FT-2000
Operating Manual
Vertex Standard Co., Ltd.
50
This setting ensures that excessive gain is not being utilized, without so much gain
reduction that incoming signals cannot be heard.
Quick Point: The RF Gain control, along with the IPO and Attenuator features, all
affect the system receiver gain in different ways. As a first step in dealing with high
noise or a crowded, high-level signal environment, the IPO generally should be the first
feature engaged, if the frequency is low enough to allow the preamplifier to be
bypassed. Thereafter, the RF Gain and Attenuator features may be employed to
provide precise, delicate adjustment of the receiver gain so as to optimize performance
fully.
Advanced Interference-Suppression Features: RF Front End
The FT-2000 includes an unmatched array of RF selectivity-enhancing features. Please
study the material below carefully, so as to understand the various features completely.
Using the VRF (Variable RF Front-end Filter)
The VRF system is a high-performance RF front-end preselector that has high Q factor
and lower insertion loss. VRF provides outstanding rejection of out-of-band signals,
and if low gain in your antenna system causes insertion loss to be a critical factor, you
may wish to use VRF.
1. Press the [VRF] button momentarily. “VRF” icon will appear at the FLT column of
the Receiver Configuration Indicator on the display, and the VRF system will be
engaged, centered on your current Amateur band.
2. You may rotate the [VRF] knob to skew the position of the VRF system relative to
your operating frequency. Because the VRF system is relatively broad, although
still much narrower than the fixed bandpass filter), you may not hear much
difference in the background noise or signal quality when you make minor
adjustments. However, if you have receiving problems associated by a very strong
signal, rotation of the [VRF] knob may help reduce the strength of the interfering
station, allowing improved reception of the desired signal.
After moving the passband of the VRF system manually, you may re-center it
on the current Amateur band by pressing and holding in the [VRF] button for
two seconds.
3. To switch VRF off, press the [VRF] button until the “VRF” icon will change to
“THRU” at the FLT column of the Receiver Configuration Indicator on the display,
and the VRF circuit will be removed from the incoming received signal path.
