Date   

Re: Online - London SpyServer

Blogger <blogger@...>
 

Hello John,


That's the one. 

Many thanks for all the other suggestions as well.

There is a 2s delay between the spyserver and the internet output.

https://tunein.com/radio/Spectrum-558am-s10088/?utm_source=tiEmbed&utm_medium=referral&utm_content=s10088


Tuesday, January 16, 2018, 1:39:16 PM, you wrote:


> Spectrum apparently has Arabic programming as well, which a bit more

> realistic from London.


> On Jan 16, 2018 16:36, "John Patterson" <hakuro.jp@...> wrote:


>> A simple search reveals SBC Al-Quran al-Karim transmits on this frequency

>> from Saudi Arabia, that was about the only Arabic language station that I

>> could see on that frequency, but you can see them all online.


>> On Jan 16, 2018 16:26, <blogger@...> wrote:


>>> Indeed.

>>> Then Anyone knows what is the station on 558kHz?

>>> One hour Arabic music then one hour Arabic talk.

>>> Thanks








Best regards,



Re: >> ( Want your radio to be listed here? Contact us.) #spyserver

Tilman D Thulesius <sm0jzt@...>
 

Hi there

Yes this radio is permanent. I have a dedicated server running it. I might have multiple HF+ running of it in the future. This to open up multiple segments.
I might also swap for a better antenna to cater for the multi-HF+ radio:s

Im struggling a bit with understanding the different settings in the config-file. 

If i set the start frequency to 7.1 MHz and remove client control   ( =0), having multiple user access . Does that mean I have a band limitation to 40 meters ??
What happens if I give control ?? Does that mean the first user can move the segment for the users coming in at the same time ??

/ Tilman


Re: Just what is a "Polyphase harmonic rejection mixer "

jdow
 

Use this URL http://icd.ewi.utwente.nl/publications/get_file.php?pub_id=563

The site creates a temporary copy of the file for viewing. It goes away when you disconnect. So you have to use the real URL to get there.

{^_^}

On 2018-01-16 09:00, doug wrote:
On 01/16/2018 07:29 AM, prog wrote:
On Sun, Jan 14, 2018 at 10:41 pm, drew231955 wrote:

The main break through with the HF+ is the Polyphase harmonic rejection
mixer. As best I can work out, when converting to base-band, it is an
effective filter for the desired signal and rejects even strong signals
close by with virtually no filtering ahead of the mixer.

It uses multiple phases of the local oscillator to use phasing to reject
its harmonics, but at the same time, and because it is to a 200 kHz
base-band, it rejects everything else too.

The big advantage is not needing a large number of band pass filters like
a direct sampling SDR; the IC-7300 has 15!

The best explanation I have found is a slide show;
http://icd.ewi.utwente.nl/temp_files/158b39412cff88a4181bfec0f4449c24.pdf.
It is also subject to patent;
https://www.google.ch/patents/US20110298521?hl=de. One of the authors
wrote the slide show.
There is something wrong with this url. I think it's the second / What should the character be?
--doug


Presumably the mixer is a CMOS device, but I have not found one. And the
RF cover on the HF+ is too hard to remove!

Any thoughts on this very novel approach?

Regards Drew VK4ZXI

You can see it as a "super Tayloe mixer". The problem with the original Tayloe Mixer is the harmonic responses at multiples of the LO frequency. The fix is to mathematically suppress these responses by adding more phases. The LO will no longer look like a square wave, but rather like a quantized sine wave. Basically, the more phases you add, the more harmonics you cancel.
This method is combined with narrow band filtering at the mixer itself. There is a switched-capacitor N-Path filter built into the mixer that is tuned using the same LO phases, which provides additional selectivity.
When you see it, all the ingredients required to implement this architecture can be implemented using CMOS silicon, and have a very good "horizontal" and "vertical" scalability: Horizontal with more phases (hence, less harmonics); Vertical with better fab processes (better linearity and NF).

The icing on the cake: This same technology can also work for TX.

The future looks bright!


Re: squelch debate

Buford T. Justice <BTJustice@...>
 

Not what I meant.  I meant having a squelch based solely on SNR.  You have SDR# on and go to a frequency that has no activity.  The noise floor may be -82.5dBFS and the SNR might be 3.5dB.  A signal above that (or whatever the listener chooses) should unmute the squelch.  The squelch should be based on what dB signal level the listener wants to hear.

I just wish LSB and USB had squelch.  The suggested use of "IF Noise Reduction" can effect stuff a listener wants to hear.

BTJustice


Subject: Re: [airspy] squelch debate
Sent: Tue. 1/16/2018 3:12:18 PM CST -0600
From: doug <dmcgarrett@...>
To: main <main@airspy.groups.io>
You should be able to dig out a CW signal less than 7.6 dB above the average noise level, by ear, so you would want the squelch to be either adjustable or switchable.  (BTW, a tangential signal is 8 dB

above the noise, not 7.6, if that's what you had in mind.)

--doug, WA2SAY.


