HLLY ELECTRONICS (Hongkong) CO., LTD
The User manual of the 20W FM Transmitter
Thank you for selecting 20W FM RADIO STATION BROADCAST TRANSMITTER
.
HLLY-20W IS FM A STEREO TRANSMITTER which apply PLL technology
，
so it
’
s
transmission is very stable.
HLLY-20W main board adopt the PLL FM Transmitter IC of ROHM (BH1415F)
，
BH1415F build in PLL
、
Audio aggravation and Low Pass filter, The control board is made of
AT89C205 and AT24C02, the HF amplifier is made of 2 2SC3355
、
1 2SC2053 and 1
2SC1972,add up to 4 grade circuit
。
The board adopt HF two layer PCB design
，
and the shell
is made of wonderful aluminum
，
the whole little machine is very beautiful and easy to use!
HLLY-20W is design for amateur Radio fancier and not a professional transmitter!
F
Technical Criteria
：
1.
POWER
：
DC 9-->15V(RECOMMEND 12V)
2.
WORK CURRENT
：
<2.3A
3.
Preset FREQUENCY RANGE
：
88
—
108MHz(Center Frequency:97Mhz)
4.
FREQUENCY STEPPING
：
0.1MHz
5.
FREQUENCY STABLING METHOD
：
PLL
6.
Measure of FREQUENCY Stability
：
LOWER Than 1KHz
7.
MODULATION Mode
：
FM STEREO
8.
Frequency Excursion
：
75KHz
9.
HF Output Power
：
20W
10.
Antenna Impedance
：
50
Ω
11.
Reference transmit range
：
2Km
—
4Km
12.
S/N (stereo)
：
>40db
13.
Stereo Resolution
：
-55dB ( 100 ~ 5000Hz)
；
-45 dB ( 5000Hz ~ 15000Hz)
14.
Frequency Response
：
40KHz~ 15 KHz
±
0.2dB (
立
)
15.
Degree of Distortion
：
<0.3%
16.
Modulation Degree
：
15%
17.
Input Level
：
-15dBV
18.
Machine Weight
：
600g
Machine Size
：
121
×
45
×
154mm
1
Method of Application
1.
Link the 50 Coax cable to the
“
ANT
”
--(BNC Type
）
，
Be sure the link is stable
；
2.
Link the audio input to the
“
Audio
”
--3.5MM Stereo socket
；
3.
Link the DC POWER module to the
“
POWER
”
--6.5mm POWER socket ( DC
12V(current >2A) Pay Attention to the power polar
：
inside positive; outside negative
）。
4.
After electrified,the frequency is the one of last power off
。
5.
Frequency Increase Control
：
pull the button
“
UP
”，
every pull can increase 100KHz
，
pull the button for more than 1 second
，
the stepping jump to 1MHz.
6.
Frequency Decrease Control
：
pull the button
“
DOWN
”，
every pull can decrease 100KHz
，
pull the button for more than 1 second
，
the stepping jump to 1MHz.
S
Using Essential
：
