"Volker Tonn" wrote in message
...


George Blomfield schrieb:
On Wed, 21 Jan 2004 09:15:41 +0100, Volker Tonn
wrote:



George Blomfield schrieb:
...

The G303i is the first such software-defined radio for the consumer
market.

...the ICOM IC-PCR1000 is on the market for several years now...

odo



True, and the Winradio WR-1000 even earlier, but these are both
conventional architecture (although PC-controlled) radios.

I don't know the WR-100 from inside.
But _all_ alignment of the PCR1000 is done by software.


Proper software-defined radio is such where the entire last IF and
demodulator stage are executed in software (i.e. the signal is sampled
at the last IF frequency).

Do you really mean a DSP as or in the final IF-stage makes the
difference for a software defined radio? All other things is electronic
switchings controlled by software.

odo


In the extreme case of a software defined radio, the antenna would connect
to a fast A/D converter and the result is processed digitally. From a
practical sense that isn't done. It can be done with a mixer and a vfo to
convert to a 12 kHz IF and then fed directly to a sound card in a PC. The
rest of the signal processing is done digitally in the PC.

The WINRADIO has a little bit more done in electronics as it is a dual
conversion system. Once the signal is at the second IF (12 kHz) then
everything else is done in the PC. The final IF filtering and all
demodulation is done in the PC.

On the other hand, the R1000 represents a conventional radio that has had
the controlling processor and front panel moved to the PC. None of the
signal processing is done in the PC. This is an example of a PC controlled
radio vs. a software defined radio.


craigm

wrote in message . ..
On Tue, 20 Jan 2004 23:53:29 GMT, (George Blomfield)
wrote:


Caught this on the Yahoo Winradio group-
--------
WinRadio has just posted a new version of the G303i operating
software. You can now do a frequency calibration for the
radio by tweaking the reference frequency parameter
in the wrg3.ini file.

I successfully used this parameter to eliminate the
small frequency error (5 Hz at 10 Mhz) of my G303i.
---------------------

OH,,, gee... it's called "calibration". :-)


5Hz error at 10MHz is a wonderful calibration.
Quite incredible for a cheap radio.
So how does Winradio do it, is there an OCXO?

Tom

On Wed, 21 Jan 2004 18:05:33 GMT, wrote:

On Wed, 21 Jan 2004 11:23:56 GMT, (George Blomfield)
wrote:

I repeat- no one makes a decent affordable receiver that
could be considered state of the art.

Except Winradio... ;-)

OK George, tell you what- send me one and if it's everything
you claim its cracked up to be... no spurs, clean as a whistle
sitting inside my computer, no overload using a normal antenna,
super duper beats anything in sight- and I'll buy it.

:-)


Wow, if I were a dealer I would have now made a sale! :-)
But as I am not, sorry: Can't supply. Are there any Winradio dealers
out there reading this? (I trust you will share your commission with
me! ;-))

George