Date   

how to run airspy_adsb?

yingwenwei@...
 

I have used my airspy in my raspberry, and typed the commands 
# sudo ./airspy_adsb -l 30005:beast -l 47806:asavr -c sdrsharp.com:47806:avr -p -n -w 4 &

However, the only reply is
[2] 1322
what's wrong?

any reply will be appreciated!


DDE Tracking Client Changes Mode to NFM #sdrsharp

John Kludt K7SYS
 

Up until last week my system worked fine (Win10, SDR# AirSpy).  Now when I use the DDE Tracking client it forces the Airspy to NFM and I cannot change the mode.  IF I clinck another mode button it immediately returns to NFM.  If I turn DDE tracking off, all works normally.  The source of data SATpc32 does not even have NFM as a mode.

John


Re: BCFM filter

jdow
 

On 2017-09-16 08:45, David J Taylor via Groups.Io wrote:
Hello friends:
Thank's again for ALL your posts.
I'm learning a lot with this thread.
Today i have received the BCFM Notch filter and it is doing a GREAT Job.
Finally i bought RTL-SDR BCFM Filter.
One more question:
Where is the best place to install this filter?
My setup now is:
Antenna --> BCFM Filter --> LNA4ALL --> Coax --> Airspy R2
This evening i will test with NOAA's and Meteor M2.
Thank's again.
===========================================
Someone asked about the response of that filter so, at great expense (!), I bought and measured one:
 http://www.satsignal.eu/Radio/ddamtek-filters.html#RTL-SDR
It works as advertised, but I am not convinced about my own measurements of ripple in the passband.
73,
David GM8ARV
Thanks for the measurements. And I am not particularly surprised at the relatively slight passband ripple on the BCFM filter. At one time it was impossible to assemble an RG223U bulkhead type N filter that looked that good over that frequency range, particularly in the GPS frequency range. I hear that design defect has been corrected since 1976 or so.

{^_^}


Re: BCFM filter

doug
 

On 09/16/2017 10:45 AM, David J Taylor via Groups.Io wrote:
Hello friends:

Thank's again for ALL your posts.
I'm learning a lot with this thread.
Today i have received the BCFM Notch filter and it is doing a GREAT Job.
Finally i bought RTL-SDR BCFM Filter.

One more question:
Where is the best place to install this filter?
My setup now is:
Antenna --> BCFM Filter --> LNA4ALL --> Coax --> Airspy R2

This evening i will test with NOAA's and Meteor M2.

Thank's again.
===========================================

Someone asked about the response of that filter so, at great expense (!), I bought and measured one:

http://www.satsignal.eu/Radio/ddamtek-filters.html#RTL-SDR

It works as advertised, but I am not convinced about my own measurements of ripple in the passband.

73,
David GM8ARV
It is traditional to put any filter AFTER a preamp, so as not to increase the noise figure of the system. If you put the filter ahead of the preamp, its insertion loss will increase the
system noise figure by the amount of the insertion loss. HOWEVER, if there is any overload of the preamp, then you will have to put the filter ahead of the preamp in the
chain of system components. If you have good signals in the band which you wish to listen to, then putting the preamp after the filter will not be noticeable to your reception.

--doug, WA2SAY, retired RF engineer.


Re: BCFM filter (was: Re: [airspy] Best Gain Settings for 137 mhz reception}

Ruben Navarro Huedo (EA5BZ)
 

I understand :)

Thank's a lot


Re: BCFM filter (was: Re: [airspy] Best Gain Settings for 137 mhz reception}

David J Taylor
 

From: Ruben Navarro Huedo (EA5BZ)

Thank's for the test David.

What means " ripple in the passband " ?
=============================================

Ruben,

I mean that there appear to be small variation in the passband - usually less than 1 dB - which might be likened to ripples on water. I am not convinced that my test is correct.

73,
David GM8ARV
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-taylor@blueyonder.co.uk
Twitter: @gm8arv


.


Re: BCFM filter (was: Re: [airspy] Best Gain Settings for 137 mhz reception}

Ruben Navarro Huedo (EA5BZ)
 

Thank's for the test David.

What means " ripple in the passband " ?


