Date
21 - 31 of 31
Could the iPhone become an Ultralight ?
nz0i <charles.scharlau@...>
One more comment on this thread...
The iSDR iPhone app utilizes the same digital signal processing techniques found in PC-based SDR receivers. It does frequency domain filtering using a theoretical "brick wall" sinc filter algorithm to provide steep and deep bandpass filtering.
iSDR doesn't utilize any DSP hardware, but instead uses the iPhone/iPod/iPad processor to implement the DSP algorithms. It does all of its work at audio frequencies, so the receiver RF performance will depend largely on the quadrature sampling detector and antenna that you use with iSDR.
The fact that iSDR works on audio frequencies provides an advantage that is not documented, and not widely known: iSDR can convert your iPhone into a stand-alone high-performance audio filter. And it can do so with no specialized accessories or equipment to build or purchase. Just install and run the iSDR app on your Apple iOS product, connect some earphones, and configure iSDR to use external audio input. Place the microphone next to your ultralight receiver, then tune and adjust iSDR's mode and filter settings for optimum listening.
iSDR provides CW filtering down to 100 Hz. The SSB and AM filters are also adjustable. It should add some selectivity to ultralights that are lacking in that regard. It should also perform the function of a rudimentary panadapter, allowing you to view the narrow signals embedded in the audio spectrum coming from your ultralight's speaker.
73,
Charles
NZ0I
The iSDR iPhone app utilizes the same digital signal processing techniques found in PC-based SDR receivers. It does frequency domain filtering using a theoretical "brick wall" sinc filter algorithm to provide steep and deep bandpass filtering.
iSDR doesn't utilize any DSP hardware, but instead uses the iPhone/iPod/iPad processor to implement the DSP algorithms. It does all of its work at audio frequencies, so the receiver RF performance will depend largely on the quadrature sampling detector and antenna that you use with iSDR.
The fact that iSDR works on audio frequencies provides an advantage that is not documented, and not widely known: iSDR can convert your iPhone into a stand-alone high-performance audio filter. And it can do so with no specialized accessories or equipment to build or purchase. Just install and run the iSDR app on your Apple iOS product, connect some earphones, and configure iSDR to use external audio input. Place the microphone next to your ultralight receiver, then tune and adjust iSDR's mode and filter settings for optimum listening.
iSDR provides CW filtering down to 100 Hz. The SSB and AM filters are also adjustable. It should add some selectivity to ultralights that are lacking in that regard. It should also perform the function of a rudimentary panadapter, allowing you to view the narrow signals embedded in the audio spectrum coming from your ultralight's speaker.
73,
Charles
NZ0I
Michael <michael.setaazul@...>
Even the best iThingy will struggle with "garbage in", so it makes
sense that the frontend has to perform - and that an ulrx could
serve well. Thanks for this additional info, Charles. It will be very
interesting to hear of results, text and mp3, from a
ulrx microphone-fed into a iThingy.
What would be the lowest-spec notebook that would do it for an
uldx maverick?
Michael UK
toggle quoted message
Show quoted text
sense that the frontend has to perform - and that an ulrx could
serve well. Thanks for this additional info, Charles. It will be very
interesting to hear of results, text and mp3, from a
ulrx microphone-fed into a iThingy.
What would be the lowest-spec notebook that would do it for an
uldx maverick?
Michael UK
----- Original Message -----
From: "nz0i" <charles.scharlau@...>
To: <ultralightdx@...>
Sent: 02 August 2011 17:32
Subject: [ultralightdx] Re: Could the iPhone become an Ultralight ?
One more comment on this thread...
The iSDR iPhone app utilizes the same digital signal processing techniques found in PC-based SDR
receivers. It does frequency domain filtering using a theoretical "brick wall" sinc filter algorithm
to provide steep and deep bandpass filtering.
iSDR doesn't utilize any DSP hardware, but instead uses the iPhone/iPod/iPad processor to implement
the DSP algorithms. It does all of its work at audio frequencies, so the receiver RF performance
will depend largely on the quadrature sampling detector and antenna that you use with iSDR.
