demodulation of the pictures - this would also be interesting.



Simon Brown, HB9DRV

http://sdr-radio.com



From: sdr-radio-com@... [mailto:sdr-radio-com@...]
On Behalf Of jorschei
Sent: 02 August 2010 14:58
To: sdr-radio-com@...
Subject: [sdr-radio-com] Tracking a Satellite APT signal in the ECSS mode in
SDR.





Hi Simon,

I don't want fire up competition bud exchange ideas of possible features in
SDR software.
I did an ECSS experiment with WINRADHD, tracking a Satellite APT data within
the filter pass band.
An option for future releases? See in the files for report.

73' Joris PE1KTH

 

Hi,

 

Did something different over the weekend - can't write code seven days a week, especially when the weather is so good.

 

Anyway I'll release a kit when the current 'new surprise' is working, or at least can be used to some extent. I'll not give anything away at the moment but no other SDR program has this feature - or should I say 'these features'?

 

Simon Brown, HB9DRV

http://sdr-radio.com

 

From: sdr-radio-com@yahoogroups.com [mailto:sdr-radio-com@yahoogroups.com] On Behalf Of jmiles56@sbcglobal.net

well sunday has come and almost gone here...but then you didn't say any particulair one..so maybe next sunday..;-) Whenever it make it out I'm sure it will be good.

 

I'll try to get a kit out on Sunday with the new features I've been working
on.



Simon Brown, HB9DRV

http://sdr-radio.com

I plan to put the DM780 decoder in the console as a small docking window
with its own waterfall. I'll also integrate DM780 via (probably) TCP/IP, but
I also see that a small digital mode decoder would be very handy.



The DM780 encoder / decoder is written in its own DLL so integration is very
easy.



Simon Brown, HB9DRV

http://sdr-radio.com



From: sdr-radio-com@... [mailto:sdr-radio-com@...]
On Behalf Of robengberts

when CW (and rtty) is also in the console that would be great, I think at
the end it will be 'all in one' sdr software hi!

Hi Alex,

There is not yet any installer for Linrad. It does not matter
into what directory you put the executable. Just make an
empty directory of your choice and unpack the .zip file
into it.

In case you want to adhere to the standard that will come with
the installers, make the Linrad directory here:
C:&#92;Program Files&#92;linrad&#92;linrad-03.08 or here
C:&#92;Program Files&#92;linrad&#92;linrad-03.13
Depending on which version you have downloaded.
In case you run Windows 200 or Windows 98 the location
would be C:&#92;Program&#92;linrad&#92;linrad-03.xx

When you have linrad.exe, errors.lir and help.lir in a directory,
open Windows explorer and go to the Linrad folder. Right click
linrad.exe inside Windows Explorer. That will open a menu in which
you should click on "Send To" which will open yet another menu
in which you should click on "Desktop" That would create a desktop
icon which you can use to start Linrad from the desktop. (Standard
procedure in Windows.)

As an alternative you can open a command window and go to the
Linrad directory with the cd command and just type "linrad".

Depending on the version you might find that Linrad can not
start because a dll file is missing. You can download the
dll files from the Linrad Home Page:
http://www.sm5bsz.com/linuxdsp/linrad.htm

Right now I am re-writing that page and it will soon have a
more logical structure in which the Linrad installation is
described as a three separate procedures:

1) Install the executable.
2) Install dll files in your system directory.
3) Install the drive routines for your hardware.

The procedures 2 and 3 are to be done once and for all.
The first procedure has to be repeated separately for each
version of Linrad that you might want to install.

There will be installers for the procedures 1 and 2.
(Christoph Peterman, DF9CY is helping me with that.)

Instructions about the proper installation of your hardware
and its drive routines should be the responsibility of
your hardware manufacturer, but for example the Perseus
HF receiver needs a dll and some other binaries that have
to be made available to Linrad. (They can be copied into
the system directory - or all of them could be present in
every Linrad directory.) There will be an installer for
this.

There are many problems with soundcard drive routines
under Windows but that has nothing to do with Linrad.
Driver problems (nice wording for software bugs) may
cause bad behaviour with glitches or mis-aligned samples
on the input or excessive time delay from antenna to
loudspeaker and even extremely high cpu load. Do not
expect every hardware to have well behaved drive
routines for every version of Windows.......