BCFM filter (was: Re: [airspy] Best Gain Settings for 137 mhz reception}

David J Taylor
 

Hello friends:

Thank's again for ALL your posts.
I'm learning a lot with this thread.
Today i have received the BCFM Notch filter and it is doing a GREAT Job.
Finally i bought RTL-SDR BCFM Filter.

One more question:
Where is the best place to install this filter?
My setup now is:
Antenna --> BCFM Filter --> LNA4ALL --> Coax --> Airspy R2

This evening i will test with NOAA's and Meteor M2.

Thank's again.
===========================================

Someone asked about the response of that filter so, at great expense (!), I bought and measured one:

http://www.satsignal.eu/Radio/ddamtek-filters.html#RTL-SDR

It works as advertised, but I am not convinced about my own measurements of ripple in the passband.

73,
David GM8ARV
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-taylor@blueyonder.co.uk
Twitter: @gm8arv


.


Re: ARRL review of the SDRPlay RSP2

W0LEV
 

Dewy and all:  I have to agree totally with you.  However, in working with the physics department at Berthoud HS and the STEM students there, I find the kids of today don't know how to dig for needed information nor know how to do research nor are even able to use or are aware of the scientific method.  What's more, they no longer read.  If it ain't (forgive me) on the Internet, it don't (forgive me) exist.  Yes, you rightfully could argue that what we learned from TEXTbooks is in front of them on the Internet.  However, they don't know how to sort the snake oil from real physics (or chemistry, or literature, or biology, or......).   Experience with the STEM students last year (radio astronomy) the mentors (of which I was one) assumed since they had had calculus, we could use at least differential calculus in our 'mentoring'.  That was a huge mistake on our part.  Even though they had had the course work and passed with good grades, they couldn't use the assumed knowledge.  When it comes to coding for a purpose (statistical filtering of data), even though they had had the course work in the proper languages and passed the course work with a good grade, they could not apply the assumed knowledge.

Just one more example and I'll quit.  We have formed a ham club at the HS, WØBHS (for Berthoud High School), to try and give the participants a leg up on the upper level physics classes, especially in electromagnetism.  This past Wednesday, we were designing directional antennas (at a very basic level).  Of course, one group, mine, chose a Yagi.  OK....., what are the four 'objects' that must go into any Yagi design (boom, Driven Element, Reflector, and Director).  They had supposedly spent the previous week doing research on how to design their chosen antenna type.  OK....no answer.  After a minute or so, one of the members of the group found a diagram on his IPhone from the Internet.  He immediately read off the correct four answers to my questiion.  We went on in the discussion of Yagi antennas for a short time.  FIVE, yes F I V E, minutes later, I posed the identical question.  NO ANSWERS.  Not much for attention span........

This is so typical of today's youth.  And Berthoud HS is one of the outstanding HSs in the state of Colorado in the hard sciences and math (as is their physics instructor). 

I won't belabor the point further, but I pulled out of STEM mentorship half way through this year due to frustration.  The kids learn a whole bunch of unconnected facts, but can't put them together to use the assumed knowledge.  I don't know if I will do STEM next year or not.  However, I will continue to volunteer in the Physics classes as needed and continue to volunteer in radio astronomy at the Little Thompson Observatory, <starkids.org>.

My goal in retirement is to promote the hard sciences and math to the HS bunch. 

Respectively Submitted:

Dave Eckhardt - WØLEV

On Fri, Sep 15, 2017 at 12:56 PM, Dewey <Dewey3@...> wrote:
Who says the issue at hand is the ARRL???  IIRC, the thread started because of the ARRL's refusal to basically get on board.  If they, the ARRL want to remain in the ways of last century, then that is the bad they made and will sleep in.  I agree that the Wiki here is an excellent place.  At least those who desire to be on board can very easily find this through their own due diligence, and they don't even have to pay for outdated and/or inaccurate information!  Yea, the Wiki here is a great place.

Dewey

-----Original Message-----
From: main@airspy.groups.io [mailto:main@airspy.groups.io] On Behalf Of Joe M.
Sent: Friday, September 15, 2017 12:51
To: main@airspy.groups.io
Subject: Re: [airspy] ARRL review of the SDRPlay RSP2

While the WIKI is great, the issue at
hand is education of ARRL and its members.

