Date   
Re: USB-relay board accessible in V3 Server?

sm6fhz
 

Hi Simon and all.
Any new information on this question?
It would be fantastic if that was an option to switch between antennas on a remote site!
73 / Ingolf, SM6FHZ

Re: What I would like to see in future versions.

Denny
 

I agree with both comments referring to the passband tuning feature being lacking in most SDR software. Although it can be manually 'simulated' by adjusting the filter bandwidths, it takes time to obtain the same results as a real bandpass feature will provide.

I miss having it also, as it has been a feature many of us have discovered after years of its use in other receivers for decades, find now it is no longer a part-of-the- receiver software design.

Denny - K0LGI -

Re: What I would like to see in future versions.

Guy Atkins
 

Both the Perseus software and Studio 1 allow you to "slide" the passband smoothly across the carrier frequency. This has proven to be the "killer feature" for trans-Pacific & trans-Atlantic DXing on medium wave. When tuning in LSB or USB (or SAM mode with selectable sideband), it can give an extra bit of splatter rejection and intelligibility to these often-weak signals that are just 1 to 5 kHz away from powerful local or regional MW stations. It usually takes just 50-400 Hz of the passband crossing center frequency to improve the DX station without distortion setting in or otherwise degrading the desired signal.

I wish all SDR software allowed this flexibility that's only in Perseus and Studio 1 to my knowledge. SDRUno--a Studio 1 derivative--may offer this too.

Re: What I would like to see in future versions.

Siegfried Jackstien
 

in console i add some more filters ... flipping passbands with click of the mouse

faster as dragging the filter edges

dg9bfc sigi


Am 14.08.2019 um 17:31 schrieb Denny:

I agree with both comments referring to the passband tuning feature being lacking in most SDR software. Although it can be manually 'simulated' by adjusting the filter bandwidths, it takes time to obtain the same results as a real bandpass feature will provide.

I miss having it also, as it has been a feature many of us have discovered after years of its use in other receivers for decades, find now it is no longer a part-of-the- receiver software design.

Denny - K0LGI -

Re: What I would like to see in future versions.

Bjarne Mjelde
 

Totally agree with Guy on this. Countless IDs have been recovered using this feature when the sidebands just couldn't take it.

--
Bjarne Mjelde
arcticdx.blogspot.com
Remote rx: arcticsdr.proxy.kiwisdr.com:8073/

Re: TX of previously recorded IQ Data #pluto

Piotr Swiatkiewicz
 


HxD shows me something interesting in the form of a human-readable XML document
at the beginning of the file. Looks like it contains everything one would
expect. I am not sure which chunk it belongs to. Is it "fmt " chunk starting at offset 0x30,
or there is another chunk just after fmt and if so, where does it actually start?

RF64 file example - hex dump

I can also see another piece of human-readable text at the end of the file, as you suggested, Paul:



It also contains interesting stuff, just a bit more work needed to parse it (assuming the free-text format
of this part does not change).

Peter
Kraków, Poland

Re: Receiving DUV Telemetry (FoxTelem) with SDRC V3.x

Hasan Schiers N0AN
 

One thing I didn't mention in how to turn off both HiPass filters:
Ribbon Bar > Receiver > Narrow FM (click on it and deselect High Pass) it appears to be selected by default and will kill DUV telemetry from AO-85/91/92

So: Two places:

1. Settings > Audio > Equalizer (Uncheck Enable, Uncheck 25Hz HPG) , click OK

2. As above: Ribbon > Receiver > Narrow FM , Deseect HighPass

At this point you should see DUB sub-audible in the FoxTelem Decoder.

I just had to teach myself this again, after moving SDRC to a new computer.

73, N0AN

Re: TX of previously recorded IQ Data #pluto

Paul White <paul@...>
 

Piotr, you've corrected me there: that first chunk you're seeing is "auxi" (and, if memory doesn't fail me, is one of *two* places used by SDRC).
At the end you'll find the "LIST" chunk (of type "INFO") with more stuff.
Be warned that LIST is one of the most misunderstood of all chunk types, a complete MS MESS. Often misnamed "INFO-LIST chunk" and erroneously described as allowing sub-chunks, it actually has far more in common with the top-level FORM structure (c.f. RIFF form of type WAVE).
You'll need to study the LIST-INFO examples found online, plus the SDRC elements currently written.
The "auxi" chunk is not globally registered, was conceived by the author of SpectraVue specifically to store SDR I-Q file metadata, is used in various SDR software from WinRad and Perseus to SDRuno and Elad, has gone through at least three structure versions, but never formally developed to keep up with expanding needs. I'm not going to risk publishing structure details. Again, you'll find stuff online.
 

