- ページ 12

アンプ Acom 1010のPDF 取扱説明書をオンラインで閲覧またはダウンロードできます。Acom 1010 20 ページ。 External radio frequency power amplifier
Acom 1010 にも：回路図ドキュメント (14 ページ), 回路図 (15 ページ)

ページを印刷する

4-3. RTTY Mode

Select the RTTY mode to operate continuous-duty modes such as RTTY, SSTV, or other data modes. The

LED indicator above the RTTY button illuminates and the amplifier operating parameters are changed

to reduce tube dissipation. In the RTTY mode, the amplifier output power is reduced to a maximum

of 500 W. There is no need to adjust tuning when changing between RTTY and normal modes.

To avoid damage not covered under warranty, do not change modes during

transmission. That is, do not change to or from RTTY or any other mode when

transmitting.

4-4. Antenna change

By pressing the A1-A2 button, the amplifier output is switched between the two corresponding antenna

outputs, ANT1 and ANT2. The lights above the button indicate the current antenna selection.

To avoid damage (not covered under warranty) do not change the antenna during

transmission.

4-5. Tuning

Tuning is possible only in the OPER mode.

a) Preliminary information.

Tuning the amplifier involves a procedure of matching the impedance of the antenna and transmission

line to the amplifier tube's characteristic load resistance. This will ensure maximum plate efficiency and

RF gain at nominal output power, with minimal distortion and spurious output. Note that REFLECTED

POWER readings depend on the antenna and transmission line impedances only, and not on amplifier

tuning. If the load impedance is not a nominally resistive 50-Ohms, the REFLECTED POWER reading will

always show a reading, no matter what the tuning settings. Proper tuning is always necessary, however,

and will allow you to operate at a high power level, without distortion or any danger to the amplifier.

Note also that the real OUTPUT POWER presented to the load (the antenna and transmission line)

is equal to the difference between the FORWARD and REFLECTED power readings. For instance,

with a 2.5:1 VSWR, readings of 800 W and 150 W FORWARD POWER and REFLECTED POWER

respectively, the real OUTPUT POWER is 650 W. At very high VSWR levels, such as when no antenna

is connected or a badly mismatched antenna is used, the FORWARD and REFLECTED readings will

be almost equal, while the real OUTPUT POWER (the difference between them) will be nearly zero.

The amplifier can operate safely as long as the REFLECTED POWER is LESS THAN 250 W. Matching

is assured for loads presenting a VSWR of up to 3:1. Nevertheless, for some loads and bands, matching is

possible at even higher VSWR levels, but the drive power must be reduced to prevent the REFLECTED

POWER from exceeding 250W. Failure to comply with these guidelines will cause the protection circuits

to trip. For example, if the antenna VSWR were 5:1, the maximum attainable forward power would be

540 W, 240 W of reflected power and real output to the antenna and transmission line of only 300 W.

In the event your antenna cannot be adjusted to produce a lower VSWR, an external antenna tuner may

be deployed.

CAUTION