It seems to me that fast cheap A/D, storage, processing power, and
memory take us to the place where commercially mainstream hardware can
implement a software defined radio where one or more whole bands or
frequency segments can be recorded to storage media, much like a TiVo.

Of course, the ability to convert b - (b+K) Mhz to 0 ... K Mhz and
sample at 2K Mhz, has been technologically possible for quite some
time now, but also quite expensive.

So my question is: how long before some high-end manufacturer of
either scanner, SWL, or ham gear introduces the ability to record a
band segment and "replay" the whole segment to let you tune into any
signals in the band at will from the recording?

Has it been done yet? If not, I wonder how long it will be.

wrote:

So my question is: how long before some high-end manufacturer of
either scanner, SWL, or ham gear introduces the ability to record a
band segment and "replay" the whole segment to let you tune into any
signals in the band at will from the recording?

Has it been done yet? If not, I wonder how long it will be.



I'm sure there are wider band recording abilities out there, but these
are affordable by mere mortals:

==================================
the receiver can also record an entire 20 kHz wide IF spectrum, making
it possible to thoroughly analyze the received signal, and "re-receive"
the same signal again and again with different IF filter bandwidths,
notch filter, noise blanking or demodulator settings, to arrive at the
best possible reception of weak or interference-prone transmissions.

http://www.winradio.com/home/g313e.htm
===================================



80 Khz spectrum width recording:

===================================
Once you have listened to and grasped the concept of taking whole
blocks of spectrum and being able to work with it, let your mind wander.
Take this block and send it elsewhere to be listened to. Have a Time
Machine in one of the remote ham stations around the world and put your
expertise in programming or Internet use to the task. Now have your Time
Machine unfolding up to 80 kHz of spectrum filled with weak signals loud
and clear on the other side of the world. Is it real, oh yes it's real
and its time is now. A solar flare is in full strength while you are at
the office. Was there a band opening? Go home and find out. Listen, I
mean really listen. What was that? It sounded like a really weak signal.
Rewind, run the audio through the DSP, now tune it again. Got it a
little better, rewind, tweak the DSP, watch it on the spectrum analyzer,
is it there? From just plain fun listening to technical analysis of
solar activity, the possibilities are endless. All you need is the
equipment and a little bit of "time".

http://www.expandedspectrumsystems.com/prod2.html
=====================================


mike

On Feb 27, 10:09*am, m II wrote:
wrote:
So my question is: *how long before some high-end manufacturer of
either scanner, SWL, or ham gear introduces the ability to record a
band segment and "replay" the whole segment to let you tune into any
signals in the band at will from the recording?

Has it been done yet? *If not, I wonder how long it will be.

I'm sure there are wider band recording abilities out there, but these
are affordable by mere mortals:

==================================
the receiver can also record an entire 20 kHz wide IF spectrum, making
it possible to thoroughly analyze the received signal, and "re-receive"
the same signal again and again with different IF filter bandwidths,
notch filter, noise blanking or demodulator settings, to arrive at the
best possible reception of weak or interference-prone transmissions.

http://www.winradio.com/home/g313e.htm
===================================

80 Khz spectrum width recording:

===================================
*Once you have listened to and grasped the concept of taking whole
blocks of spectrum and being able to work with it, let your mind wander.
Take this block and send it elsewhere to be listened to. Have a Time
Machine in one of the remote ham stations around the world and put your
expertise in programming or Internet use to the task. Now have your Time
Machine unfolding up to 80 kHz of spectrum filled with weak signals loud
and clear on the other side of the world. Is it real, oh yes it's real
and its time is now. A solar flare is in full strength while you are at
the office. Was there a band opening? Go home and find out. Listen, I
mean really listen. What was that? It sounded like a really weak signal.
Rewind, run the audio through the DSP, now tune it again. Got it a
little better, rewind, tweak the DSP, watch it on the spectrum analyzer,
is it there? From just plain fun listening to technical analysis of
solar activity, the possibilities are endless. All you need is the
equipment and a little bit of "time".