Adalm Pluto taking too long acquire data in Matlab project #pluto

alexvujic0@...
 

Hi, 
 I tried to sample some data from Rx of my Pluto and log it in data  array in MATLAB. Purpose was to later find signal with biggest magnitude from the spectar i was looking at. It seems like rxPluto() is taking like 8 seconds to finish sampling ( measured with tic toc) .  Can anyone explain me why is this happening and give me some better solution? Thanks

centFrekv=1e9;
BasebandSampRate=1e6;
SpF=1000;
rxPluto = sdrrx('Pluto', 'CenterFrequency',centFrekv,'BasebandSampleRate',BasebandSampRate,'SamplesPerFrame',SpF);
tic
  [data]=rxPluto();   
toc

Re: RTL-SDR Bandwidth verses S/N #rtl

jdow
 

Hint - ALWAYS ALWAYS ALWAYS run your rtlsdr dongle at 2.4 ksps, the highest reliable sample rate supported by the dongles interface chip. This allows you to get some additional decimation steps in SDRC which expand the dynamic range. When this is done in the RTL dongle itself, as for low sample rates, this dynamic range increase in the dongle is trimmed right out by sending only the 8 MSBs of the data.

What you are seeing is related to this.
{^_^}

On 20190814 05:46:59, Paul wrote:
Hi folks - running SDRC on 64 bit Win 10 and have been playing with the SDRC bandwidth of the RTL while copying CW and FT8 and noticed that my noise floor apparently drops when I go from 200 khz to 1 meg BW.  Here is example of copying a local station - first two decodes at 1 meg BW and second at 200 khz BW.  Seems counterintuitive.
Next I was copying two CW beacons, left one is local and right one 60 miles west in the mountains.  First picture is at 200 khz BW and second is 1 meg - secons is some much cleaner with less background noise.
Anyone suggest reason why this is?
Thanks- Paul NO0T
20190809_151748.jpg
20190809_151918.jpg

Re: ARRL/TAPR DCC, Detroit, 9/20-22 (Early Bird Registration Discount Ending)

jdow
 

Detroit - shudder. I escaped. I was married the day the riots started in 1967. The trip from the East side to the airport was in blissful ignorance of what was happening. The following year we were "outa there" headed for a job in California when Detroit rioted briefly over MLKjr's death. I was back once 1972ish. I had a reason to visit the local ham radio store. It had relocated to Troy. The area was er ah "forbidding". White folks were NOT welcome. I have never felt an urge to go back. I wonder what possessed TAPR to hold the convention there.
{o.o}

On 20190814 07:54:08, Mark Thompson via Groups.Io wrote:
*2019 ARRL/TAPR DCC *
*(Digital Communications Conference) *
*
*
*Detroit, MI (near airport) **
*
*September 20 - 22*
****
*/Early Bird Discount Registration Discount /*
/*Ending **on Thursday, August 15th */
//
*DCC Features:*
- Two days of Technical Forums on Friday & Saturday
- Introductory Forums on Saturday
- Saturday Night Banquet with Keynote Speaker & Prize Drawing
- Sunday Morning In-Depth Seminar
- Demo Room with Free Tables Available
https://www.tapr.org/dcc#registration
__

Re: ARRL/TAPR DCC, Detroit, 9/20-22 (Early Bird Registration Discount Ending)

Simon Brown
 

It's close to the airport 😊 .

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

-----Original Message-----
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow

Detroit - shudder. I escaped. I was married the day the riots started in 1967.

The trip from the East side to the airport was in blissful ignorance of what was happening. The following year we were "outa there" headed for a job in California when Detroit rioted briefly over MLKjr's death. I was back once 1972ish. I had a reason to visit the local ham radio store. It had relocated to Troy. The area was er ah "forbidding". White folks were NOT welcome. I have never felt an urge to go back. I wonder what possessed TAPR to hold the convention there.

