Date   

Re: Airspy architecture

jdow
 

Using both I and Q outputs of a tuner into an SDR is a "Hail Mary" desperation ploy. Results with the E4000 show this. You get quadrature phase and amplitude errors that have to be balanced out, poorly in general. The AirSpy appears to need exceptionally clean in this regard using its sampler at twice the rate using every other sample as I or Q.

The mixer in the R820T is unknown. It is believed to be an image rejection mixer based on performance. Some versions of the rtlsdr.dll source code included code for fine tuning the balance. So far nobody seems to have managed to make it appear to do anything.

Call up the Rafael people and get a non-disclosure signed, probably concurrent with an order for a million chips, for more information.

{^_^}

On 2015-02-02 03:25, Alberto I2PHD i2phd@weaksignals.com [airspy] wrote:


A few naive questions, originated from my attempt to understand the architecture
of the Airspy.

The tuner is an R820T2, which converts in the analog domain down to a low IF,
just above 4 MHz.

First question : from the simplified block diagram of that chip, it doesn't seem
to use a quadrature
mixer. That notwithstanding, the image rejection reported from its data sheet is
65 dBc... how is
that possible ?

A more detailed look shows that it has two IF outputs, pin 12 and pin 13, marked
as IF N and IF P.
In the unconfirmed hypothesis that those outputs are actually I and Q, in other
words the mixer
is as a matter of facts a quadrature mixer, then those two outputs must be
digitized by the
12-bit, 80 MHz high speed ADC of the NXP LPC-4370 processor, which is a single ADC.
So it should work in a time interleaved fashion... is this correct ?

A bit of light on the Airspy architecture would be welcome, thanks.

--
/*73 Alberto I2PHD*
Credo Ut Intelligam




/


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Re: : Re: [SDR#] bandwidth

David Miles <bwex@...>
 

On 02/02/2015 17:06, auroraradio@... [SDRSharp] wrote:
 

Maybe this is something interesting for you GUI for rtl_power

  or this one GUI for RTL_POWER

 

73

Peter

Thank you Peter for the link. My problem is that I do not understand the software side of all this stuff. I was hoping initially that I would be able to just tweek SDR# and cover any or all the bandwidth as I pleased - not so obviously! I have searched around and found out that there are quite a few SDR's that cover much much larger bandwidths than the normal 2.4Mhz They do  start to get quite expensive though ie. 20Mhz bandwidth - $299 and even higher and more expensive.  http://members.home.nl/fklaasen/Roundup.html

David Miles.



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Re: Airspy architecture

Andrea IW0HDV
 

Hi Alberto, Leif,

  *am* iw0hdv


Re: : Re: AW: Airspy architecture

Siegfried Jackstien
 

Thanks for that info youssef :-)

Greetz

Sigi

Dg9bfc




-----Ursprüngliche Nachricht-----
Von: airspy@yahoogroups.co.uk [mailto:airspy@yahoogroups.co.uk]
Gesendet: Montag, 2. Februar 2015 15:10
An: airspy@yahoogroups.co.uk
Betreff: Re:: Re: AW: [airspy] Airspy architecture



Hi,

The tuner offers two ways for calibrating the IQ balance. One is manual
with phase and gain adjustment registers and the other is fully automated.
The automated method uses long term correlation between the legit signals
and their images to generate error signals. These signals are injected
back to the gain stages for gain adjustment, and the phase splitters
(Frequency dividers used to generate the IQ LO). The test signals are
taken from the RF input. Without this calibration, the image suppression
is still good around 40 - 45dB.
The IF filter is adjusted to the samplerate with roll-offs at 500kHz on
each side. So it doubles as anti-aliasing filter too.
I hope this helps.

Youssef



---In airspy@yahoogroups.co.uk, <i2phd@weaksignals.com> wrote :


On 2/2/2015 1:37 PM, 'siegfried jackstien' siegfried.jackstien@freenet.de
[airspy] wrote:





I would guess the if n and if p means if negative and if
positive (balanced
output) and NOT be I/Q signals

The r820t tuner does only have low if out and not 0hz if
(i/q)


Yes, that was also my first guess, but the high image rejection made
me wondering...
And in any case you can have I/Q outputs also if the IF is not at
zero.


On 2/2/2015 3:45 PM, Leif Asbrink leif@sm5bsz.com [airspy] wrote:


The R820T2 has I and Q internally and combines
them to a real valued signal with excellent image
suppression.

