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4.2.6
FurtherOperation
( I ) Operation of ATT.
The receiving antenna catches many kinds of radio wave from the strong one to weak
one. If many strong waves arrive at the high frequency stage of the receiver,
interferences such as intermodulation, blocking, cross-modulation and so on arise, so
that sometimes the desired radio waves cannot be received well. Also, when the partner
station is located very close to your station, the sound is distorted because the AGC
circuit cannot control such a strong radio wave. In such a case, by setting J ,Â1T I to
N,
the receiving condition is greatly improved. If p
meter deflects, the desired
radio wave can be received even though l-AT1-l is set to trt.
Especially, when
receiving the radio wave below 1.6 MHz, it is recommended to always set IATTI
to
@
except at the stand-by condition.
(2) Operation of BC BAND REJECT
While receiving the MHF band (below 3 MHz), many other radio waves may be received
besides the radio wave of the desired station. These are called cross-modulation and
intermodulation interferences due to the strong radio wave of the broadcasting wave
(525 to 1605 kHz). In such a condition, by setting
BC BAND REJECT
switch to
@,
an eliminator filter located at the ANT input circuit operates so as to reject such
interferences, so that the receiving condition will be remarkably improved. When the
desired wave is comparatively strong, use the above-described
IATT-I together with
BC BAND REJECT
(3) Operation of AGC switch
The discharging time constant at the position of AGC tSLôVln is set to 3 sec. so as to
suppress the noise between communications in SSB mode enough for the pleasant
communication. When receiving the radio wave affected by moderate fading, the
ISLOW I position seems to give better result.
However, the weak signal promptly after that the strong signal is received may not be
able to hear since the gain is not recovered yet. Therefbre, when communicating with
the ship at a far distance and the one at a near distance by turns, set the l-ÂGCl switch
to fF-Àsr-].
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