The fact that iSDR works on audio frequencies provides an advantage that is not documented, and not
widely known: iSDR can convert your iPhone into a stand-alone high-performance audio filter. And it
can do so with no specialized accessories or equipment to build or purchase. Just install and run
the iSDR app on your Apple iOS product, connect some earphones, and configure iSDR to use external
audio input. Place the microphone next to your ultralight receiver, then tune and adjust iSDR's mode
and filter settings for optimum listening.
iSDR provides CW filtering down to 100 Hz. The SSB and AM filters are also adjustable. It should add
some selectivity to ultralights that are lacking in that regard. It should also perform the function
of a rudimentary panadapter, allowing you to view the narrow signals embedded in the audio spectrum
coming from your ultralight's speaker.
73,
Charles
NZ0I
From: "nz0i" <charles.scharlau@...>
To: <ultralightdx@...>
Sent: 02 August 2011 17:32
Subject: [ultralightdx] Re: Could the iPhone become an Ultralight ?
One more comment on this thread...
The iSDR iPhone app utilizes the same digital signal processing techniques found in PC-based SDR
receivers. It does frequency domain filtering using a theoretical "brick wall" sinc filter algorithm
to provide steep and deep bandpass filtering.
iSDR doesn't utilize any DSP hardware, but instead uses the iPhone/iPod/iPad processor to implement
the DSP algorithms. It does all of its work at audio frequencies, so the receiver RF performance
will depend largely on the quadrature sampling detector and antenna that you use with iSDR.
The fact that iSDR works on audio frequencies provides an advantage that is not documented, and not
widely known: iSDR can convert your iPhone into a stand-alone high-performance audio filter. And it
can do so with no specialized accessories or equipment to build or purchase. Just install and run
the iSDR app on your Apple iOS product, connect some earphones, and configure iSDR to use external
audio input. Place the microphone next to your ultralight receiver, then tune and adjust iSDR's mode
and filter settings for optimum listening.
iSDR provides CW filtering down to 100 Hz. The SSB and AM filters are also adjustable. It should add
some selectivity to ultralights that are lacking in that regard. It should also perform the function
of a rudimentary panadapter, allowing you to view the narrow signals embedded in the audio spectrum
coming from your ultralight's speaker.
73,
Charles
NZ0I
nz0i <charles.scharlau@...>
--- In ultralightdx@..., "Michael" <michael.setaazul@...> wrote:
I would recommend doing plenty of homework before deciding to buy a notebook for SDR use. Check with knowledgeable SDR enthusiasts on some of the SDR groups for their recommendations.
73,
Charles
NZ0I
Notebook computers suffer from the same problem as cell phones: you've got to find one that offers stereo microphone input. Too often notebooks skimp on the sound card, and offer only a mono microphone input.
What would be the lowest-spec notebook that would do it for an
uldx maverick?
I would recommend doing plenty of homework before deciding to buy a notebook for SDR use. Check with knowledgeable SDR enthusiasts on some of the SDR groups for their recommendations.
73,
Charles
NZ0I
kevin asato <kc6pob@...>
| My Toshiba Netbook NB505 has one better than a stereo microphone input. It has a stereo line in option. I have max'ed it out on main memory - 2G SD RAM - but the Atom processor may not have enough horsepower to work in SDP applications. Haven't tried it in this application. SDR was not a consideration of mine when buying this Netbook earlier in the year. 73, kevin kc6pob |
--- On Tue, 8/2/11, nz0i wrote:
From: nz0i
Subject: [ultralightdx] Re: Could the iPhone become an Ultralight ?
To: ultralightdx@...
Date: Tuesday, August 2, 2011, 10:46 AM
--- In ultralightdx@..., "Michael" wrote:
>
> What would be the lowest-spec notebook that would do it for an
> uldx maverick?
