Italy EKA PLL/CST-3 250W LCD FM Transmitter–FMUSER
Italy EKA PLL/CST-3 250W LCD FM Transmitter
Phase-locked loop is a band FM transmitter 87.6-107.9MHZ lock .
In order to be compatible with any audio signal , the device provides four inputs.
Respectively input single multiplexed channel and right channel , the left channel composite signal multiplexed together and attached to two input signals .
Mono input includes a low pass filter , leaving the 20K-100KHZ signal attenuation than 15KHZ 30dB.
A threshold circuit for all input signal acts to prevent the maximum deviation is more than ± 75KHZ.
Phase-locked loop using a set of micro stepper controller 10K-100KHZ ‘s .
In addition to the frequency , but also does not allow the detection of a band set , the display frequency and the management and protection of the power end stage comprises a transistor amplifier, a power conditioner can reach 250W.
Rack , 3U high equipment designed to “19” in the rack , it can be removed to ensure that the internal structure of the panel , in order to accommodate the main power supply can select 220V or 110V.
Settings: If you need to provide the transmitter with stereo encoder .
1.2 Technical Specifications
RF output power of 5-250W
Output Interface N head
Output impedance 50Ω
Frequency range 87.6-107.9MHZ
Frequency programming step 10/100KHZ
Frequency error + /-500HZ
Modulation FM modulation
Harmonic Suppression meet or exceed FCC and CCIR standards
Modulation ability to meet or exceed FCC and CCIR standards
AM -fold induction noise ratio 60dB or better
Synchronous AM noise ratio of 50 dB or times better
General AC 220V ± 15% 50/60HZ
Power consumption 480VA
An area the size of 19 “x3U
Temperature -10-45 ℃
Sound pre-emphasis 50us (75us)
Complex operation ( stereo ) composite inputs 4 mono stereo , two additional channels
Composite signal input unbalanced BNC connectors
Composite signal input impedance 10KΩ
Composite signal input level 0dB (w)
SNR 68dB ( heavier ) 71 dB ( un-weighted )
Composite amplitude response <0.3 dB 30HZ-76KHZ
Harmonic distortion <0.2 dB
Intermodulation Distortion > 60dB
Isolation > 40 dB (30HZ-18HZ)
Additional 2-way unbalanced signal input
Additional input impedance 10KΩ
Additional input level 0 dBm
Additional input amplitude response of + / -0.5 dB 40KHz-100KHz
Mono Audio Input impedance 60Ω Operation balanced or unbalanced
Audio SNR 0dBm
FM signal to noise ratio > 74dB ( heavier )
Frequency response + /-0.5dB, 30HZ-15KHz
Total harmonic distortion <0.2dB
Intermodulation Distortion > 60dB
At the transmitter front panel has an LCD display device parameters, and four keys for parameter setting , set the transmit frequency and switching stereo encoder .
When you turn on the transmitter displays the following information :
Details , F2 and F3 to select the display transmitted and reflected power , emission frequency , device type, product name, and the left and right channel audio voltage.
F1 and F4 keys can be programmed mode , the operation is described as follows :
In order to change the transmission frequency to enter the programming mode, press the F1 and F4 to
Use F2 or F3 button to select “Output frequency ” option and confirm pressing F4. With F2 and F3 keys to set the new frequency.
Exit programming module , press F4 to make new settings, press the F1 key does not keep quit. To open or close the stereo module, then press F1 and F4 keys , then use the F2 or F3 to select ” Stereo Module” option. Confirm press F4.
“Open Stereo Module” or “off the stereo module ” with F2 or F3 to select , then press F4 to confirm. If the machine does not sound modules, this setting is invalid.
Under abnormal operating conditions , the same warning message is displayed , the details of the second line of the display :
1 . ” Transmit Power alarm ” in the case of output power greater than 250W
2 . ” Reflected Power Alarm” in the case of the reflected power greater than 30W
3 . ” Phase-Locked Loop failure alarm ” Should the loop failure
Simultaneously displaying the above information , the following situations:
1 . The maximum output power is limited to 250W
2 . Reflectivity will recognize the reflected power limit does not exceed 30W
3 . Work RF output module is inhibited
In the case of temperature alarm , “Temperature Alarm” LED will light up , the final stage will be suppressed.
EDITED BY FMUSER