> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of Michael Tope
> Sent: Monday, August 14, 2006 11:17 PM
> To: garyschafer@comcast.net; 'Joe Subich, W4TV'; amps@contesting.com
> Subject: Re: [Amps] Checking for IMD
>
>
> ----- Original Message -----
> From: "Gary Schafer" <garyschafer@comcast.net>
>
> >> Sounds like the Flex Radio SDR-1000 would be ideally suited
> >> for this task. It has very a simple conversion scheme, high
> >> dynamic-range, and no analog AGC (either derived or applied).
> >> With a 44 KHz sampling rate sound card it should easily provide
> >> 15 to 20 KHz of useable spectrum viewing with good dynamic
> >> range.
> >>
> >> 73, Mike
> W4EF...........................................................
> >
> > Isn't that an FM radio? If so no good for a spectrum analyzer front end.
> >
>
> No, Gary, it's an HF receiver/transceiver that uses a PC soundcard
> to handle IF filtering and demodulation:
>
> http://www.flex-radio.com/
>
> http://www.flex-radio.com/articles_files/SDR-
> 1000%20April%202005%20QST%20Review.pdf
>
> With a quality sound card, the close-in dynamic range of this rig
> rivals some of the better high-end HF transceivers, and it is doing
> that with absolutely no analog AGC, which says to me that the
> analog stages ahead of the DSP must be very linear. Since filtering
> is DSP based, this scheme should be capable of very narrow
> resolution bandwidth.
>
> I mean if somebody could write the code to turn one of these
> things into a poor man's HF spectrum analyzer capable of doing
> quality transmitter IMD measurements, I'd probably buy one.
>
> 73, Mike W4EF...................................................
Thanks Mike, I am not familiar with that one.
73
Gary K4FMX
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