The ARRL needs to be dragged into the 21st century - kicking and screaming if necessary.

Joe M.

On 9/15/2017 12:37 PM, David J Taylor via Groups.Io wrote:
> SDR could take a series of articles. (or an entire QST)
>
> Joe M.
> ==============================
>
> We have a Wiki where articles could be developed.  It would be helpful
> to have a wider potential circulation than just QST subscribers.
>
>   http://sdrsharp.pbworks.com
>
> 73,
> David GM8ARV









--
Dave - WØLEV
Just Let Darwin Work


Re: ARRL review of the SDRPlay RSP2

Joe M.
 

The thread started as a result of a (poorly conducted) review by the ARRL. Look at the subject line. It migrated on to a discussion about how much better the experts on the list could do, and the suggestion they write articles that would educate the ARRL and its members on how SDR is not "your grandfather's receiver", proper testing techniques, and overall design.

Joe M.

On 9/15/2017 2:56 PM, Dewey wrote:
Who says the issue at hand is the ARRL??? IIRC, the thread started because of the ARRL's refusal to basically get on board. If they, the ARRL want to remain in the ways of last century, then that is the bad they made and will sleep in. I agree that the Wiki here is an excellent place. At least those who desire to be on board can very easily find this through their own due diligence, and they don't even have to pay for outdated and/or inaccurate information! Yea, the Wiki here is a great place.

Dewey

-----Original Message-----
From: main@airspy.groups.io [mailto:main@airspy.groups.io] On Behalf Of Joe M.
Sent: Friday, September 15, 2017 12:51
To: main@airspy.groups.io
Subject: Re: [airspy] ARRL review of the SDRPlay RSP2

While the WIKI is great, the issue at
hand is education of ARRL and its members.

The ARRL needs to be dragged into the 21st century - kicking and screaming if necessary.

Joe M.

On 9/15/2017 12:37 PM, David J Taylor via Groups.Io wrote:
SDR could take a series of articles. (or an entire QST)

Joe M.
==============================

We have a Wiki where articles could be developed. It would be helpful
to have a wider potential circulation than just QST subscribers.

http://sdrsharp.pbworks.com

73,
David GM8ARV





---
This email has been checked for viruses by AVG.
http://www.avg.com


Re: ARRL review of the SDRPlay RSP2

Dewey
 

Who says the issue at hand is the ARRL??? IIRC, the thread started because of the ARRL's refusal to basically get on board. If they, the ARRL want to remain in the ways of last century, then that is the bad they made and will sleep in. I agree that the Wiki here is an excellent place. At least those who desire to be on board can very easily find this through their own due diligence, and they don't even have to pay for outdated and/or inaccurate information! Yea, the Wiki here is a great place.

Dewey

-----Original Message-----
From: main@airspy.groups.io [mailto:main@airspy.groups.io] On Behalf Of Joe M.
Sent: Friday, September 15, 2017 12:51
To: main@airspy.groups.io
Subject: Re: [airspy] ARRL review of the SDRPlay RSP2

While the WIKI is great, the issue at
hand is education of ARRL and its members.

The ARRL needs to be dragged into the 21st century - kicking and screaming if necessary.

Joe M.

On 9/15/2017 12:37 PM, David J Taylor via Groups.Io wrote:
SDR could take a series of articles. (or an entire QST)

Joe M.
==============================

We have a Wiki where articles could be developed. It would be helpful
to have a wider potential circulation than just QST subscribers.

http://sdrsharp.pbworks.com

73,
David GM8ARV


Re: ARRL review of the SDRPlay RSP2

Bob Thornburg <wolfbob@...>
 

Strange what typing in "qex sdr" in your search engine will get:

Bob WB6JPI

----- Original Message -----
From: "David J Taylor via Groups.Io" <gm8arv=yahoo.co.uk@groups.io>
To: <main@airspy.groups.io>
Sent: Friday, September 15, 2017 9:37 AM
Subject: Re: [airspy] ARRL review of the SDRPlay RSP2


SDR could take a series of articles. (or an entire QST)

Joe M.
==============================

We have a Wiki where articles could be developed. It would be helpful to have a wider potential circulation than just QST subscribers.

http://sdrsharp.pbworks.com

73,
David GM8ARV
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-taylor@blueyonder.co.uk
Twitter: @gm8arv

.