Notebook computers suffer from the same problem as cell phones: you've got to find one that offers stereo microphone input. Too often notebooks skimp on the sound card, and offer only a mono microphone input.
I would recommend doing plenty of homework before deciding to buy a notebook for SDR use. Check with knowledgeable SDR enthusiasts on some of the SDR groups for their recommendations.
73,
Charles
NZ0I
Jeffrey Fritz <jnfritz07@...>
I can second what Charles said about a notebook used as an SDR--only in my case I tried using an MSI Wind U123 NetBook to process an IQ feed from my Alinco DX-R8 receiver.
The U123 does have a stereo microphone in so that wasn't an issue. But even if it had been, I have a Berringer USB Audio Interface that can handle stereo audio in. The problem was that, as Charles reported, the Atom CPU simply didn't have enough processing power to keep the SDR application working properly.
On a related topic, I have iSDR running on my iPad. Perhaps that could be used as well, but I suspect that, like the iPhone, the iPad also has only mono audio in.
73,
Jeff, WB1AAL
The U123 does have a stereo microphone in so that wasn't an issue. But even if it had been, I have a Berringer USB Audio Interface that can handle stereo audio in. The problem was that, as Charles reported, the Atom CPU simply didn't have enough processing power to keep the SDR application working properly.
On a related topic, I have iSDR running on my iPad. Perhaps that could be used as well, but I suspect that, like the iPhone, the iPad also has only mono audio in.
73,
Jeff, WB1AAL
nz0i <charles.scharlau@...>
You bring up a good point regarding stereo microphone USB adapters. They can work well with notebooks and yes, even with the iPad. But as others have mentioned, horsepower can be an issue with SDR software applications which are mostly written with desktop horsepower assumed.
You can get stereo microphone input into an iPad and use it with iSDR. I don't want to wander too far off topic on this ultrlightDX group, so I'll just point again to the forum where iSDR on iPad is discussed. There's even a picture: <http://digitalconfections.com/index.php?option=com_kunena&Itemid=61&func=view&catid=4&id=155> (You need to add a camera kit USB adapter to the iPad in order to access its USB capabilities.)
73,
Charles
NZ0I
toggle quoted message
Show quoted text
You can get stereo microphone input into an iPad and use it with iSDR. I don't want to wander too far off topic on this ultrlightDX group, so I'll just point again to the forum where iSDR on iPad is discussed. There's even a picture: <http://digitalconfections.com/index.php?option=com_kunena&Itemid=61&func=view&catid=4&id=155> (You need to add a camera kit USB adapter to the iPad in order to access its USB capabilities.)
73,
Charles
NZ0I
--- In ultralightdx@..., Jeffrey Fritz <jnfritz07@...> wrote:
I can second what Charles said about a notebook used as an SDR--only in my case I tried using an MSI Wind U123 NetBook to process an IQ feed from my Alinco DX-R8 receiver.
The U123 does have a stereo microphone in so that wasn't an issue. But even if it had been, I have a Berringer USB Audio Interface that can handle stereo audio in. The problem was that, as Charles reported, the Atom CPU simply didn't have enough processing power to keep the SDR application working properly.
On a related topic, I have iSDR running on my iPad. Perhaps that could be used as well, but I suspect that, like the iPhone, the iPad also has only mono audio in.
73,
Jeff, WB1AAL
Hi Jeff,
A number of Perseus SDR owners have used Atom-powered netbooks successfully; it's a matter of configuring settings properly. I owned the first gen MSI Wind U100 to process IQ and listen to audio, and with a correctly interfaced hard drive you can record up to 1600 khz bandwidth using Perseus and the U100 (the internal drive or eSATA connection is best).
Bjarne Mjelde, who runs the arcticdx.blogspot.com blog, also used the MSI U100 fine with his Perseus and a Winradio SDR I believe. He wrote about it on his blog.
