Ray Anderson wrote:
> Dan-
>
>
>
> I missed the earlier part of this thread, but can you explain what the
> SA612 has to do with a QSD (quadrature sampling detector). The SA612
> mixer is a double balanced Gilbert cell type circuit. No sampling is
> involved.
>
>
>
> -Ray WB6TPU
>
>
>
> ________________________________
>
> From: soft_radio@yahoogroups.com [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, September 12, 2006 1:05 PM
> To: soft_radio@yahoogroups.com
> Subject: [soft_radio] New file uploaded to soft_radio
>
>
>
>
> Hello,
>
> This email message is a notification to let you know that
> a file has been uploaded to the Files area of the soft_radio
> group.
>
> File : /KA9RZA/QSD.png
> Uploaded by : ka9rza <[EMAIL PROTECTED]
> <mailto:wavelengths%40netzero.net> >
> Description : 2 SA612A's in a QSD Idea
>
> You can access this file at the URL:
> http://groups.yahoo.com/group/soft_radio/files/KA9RZA/QSD.png
> <http://groups.yahoo.com/group/soft_radio/files/KA9RZA/QSD.png>
> Regards,
>
> ka9rza <[EMAIL PROTECTED] <mailto:wavelengths%40netzero.net> >
You can integrate the outputs of any kind of mixer, and by using two fed
by a LO in Quadrature generate I/Q audio. The SA612A's have a conversion
gain so they make for a sensitive mixer.
FET switches are not only highly efficient but have an extremely high
IP3 compared to SA612A's
Switches are far cheaper also, personally I'll stick with the switches
unless going really high in frequency,
Cecil
KD5NWA
www.qrpradio.com www.hpsdr.com
"Sacred Cows make the best Hamburger!" Don Seglio Batuna
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