{o.o}

Re: ARRL/TAPR DCC, Detroit, 9/20-22 (Early Bird Registration Discount Ending)

jdow
 

The one I drove by during a snowstorm and listened to ATC? Yeah, that's the one. A BOAC jet landed and tower asked how was the braking? The pilot replied poor. Another plane and tower exchanged brief messages. BOAC broke in again, "I was going to say, what braking?" Those were the days - about 1964 or so. I had an ARC-1 in the car with a complement of crystals that included Detroit Metro ground. I could also tune it up to 145.350 for ham use.

Close to the airport helps. (And if I went I could visit my son who works for Ford very roughly in that area. He's the family Mechanical Engineering whiz. His tricked out Bronco is - well - often airborne over the dunes in western Mitten.)

Still - not me.
{^_^}

On 20190815 03:00:00, Simon Brown wrote:
It's close to the airport 😊 .
Simon Brown, G4ELI
https://www.sdr-radio.com
-----Original Message-----
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Detroit - shudder. I escaped. I was married the day the riots started in 1967.
The trip from the East side to the airport was in blissful ignorance of what was happening. The following year we were "outa there" headed for a job in California when Detroit rioted briefly over MLKjr's death. I was back once 1972ish. I had a reason to visit the local ham radio store. It had relocated to Troy. The area was er ah "forbidding". White folks were NOT welcome. I have never felt an urge to go back. I wonder what possessed TAPR to hold the convention there.
{o.o}

Re: What I would like to see in future versions.

JAP
 

My request will be to fix "Quick access bar" icons when PC wake up, save the user configuration and more explicit listing of commands.



Kind regards. Jean.

High CPU load on tuning / scrolling

Ernst Siderits (OE3IDE)
 

Hi,

I noticed a high CPU-Load while tuning (with scroll wheel).
* Using 3.0.12
* SDRPlay RSP connected to powered USB-Hub (tried also an USB 3.0 port direct on the PC - no change)
* tried 500Hz and 2000Hz bandwidth
* disabled tracking, to avoid interference with OmniRig
* same behaviour, if I activate tracking and tune via FT-2000
* PC: i5-4460 3,2Ghz, 4 cored, 16gb RAM, Samsung Pro SSD, NVIDIA GeForce 1050 TI 4GB

See video.
Any ideas are welcome :-)

Thanks & 73
Ernst, OE3IDE

Re: High CPU load on tuning / scrolling

Simon Brown
 

Ernst,

 

Without watching the video I can tell you that there will be a high load when scrolling. A lot of data has to be read from the cache, run through FFT, scaled and redrawn, all this in real-time (or close as possible). When this processing happens I enable C++ parallel processing – I use all the cores on the CPU so you get the maximum user experience. Trust me, there’s a lot of work to do, I’m not just scrolling a bitmap.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Ernst Siderits (OE3IDE)
Sent: 15 August 2019 14:47
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] High CPU load on tuning / scrolling

 

Hi,

I noticed a high CPU-Load while tuning (with scroll wheel).
* Using 3.0.12
* SDRPlay RSP connected to powered USB-Hub (tried also an USB 3.0 port direct on the PC - no change)
* tried 500Hz and 2000Hz bandwidth
* disabled tracking, to avoid interference with OmniRig
* same behaviour, if I activate tracking and tune via FT-2000
* PC: i5-4460 3,2Ghz, 4 cored, 16gb RAM, Samsung Pro SSD, NVIDIA GeForce 1050 TI 4GB

See video.
Any ideas are welcome :-)

Thanks & 73
Ernst, OE3IDE

Re: High CPU load on tuning / scrolling

Paul White <paul@...>
 

On Thu, Aug 15, 2019 at 02:46 PM, Ernst Siderits (OE3IDE) wrote:
high CPU-Load
It's only about 10-15% higher than when not scrolling.

