Kenwood TM-255E Bedienungsanleitung PDF herunterladen (Seite 40)

7 AUXILIARY FUMCnONS

The functions described in this section are called

"auxiliary" since none of the functions are mandatory

to use in order to contact other stations on any of the

modes. In some cases, only top-of-the-line

equipment used to include some of these functions.

Learning these functions will make operating more

enjoyable for those plagued by difficult operating

conditions, such as man-made interference, or for

those privileged to have a crowded band due to

strong propagation. Some functions improve on the

convenience of an already easy-to-use transceiver by

allowing remote control of frequently-used functions

via the microphone keys.

RECEIVING

RECEIVER INCREMENTAL TUNING (RIT)

RIT provides the ability to vary your receive frequency

by either ±1.1 kHz using 10 Hz steps or ±2.2 kHz

using 20 Hz steps without changing your transmit

frequency. The tuning range is selected via Menu B,

No. 57 {page 14}. The default is ±1.1 kHz. RIT works

equally well with all modulation modes and while

using VFO mode. Memory Recall, or the Call channel.

This function is especially useful while operating SSB

to maintain the best audio when the other station is

drifting in frequency, for example. While operating

CW, combining RIT and IF Shift functions is a quick

way to avoid adjacent frequency interference.

1 Press [RIT].

• "RIT" and the shift frequency value appear.

A VFO

7/ C

Jf CL

n n

LL LI

RIT FM

n n

LI. LI

S 1 3 5 7 9

40dB

4 6

s 10

2 Turn the RIT control to change your receive

frequency.

• As the control is turned, the new frequency shift

updates simultaneously both the RIT display

and the transceiver frequency display in 100 Hz

steps.

3 To switch off the RIT function, press [RIT].

It's a good habit to turn OFF the RIT function after a

contact is finished. This returns the receive frequency

to the transmit frequency. It ensures that you don't

listen by mistake on a different frequency from your

transmit frequency on the next contact. When using

Memory Recall, RIT only functions with a memory

channel containing stored data. Since an empty

channel contains no receive frequency, RIT cannot

function.

IF SHIFT

IF Shift functions only in the SSB or the CW mode.

This allows you to shift the IF filter pass band without

changing the receive frequency.

When the IF pass band is shifted, as shown in the

diagram, it is possible to reduce or completely

eliminate adjacent frequency interference.

Turning IF SHIFT Turning IF SHIFT

counterclockwise clockwise

Interfering

signal

Desired

signal

BIT IF SHIFT RIT -a- IF SHIFT RIT -O" IF SHIFT

Turn the IF SHIFT control clockwise to eliminate an

interfering signal lower than your receive frequency.

This attenuates interference lower in frequency. Turn

the IF SHIFT control counterclockwise to eliminate an

interfering signal higher than your receive frequency.

This attenuates interference higher in frequency.

After using IF Shift, return the control to the center

detent position to select the normal pass band.

NOISE BLANKER

The Noise Blanker was designed to reduce pulse

noise such as that generated by automobile ignitions.

Press [NB] to toggle the Noise Blanker ON or OFF.

• "NB" appears when the function is ON.

• When receiving a strong signal while the Noise

Blanker is ON, receive audio may sound distorted.

This is due to a "pumping" action caused by the

strong signal. If the signal is strong enough to

cause pumping, it is unlikely that the blanker would

be required anyway. Therefore, eliminate this

distortion by switching OFF the Noise Blanker.

ADVANCED INTERCEPT POINT (AlP) FUNCTION

AlP helps eliminate interference and reduce audio

distortion that is sometimes caused by the presence

of strong signals due to the high receiver sensitivity. It

is especially useful during contest-type conditions on

an extremely crowded band or when propagation is at

a peak and all signals seem to be local quality.

Press [AlP] to toggle the AlP function ON or OFF.

• "AlP" appears when the function is ON.

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