The output is balanced to fit the balanced input
of typical AD converters.

I have no idea how they can get such a good image
suppression...



Hi Leif,

That explains a lot. From the simplified block diagram found on Internet
the use
of a quadrature mixer is not apparent, and that made me scraping my
head...

Yes, achieving 65 dB of image rejection working in the analog domain is
really
a feat... kudos to them... everything must have been balanced with
extraordinary
care...

Thanks Sigi and Leif.



--
73 Alberto I2PHD
Credo Ut Intelligam






________________________________

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Re: [SDR#] Re:: HF USING SDR# and DX PATROL

BARRIE PARSONS <g4yjsbarrie@...>
 

Date: Mon, 2 Feb 2015 17:22:22 +0000
Subject: Re: [SDR#] Re:: HF USING SDR# and DX PATROL
Dear Dave.
Thanks for your post.Ithought of removing the cover and checking the connections for the reason that it just seems that there is no aerial connected.
But how in god's name do you get the cover off?ADVISE PLEASE.I would appreciate also a list of settings you have set up for both hf and vhf and above mate Thanks very much Barrie g4yjs.
0151 445 3622
If you would care to talk to me please reverse the call Dave.
 
BARRIE PARSONS.


From: "dave@... [SDRSharp]"
To: SDRSharp@...
Sent: Monday, 2 February 2015, 17:02
Subject: [SDR#] Re:: HF USING SDR# and DX PATROL

 
I've got a DX Patrol and love it. I had a similar issue with mine when I received it (4-5 months ago).

I noticed poor/no reception on HF bands and thought I was doing something wrong. At one point I disconnected my antenna and the inner part of the SMA connector on the radio came out with my antenna feed.

I took the cover off the radio and saw that a very small amount of solder was used to secure this part and that it had broken and wasn't making contact. I'm not sure if this was from the force I was putting on it or if it happened in transit.

I carefully re-inserted the center conductor/insulator and soldered it back to the board. I also reflowed/added some solder to the VHF connection just to be safe. It has been working fantastically since then.

Hope this helps!

Dave




DXPATROL AND SDR#

BARRIE PARSONS <g4yjsbarrie@...>
 

 
BARRIE PARSDate: Mon, 2 Feb 2015 17:22:22 +0000
Subject: Re: [SDR#] Re:: HF USING SDR# and DX PATROL
Dear Dave.
Thanks for your post.Ithought of removing the cover and checking the connections for the reason that it just seems that there is no aerial connected.
But how in god's name do you get the cover off?ADVISE PLEASE.I would appreciate also a list of settings you have set up for both hf and vhf and above mate Thanks very much Barrie g4yjs.
0151 445 3622
If you would care to talk to me please reverse the call Dave.ONS.


Re: : Re: [SDR#] bandwidth

Peter
 

Maybe this is something interesting for you GUI for rtl_power

  or this one GUI for RTL_POWER

 

73

Peter


Re: : HF USING SDR# and DX PATROL

Dave Campbell
 

I've got a DX Patrol and love it. I had a similar issue with mine when I received it (4-5 months ago).

I noticed poor/no reception on HF bands and thought I was doing something wrong. At one point I disconnected my antenna and the inner part of the SMA connector on the radio came out with my antenna feed.

I took the cover off the radio and saw that a very small amount of solder was used to secure this part and that it had broken and wasn't making contact. I'm not sure if this was from the force I was putting on it or if it happened in transit.

I carefully re-inserted the center conductor/insulator and soldered it back to the board. I also reflowed/added some solder to the VHF connection just to be safe. It has been working fantastically since then.

Hope this helps!

Dave


Re: : Re: AW: Airspy architecture

Martin Smith
 

I'm sure a lot of it is under NDA, probably the easiest way to try and work out the internal workings would be to search patents in the last 15 years, like:
"Mixer having compensation for harmonics of local oscillator signal" - US 6404263 B1
"Double balanced FET mixer with high IP3 and IF response down to DC levels" - US 6957055 B2



From: "Alberto I2PHD i2phd@... [airspy]"
To: airspy@...
Sent: Monday, 2 February 2015, 15:26:21
Subject: Re: : Re: AW: [airspy] Airspy architecture



On 2/2/2015 4:09 PM, sdrsharp@... [airspy] wrote:

The tuner offers two ways for calibrating the IQ balance. One is manual with phase and gain adjustment registers and the other is fully automated. The automated method uses long term correlation between the legit signals and their images to generate error signals. These signals are injected back to the gain stages for gain adjustment, and the phase splitters (Frequency dividers used to generate the IQ LO). The test signals are taken from the RF input. Without this calibration, the image suppression is still good around 40 - 45dB.
The IF filter is adjusted to the samplerate with roll-offs at 500kHz on each side. So it doubles as anti-aliasing filter too.
I hope this helps.

