12 OPERATOR CONVENIENCES
AUTOMATIC ANTENNA TUNER
As explained in “ANTENNA CONNECTION” {page 1}, matching the impedance of the coaxial cable and antenna is very important. To do this, you have the choice of using the internal or an external tuner. This section describes how to use the internal tuner. For the external tuner, consult the instruction manual that comes with the tuner.
1Select the transmit frequency.
2Press [ANT] to select ANT 1 or ANT 2.
•With an external tuner connected to the ANT 1 connector, you cannot select ANT 1 here. Selecting ANT 1 in this situation always causes the internal tuner to be bypassed.
3Press [AT TUNE] and release it immediately.
•“AT” appears to show that the internal tuner is in- line (not bypassed).
4Press [AT TUNE] for more than one second.
•CW mode is automatically selected and tuning starts.
•“AT” blinks, and “TX” and “CW” appear.
• To cancel tuning for any reason, press |
[ATTUNE]again. |
Note:
◆The internal tuner will not tune outside the authorized transmit limits of Amateur bands.
◆Pressing [AT TUNE] for more than one second while transmitting interrupts transmitting and starts tuning.
◆While using a different antenna tuner band for transmitting and receiving with Menu No. 11 ON, received signals bypass the internal tuner.
◆While using CW Full
◆Tuning will automatically turn off after approximately 60 seconds. In addition, “AT” will disappear and the error beeps will stop.
◆Tuning still may continue when the SWR meter indicates 1:1. This happens because of the tuning algorithm, and does not indicate a malfunction.
◆Even though the SWR meter shows more than one segment, the internal tuner may not function for retuning. This does not indicate a malfunction. It happens because of an unavoidable SWR calculation algorithm error between 10 W (approx.) transmit power for tuning and 100 W transmit power.
◆If tuning does not finish although the SWR meter indicates smaller than 3:1, adjust the antenna system to lower the SWR, then retry tuning.
◆Tuning may not lower the SWR to 1:1 depending on conditions.
PRESETTING
After each successful tuning session, the Preset function stores the position of the tuning capacitor in memory. The position of the capacitor is stored for each of the antenna tuner bands (see table below) and for each antenna connector (ANT 1 and ANT 2).
Press [AT TUNE] and release it immediately.
•“AT” will appear to show that the internal tuner is in- line (not bypassed).
•Each time you go across the antenna tuner band, the Preset function automatically positions the tuning capacitor without need for retuning. If no Preset data exists for a particular band/antenna combination, then the default data for 50 Ω is used.
Note: Tuning may restart to obtain the optimum matching condition although the current antenna tuner band has the preset data. This does not indicate a malfunction.
• If the SWR of the antenna system is extremely |
high, an alarm, Morse code “SWR”, is output and |
the internal tuner is bypassed. Before retrying |
tuning, adjust the antenna system to lower the |
SWR. |
5See the display and check that tuning has successfully finished.
•After successful tuning, “AT” stops blinking, and “TX” and “CW” disappear.
•If tuning does not finish within about 20 seconds, an alarm sounds. Press [AT TUNE] to stop the alarm and tuning.
If you access Menu No. 11 and select ON, received signals will also pass through the internal tuner. This may reduce interference to the receive frequency.
Frequency Range
(MHz)
0.03~ 1.85
1.85~ 2.50
2.50~ 3.525
3.525 ~ 3.575
3.575 ~ 3.725
3.725 ~ 4.10
4.10~ 7.03
7.03~ 7.10
7.10~ 7.50
7.50~ 10.50
10.50~ 14.10
Frequency Range
(MHz)
14.10~ 14.50
14.50~ 18.50
18.50~ 21.15
21.15~ 21.50
21.50~ 25.50
25.50~ 29.00
29.00~ 30.00
30.00~ 51.001
51.00 ~ 52.001
52.00 ~ 53.001
53.00 ~ 60.001
52