When I had my Five Below blog for Perseus online, I covered in detail the use of the MSI netbook and the Perseus SDR together. You may find this spreadsheet of interest. It covers various configurations of AC vs DC power, hard drive types, and Atom CPU overclocking settings (the U100 had a factory bios available that permitted up to 24% overclocking):
A key observation is that if you don't want or need recording the SDR's bandwidth to hard drive (for later demodulation, filtering, & DXing across the entire band), the processor requirements really aren't that great.
What SDR software were you using to try and decode the IQ data from your Alinco? Maybe it's more demanding than the Perseus software.
This is getting off topic somewhat from ULRs, so if I can give you any further details regarding the MSI Wind netbook and SDRs, please contact me offline.
Guy Atkins
Puyallup, WA USA
--- In ultralightdx@..., Jeffrey Fritz wrote:
>
> I can second what Charles said about a notebook used as an SDR--only in my case I tried using an MSI Wind U123 NetBook to process an IQ feed from my Alinco DX-R8 receiver.
>
> The U123 does have a stereo microphone in so that wasn't an issue. But even if it had been, I have a Berringer USB Audio Interface that can handle stereo audio in. The problem was that, as Charles reported, the Atom CPU simply didn't have enough processing power to keep the SDR application working properly.
>
> On a related topic, I have iSDR running on my iPad. Perhaps that could be used as well, but I suspect that, like the iPhone, the iPad also has only mono audio in.
>
> 73,
>
> Jeff, WB1AAL
>
>
> I can second what Charles said about a notebook used as an SDR--only in my case I tried using an MSI Wind U123 NetBook to process an IQ feed from my Alinco DX-R8 receiver.
>
> The U123 does have a stereo microphone in so that wasn't an issue. But even if it had been, I have a Berringer USB Audio Interface that can handle stereo audio in. The problem was that, as Charles reported, the Atom CPU simply didn't have enough processing power to keep the SDR application working properly.
>
> On a related topic, I have iSDR running on my iPad. Perhaps that could be used as well, but I suspect that, like the iPhone, the iPad also has only mono audio in.
>
> 73,
>
> Jeff, WB1AAL
>
Marc Coevoet
Op 04-08-11 19:39, thinkdx schreef:
I suppose you could use linux, and then shut down the graphic shell when recording or doing cpu intensive tasks.
(some of these packages work without GUI: (or the GUI just calls shell commands)
http://packages.debian.org/stable/hamradio/ )
A rt(real time)kernel is available also.
https://rt.wiki.kernel.org/index.php/Main_Page
Marc
--
The "Penguin" has arrived - and he's not going away - ever.
What's on Shortwave guide: choose an hour, go!
http://shortwave.tk
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Hi Jeff,
A number of Perseus SDR owners have used Atom-powered netbooks
successfully; it's a matter of configuring settings properly.
I suppose you could use linux, and then shut down the graphic shell when recording or doing cpu intensive tasks.
(some of these packages work without GUI: (or the GUI just calls shell commands)
http://packages.debian.org/stable/hamradio/ )
A rt(real time)kernel is available also.
https://rt.wiki.kernel.org/index.php/Main_Page
Marc
--
The "Penguin" has arrived - and he's not going away - ever.
What's on Shortwave guide: choose an hour, go!
http://shortwave.tk
700+ Radio Stations on SW http://swstations.tk
300+ languages on SW http://radiolanguages.tk
Michael <michael.setaazul@...>
If this needs to continue elsewhere, I would much appreciate
a link. I have limited facilities, but would like to explore
SDR if it were feasible, so appreciate any practical input.
Michael UK
toggle quoted message
Show quoted text
a link. I have limited facilities, but would like to explore
SDR if it were feasible, so appreciate any practical input.
Michael UK
----- Original Message -----
From: "thinkdx" <dx@...>
To: <ultralightdx@...>
Sent: 04 August 2011 18:39
Subject: [ultralightdx] Re: Could the iPhone become an Ultralight ?