Youssef


Youssef,

   thanks for that explanation. Things are becoming more and more clear. You must have access to information
about the innards of that tuner surely much more detailed of what it is freely available on Internet... :-)

--
73 Alberto I2PHD
Credo Ut Intelligam






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Re: : Re: AW: Airspy architecture

Alberto I2PHD
 

On 2/2/2015 4:09 PM, sdrsharp@... [airspy] wrote:

The tuner offers two ways for calibrating the IQ balance. One is manual with phase and gain adjustment registers and the other is fully automated. The automated method uses long term correlation between the legit signals and their images to generate error signals. These signals are injected back to the gain stages for gain adjustment, and the phase splitters (Frequency dividers used to generate the IQ LO). The test signals are taken from the RF input. Without this calibration, the image suppression is still good around 40 - 45dB.
The IF filter is adjusted to the samplerate with roll-offs at 500kHz on each side. So it doubles as anti-aliasing filter too.
I hope this helps.

Youssef


Youssef,

�� thanks for that explanation. Things are becoming more and more clear. You must have access to information
about the innards of that tuner surely much more detailed of what it is freely available on Internet... :-)

--
73 Alberto I2PHD
Credo Ut Intelligam






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Re: : Re: AW: Airspy architecture

sdrsharp
 

Hi,

The tuner offers two ways for calibrating the IQ balance. One is manual with phase and gain adjustment registers and the other is fully automated. The automated method uses long term correlation between the legit signals and their images to generate error signals. These signals are injected back to the gain stages for gain adjustment, and the phase splitters (Frequency dividers used to generate the IQ LO). The test signals are taken from the RF input. Without this calibration, the image suppression is still good around 40 - 45dB.
The IF filter is adjusted to the samplerate with roll-offs at 500kHz on each side. So it doubles as anti-aliasing filter too.
I hope this helps.

Youssef


---In airspy@..., <i2phd@...> wrote :

On 2/2/2015 1:37 PM, 'siegfried jackstien' siegfried.jackstien@... [airspy] wrote:

I would guess the if n and if p means if negative and if positive (balanced
output) and NOT be I/Q signals

The r820t tuner does only have low if out and not 0hz if (i/q)
Yes, that was also my first guess, but the high image rejection made me wondering...
And in any case you can have I/Q outputs also if the IF is not at zero.

On 2/2/2015 3:45 PM, Leif Asbrink leif@... [airspy] wrote:

The R820T2 has I and Q internally and combines
them to a real valued signal with excellent image
suppression. 

The output is balanced to fit the balanced input 
of typical AD converters.

I have no idea how they can get such a good image
suppression...
Hi Leif,

  That explains a lot. From the simplified block diagram found on Internet the use
of a quadrature mixer is not apparent, and that made me scraping my head...

Yes, achieving 65 dB of image rejection working in the analog domain is really
a feat... kudos to them... everything must have been balanced with extraordinary
care...

Thanks Sigi and Leif.


--
73 Alberto I2PHD
Credo Ut Intelligam






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Re: [SDR#] bandwidth

Marion D. Kitchens <k4gok@...>
 


Hi Sigi
Good to hear from you again :-)   My SDR# computer is down for for upgrading at the moment. 
Hope your holiday season was good and your new year better ...
Yes, I am getting off topic again....
Marion
 
 
On Mon, 2 Feb 2015 09:36:46 -0000 "'siegfried jackstien' siegfried.jackstien@... [SDRSharp]" <SDRSharp@...> writes:

 

