Icom IC-211 Instruction Manual page 7

For DC operation:
socket on the rear panel of the IC-211. Refer to the drawing below.
For AC operation
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For DC operation
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ANTENNA
The most important single item that will influence the performance of any communication
system is the antenna. For that reason, a good, high-quality, gain antenna of 50 ohms
impedance is recommended, fixed or mobile. In VHF as well as the low bands, every watt of
ERP makes some difference. Therefore, 10 watts average output plus 3dB of gain antenna
equals 20 watts ERP, presuming low VSWR of course. The few more dollars invested in a
gain type antenna is well worth it. When adjusting your antenna, whether mobile or fixed,
by all means follow the manufacturer's instructions. There are some pitfalls to be aware of.
For example, do not attempt to adjust an antenna for lowest VSWR when using a diode
VSWR meter not engineered for VHF
applications.
Such readings will invariably have an
error of 40% or more.
Instead, use an in-line watt meter similar to the Drake WV-4, Bird
Model 43 or Sierra Model
164B with VHF cartridge.
Further, when adjusting a mobile
antenna, do so with the motor
running preferably above normal
idling speed.
This will
insure proper voltage level to the transceiver.
The RF coaxial connector on the rear chassis mates with a standard PL-259 connector.
Some models may have metric threads. |n any event, the RF connector will mate with
almost any PL-259 connector if care is taken to seat them properly.
EXTERNAL SPEAKER
The IC-211 contains an internal speaker, and is also designed so that it can drive an external
speaker from the external (EXT) speaker jack on the rear panel. Be sure the impedance of
the external speaker is 8 ohms, and remember that with the external speaker connected, the
internal speaker is disabled.