Yaesu FT-2000D, Operating Manual

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Page 18 FT-2000D O
PERATING
M
ANUAL
F
RONT
P
ANEL
C
ONTROLS
& S
WITCHES
IPO
(
I
NTERCEPT
P
OINT
O
PTIMIZATION
)
Switch
This button may be used to set the optimum front end
characteristics of the receiver circuit for a very strong-
signal environment. Available selections are AMP 1
(low distortion amplifier), AMP 2 (2-stage low-distor-
tion RF amplifier), or ON (bypasses the front end RF
amplifier), and the selected receiver RF amplifier ap-
pears at the IPO column of the Receiver Configuration
Indicator in the display.
A
DVICE
:
The IPO switch affects both the Main (VFO-A) and
Sub (VFO-B) receivers.
R.FLT Switch
This button selects the bandwidth for the Main Band
(VFO-A) receiver’s first IF Roofing Filter. Available
selections are 3 kHz, 6 kHz, 15 kHz, or Auto, and the
selected bandwidth appears in the FLT column of the
Receiver Configuration Indicator on the display.
A
DVICE
:
ˆ The Roofing Filter selection applies to the Main
band (VFO-A) only.
ˆ Because the roofing filter is in the first IF, the pro-
tection it provides against interference is quite sig-
nificant. When set to AUTO, the SSB bandwidth is
6 kHz, while CW is 3 kHz and FM/RTTY are 15
kHz. On a crowded SSB band, however, you may
wish to select the 3 kHz filter, for the maximum
possible interference rejection.
AGC Switch
This button selects the AGC characteristics for the re-
ceiver. Available selections are FAST, MID, SLOW,
or AUTO, and the “AGC” icon will change according
to the AGC characteristics selected.
Press the [
AGC
] button repeatedly to select the de-
sired receiver-recovery time constant. Press and hold
in the [
AGC
] button for two seconds to disable the
AGC (for testing or weak-signal reception).
When the [
AGC
] button is pressed independently, it
applies to the Main band (VFO-A) receiver.
When you press the [
B
] button, followed by the [
AGC
]
button (within five seconds of pressing the [ B
] switch),
it affects the Sub band (VFO-B) receiver.
A
DVICE
:
If the AGC receiver-recovery time is set to “
Off Off Off Off Off
” by
pressing and holding in the [ AGC
] button, the S-meter
will no longer deflect. Additionally, you will likely en-
counter distortion on stronger signals, as the IF ampli-
fiers and the following stages are probably being over-
loaded.