Bedienungsanleitung Kenwood TS-870S (Seite 44 von 104) (Englisch)

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AGC AUTO

FM TRANSMISSION

FM operation on HF frequencies solves the problem of

how to have long distance voice communication with

the finest audio quality. When combined with the

full-quieting aspect of FM signals that suppress

background noise on the frequency, FM can be the best

method for maintaining regular schedules with friends.

And when conditions are unusually good allowing

simplex FM contacts over intercontinental paths, you

may feel as though you are using your local VHF

repeater to talk across town instead of using the HF

spectrum for multi-hop communication.

Refer, if necessary, to “OPERATING BASICS”

beginning on page 19 for complete receiving details for

any mode.

Note:

Switch ON Menu No. 12 (FM.S-MET) if you prefer. This

function applies a correction for the S-meter when operating on FM.

This correction will adjust S-meter readings to be equal with other

KENWOOD

HF transceivers.

1 Select the operating frequency.

2 Press [FM/AM] to select FM mode.

3 Press [MONI] to switch the Monitor function ON.

•“MONI” lights.

4 Press and hold down the Microphone [PTT] switch,

or press [SEND].

• The “ON AIR” indicator lights.

• Refer to “VOX” {page 45} for information on

automatic TX/RX switching.

5 Speak into the microphone.

• FM microphone gain can be switched between

low (L) or high (H) via Menu No. 61 (FM MIC).

The default is low (L). Low is usually appropriate;

however, select high if the monitored audio or

reports from other stations indicate that your

audio is weak. The Front Panel MIC gain control

has no affect in the FM mode.

• Speak in a normal tone and level of voice.

Speaking too close to the microphone, or too

loudly, may increase distortion and reduce

intelligibility.

• The CAR control does not need to be adjusted

since the carrier level is fixed at the best setting

for the FM mode.

6 Release the Microphone [PTT] switch, or press

[SEND] again, to return to the receive mode.

• The “ON AIR” indicator goes out.

Note:

◆

When using the optional MC-90 in FM mode, the microphone

sensitivity is low, and this may cause insufficient modulation. Use

Menu No. 61 to select high microphone gain.

◆

When the target station is using FM wide-band deviation, you

also must select wide-band deviation (Menu No. 60). If you

transmit using the narrow band against this rule, the target station

will receive your audio less clearly.

6 COMMUNICATING

FM REPEATER OPERATION

Compared to the usual simplex method of FM

communications on HF, which is radio to radio with

antennas at or slightly above average terrain, you can

often transmit much farther through repeaters.

Repeaters are typically located on a mountain top or

other elevated location. Most often they operate at a

higher ERP (Effective Radiated Power) than the

average mobile or fixed amateur station. This

combination of elevation and high ERP allows

communications over wider and longer distances than

can be achieved by the average station.

HF repeaters operate only in the 29 MHz FM sub-band.

This special service combines the advantages of FM

operation, good fidelity with noise and interference

immunity, with the excitement of HF DX (long distance)

communications. Even on a quiet day, 10 meter FM

provides reliable around-town communications with the

potential for sudden DX from across the country or

around the world.

Note:

Switch ON Menu No. 12 (FM.S-MET) if you prefer. This

function applies a correction for the S-meter when operating on FM.

This correction will adjust S-meter readings to be equal with other

KENWOOD

HF transceivers.

1 Press [RX B] (or [RX A]).

• The VFO selected in this step will be used for the

transmit frequency.

2 Select the transmit frequency.

3 Press [FM/AM] to select FM mode.

4 Press [A=B].

5 Press [RX A] (or [RX B]).

• This must be the VFO that was not selected in

Step 1.

29.520 MHz

88.5 Hz

29.520 MHz

88.5 Hz

29.620 MHz

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Kenwood TS-870S Seite 44

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