Adjustment - Kenwood TH-D72A Service Manual

Updating the Firmware
The fi rmware of the main MCU and TNC MCU can be
updated using Firmware Updating Program (s). Update the
fi rmware according to the procedure displayed in updating
program. Refer to the help fi le of the update software for a
detailed procedure.
Download the latest updating program from the follow-
ing URL:
http://www.kenwood.com/i/products/info/amateur/software_download.html
* The URL may change without notice.
Note: Update the fi rmware after replacing the main MCU or
TNC MCU.
Required Test Equipment
1. Stabilized Power Supply
1) The supply voltage can be changed between 3V and 16V
and the current is 1A or more.
2) The standard voltage is 13.8V.
2. DC Ammeter (DC. A)
1) Class 1 ammeter (17 ranges and other features)
2) The full scale can be switched between 300mA and 3A.
3) A cable with low internal loss must be used.
3. Frequency Counter (f. counter)
1) Frequencies of up to 1GHz or so can be measured.
2) The sensitivity can be changed to 250MHz or below and
measurements are highly stable and accurate (about
0.2ppm).
4. Power Meter (terminal type)
1) Measurable frequency: Up to 500MHz
2) Impedance: 50Ω, unbalanced
3) Measuring range: Full scale of 10W
4) The specifi ed special connection cable must be used.
5. RF VTVM (RF V.M)
1) Measurable frequency: Up to 500MHz or so
6. Linear Detector
1) Measurable frequency: Up to 500MHz
2) Characteristic is fl at and CN is 60dB or more.
7. Digital Voltmeter
1) Voltage range: FS = 18V or so
2) Input resistance: 1MΩ or more
8. Oscilloscope
1) Measuring range: DC to 30MHz
2) Provides highly accurate measurements for 5 to 25MHz
9. AF Voltmeter (AF V.M)
1) Measurable frequency: 50Hz to 1MHz
2) Maximum sensitivity: 1mV or more

ADJUSTMENT

10. Spectrum Analyzer
1) Measuring range: DC to 1GHz or more
11. Standard Signal Generator (SSG)
1) Maximum frequency: 500MHz or more
2) Output: –133dBm (0.05µV) to –13dBm (50mV)
3) Output impedance: 50Ω
12. Tracking Generator
1) Center frequency: 50kHz to 200MHz
2) Frequency deviation: ±35MHz
3) Output voltage: 100mV or more
13. Dummy Load
1) 8Ω, 3W or more
Single Tone Transmission
■ Function overview
• This function enables you to transmit a single tone.
■ Example
• It is used to check DTMF deviation during production.
■ Operation
1. Press [PTT] and enter transmission mode.
2. Press [MONI] to enter the single tone mode.
3. Press any of [1] to [8] numeric keys to transmit a single
tone.
■ Details
• The single tone has eight frequencies.
Key
1
2
3
4
• The single tone mode can be enabled only during trans-
mission.
• When the unit returns from transmission mode to re-
ception mode, the single tone mode is canceled. When
transmission mode is set again and a numeric key is
pressed, dual tone (DTMF) is transmitted.
• When [MONI] is pressed again in single tone mode, it
returns to dual to tone mode.
• A dual tone is transmitted during DTMF memory trans-
mission even in the single tone mode.
TH-D72A/D72E
Frequency Key Frequency
697Hz 5 1209Hz
770Hz 6 1336Hz
852Hz 7 1477Hz
941Hz 8 1633Hz
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