[TangerineSDR] TangerineSDR Digest, Vol 27, Issue 6

David Witten wittend at wwrinc.com
Wed Jun 2 10:47:36 EDT 2021

The magnetometer subsystem has always been specified to require CAT 6a
Shielded Twisted Pair (STP) cable with the shield attached to ground at one
end as a  means to limit the impact of both interference from outside
sources and the potential for radiation of signals from within the system.
Cat 5 cable is not ordinarily suitable.  This is also a requirement for all
intervening connectors.  This point seems to be easily missed.  Suitable
cables connectors, and panel fittings are readily available from Amazon and
other sources.

Dave Witten, KD0EAG

On Wed, 2 Jun 2021 at 08:58, <tangerinesdr-request at lists.tapr.org> wrote:

> ---------- Forwarded message ----------
> From: Ward Silver <hwardsil at gmail.com>
> To: "Dr. Nathaniel A. Frissell Ph.D." <nathaniel.frissell at scranton.edu>
> Cc: TangerineSDR Listserv <tangerinesdr at lists.tapr.org>
> Bcc:
> Date: Wed, 2 Jun 2021 08:50:05 -0500
> Subject: Re: [TangerineSDR] TangerineSDR Digest, Vol 27, Issue 3
> Was the test unit powered by a switching power supply module?  If so,
> replacing it with a linear supply might help.
> In a "production configuration" we should recommend shielded CAT5 or CAT6
> cable with type 31 ferrite beads or cores on each end of the Ethernet
> cable.  If practical, a linear power supply should be used for both the
> magnetometer module and the host SDR.  There are clean switchmode supplies,
> as well, but they would have to be tested.
> If the noise is being radiated directly from the electronics, we'll have
> to tackle that separately.
> 73, Ward N0AX
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