Re: Online - London SpyServer

Marco Melandri
 

On Tue, Jan 16, 2018 at 01:49 pm, prog wrote:
On Tue, Jan 16, 2018 at 01:36 pm, prog wrote:
http://www.spectrumradio.net/programmes/arabicspectrum
Sounds best with these settings:

Same LondonHF server, another station, in DRM mode.
The performance of your SpyServer is simply great as well as G7KUF's setup.
https://youtu.be/VCs0pCzwOxs


Re: Online - London SpyServer

prog
 

On Tue, Jan 16, 2018 at 01:36 pm, prog wrote:
http://www.spectrumradio.net/programmes/arabicspectrum
Sounds best with these settings:


Re: Online - London SpyServer

John Patterson
 

A simple search reveals SBC Al-Quran al-Karim transmits on this frequency from Saudi Arabia, that was about the only Arabic language station that I could see on that frequency, but you can see them all online.

On Jan 16, 2018 16:26, <blogger@...> wrote:
Indeed.
Then Anyone knows what is the station on 558kHz?
One hour Arabic music then one hour Arabic talk.
Thanks


Re: Online - London SpyServer

John Patterson
 

Spectrum apparently has Arabic programming as well, which a bit more realistic from London.

On Jan 16, 2018 16:36, "John Patterson" <hakuro.jp@...> wrote:
A simple search reveals SBC Al-Quran al-Karim transmits on this frequency from Saudi Arabia, that was about the only Arabic language station that I could see on that frequency, but you can see them all online.

On Jan 16, 2018 16:26, <blogger@...> wrote:
Indeed.
Then Anyone knows what is the station on 558kHz?
One hour Arabic music then one hour Arabic talk.
Thanks


Re: Online - London SpyServer

Alan G4ZFQ
 

Then Anyone knows what is the station on 558kHz?
One hour Arabic music then one hour Arabic talk.
558 R.Iran 0000 ON 2400 Persian Iran Iran smtwtfs IRIB 1000 (KW?)

?

73 Alan G4ZFQ


Re: Online - London SpyServer

prog
 

On Tue, Jan 16, 2018 at 01:26 pm, <blogger@...> wrote:
Indeed.
Then Anyone knows what is the station on 558kHz?
One hour Arabic music then one hour Arabic talk.
Thanks
http://www.spectrumradio.net/programmes/arabicspectrum


Re: Online - London SpyServer

PMM
 

Radioman.eu/uk/play/spectrum

On 16 Jan 2018 21:26, <blogger@...> wrote:
Indeed.
Then Anyone knows what is the station on 558kHz?
One hour Arabic music then one hour Arabic talk.
Thanks


Re: Online - London SpyServer

blogger@...
 

Indeed.
Then Anyone knows what is the station on 558kHz?
One hour Arabic music then one hour Arabic talk.
Thanks


Re: squelch debate

doug
 


On 01/16/2018 02:18 PM, Buford T. Justice wrote:
I forgot to say that this would be regardless of the dBFS noise floor.  So a signal would have to be (using my example below) 7.6 dB or higher to unmute.  That would be a pretty awesome feature :)

You should be able to dig out a CW signal less than 7.6 dB above the average noise level, by ear, so you would want the squelch to be either adjustable or switchable.  (BTW, a tangential signal is 8 dB

above the noise, not 7.6, if that's what you had in mind.)

--doug, WA2SAY.

Subject: Re: [airspy] squelch debate
Sent: Sun. 1/14/2018 5:00:30 PM CST -0600
From: Buford T. Justice <BTJustice@...>
To: main <main@airspy.groups.io>
If SDR# does get squelch, hopefully it would be a new idea like having it based on the SNR reading.  Anything below a user-set SNR reading is completely audio muted.  Say I set my SDR# SNR Squelch to 7.5 dB then any noise/signal at 7.5 dB and below would be muted.

BTJustice


Re: Online - London SpyServer

Simon Brown
 

Hi,

 

560kHz is not a value European MW frequency, 558 kHz and 567 kHz are as our frequencies are multiples of 9 kKz unlike NA where it’s a multiple of 10 kHz.

 

Simon Brown, G4ELI

 

www.dxgalaxy.com
www.sdr-radio.com
www.sdr-satellites.com

 

 

From: main@airspy.groups.io [mailto:main@airspy.groups.io] On Behalf Of blogger@...
Sent: 16 January 2018 19:47
To: main@airspy.groups.io
Subject: Re: [airspy] Online - London SpyServer

 

The londonhf.ddns.net is great!
Anyone knows what is this station on 560kHz?


Re: Online - London SpyServer

blogger@...
 

The londonhf.ddns.net is great!
Anyone knows what is this station on 560kHz?


Re: squelch debate

Buford T. Justice <BTJustice@...>
 

I forgot to say that this would be regardless of the dBFS noise floor.  So a signal would have to be (using my example below) 7.6 dB or higher to unmute.  That would be a pretty awesome feature :)


Subject: Re: [airspy] squelch debate
Sent: Sun. 1/14/2018 5:00:30 PM CST -0600
From: Buford T. Justice <BTJustice@...>
To: main <main@airspy.groups.io>
If SDR# does get squelch, hopefully it would be a new idea like having it based on the SNR reading.  Anything below a user-set SNR reading is completely audio muted.  Say I set my SDR# SNR Squelch to 7.5 dB then any noise/signal at 7.5 dB and below would be muted.