Hello marion

Try this:

http://nutsaboutnets.com/touchstone/

touchstone software (free version) stitches the samples together ... so if needed you can see the whole tune area (or just a part of it)

dg9bfc

sigi

> -----Ursprüngliche Nachricht-----
> Von: SDRSharp@... [mailto:SDRSharp@...]
> Gesendet: Montag, 2. Februar 2015 04:05
> An: SDRSharp@...
> Betreff: Re: [SDR#] bandwidth
>
>
>
> 
> That's not what I said, nor did. By setting up the SDR# Step Size to a
> large number, I was able to scan from about 60 MHZ to about 2 GHz by
> scrolling the mouse wheel. For example by setting the Step Size to 500
> KHz, each "detent" of the mouse wheel moved the spectrum display by 500
> KHz. I scanned the above mentioned spectrum in a very few minutes,
> looking for strong signals that might overload my E4000 dongle. Yes, I
> found the trouble maker in short order -- probably a pager transmitter.
> Seems something like that might help the OP look for those extraneous
> signals he wanted to check for.
> bye ya'll
>
> Marion
>
>
> On Sun, 01 Feb 2015 16:48:37 -0500 "MCH mch@... [SDRSharp]"
> writes:
>
>
>
> You got 10 MHz BW out of a FCD? Please - tell us how.
>
> Joe M.
>
> On 2/1/2015 4:27 PM, 'Marion D. Kitchens' k4gok@... [SDRSharp]
> wrote:
> >
> > Guess I did it without knowing it was impossible......
> > On Sun, 01 Feb 2015 15:55:45 -0500 "MCH mch@...
>
> > [SDRSharp]" > > > writes:
> >
> > Not possible.
> >
> > Joe M.
> >
> > On 2/1/2015 3:52 PM, David Miles bwex@... [SDRSharp]
> wrote:
> > > As Airspy is about £100, I would like to able to somehow achieve
> the
> > > 10Meg bandwidth with my £10 "funcube" type dongle if possible. I
> have
> > > tried looking around in the waterfall without any success so
> far. If
> > > Marion can remember any more details of how it was done, or
> > anybody else
> > > has any ideas I would be grateful to hear about them.
>
>
>
>
>

 


Re: Airspy architecture

Leif Asbrink
 

Hi Alberto,

The R820T2 has I and Q internally and combines
them to a real valued signal with excellent image
suppression.

The output is balanced to fit the balanced input
of typical AD converters.

I have no idea how they can get such a good image
suppression...

73

Leif




<airspy@yahoogroups.co.uk> wrote:



A few naive questions, originated from my attempt to understand the architecture of the Airspy.

The tuner is an R820T2, which converts in the analog domain down to a low IF, just above 4 MHz.

First question : from the simplified block diagram of that chip, it doesn't seem to use a quadrature
mixer. That notwithstanding, the image rejection reported from its data sheet is 65 dBc... how is
that possible ?

A more detailed look shows that it has two IF outputs, pin 12 and pin 13, marked as IF N and IF P.
In the unconfirmed hypothesis that those outputs are actually I and Q, in other words the mixer
is as a matter of facts a quadrature mixer, then those two outputs must be digitized by the
12-bit, 80 MHz high speed ADC of the NXP LPC-4370 processor, which is a single ADC.
So it should work in a time interleaved fashion... is this correct ?

A bit of light on the Airspy architecture would be welcome, thanks.

--
73 Alberto I2PHD
Credo Ut Intelligam






------------------------------------------------

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www.avast.com



Re: Airspy architecture

Alberto I2PHD
 

On 2/2/2015 1:37 PM, 'siegfried jackstien' siegfried.jackstien@... [airspy] wrote:

I would guess the if n and if p means if negative and if positive (balanced
output) and NOT be I/Q signals

The r820t tuner does only have low if out and not 0hz if (i/q)
Yes, that was also my first guess, but the high image rejection made me wondering...
And in any case you can have I/Q outputs also if the IF is not at zero.

On 2/2/2015 3:45 PM, Leif Asbrink leif@... [airspy] wrote:

The R820T2 has I and Q internally and combines
them to a real valued signal with excellent image
suppression. 

The output is balanced to fit the balanced input 
of typical AD converters.

I have no idea how they can get such a good image
suppression...
Hi Leif,

� That explains a lot. From the simplified block diagram found on Internet the use
of a quadrature mixer is not apparent, and that made me scraping my head...

Yes, achieving 65 dB of image rejection working in the analog domain is really
a feat... kudos to them... everything must have been balanced with extraordinary
care...

Thanks Sigi and Leif.


