Speaker/Microphones; Antenna Considerations - Yaesu FT-470 Operating Manual

Speaker/Microphones
The MH-l 2A2B and MH-:- l 8A2B Speaker/Mies and MH-19A2B Earpiece-
/Mic can be used to increase operating convenience and extend com-
munications range and signal strength. Each is equipped with a dual plug
connector which mates with the EAR and MIC jacks on the top panel of
the transceiver, disabling the internal speaker and microphone. The cable
allows the transceiver to be left clipped to your belt, or to be held
overhead above obstructions for improved performance, if required. For
mobile operation with the MMB-32A Mobile Hanger, the transceiver can
be left in the Hanger during operation.
A Speaker/Mic can be held close to your ear during reception; or an
external earphone can be connected to the transceiver via the Speak-
er/Mic plug, attenuating audio from the speaker in the Speaker/Mic. To
transmit just hold the Speaker/Mic close to your mouth and close the
PT1' switch on the microphone (or on the cord of the MH-19A2B).
Antenna Considerations
While the supplied YHA-28 rubber flex antenna is convenient for
short-range operation, the standard BNC connector allows use of higher
gain antennas for extended range base or mobile operation. However,
any antenna used with the FT-470 must have an impedance close to 50
ohms on the operating frequency(ies). Therefore, for dual band operation,
you have two options:
(a) Use an antenna specifically designed for 2m/70cm operation.
(b) Use two single band antennas, connected through an antenna
duplexer {such as the Yaesu model AD-2) to the transceiver ..
Also, if the antenna is connected with a feedline, use only good quality
50-ohm coaxial cable to avoid losses. To obtain a proper fit with some
BNC plugs, you may need to remove the rubber gasket around the
antenna jack on the transceiver.
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