BTJustice


Re: >> ( Want your radio to be listed here? Contact us.) #spyserver

Sergey Abramov <sergey.rw3ps@...>
 

Thanks, 
I play and experiment :)
It is possible to listen to

1-8 MHz antenna Inverter V 80/40m
200 кm South of Moscow,
the number of clients is limited and I can briefly disable the receiver for personal experiments.

73! Sergey RW3PS

2018-01-16 21:10 GMT+03:00 prog <info@...>:

On Tue, Jan 16, 2018 at 08:14 am, Sergey Abramov wrote:
Another question, how does it work:
 
# Allow clients to control the device
#
allow_control = 1
 
What functionality is available to control users? Full IQ, what else?
If there are 10 clients, all will be available control?
 
 Аll users can not tune the device anywhere within the specified min/max frequency limits for example, 80m and 40m HAM bands?
Sorry for many questions.
Control includes the device's center frequency and gain stages if there are gain stages.
When there's more than 1 client connected, the control is disabled for all.
Yes, you can specify the min/max frequency. Don't be afraid to play and experiment. It will take you much less time.



Re: Just what is a "Polyphase harmonic rejection mixer "

David Eckhardt
 

Simply put, the old phasing method of SSB generation is somewhat similar.  It was capable of nulling the carrier (the LO, so to speak) and nulling one of the sidebands (the image).  It required a quadrature LO source.  But the mixer technology referred to takes that to a whole different level.

If I'm in error, someone please correct.

Dave - WØLEV

On Tue, Jan 16, 2018 at 12:29 PM, prog <info@...> wrote:
On Sun, Jan 14, 2018 at 10:41 pm, drew231955 wrote:
The main break through with the HF+ is the Polyphase harmonic rejection mixer. As best I can work out, when converting to base-band, it is an effective filter for the desired signal and rejects even strong signals close by with virtually no filtering ahead of the mixer.

It uses multiple phases of the local oscillator to use phasing to reject its harmonics, but at the same time, and because it is to a 200 kHz base-band, it rejects everything else too.

The big advantage is not needing a large number of band pass filters like a direct sampling SDR; the IC-7300 has 15!

The best explanation I have found is a slide show; http://icd.ewi.utwente.nl/temp_files/158b39412cff88a4181bfec0f4449c24.pdf. It is also subject to patent; https://www.google.ch/patents/US20110298521?hl=de. One of the authors wrote the slide show.

Presumably the mixer is a CMOS device, but I have not found one. And the RF cover on the HF+ is too hard to remove!

Any thoughts on this very novel approach?

Regards Drew VK4ZXI
You can see it as a "super Tayloe mixer". The problem with the original Tayloe Mixer is the harmonic responses at multiples of the LO frequency. The fix is to mathematically suppress these responses by adding more phases. The LO will no longer look like a square wave, but rather like a quantized sine wave. Basically, the more phases you add, the more harmonics you cancel.
This method is combined with narrow band filtering at the mixer itself. There is a switched-capacitor N-Path filter built into the mixer that is tuned using the same LO phases, which provides additional selectivity.
When you see it, all the ingredients required to implement this architecture can be implemented using CMOS silicon, and have a very good "horizontal" and "vertical" scalability: Horizontal with more phases (hence, less harmonics); Vertical with better fab processes (better linearity and NF).

The icing on the cake: This same technology can also work for TX.

The future looks bright!





--
Dave - WØLEV
Just Let Darwin Work


Re: >> ( Want your radio to be listed here? Contact us.) #spyserver

prog
 

On Tue, Jan 16, 2018 at 08:14 am, Sergey Abramov wrote:
Another question, how does it work:
 
# Allow clients to control the device
#
allow_control = 1
 
What functionality is available to control users? Full IQ, what else?
If there are 10 clients, all will be available control?
 
 Аll users can not tune the device anywhere within the specified min/max frequency limits for example, 80m and 40m HAM bands?
Sorry for many questions.
Control includes the device's center frequency and gain stages if there are gain stages.
When there's more than 1 client connected, the control is disabled for all.
Yes, you can specify the min/max frequency. Don't be afraid to play and experiment. It will take you much less time.


Re: Just what is a "Polyphase harmonic rejection mixer "

Alberto I2PHD
 

On 1/16/2018 6:00 PM, doug wrote:

The best explanation I have found is a slide show; http://icd.ewi.utwente.nl/temp_files/158b39412cff88a4181bfec0f4449c24.pdf. I
There is something wrong with this url. I think it's the second /  What should the character be?

The PDF of the slide show can be found here :

http://icd.ewi.utwente.nl/publications/get_file.php?pub_id=563

--
73 Alberto I2PHD
Credo Ut Intelligam


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