73

Leif / SM5BSZ

I've reviewed quite a bit of your Linrad website and I'm quite impressed. I downloaded the executable that you recommended etc, but I'm having difficulty getting the preferences to stick and I'm not able to get the program to work. I'm sure it's something simple. One of the reasons that I think that I'm having troubles is that I haven't found a file or folder that has all the items necessary in an easy, automatic extractable manner. I'm sure I'm not looking in the right place. Can you please let me know where this file or folder would be ?
Thanks
Best regards.
Alex

--- In sdr-radio-com@..., Leif Asbrink <leif@> wrote:

Hi Alex,

The measurement of power vs time is implemented in the S-meter function
of Linrad which is the same regardless of mode. Although similar
(in a way) to AM the RMS power vs time and the peak power vs time
curves typically represent some kind of averaged values. In Linrad
the peak detector shows the peak power within the selected bandwidth
over a time span corresponding to one pixel in the S meter graph.
You can make it as slow as you want. The RMS power is averaged over
the time corresponding to one pixel. At the maximum speed for
the S meter graph the RMS and the peak power is the same. Both
reflect the power at a given moment in time with an S-meter graph
that updates rapidly enough to measure the momentary power
within the selected bandwidth. I think Linrad is directly applicable
to the Mil 461 standard as specified below by use of the S-meter
graph. (Regardless of receive mode.)

73

Leif / SM5BSZ

I reviewed the Mil 461 bandwidth and detector requirements application. The
bandwidth requirements are specified at the 6 dB points for the following
bandwidths: 10 Hz, 100 Hz, 1 KHz, 10 KHz, 100 KHz, 1 MHz. For the detector,
to avoid confusion, I'm including a portion of the excerpt verbatim as follows:

"A.4.3.10.1 (4.3.10.1) Detector.
A peak detector shall be used for all frequency domain emission and
susceptibility
measurements. This device detects the peak value of the modulation envelope in
the receiver
bandpass. Measurement receivers are calibrated in terms of an equivalent Root
Mean Square
(RMS) value of a sine wave that produces the same peak value. When other
measurement devices
such as oscilloscopes, non-selective voltmeters, or broadband field strength
sensors are used for
susceptibility testing, correction factors shall be applied for test signals to
adjust the reading to
equivalent RMS values under the peak of the modulation envelope.
Discussion: The function of the peak detector and the meaning of the output
indication on the
measurement receiver are often confusing. Although there may appear to be an
inherent
discrepancy in the use of the terms "peak" and "RMS" together, there is no
contradiction. All
detector functions (that is peak, carrier, field intensity, and quasi-peak)
process the envelope of
the signal present in the receiver intermediate frequency (IF) section. All
outputs are calibrated
in terms of an equivalent RMS value. For a sine wave input to the receiver, the
signal envelope
in the IF section is a DC level and all detectors produce the same indicated RMS
output.Calibration in terms of RMS is necessary for consistency."

The requirements also state that the 'worst case' emissions need to be captured
over the measurement time interval. AGC is not typically implemented. My
intent in stating the 'peak hold' term of my prior post was to include a
feature which captures and holds in memory the peak emission value. SV appears
to include this function in the 'Memory Mode' as the "Max memory display"
option. I've used this option often and it is great to have.

Regarding the wideband digital modes, the decoding would be done by specialty
decoding algorithms resident on the PC which would be invoked by the user. The
closest example would be the DRM application with VAC. The front-end would need
to accomodate the emission bandwidth which is then piped to the various decoding
algorithms.

By the way, the numeric signal strength panels looks great. My preference is
to keep the 'mechanical meter' also---Looks alot like the one on my Drake R-4a.
From what I've read in the forum from other members, it looks like there is a
wide range of preferences for this item. Seems like this is an area where the
user could select their personal preferences from an options menu.

Let me know if you have questions...
Best regards
Alex





________________________________
From: Simon HB9DRV <simon@>
To: sdr-radio-com@...
Sent: Thu, July 1, 2010 8:57:46 PM
Subject: RE: [sdr-radio-com] Maximum variable filter bandwidth


Hi,

100kHz bandwidth I understand, what's the peak hold - AGC or... ?

For these wide digital modes how would you want the output - via a soundcard?

Simon Brown, HB9DRV
http://sdr-radio. com

From:sdr-radio-com@ yahoogroups. com [mailto:sdr- radio-com@ yahoogroups. com]
On Behalf Of Alex P

It would be desirable to have a 100 KHz variable AM bandwidth with a peak-hold
option which works with the SDR-IQ. Regarding the maximum bandwidth
question, there are digital modes that have bandwidths substantially larger
than 190 KHz to be used above 30 MHz. Currently there is a digital mode on HF
that uses a 25 KHz bandwidth which may be expanded to 75 KHz. Best regards. Alex

Yes, can do this.



Simon Brown, HB9DRV

http://sdr-radio.com



From: sdr-radio-com@... [mailto:sdr-radio-com@...]
On Behalf Of gi8ydz



Hi Simon,

On the dbm meter could we have the updating digits in dbm as opposed to S
values ?

Thanks for the console, works great in Win XP sp2 and Vista, no crashes
since the last patch, very stable.