http://www.expandedspectrumsystems.com/prod2.html
=====================================

mike

Mike - Nice Reply - Well Done ! )

you have learned well 'little grasshopper' ) ~ RHF
http://en.wikipedia.org/wiki/Kung_Fu_(TV_series)#Quotes
http://www.examiner.com/images/newsr...iaCAMPAIGN.jpg

RHF wrote:

Mike - Nice Reply - Well Done ! )


You inspire me, oh Great One.






mike

wrote in message
...
It seems to me that fast cheap A/D, storage, processing power, and
memory take us to the place where commercially mainstream hardware can
implement a software defined radio where one or more whole bands or
frequency segments can be recorded to storage media, much like a TiVo.

Of course, the ability to convert b - (b+K) Mhz to 0 ... K Mhz and
sample at 2K Mhz, has been technologically possible for quite some
time now, but also quite expensive.

So my question is: how long before some high-end manufacturer of
either scanner, SWL, or ham gear introduces the ability to record a
band segment and "replay" the whole segment to let you tune into any
signals in the band at will from the recording?

Has it been done yet? If not, I wonder how long it will be.

The SDR-IQ at around $500 has been out for well over a year now, along with
its higher priced brother- both from RF Space.
Both allow wideband spectrum recording. We used the IQ to record a 100KHz
portion of a 1296 MHz EME contest 2 years ago and then play it back laeter
digging out signals we did not even hear in the live contest.

Alternatively, devices like the Time Machine are stand alone inexpensive
receivers that also allow this. The Time Machine has been on the market for
at least 5 years, likely more.

Dale W4OP

In article
,
RHF wrote:

SNIP

you have learned well 'little grasshopper' ) ~ RHF

SNIP

Yeah, to bad you lack that ability.

--
Telamon
Ventura, California

In article Z1oxj.6679$xg6.908@trnddc07,
"Dale Parfitt" wrote:

wrote in message
...
It seems to me that fast cheap A/D, storage, processing power, and
memory take us to the place where commercially mainstream hardware can
implement a software defined radio where one or more whole bands or
frequency segments can be recorded to storage media, much like a TiVo.

Of course, the ability to convert b - (b+K) Mhz to 0 ... K Mhz and
sample at 2K Mhz, has been technologically possible for quite some
time now, but also quite expensive.

So my question is: how long before some high-end manufacturer of
either scanner, SWL, or ham gear introduces the ability to record a
band segment and "replay" the whole segment to let you tune into any
signals in the band at will from the recording?

Has it been done yet? If not, I wonder how long it will be.

The SDR-IQ at around $500 has been out for well over a year now, along with
its higher priced brother- both from RF Space.
Both allow wideband spectrum recording. We used the IQ to record a 100KHz
portion of a 1296 MHz EME contest 2 years ago and then play it back laeter
digging out signals we did not even hear in the live contest.

Alternatively, devices like the Time Machine are stand alone inexpensive
receivers that also allow this. The Time Machine has been on the market for
at least 5 years, likely more.


This concept has been around for decades and has been done using
magnetic tape to record over the air telemetry from remote locations of
what you might call one time "events" of military interest.

--
Telamon
Ventura, California

Telamon wrote:
In article Z1oxj.6679$xg6.908@trnddc07,
"Dale Parfitt" wrote:

wrote in message
...
It seems to me that fast cheap A/D, storage, processing power, and
memory take us to the place where commercially mainstream hardware can
implement a software defined radio where one or more whole bands or
frequency segments can be recorded to storage media, much like a TiVo.

Of course, the ability to convert b - (b+K) Mhz to 0 ... K Mhz and
sample at 2K Mhz, has been technologically possible for quite some
time now, but also quite expensive.

So my question is: how long before some high-end manufacturer of
either scanner, SWL, or ham gear introduces the ability to record a
band segment and "replay" the whole segment to let you tune into any
signals in the band at will from the recording?

