On Jun 2, 3:39 am, "RF Caused By SDR-IQ"
wrote:
There is a new Yahoo grouphttp://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.

The use of ferrites can be a big help to contain the RFI. Check out
W1HIS's break through
work on common mode chokes.
www.yccc.org/Articles/W1HIS/CommonModeChokesW1HIS2006Apr06.pdf
Like most USB accesories, the noise from the PC tends to migrate out
the
cables.

Dallas Lankford found that 6 turns of USB wound on 2 FT-42-83 reduced
the RFI to
acceptable levels. He is planning to add 6 (or more ) FT-240-43 which
should eliminate
RFI.

Dallas didn't mention it. but I suspect similar treatment will be
needed on the antenna
port.

From initial reports, the SDR-IQ is a winner and will become a
classic.

Terry