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Date Posted by Category User IP

2016-01-16 (UTC)

VE3OP

Filters

179.43.176.130

Yaesu MTU-30/20 Outboard Filter

The Ultimate Low-Band DXer RF
pre-selection Filter: Yaesu's
exclusive µ-Tuning (MTU) system.

MTU-30/20. $385 firm
(new price is currently $540 to
$600 each). Will ship from NY
state for $16. Is in
excellent like-new condition.
Never used. From a non-smoking,
well cared for environment. I
donít have a radio that works
anymore with them, hence my
reason for selling.

On the lower Amateur bands, the
signal voltages impinging on a
receiver can create noise and
Inter-modulation effects that can
cover up weak signals that youíre
trying to pull through. So Yaesu
engineers developed the µ (Mu)
Tuning system that work with the
FT-2000, FT-3000, FT-5000, and
the FT-9000.

These modules may be connected
externally with no internal
modification required, When µ-
tuning is engaged, the standard
VRF (Variable RF Preselector)
system is bypassed, but the fixed
bandpass Filters are still in the
received signal path. The µ-
Tuning filters utilize a stack of
large 1.1Ē (28 mm) Ni-Zn ferrite
cores, driven through a silver-
plated coil assembly by a
precision stepper motor. The
resulting high Q (typically over
300) provides a very steep
resonance peak near your
operating frequency. The peak may
be adjusted away from your
frequency, for even greater
protection from a specific
station, and a graphical
depiction of the µ-Tune filter
alignment appears on the front
panel of the transceiver.

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