Re: ARRL review of the SDRPlay RSP2

Joe M.
 

While the WIKI is great, the issue at
hand is education of ARRL and its members.

The ARRL needs to be dragged into the 21st
century - kicking and screaming if necessary.

Joe M.

On 9/15/2017 12:37 PM, David J Taylor via Groups.Io wrote:
SDR could take a series of articles. (or an entire QST)

Joe M.
==============================

We have a Wiki where articles could be developed. It would be helpful
to have a wider potential circulation than just QST subscribers.

http://sdrsharp.pbworks.com

73,
David GM8ARV


Re: ARRL review of the SDRPlay RSP2

David J Taylor
 

SDR could take a series of articles. (or an entire QST)

Joe M.
==============================

We have a Wiki where articles could be developed. It would be helpful to have a wider potential circulation than just QST subscribers.

http://sdrsharp.pbworks.com

73,
David GM8ARV
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-taylor@blueyonder.co.uk
Twitter: @gm8arv


.


Re: ARRL review of the SDRPlay RSP2

Joe M.
 

SDR could take a series of articles. (or an entire QST)

Joe M.

On 9/14/2017 6:44 PM, doug wrote:

Joanne, it is quite obvious that you have more experience with SDRadio
than the folks at ARRL, but before condemning them, might it not be
worth while to write a NICE letter, or even better,

an article, explaining SDR in relatively simple (but not simplistic)
terms? I am not competent to do so, since I am not all that familiar
with SDR myself. I think it would get a fair hearing at Newington,

and probably get you into QST. And you would be doing a service to all
amateurs, including me!

--doug, WA2SAY


On 09/14/2017 02:31 PM, jdow wrote:
And what set me off from the test results page.
===8<---
FM two-tone third-order dynamic range: Not specified
20 kHz spacing: 29 MHz, 50 dB†; 52 MHz 49 dB†, 144 MHz, 50 dB; 440
MHz,
40 dB†. 10 MHz spacing: 29 MHz, 61 dB, 52 MHz, 64 dB; 144MHz, 57
dB;
440 MHz, 59 dB.
Measured with maximum RF gain setting.
===8<---
Note that last line. The damn fool reviewer had no idea how to use an
SDR properly.

{+_+}



On 2017-09-14 11:06, John Scherer wrote:
Ya, like the "Bottom Line" call out on the first page?

"Building on the success of theRSP1, the SDRplay RSP2 adds a number
of useful features"

On Thu, Sep 14, 2017 at 1:34 AM, Shirley Dulcey KE1L
<mark@buttery.org <mailto:mark@buttery.org>> wrote:

I have to dissent from the opinions here. Although the ARRL
review is
not perfect, there is a lot of useful information there. In
particular, the lab tests show the excellent sensitivity of the
Airspy, as well as its dynamic range limitations (which are in line
with expectations for a device with a 12 bit digitizer, which other
comments have correctly pointed out was not mentioned in the
review).
They also provide a useful table of the differences between the
R1 and
R2.


On Wed, Sep 13, 2017 at 8:00 PM, <wageners@gmail.com
<mailto:wageners@gmail.com>> wrote:
> Here you go:
>
>
http://www.sdrplay.com/wp-content/uploads/2017/09/QSTRSP2review.pdf
<http://www.sdrplay.com/wp-content/uploads/2017/09/QSTRSP2review.pdf>
>
>
> Stefan
>






--
*John Scherer*
(619)354-4142
1552 Regulus Street 92111
WebsiteGB <https://www.qrz.com/db/N0CTL> email
<mailto:jrsphoto@gmail.com> Twitter button
<https://twitter.com/johnscherer> Google button
<https://plus.google.com/+JohnScherer/posts>






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Re: Beacon tracking of Cute-1 (CO-55) and Cute 1.7+APD 2 (CO-65)