Has it been done yet? If not, I wonder how long it will be.
The SDR-IQ at around $500 has been out for well over a year now, along with
its higher priced brother- both from RF Space.
Both allow wideband spectrum recording. We used the IQ to record a 100KHz
portion of a 1296 MHz EME contest 2 years ago and then play it back laeter
digging out signals we did not even hear in the live contest.

Alternatively, devices like the Time Machine are stand alone inexpensive
receivers that also allow this. The Time Machine has been on the market for
at least 5 years, likely more.


This concept has been around for decades and has been done using
magnetic tape to record over the air telemetry from remote locations of
what you might call one time "events" of military interest.
IF Shifted to fit the 4.5 mHz video passband band on old video tape
recorders, no?

dave wrote:

Telamon wrote:
In article Z1oxj.6679$xg6.908@trnddc07,
"Dale Parfitt" wrote:

wrote in message

...
It seems to me that fast cheap A/D, storage, processing power, and
memory take us to the place where commercially mainstream hardware can
implement a software defined radio where one or more whole bands or
frequency segments can be recorded to storage media, much like a TiVo.

Of course, the ability to convert b - (b+K) Mhz to 0 ... K Mhz and
sample at 2K Mhz, has been technologically possible for quite some
time now, but also quite expensive.

So my question is: how long before some high-end manufacturer of
either scanner, SWL, or ham gear introduces the ability to record a
band segment and "replay" the whole segment to let you tune into any
signals in the band at will from the recording?

Has it been done yet? If not, I wonder how long it will be.
The SDR-IQ at around $500 has been out for well over a year now, along
with its higher priced brother- both from RF Space.
Both allow wideband spectrum recording. We used the IQ to record a
100KHz portion of a 1296 MHz EME contest 2 years ago and then play it
back laeter digging out signals we did not even hear in the live
contest.

Alternatively, devices like the Time Machine are stand alone inexpensive
receivers that also allow this. The Time Machine has been on the market
for at least 5 years, likely more.


This concept has been around for decades and has been done using
magnetic tape to record over the air telemetry from remote locations of
what you might call one time "events" of military interest.
IF Shifted to fit the 4.5 mHz video passband band on old video tape
recorders, no?

Don't forget the video recorders, at least the consumer models, have limited
S/N characteristics and dynamic range. They are also designed to work with
signals that have sync bars. There would be interruptions in the signal as
the heads switch.

In article ,
dave wrote:

Telamon wrote:
In article Z1oxj.6679$xg6.908@trnddc07,
"Dale Parfitt" wrote:

wrote in message
...
It seems to me that fast cheap A/D, storage, processing power, and
memory take us to the place where commercially mainstream hardware can
implement a software defined radio where one or more whole bands or
frequency segments can be recorded to storage media, much like a TiVo.

Of course, the ability to convert b - (b+K) Mhz to 0 ... K Mhz and
sample at 2K Mhz, has been technologically possible for quite some
time now, but also quite expensive.

So my question is: how long before some high-end manufacturer of
either scanner, SWL, or ham gear introduces the ability to record a
band segment and "replay" the whole segment to let you tune into any
signals in the band at will from the recording?

Has it been done yet? If not, I wonder how long it will be.
The SDR-IQ at around $500 has been out for well over a year now, along
with
its higher priced brother- both from RF Space.
Both allow wideband spectrum recording. We used the IQ to record a 100KHz
portion of a 1296 MHz EME contest 2 years ago and then play it back laeter
digging out signals we did not even hear in the live contest.

Alternatively, devices like the Time Machine are stand alone inexpensive
receivers that also allow this. The Time Machine has been on the market
for
at least 5 years, likely more.


This concept has been around for decades and has been done using
magnetic tape to record over the air telemetry from remote locations of
what you might call one time "events" of military interest.

IF Shifted to fit the 4.5 mHz video passband band on old video tape
recorders, no?

That part I could not tell you about.

--
Telamon
Ventura, California