--
73 Alberto I2PHD
Credo Ut Intelligam






This email has been checked for viruses by Avast antivirus software.
www.avast.com



Re: Airspy architecture

Siegfried Jackstien
 

Hello alberto

I would guess the if n and if p means if negative and if positive (balanced
output) and NOT be I/Q signals

The r820t tuner does only have low if out and not 0hz if (i/q)

Hth

Dg9bfc

Sigi

-----Ursprüngliche Nachricht-----
Von: airspy@yahoogroups.co.uk [mailto:airspy@yahoogroups.co.uk]
Gesendet: Montag, 2. Februar 2015 11:26
An: airspy@yahoogroups.co.uk
Betreff: [airspy] Airspy architecture



A few naive questions, originated from my attempt to understand the
architecture of the Airspy.

The tuner is an R820T2, which converts in the analog domain down to a low
IF, just above 4 MHz.

First question : from the simplified block diagram of that chip, it
doesn't seem to use a quadrature
mixer. That notwithstanding, the image rejection reported from its data
sheet is 65 dBc... how is
that possible ?

A more detailed look shows that it has two IF outputs, pin 12 and pin 13,
marked as IF N and IF P.
In the unconfirmed hypothesis that those outputs are actually I and Q, in
other words the mixer
is as a matter of facts a quadrature mixer, then those two outputs must be
digitized by the
12-bit, 80 MHz high speed ADC of the NXP LPC-4370 processor, which is a
single ADC.
So it should work in a time interleaved fashion... is this correct ?

A bit of light on the Airspy architecture would be welcome, thanks.


--
73 Alberto I2PHD
Credo Ut Intelligam







________________________________

<http://www.avast.com/> This email has been checked for viruses by
Avast antivirus software.
www.avast.com <http://www.avast.com/>



Airspy architecture

Alberto I2PHD
 

A few naive questions, originated from my attempt to understand the architecture of the Airspy.

The tuner is an R820T2, which converts in the analog domain down to a low IF, just above 4 MHz.

First question : from the simplified block diagram of that chip, it doesn't seem to use a quadrature
mixer. That notwithstanding, the image rejection reported from its data sheet is 65 dBc... how is
that possible ?

A more detailed look shows that it has two IF outputs, pin 12 and pin 13, marked as IF N and IF P.
In the unconfirmed hypothesis that those outputs are actually I and Q, in other words the mixer
is as a matter of facts a quadrature mixer, then those two outputs must be digitized by the
12-bit, 80 MHz high speed ADC of the NXP LPC-4370 processor, which is a single ADC.
So it should work in a time interleaved fashion... is this correct ?

A bit of light on the Airspy architecture would be welcome, thanks.

--
73 Alberto I2PHD
Credo Ut Intelligam







This email has been checked for viruses by Avast antivirus software.
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Re: : AW: Re:: HDSDR

Siegfried Jackstien
 

Youre welcome ... always willing to help if I can

(isn’t that what these groups are made for?!?)

Sure you get a faster start if I help you with the first steps... but if you
used autocad before ... then mmana is easy :-)

(autocad is a lot more compicated in my view)

Greetz

Sigi

Dg9bfc

Ps ... yepp ... become a member of mmana group and you will get loads of
help there

-----Ursprüngliche Nachricht-----
Von: airspy@yahoogroups.co.uk [mailto:airspy@yahoogroups.co.uk]
Gesendet: Sonntag, 1. Februar 2015 20:55
An: airspy@yahoogroups.co.uk
Betreff: Re:: AW: [airspy] Re:: HDSDR



Thanks Sigi

I should be able to figure it out after I read the manual.. I have used
AutoCad in the past, and mmana should be simpler to use..

If I cannot figure it out, I will contact you for some help.. We are
having some landscaping and tree pruning contractors here for a while and
its taking most of my time with them...

bobbie
kd4lv


Re: [SDR#] bandwidth

Siegfried Jackstien
 

Hello marion

Try this:

http://nutsaboutnets.com/touchstone/

touchstone software (free version) stitches the samples together ... so if needed you can see the whole tune area (or just a part of it)

dg9bfc

sigi

-----Ursprüngliche Nachricht-----
Von: SDRSharp@yahoogroups.co.uk [mailto:SDRSharp@yahoogroups.co.uk]
Gesendet: Montag, 2. Februar 2015 04:05
An: SDRSharp@yahoogroups.co.uk
Betreff: Re: [SDR#] bandwidth