Terry Gaff
 

You're welcome Anand.
A signal from a LEO satellite will constantly change frequency... as it is moving relative to your position. So, as it comes towards you, rising above the horizon, CUTE-1 (CO-55), whose CW frequency is 436.8375 MHz will be received higher than this at around 436.8475 MHz (approx). As it approaches you and climbs higher in the sky, the frequency will get lower. As it passes adjacent to you (at it's nearest point to you) the frequency will be 436.8375 MHz. As it continues it's path away from you, falling in the sky, the frequency will continue to get lower until about 436.8275 MHz when it disappears beyond the horizon.
This means that if you set the frequency in SDR#, and leave the settings alone for the pass, the signal will be seen to sweep from right to left. A noise signal will not normally move like this, it will stay on the waterfall as a perfectly vertical line.
Terry


Re: Beacon tracking of Cute-1 (CO-55) and Cute 1.7+APD 2 (CO-65)

Anand Durai Thirumalai <athi501@...>
 

Hi Terry,

Thank you...I will check with these softwares and try to receive and decode beacons.

Hi Roberto,

Yes, I did get a continuous signal in a waterfall model, but I was not able to decode it and confirm whether its a beacon or a noise signal

Please find the below screenshot,


Thanks,
Anand Durai


Re: Beacon tracking of Cute-1 (CO-55) and Cute 1.7+APD 2 (CO-65)

Terry Gaff
 
Edited

Anand,

Firstly, make sure the elements (TLEs) for the satellites are up to date and Nova is displaying them correctly. A better and more modern software is WxTrack... www.satsignal.eu . You can cross check the software is displaying correctly by using www.n2yo.com.

Here are some sites where you can check the recent status of your two satellites:
http://www.pe0sat.vgnet.nl/satellite/frequencies/
http://www.dk3wn.info/p/?page_id=29535
http://www.asahi-net.or.jp/~ei7m-wkt/satslisj.htm

To decode the CW signal using software, you will need to constantly correct the receive frequency of the signal. For this there is the excellent FastWxTrack, (also from http://www.satsignal.eu/software/beta.htm ). This will constantly correct the receive frequency at 20 times a second via a plugin for SDR#... ( http://www.satsignal.eu/software/DDETracker.html ) . FastWxTrack gets the satellite position info from the TLE files that WxTrack requires.

Regarding receiving a CW signal, I find the best mode for decoding is USB, tune approximately 1KHz lower than the published frequency so the tone itself can be heard around 1KHz. You can enter and adjust 'on the fly' the required receive frequency within FastWxTrack.

I hope this helps a little.

Terry


Re: Beacon tracking of Cute-1 (CO-55) and Cute 1.7+APD 2 (CO-65)

Roberto Zinelli
 

Anand,  you see any signal in waterfall near the frequency tuned? Should be drifting and not on the exact frequency due to doppler.
73 IW4ENS
Roberto

Inviato da OldPhone

Il giorno 15 set 2017, alle ore 08:31, Anand Durai Thirumalai <athi501@...> ha scritto:

Hi All,

I am trying to track CO-55 (436.838MHz) and CO-65 (437.275MHz) amateur satellite's beacon signals which are in CW mode using a Airspy R2 receiver with a 7-8 dB gain yagi antenna.
The position of the satellite is determined using the Nova for windows software and for receiver I use SDR# or sometimes SDR-radio. I only get noise even when the satellite is above my horizon.

Could anyone please advice me with settings required on the SDR# or SDR-radio softwares, so that I can receive the beacon signals?

Thanks in advance,

Anand Durai


Beacon tracking of Cute-1 (CO-55) and Cute 1.7+APD 2 (CO-65)

Anand Durai Thirumalai <athi501@...>
 

Hi All,

I am trying to track CO-55 (436.838MHz) and CO-65 (437.275MHz) amateur satellite's beacon signals which are in CW mode using a Airspy R2 receiver with a 7-8 dB gain yagi antenna.
The position of the satellite is determined using the Nova for windows software and for receiver I use SDR# or sometimes SDR-radio. I only get noise even when the satellite is above my horizon.

Could anyone please advice me with settings required on the SDR# or SDR-radio softwares, so that I can receive the beacon signals?

Thanks in advance,

Anand Durai

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