ADVANCED INTERFERENCE-SUPPRESSION FEATURES:RFFRONT END

The FT-2000includes 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 low insertion loss. VRF provides outstanding rejection of out-of-band signals, and can significantly improve reception in tough co-location operations such as a contest or DX-pedition. The FT-2000’s VRF system affects the 1.8 - 28 MHz amateur bands only.

1.Press the [VRF] button momentarily. The “” icon will appear at the FLT column of the Receiver Con-

figuration Indicator on the display, and the VRF system will be e n g a g e d , 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 if

overload was degrading reception.

ADVICE:

￿ You may observe the relative skew of the VRF system in the Tuning Offset Indicator on the display while turning the [VRF] knob.

￿After moving the passband of the VRF system manually, you may re-center it on the current Ama- teur band by pressing and holding in the [VRF] button for two seconds.

3.To switch VRF off, press the [VRF] button until the “” icon shows “” in the FLT column of the Receiver Configuration Indicator on the display; this confirms that the VRF circuit has been removed from the incoming received signal path.

Receiver Configuration Indicator

[VRF] Button

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Offset Tuning Indicator

[VRF] Knob

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ADVICE:

￿The VRF filter affects both the Main (VFO-A) and Sub (VFO-B) bands.

￿The VRF Filter operational status will be memorized independently on each VFO in the VFO stack.

QUICK POINT:

The VRF filter, utilizing high-quality coils and capacitors that provide high Q, yields a passband that is approximately 20% to 30% the width of a traditional, fixed bandpass fil- ter. As a result, significantly more “unwanted” signal rejection is provided. Within each Amateur band, the following adjustment steps are provided, if you wish to skew the response in a particular direction so as to enhance interference rejection even more. The actual “sound” of the signal you are listening to will remain unchanged, how- ever.

AMATEUR BAND

VRF ADJUSTMENT STEPS

1.8 MHz

62 steps

3.5 MHz

62 steps

5 MHz

62 steps

7 MHz

62 steps

10 MHz

30 steps

14 MHz

30 steps

18 MHz

20 steps

21 MHz

20 steps

24.5 MHz

20 steps

28 MHz

20 steps

FT-2000 OPERATING MANUAL

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