In article .com,
Steve wrote:

On Jun 2, 7:03 pm, "Ron Baker, Pluralitas!" wrote:
"Ron Baker, Pluralitas!" wrote in
m...



"RF Caused By SDR-IQ" wrote in message
...
There is a new Yahoo group
http://groups.yahoo.com/group/RFICausedBySDRIQ/which may be of interest
to those who own or may purchase an SDR-IQ. The purpose of the group is
to exchange information about RFI caused by the SDR-IQ and how to reduce
or eliminate the RFI.

Is it interfering with itself or other devices.

If it is interfering with itself it is perhaps not surprising.
It is an interesting looking gadget but it is not a radio.
It has no front end. It is open to the whole 500 Hz
to 30 MHz all the time.

I take that back. The SDR-14 is known to have that
problem. The SDR-IQ block diagram shows some
front end filters.



If you have a strong AM broadcast
station near by or a ham or CBer in the neighborhood
their signal will override everything else. The SDR-IQ would
make a good IF/back end. Better results would be
obtained by connecting the SDR-IQ to the IF of another
receiver. Or by putting an RF preselector in front of it.

The TenTec RX-320D is about the same price but has a
real radio front end. Unfortunately the TenTec has
an RS232 rather than USB interface and the TenTec only
has a 12 kHz bandwidth.

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To me, the most striking thing about this little box is that it's
actually USB powered. So, it wouldn't require an independent power
supply or wall wart. That means you could run it off a battery powered
laptop after you lost power in a storm or something. I guess that's
kind of neat, but if it generates so much RFI that a new Yahoo group
has appeared just to discuss that fact, I wouldn't let this thing
anywhere near my house.

The purpose in life for this unit appears to be as a spectrum analyzer
not a radio receiver.

I'm sure if you put it in a good metal box with ferrite chokes on the
cables it would tame the RFI.

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Telamon
Ventura, California