Tx Power Output; Tx Deviation - Yaesu FT-7900R Technical Supplement

TX Power Output

1. Press the [ BAND ( SET )] key, then rotate the DIAL knob
to set the display to "B5006". Set the Transmit Power
Level to "LOW" by pressing the [ LOW ( ACC )] key
repeatedly.
2. Press the [ BAND ( SET )] key while pressing and hold-
ing in the [ ( L )] key to set the Alignment parameter
to "A-2 PWR.xxH."
3. Press the PTT switch to activate the transmitter, and
adjust the DIAL knob while pressing and holding in
the [ ( L )] key, if needed, so that the wattmeter read-
ing is 5 Watts (±0.5 Watt).
4. Press the [ LOW ( ACC )] key to increase the Transmit
Power Level to "MID2".
5. Press the PTT switch to activate the transmitter, and
adjust the DIAL knob while pressing and holding in
the [ ( L )] key, if needed, so that the wattmeter read-
ing is 10 Watts (±0.5 Watt).
6. Press the [ LOW ( ACC )] key to increase the Transmit
Power Level to "MID1."
7. Press the PTT switch to activate the transmitter, and
adjust the DIAL knob while pressing and holding in
the [ ( L )] key, if needed, so that the wattmeter read-
ing is 20 Watts (±0.5 Watt).
8. Press the [ LOW ( ACC )] key to increase the Transmit
Power Level to "HIGH."
9. Press the PTT switch to activate the transmitter, and
adjust the DIAL knob while pressing and holding in
the [ ( L )] key, if needed, so that the wattmeter read-
ing is 45 Watts (±0.5 Watt).
10. Press the [ BAND ( SET )] key, then rotate the DIAL knob
to set the display to "B0206". Set the Transmit Power
Level to "LOW" by pressing the [ LOW ( ACC )] key
repeatedly.
11. Press the PTT switch to activate the transmitter, and
adjust the DIAL knob while press and holding the
[ ( L )] key, as needed, so that the wattmeter reading
is 5 Watts (±0.5 Watt).
12. Press the [ LOW ( ACC )] key to increase the Transmit
Power Level to "MID2."
13. Press the PTT switch to activate the transmitter, and
adjust the DIAL knob while pressing and holding in
the [ ( L )] key, if needed, so that the wattmeter read-
ing is 10 Watts (±0.5 Watt).
FT-7900R/E Technical Supplement
14. Press the [ LOW ( ACC )] key to increase the Transmit
Power Level to "MID1."
15. Press the PTT switch to activate the transmitter, and
adjust the DIAL knob while pressing and holding in
the [ ( L )] key, if needed, so that the wattmeter read-
ing is 20 Watts (±0.5 Watt).
16. Press the [ LOW ( ACC )] key to increase the Transmit
Power Level to "HIGH."
17. Press the PTT switch to activate the transmitter, and
adjust the DIAL knob while pressing and holding in
the [ ( L )] key, if needed, so that the wattmeter read-
ing is 50 Watts (±0.5 Watt).

TX Deviation

1. Press the [ BAND ( SET )] key, then rotate the DIAL knob
to set the display to "B5006". Set the Transmit Power
Level to "LOW" by pressing the [ LOW ( ACC )] key
repeatedly.
2. Press the [ BAND ( SET )] key while pressing and hold-
ing in the [ ( L )] key to set the Alignment parameter
to "A-3 DEV.xxH."
3. Inject a 1 kHz audio tone at a level of 80 mV (–20 dBm)
from the Audio Generator.
4. Press the PTT switch to activate the transmitter, and
adjust the DIAL knob while pressing and holding in
the [ ( L )] key, if needed, so that the deviation meter
reading is 4.5 kHz (±0.2 kHz).
5. Press the [ BAND ( SET )] key, then rotate the DIAL knob
to set the display to "B0206". Set the Transmit Power
Level to "LOW" by pressing the [ LOW ( ACC )] key
repeatedly.
6. Press the PTT switch to activate the transmitter, and
adjust the DIAL knob while pressing and holding in
the [ ( L )] key, if needed, so that the deviation meter
reading is 4.5 kHz (±0.2 kHz).
Alignment
E-3