Re: ARRL/TAPR DCC, Detroit, 9/20-22 (Early Bird Registration Discount Ending)

Barry Baines
 

“JDOW”:  

On Aug 15, 2019, at 1:23 AM, jdow <jdow@...> wrote:

Detroit - shudder. I escaped. I was married the day the riots started in 1967. The trip from the East side to the airport was in blissful ignorance of what was happening. The following year we were "outa there" headed for a job in California when Detroit rioted briefly over MLKjr's death. I was back once 1972ish. I had a reason to visit the local ham radio store. It had relocated to Troy. The area was er ah "forbidding". White folks were NOT welcome. I have never felt an urge to go back. I wonder what possessed TAPR to hold the convention there.
{o.o}

Well, given that your experience was over 45 years ago, I suppose it is possible that conditions have changed somewhat in Detroit. And given that you were not aware of the riots taking place in downtown Detroit and not at the airport where you were headed makes it clear that these riots were not taking place where this year’s ARRL/TAPR DCC is taking place.  I don’t know why TAPR is specifically meeting in Detroit, but my guess is that their conferences rotate around the country in an attempt to attract regional attendees and they were able to secure a venue that was reasonably priced, had good transportation access, and could support their conference requirements.  The 2018 DCC took place in Albuquerque, NM.

As the conference is near the airport, presumably their conference hotel (Detroit Metro Airport Marriott Hotel in Romulus, MI) has an airport shuttle service.  No need for attendees to be ’set loose’ on the environs of Detroit itself if they don’t want to rent a car or visit local attractions.  

As I recall, AMSAT held a Space Symposium in Detroit in 1989  (17 years after your last visit to the area), and last I heard the attendees departed that Symposium ‘intact’.  Since the 1980s either AMSAT or TAPR have held conferences/symposiums in cities that had riots in 1960s  (Washington, Baltimore, Chicago, Hartford, St. Louis, and Atlanta to name a few).  Due to logistics/transportation considerations these events typically take place near airports to make it easier for attendees to reach the conference venue.  This year’s AMSAT Space Symposium (celebrating the organization’s 50th Anniversary) is taking place in Alexandria, VA the weekend of 18-20 OCT which is easily accessible using the Metro from Reagan Airport or Union Station (for those coming into Washington by Rail) or hailing a taxi/Uber/Lyft.  See:  https://www.amsat.org/amsat-symposium/.  AMSAT is holding their 50th Anniversary celebration in the DC area because AMSAT was founded in Washington, DC in March 1969.

It is certainly important to remember history in terms of the who/what/when/why/where events and decisions took place.  However, human history is not static and conditions, people, cities, politics etc. change over time.  What was experienced so many years ago in a specific area will not represent current conditions (for better or for worse).  I’m sure that this year’s  ARRL/TAPR DCC and the AMSAT Space Symposium will enjoy great success given the time/effort put into them by the volunteers/presenters/organizational leadership that make these events possible as well as the attendees ‘voting with their feet’ to make the trip and participate in these conferences.  



FWIW,

Barry Baines, WD4ASW
Keller, TX





On 20190814 07:54:08, Mark Thompson via Groups.Io wrote:
*2019 ARRL/TAPR DCC *
*(Digital Communications Conference) *
*
*
*Detroit, MI (near airport) **
*
*September 20 - 22*
****
*/Early Bird Discount Registration Discount /*
/*Ending **on Thursday, August 15th */
//
*DCC Features:*
- Two days of Technical Forums on Friday & Saturday
- Introductory Forums on Saturday
- Saturday Night Banquet with Keynote Speaker & Prize Drawing
- Sunday Morning In-Depth Seminar
- Demo Room with Free Tables Available
https://www.tapr.org/dcc#registration
__




Re: TX of previously recorded IQ Data #pluto

Piotr Swiatkiewicz
 

Paul,

yeah, exactly - I sensed that "auxi" string was not an accident. I vaguely recall reading about it a long time ago.
Now I tried searching for it online, but could not find any useful info. I shall keep looking, I guess.
Like the idea of embedding the XML description of the recording. That should be relatively easy to parse.

Thanks!
--
Peter
Kraków, Poland

external radio question

wa1vta01452
 

I just loaded SDR Console on a new (win 10) pc. I am attached to an ic-7300 via CiV. Could someone tell me how to display the external radio block  at the left side of the screen? I use an earlier V3 version on a Win 7 pc which does have the external radio option visible.  Omnirig client indicates I am communicating with the radio.