subject: Panasonic DE-A39 Battery ChargerPanasonic DE-A39 Battery ChargerPanasonic DE-A39 Battery ChargerPanasonic DE-A39 Battery ChargerPanasonic DE-A39 Batte [print this page] Radio technical terms Radio technical terms
To hear the call of all channels, while the use of a listening mode. By pressing the dedicated button, the receiver circuit in a certain order-by-channel receiver for some time to listen to the channel's signal. If each channel receiving time 100ms, the second can be scanned 10 channels, that is, scanning speed 10ch / s.
Priority Channel Scan function (Priority Channel Scan)
During the scanning process priority set priority scan channel.
Will be a channel scan list to remove from or add to the scan list.
Voice-activated (VOX)
When the feature is activated, do not press PTT key, can be launched directly through the voice-activated operation.
Emission limit function (TOT: Time Out Timer)
This feature is used to limit users to launch a channel over time, but also to avoid the radio emission and prolonged damage.
Power saving function (Battery Save)
To save electricity, extend the standby time, no walkie-talkie in a period of time to receive and fired key operation, will be some time off, work the way the boot time, this approach is called power-saving mode. Off the length of time than about 1:4. Upon receiving the signal or key operation, the radio out of sleep mode immediately, enter the normal state.
Select high and low power features (High / Low power)
This feature allows users to choose according to the actual high power or low power.
Banned function (Busy Channel Lockout)
When using this feature, users transmit signals to prohibit the busy channel.
Squelch series (Squelch Level)
Received signal in the noise and signal strength was the strength of correspondence, the stronger the signal noise weaker. The maximum noise and minimum noise divided between the number of files, each file as a. The file is divided into several series called mute. Users can choose according to actual situation.
CTCSS / CDCSS function
Use this feature to avoid receiving irrelevant calls.
2-TONE/DTMF Selective Calling feature
Using 2-TONE or DTMF signaling select the appropriate radio calls.
Scrambler function (Reverse Frequency)
Using back-frequency function, the radio emission frequency and receive frequency will be reversed, and the signaling set were also exchanged.
Offline functionality (Talk Around)
Use the offline feature, the launch of radio frequency and receive frequency becomes the same; fired signaling conversion and receiving signaling is also the same.
Auto Answer feature (Auto-Transpond)
When the radio receives a properly coded call, send a signal to the caller in response to the call.
Emergency Alarm (Emergency Alarm)
Press the dedicated button alarm, intercom with the greatest alarm sound alarm sound or the issue of reservation code to other handset or base station.
Hardline (Patrol Record)
Patrol officers arrived, the patrol point, the radio will receive the registration patrol signal emitted by the query, and then automatically start the registration operation, the identity of its own registration code and other information to the device to be registered on patrol, a patrol officer that has reached the site.
Lock key features (Keylock)
Using the function keys to prevent misuse.
Battery indicator (Battery Indicator)
Show battery power.
Lighting function (Backlight)
For the case at night or dark operate, can look at LCD display and buttons.
Copy function (Cloning)
This feature allows a walkie-talkie in the data copied to the other radio in the same model.
Modulation
Modulated signals with one or a few parameters control the carrier changes the parameters, according to the different control parameters, modulation can be divided into AM, FM and phase modulation.
Audio
Audio, refers to human voice frequencies, usually 300Hz-3400Hz band.
Carrier
Voice, digital signal, signaling the carrier signal, useful, easy-to-high frequency electromagnetic wave transmission. Modulation with a modulation signal one or a few parameters control the carrier changes the parameters, according to the different control parameters, modulation can be divided into AM, FM and phase modulation.
Channel and channel spacing
Transmitting and receiving channels that occupy the frequency values of the time. Adjacent channel is called frequency difference between the channel spacing. Required channel spacing with 25KHz (wideband), 20KHz, 12.5KHz (narrow) and so on.
2-TONE
2-TONE, two-tone signaling, the composition of the two audio signals, A Tone + B Tone. A Tone start time, and time lag, and then send B Tone. Using 2-TONE signaling can choose the appropriate radio calls.
5-TONE
5-TONE, 5 tone signaling, the role of signaling and the two sound the same, difference is formed by the five frequencies.
CTCSS
CTCSS (Continuous Tone Controlled Squelch System), continuous speech control squelch system, called sub-audio, is an audio frequency will be lower than the frequency (67Hz-250.3Hz) attached to the audio signal with the transfer of technology. Its standard audio frequency range below the so called sub-audio. When the radio frequency demodulation of the received signal, the sub-audio signal through filtering, shaping, input to the CPU, and the machine set CTCSS frequency compared to determine whether the mute.
CDCSS
CDCSS (Continuous Digital Controlled Squelch System), a continuous digital control squelch system, its role and CTCSS same, difference is the way it is digitally encoded as a mute is turned on conditions.
DTMF
DTMF (Dual Tone Multi Frequency), dual tone multi-frequency, high frequency group and low groups by the composition of the high frequency group includes four different frequencies. A high frequency signal and a low frequency signal superimposed to form a combined signal, representing a number. There are 16 DTMF signaling code. Using DTMF signaling choose the appropriate radio calls.