Hi Jeff,
A number of Perseus SDR owners have used Atom-powered netbooks
successfully; it's a matter of configuring settings properly. I owned
the first gen MSI Wind U100 to process IQ and listen to audio, and with
a correctly interfaced hard drive you can record up to 1600 khz
bandwidth using Perseus and the U100 (the internal drive or eSATA
connection is best).
Bjarne Mjelde, who runs the arcticdx.blogspot.com
<http://arcticdx.blogspot.com/> blog, also used the MSI U100 fine with
his Perseus and a Winradio SDR I believe. He wrote about it on his blog.
When I had my Five Below blog for Perseus online, I covered in detail
the use of the MSI netbook and the Perseus SDR together. You may find
this spreadsheet of interest. It covers various configurations of AC vs
DC power, hard drive types, and Atom CPU overclocking settings (the U100
had a factory bios available that permitted up to 24% overclocking):
http://www.mediafire.com/file/numho5gxxty/msi_wind_perseus.zip <Hi
Jeff,A number of Perseus SDR owners have used Atom-powered netbooks
successfully; it's a matter of configuring settings properly. I owned
the first gen MSI Wind U100 to process IQ and listen to audio, and with
a correctly interfaced hard drive you can record up to 1600 khz
bandwidth using Perseus and the U100 (the internal drive or eSATA
connection is best). Bjarne Mjelde, who runs the arcticdx.blogspot.com
blog, also used the MSI U100 fine with his Perseus and a Winradio SDR I
believe. He wrote about it on his blog.When I had my Five Below blog for
Perseus online, I covered in detail using the MSI netbook and the
Perseus SDR together. You may find this spreadsheet of use, in which I
compared various configurations of AC vs DC power, hard drive types, and
Atom CPU overclocking settings (the U100 had a factory bios available
that permitted up to 24%
overclocking):http://www.mediafire.com/file/numho5gxxty/msi_wind_perseus\;
.zip>
A key observation is that if you don't want or need recording the SDR's
bandwidth to hard drive (for later demodulation, filtering, & DXing
across the entire band), the processor requirements really aren't that
great.
What SDR software were you using to try and decode the IQ data from your
Alinco? Maybe it's more demanding than the Perseus software.
This is getting off topic somewhat from ULRs, so if I can give you any
further details regarding the MSI Wind netbook and SDRs, please contact
me offline.
Guy AtkinsPuyallup, WA USA
--- In ultralightdx@..., Jeffrey Fritz <jnfritz07@...>
wrote:
from my Alinco DX-R8 receiver.
handle stereo audio in. The problem was that, as Charles reported, the
Atom CPU simply didn't have enough processing power to keep the SDR
application working properly.
only mono audio in.
From: "thinkdx" <dx@...>
To: <ultralightdx@...>
Sent: 04 August 2011 18:39
Subject: [ultralightdx] Re: Could the iPhone become an Ultralight ?
Hi Jeff,
A number of Perseus SDR owners have used Atom-powered netbooks
successfully; it's a matter of configuring settings properly. I owned
the first gen MSI Wind U100 to process IQ and listen to audio, and with
a correctly interfaced hard drive you can record up to 1600 khz
bandwidth using Perseus and the U100 (the internal drive or eSATA
connection is best).
Bjarne Mjelde, who runs the arcticdx.blogspot.com
<http://arcticdx.blogspot.com/> blog, also used the MSI U100 fine with
his Perseus and a Winradio SDR I believe. He wrote about it on his blog.
