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Yaesu FT-817ND Manual

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25FT-817ND Operating Manual
AGC
(
AUTOMATIC GAIN CONTROL
)
The receiver recovery time constant of the AGC system may be modified to match your
operating needs.
1. Press the key momentarily, then rotate the knob, as needed, until Operating
Function Row 8
[
NB, AGC
]
appears on the display.
2. Press the
(
AGC
)
key to toggle the AGC recovery time constant among the follow-
ing selections:
“AGCauto” “AGCfast” “AGCslow” “AGCoff” “AGCauto” ……
where “AGCauto” represents “AGCfast” on CW and DIG(AFSK), and “AGCslow” on
the voice modes.
If “AGCoff” selected, the S-meter (which monitors AGC voltage) will cease to func-
tion.
NOISE BLANKER
The IF Noise Blanker may be useful in reducing or eliminating some types of impulse
noise, especially noise generated by automotive ignition systems.
1. Press the key momentarily, then rotate the knob, as needed, until Operating
Function Row 8
[
NB, AGC
]
appears on the display.
2. Press the
(
NB
)
key to activate the Noise Blanker. The “” icon will appear at the
right of the “NB” indication.
3. Press the
(
NB
)
key again to turn the Noise Blanker off.
IPO
(
INTERCEPT POINT OPTIMIZATION
)
The IPO feature bypasses the receiver RF preamplifier, thereby eliminating the preamp’s
gain. This feature is not available on the 144 MHz and 430 MHz.
1. Press the key momentarily, then rotate the knob, as needed, until Operating
Function Row 7
[
IPO, ATT, NAR
]
appears on the display.
2. Press the
(
IPO
)
key to bypass the receiver input preamplifier. The “” icon will
appear at the right of the “IPO” indication.
3. Press the
(
IPO
)
key once more to re-activate the preamp.
On the bands below 14 MHz, the input preamplifier is rarely necessary, and acti-
vation of the IPO feature will provide substantial protection against intermodulation
and other problems associated with strong signal input to the receiver. Rule of thumb: so
long as the S-meter is moving on background noise, additional front-end gain is not
necessary.
RECEIVER ACCESSORIES
… 27 …


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