That's not what I said, nor did. By setting up the SDR# Step Size to a
large number, I was able to scan from about 60 MHZ to about 2 GHz by
scrolling the mouse wheel. For example by setting the Step Size to 500
KHz, each "detent" of the mouse wheel moved the spectrum display by 500
KHz. I scanned the above mentioned spectrum in a very few minutes,
looking for strong signals that might overload my E4000 dongle. Yes, I
found the trouble maker in short order -- probably a pager transmitter.
Seems something like that might help the OP look for those extraneous
signals he wanted to check for.
bye ya'll

Marion


On Sun, 01 Feb 2015 16:48:37 -0500 "MCH mch@nb.net [SDRSharp]"
<SDRSharp@yahoogroups.co.uk> writes:



You got 10 MHz BW out of a FCD? Please - tell us how.

Joe M.

On 2/1/2015 4:27 PM, 'Marion D. Kitchens' k4gok@juno.com [SDRSharp]
wrote:
>
> Guess I did it without knowing it was impossible......
> On Sun, 01 Feb 2015 15:55:45 -0500 "MCH mch@nb.net
<mailto:mch@nb.net>
> [SDRSharp]" <SDRSharp@yahoogroups.co.uk
> <mailto:SDRSharp@yahoogroups.co.uk>> writes:
>
> Not possible.
>
> Joe M.
>
> On 2/1/2015 3:52 PM, David Miles bwex@talktalk.net [SDRSharp]
wrote:
> > As Airspy is about £100, I would like to able to somehow achieve
the
> > 10Meg bandwidth with my £10 "funcube" type dongle if possible. I
have
> > tried looking around in the waterfall without any success so
far. If
> > Marion can remember any more details of how it was done, or
> anybody else
> > has any ideas I would be grateful to hear about them.





Re: [SDR#] bandwidth

Marion D. Kitchens <k4gok@...>
 


That's not what I said,  nor did.  By setting up the SDR# Step Size to a large  number, I was able to scan from about 60 MHZ to about 2 GHz by scrolling the mouse wheel.  For example by setting the Step Size to 500 KHz, each "detent" of the mouse wheel moved the spectrum display by 500 KHz.  I scanned the above mentioned spectrum in a very few minutes, looking for strong signals that might overload my E4000 dongle.  Yes, I found the trouble maker in short order  -- probably a pager transmitter.
Seems something like that might help the OP look for those extraneous signals he wanted to check for.
bye ya'll   
 
Marion
 
 
On Sun, 01 Feb 2015 16:48:37 -0500 "MCH mch@... [SDRSharp]" <SDRSharp@...> writes:

 

You got 10 MHz BW out of a FCD? Please - tell us how.

Joe M.

On 2/1/2015 4:27 PM, 'Marion D. Kitchens' k4gok@... [SDRSharp] wrote:
>
> Guess I did it without knowing it was impossible......
> On Sun, 01 Feb 2015 15:55:45 -0500 "MCH mch@...
> [SDRSharp]" > > writes:
>
> Not possible.
>
> Joe M.
>
> On 2/1/2015 3:52 PM, David Miles bwex@... [SDRSharp] wrote:
> > As Airspy is about £100, I would like to able to somehow achieve the
> > 10Meg bandwidth with my £10 "funcube" type dongle if possible. I have
> > tried looking around in the waterfall without any success so far. If
> > Marion can remember any more details of how it was done, or
> anybody else
> > has any ideas I would be grateful to hear about them.

 


Re: [SDR#] bandwidth

Joe M.
 

You got 10 MHz BW out of a FCD? Please - tell us how.

Joe M.

On 2/1/2015 4:27 PM, 'Marion D. Kitchens' k4gok@juno.com [SDRSharp] wrote:

Guess I did it without knowing it was impossible......
On Sun, 01 Feb 2015 15:55:45 -0500 "MCH mch@nb.net <mailto:mch@nb.net>
[SDRSharp]" <SDRSharp@yahoogroups.co.uk
<mailto:SDRSharp@yahoogroups.co.uk>> writes:

Not possible.

Joe M.

On 2/1/2015 3:52 PM, David Miles bwex@talktalk.net [SDRSharp] wrote:
> As Airspy is about £100, I would like to able to somehow achieve the
> 10Meg bandwidth with my £10 "funcube" type dongle if possible. I have
> tried looking around in the waterfall without any success so far. If
> Marion can remember any more details of how it was done, or
anybody else
> has any ideas I would be grateful to hear about them.