When I had my Five Below blog for Perseus online, I covered in detail
the use of the MSI netbook and the Perseus SDR together. You may find
this spreadsheet of interest. It covers various configurations of AC vs
DC power, hard drive types, and Atom CPU overclocking settings (the U100
had a factory bios available that permitted up to 24% overclocking):
http://www.mediafire.com/file/numho5gxxty/msi_wind_perseus.zip <Hi
Jeff,A number of Perseus SDR owners have used Atom-powered netbooks
successfully; it's a matter of configuring settings properly. I owned
the first gen MSI Wind U100 to process IQ and listen to audio, and with
a correctly interfaced hard drive you can record up to 1600 khz
bandwidth using Perseus and the U100 (the internal drive or eSATA
connection is best). Bjarne Mjelde, who runs the arcticdx.blogspot.com
blog, also used the MSI U100 fine with his Perseus and a Winradio SDR I
believe. He wrote about it on his blog.When I had my Five Below blog for
Perseus online, I covered in detail using the MSI netbook and the
Perseus SDR together. You may find this spreadsheet of use, in which I
compared various configurations of AC vs DC power, hard drive types, and
Atom CPU overclocking settings (the U100 had a factory bios available
that permitted up to 24%
overclocking):http://www.mediafire.com/file/numho5gxxty/msi_wind_perseus\;
.zip>
A key observation is that if you don't want or need recording the SDR's
bandwidth to hard drive (for later demodulation, filtering, & DXing
across the entire band), the processor requirements really aren't that
great.
What SDR software were you using to try and decode the IQ data from your
Alinco? Maybe it's more demanding than the Perseus software.
This is getting off topic somewhat from ULRs, so if I can give you any
further details regarding the MSI Wind netbook and SDRs, please contact
me offline.
Guy AtkinsPuyallup, WA USA
--- In ultralightdx@..., Jeffrey Fritz <jnfritz07@...>
wrote:
in my case I tried using an MSI Wind U123 NetBook to process an IQ feed
I can second what Charles said about a notebook used as an SDR--only
from my Alinco DX-R8 receiver.
even if it had been, I have a Berringer USB Audio Interface that can
The U123 does have a stereo microphone in so that wasn't an issue. But
handle stereo audio in. The problem was that, as Charles reported, the
Atom CPU simply didn't have enough processing power to keep the SDR
application working properly.
be used as well, but I suspect that, like the iPhone, the iPad also has
On a related topic, I have iSDR running on my iPad. Perhaps that could
only mono audio in.
73,
Jeff, WB1AAL
Jeffrey Fritz <jnfritz07@...>
Thanks for all the comments and the suggestions about Perseus.
As I mentioned to Steve, I am using N4PY's Pegasus application running as a front end controlling both PowerSDR and an Alinco DX-R8 receiver simultaneously. This allows me plenty of processing power to handle all the CPU intensive tasks involved in doing a full blown SDR along with CAT. Though this setup is not an ultralight in any sense of the word.
More to the topic, I have a Grundig Aviator G6 and also a Grundig G8. I'll have to give one or both a try with Perseus running on my MSI Wnd U123 NetBook. Should be fun.
Jeff, WB1AAL
As I mentioned to Steve, I am using N4PY's Pegasus application running as a front end controlling both PowerSDR and an Alinco DX-R8 receiver simultaneously. This allows me plenty of processing power to handle all the CPU intensive tasks involved in doing a full blown SDR along with CAT. Though this setup is not an ultralight in any sense of the word.
More to the topic, I have a Grundig Aviator G6 and also a Grundig G8. I'll have to give one or both a try with Perseus running on my MSI Wnd U123 NetBook. Should be fun.
Jeff, WB1AAL
Michael <michael.setaazul@...>
Jeff, let us know how it works with the G8.
Michael UK
toggle quoted message
Show quoted text
Michael UK
----- Original Message -----
. .
More to the topic, I have a Grundig Aviator G6 and also a Grundig G8.
I'll have to give one or both a try with Perseus running on my
MSI Wnd U123 NetBook. Should be fun.
Jeff, WB1AAL
. .
More to the topic, I have a Grundig Aviator G6 and also a Grundig G8.
I'll have to give one or both a try with Perseus running on my
MSI Wnd U123 NetBook. Should be fun.
Jeff, WB1AAL