Bedienungsanleitung Kenwood TS-870S (Seite 85 von 104) (Englisch)

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APPENDICES ●

that different signal and band conditions can produce

different results. Try not to come to any conclusions

about which settings are best at this early stage. Keep

an open mind until you’ve done a lot more

experimenting on various bands with different

propagation conditions.

Widen the receive pass band by turning the LO/WIDTH

control counterclockwise and the HI/SHIFT control

clockwise. Try to find a QSO in progress between two

stations who are experiencing interference from a third

station that may be tuning slightly off frequency but

within your pass band. Press [BEAT CANCEL]. You

may think the tuning station stopped transmitting. Press

[BEAT CANCEL] again to switch OFF the function.

The station is still tuning and you can hear it again!

Beat Cancel can be so effective at automatically finding

and canceling tones that are audible in the pass band

that you may not be aware of the “interfering” stations at

all. With Beat Cancel ON, experiment by changing the

Beat Cancel response time via Menu No. 16. The

response time of the function decreases as the setting

number increases (selection 0 has the fastest response

time).

Press [AUTO NOTCH]. Since Auto Notch functions in

the IF stages, it may work better or worse than Beat

Cancel for a given situation. Compare the effect of Auto

Notch versus Beat Cancel with the same interfering

tone or tones. Change Menu No. 17 to try different

response times for Auto Notch while that function is

activated. Experiment and listen.

If you are a CW operator, switch to the CW section of a

band and search for a crowded portion. With the CW

mode selected and the LO/WIDTH control turned

clockwise to select a 1 kHz bandwidth, tune to a

frequency where two or more stations are audible. Now

turn the LO/WIDTH control counterclockwise to reduce

the bandwidth. Forget old ideas associated with analog

filters for how narrow you like the bandwidth when

operating CW. With the minimum bandwidth, you may

need to tune a little to center the desired signal in the

pass band. Press [FINE] to reduce the tuning step to

make tuning easier. Listen to the quality of the chosen

signal. Can you believe the bandwidth displayed on the

Front Panel? There are other functions to help you fight

CW interference (such as IF Shift) but this example is to

illustrate the benefits that DSP offers when using

extremely narrow bandwidths.

After reading this manual, you should be equipped with

the basic knowledge to begin learning how to use DSP

to your advantage. The DSP benefits that you enjoy will

be related to the amount of time that you spend

experimenting with DSP while operating.

APPENDIX A: LEARNING ABOUT DSP

First-time users of a DSP transceiver may feel

bewildered by the quantity of functions that they have

never encountered on previous transceivers. When

combined with the collection of new terminology that

accompanies DSP, even an experienced operator may

become frustrated. The purpose of this section is to

offer a few examples that help you to begin learning

about the effects and benefits of DSP. It’s best to read

this section after you are comfortable with using the

Menu system, and after you are fully familiar with the

controls and buttons on the TS-870S. This manual will

not make you an expert on using the DSP functions;

that knowledge will come as a result of hands-on

experience with the TS-870S.

Regardless what style of operating you prefer, DSP can

help you. What operator doesn’t want the quiet,

low-noise pass band offered by DSP operating in the IF

stages? Who doesn’t want to effortlessly eliminate

interfering tones caused by others tuning up near their

operating frequency? Why wouldn’t anybody want to

narrow their CW bandwidth to a razor-thin slice of

spectrum if they can still listen to a pleasing CW note

without analog filter “ringing”? These are only a few

examples where DSP shines.

To begin with, the default Menu values chosen for the

DSP functions on the TS-870S Menu have been

carefully considered by the design engineers. They are

good starting points. If you have already changed many

Menu items as you’ve experimented with your new

transceiver, do a Temporary Menu Reset {page 24} or a

Full Reset {page 63} so that you know you are starting

with the default Menu values.

Switch over to an Amateur band with lots of activity.

Tune in an SSB station with reasonable signal strength.

Press [N.R.] to activate Noise Reduction. You will hear

a drop in the background noise that makes listening to

the signal much more pleasant. If your station is

located in an electrically noisy city, this function alone

may make you a DSP believer. Assuming the default

Menu values are selected (due to the reset above), you

are now using the Line Enhance function (Menu No. 13

is ON). This function is “tracking” (Menu No. 18 is ON)

the signal as the unwanted noise is removed.

Try changing Menu No. 14 to reduce and increase the

response time of the Line Enhance function. What do

you notice? Maybe little change can be heard with this

signal or maybe you hear an important change. The

longer you allow DSP to monitor the signal, the better

the adaptive filters can determine how to fight the noise

that is present. But there are tradeoffs. Monitoring a

particular signal for too long will mean that the

transceiver responds too slowly. Experiment and listen.

Switch OFF Menu No. 13. You are now using the SPAC

filter. Listen for a change in audio quality as you switch

Menu No. 13 OFF and ON. While Menu No. 13 is OFF,

change the setting for Menu No. 15 to select a different

correlation time for the SPAC mode. If you can’t hear a

significant difference for the current receiving situation,

then select a longer SPAC time for better audio quality.

Although you may prefer the audio produced when, for

example, the Line Enhance function is ON, remember

Kenwood TS-870S Seite 85

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