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TC-320 Schematic ( PDF Datasheet ) - HYT

Teilenummer TC-320
Beschreibung 2-Way Radio Service Manual
Hersteller HYT
Logo HYT Logo 




Gesamt 30 Seiten
TC-320 Datasheet, Funktion
8130032000100
Free Datasheet http://www.datasheet4u.com/






TC-320 Datasheet, Funktion
TC-320 446MHz Service Manual
Press and hold down the PTT key to transmit, and release it to receive.
SK (Side Key)
Side Key can be programmed with long/short press functions by your dealer. Note: Short Press means
key press no longer than 1 second, and Long Press means key press longer than 1 second.
Channel/Status Indicator
Status indications and alert tones are shown in the table below:
Operations/Functions
LED Indications and Alert Tones
Hold down both SK and Power On/Off Key, and then the
To enter Wired Clone mode
source radio is turned on with red LED flashing once.
Turn on the target radio directly.
Red LED glows during cloning process.
Error occurs during cloning:
a. User Clone: Once cloning begins, frequency band and
Model ID will be checked. LED glows orange for 2
seconds and then goes out to indicate a failed check.
Status of the source radio (After
Wired Clone
target radio is turned on and
cloning cable is connected, press
PTT of source radio to begin
cloning.)
If the check is successfully carried out but error occurs
during cloning, LED will keep flashing orange until you
press any key other than the Power On/Off Key to
cancel it.
b. Factory clone. If error occurs during cloning, LED will
keep flashing orange until you press any key other
than the Power On/Off Key to cancel it.
Once cloning is completed, green LED solidly glows.
Red LED will flash if battery runs low when the radio is in
Clone Mode, while the radio will make no response if battery
runs low during cloning process.
Status of the target radio
Power On (to enter User Mode)
LED solidly glows green when cloning is in progress.
Green LED goes out when cloning is completed.
When the radio is turned on, an alert tone sounds and orange
LED flashes once.
When the radio is currently on a blank channel, it sounds beep
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TC-320 pdf, datenblatt
Circuit Description
1. General Diagram
TC-320 446MHz Service Manual
Tx Section: Audio signal from MIC is sent to the RF chip (U501) directly. In U501, the signal is
amplitude limited and amplified, and then sent to the MCU chip (U601). The baseband signal processing
circuit in U601 will convert the amplified audio signal to digital signal via A/D conversion, and then
convert the digital signal to modulation signal via D/A conversion after processing such as filtering,
signal compression, encryption, pre-emphasis, Tx gain control and amplitude limiting isare completed.
The modulation signal from MCU will pass through the low-pass filter circuit and then will go to VCO for
direct frequency modulation. The modulated carrier signal is converted to RF signal by the buffer
amplifier (U501), and then enters front-stage power amplifier (Q401) for amplification. The amplified RF
signal will be further amplified by the pre-driver (Q402) and final-stage power amplifier (Q403), and then
will enter low-pass filter circuit through the switching diode (D401), and will be finally transmitted via
antenna after ultroharmonics are removed. D402 and D501 compose the Rx-Tx switch circuit.
Rx section: Desired and undesired RF signals received via the antenna are fed to the bandpass filter
(SAWF502) to filter out undesired out-of-band interference signal, and then amplified by the RF amplifier
(U501). The amplified signal is then fed to the bandpass filter (SAWF503) to filter out undesired
out-of-band interference signal. The desired RF signal is mixed with the first local oscillator signal (output
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