Kenwood TH-D72A Service Manual

Also see for TH-D72A: Instruction manual User manual Instruction manual Instruction manual Instruction manual

Contents

TH-D72A/D72E39Updating the FirmwareThe firmware of the main MCU and TNC MCU can beupdated using Firmware Updating Program (s). Update thefirmware according to the procedure displayed in updatingprogram. Refer to the help file of the update software for adetailed 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 orTNC MCU.Required Test Equipment1. Stabilized Power Supply1) The supply voltage can be changed between 3V and 16Vand 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 andmeasurements are highly stable and accurate (about0.2ppm).4. Power Meter (terminal type)1) Measurable frequency: Up to 500MHz2) Impedance: 50Ω, unbalanced3) Measuring range: Full scale of 10W4) The specified special connection cable must be used.5. RF VTVM (RF V.M)1) Measurable frequency: Up to 500MHz or so6. Linear Detector1) Measurable frequency: Up to 500MHz2) Characteristic is flat and CN is 60dB or more.7. Digital Voltmeter1) Voltage range: FS = 18V or so2) Input resistance: 1MΩ or more8. Oscilloscope1) Measuring range: DC to 30MHz2) Provides highly accurate measurements for 5 to 25MHz9. AF Voltmeter (AF V.M)1) Measurable frequency: 50Hz to 1MHz2) Maximum sensitivity: 1mV or more10. Spectrum Analyzer1) Measuring range: DC to 1GHz or more11. Standard Signal Generator (SSG)1) Maximum frequency: 500MHz or more2) Output: –133dBm (0.05μV) to –13dBm (50mV)3) Output impedance: 50Ω12. Tracking Generator1) Center frequency: 50kHz to 200MHz2) Frequency deviation: ±35MHz3) Output voltage: 100mV or more13. Dummy Load1) 8Ω, 3W or moreSingle Tone Transmission■ Function overview• This function enables you to transmit a single tone.■ Example• It is used to check DTMF deviation during production.■ Operation1. 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 singletone.■ Details• The single tone has eight frequencies.Key Frequency Key Frequency1 697Hz 5 1209Hz2 770Hz 6 1336Hz3 852Hz 7 1477Hz4 941Hz 8 1633Hz• 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. Whentransmission mode is set again and a numeric key ispressed, dual tone (DTMF) is transmitted.• When [MONI] is pressed again in single tone mode, itreturns to dual to tone mode.• A dual tone is transmitted during DTMF memory trans-mission even in the single tone mode.ADJUSTMENT