Studio-Transmitter Link System
ZHC658 Digital STL Audio Transmission System
l Functional Overview
ZHC658T/ZHC658R Digital STL Audio Transmission System is aimed at transmitting 2-channel digital audio signals from the studio to the transmitting stations. It adopts the advanced SDR technology, transmitting audio signal with digital encoding & modulating, digital demodulating & decoding, resulting in audio signals to be transmitted over long distances with extremely high quality and virtually no damage.
The transmission distance of the standard Digital STL Audio Transmission System is 40~60km within range of visibility. The transmission system consists of ZHC658T STL transmitter, ZHC658ANT transmitting antenna and ZHC658ANT receiving antenna and ZHC658R STL receiver. See the diagram below:
l Main Technical Parameter
Item | Parameter |
Generals | |
Working frequency | 335MHz~450MHz,adjustable, step size 10KHz |
Frequency accuracy | 2ppm |
Frequency stability | 0.02ppm/24hour, -10℃~+50℃ |
Transmitting power | 2W@Band Shoulder>40dB,RF Spurious products <-80dBc |
Modulation type | 2M@32QAM for 2-channel stereo |
Antenna gain | 12dBi |
Horizontal beamwidth | 140 |
Vertical beamwidth | 300 |
Receiving sensitivity | -85dBm @80dB S/N |
Input/output audio signal | Digital stereo(AES/EBU) |
Working temperature | -10℃~+50℃ |
Audio characteristics | |
S/N ratio | >85dB @1KHz,0dBm |
Distortion | <0.05% @30Hz~15000Hz,0dBm |
Audio freq. response | ±0.1dB @30Hz~15000Hz,0dBm |
Stereo separation | >80dB @30Hz~15000Hz,0dBm |
Power supply | |
Operating Voltage | 90~260VAC |
Power consumption | 50W |
Dual power supply(Optional) | Automatic switching of dual power supply |
Mechanical dimension | |
ZHC658T dimension LxHxW | 445mmx88mmx440mm, 2U, 19” standard rack |
ZHC658T Weight | 11Kg |
ZHC658T Cooling | Forced convection cooling |
ZHC658T Acoustic Noise | <49dB |
ZHC658R dimension LxHxW | 445mmx44mmx440mm, 1U, 19” standard rack |
ZHC658R Weight | 4Kg |
ZHC658R Cooling | Nature cooling |
ZHC658R Acoustic Noise | <30dB |
ZHC658ANT dimension | 1000mmx65mmx10mm |
ZHC658ANT Weight | 5Kg |
Input/Output | |
Digital Audio AES/EBU | -39dBFS~0dBFS,110Ω, XLR |
RF Output connector | N-50KF-C,50Ω |
l Ordering Information(Let us know the frequency and the distance when ordering.)
1. STL transmitter and STL receiver are frequency agility in whole band 335MHz-450MHz.
2. The output filter is ordered according to the working frequency.
3. Transmitting antenna and receiving antenna are ordered according to working frequency (the bandwidth of antenna is 20MHz).
4. The length of the transmitting/receiving cables is ordered according to the distance between the transmitter/receiver to the antenna.
5. If the receiver was interfered by the strong electromagnetic field (for example, there are several big power transmitters working on together in the station), please order the receiving filter (the bandwidth of filter is 20MHz).
Company Show:
Common Problems:
In order to be more comprehensive understanding of the knowledge about our products,we collect all the analyses of problems for every order,hope it will help you.
Q1. What these equipments used for?
A1. We are original manufacturer in FM Radio & TV Broadcasting equipments; they are professional used for FM Radio & TV Broadcasting Station (Transmitting equipment.)
Q2. What equipment & solution your company can provide?
A2. We can do complete solution for FM Radio Station System. It includes:Studio--Link--Transmitter--Cables--Antenna.
We also can provide complete Transmitting part of TV Station. It includes:Link—Transmitter—Cables—Antenna.
Q3. How large areas can One Station cover?
A3. One FM or TV Station can cover one city or one town.
The Maximum cover ranges of one station can not over 100KM Radius because the Earth is Curve.
You can use Multiple Stations & Different Frequency to cover larger area.
Q4. How do I choose suitable equipments for my station?
A4. The most import factors are Power and Frequency.
We need to know the Power and Frequency you need exactly.
How long the distances do you want to cover in Radius?
How height your Antenna can be installed?
Q5. How to calculate Broadcasting equipment Cover Range?
A5. The Cover Range depends on 4 factors:
1. Power from Transmitter; 2. Height of Antenna; 3. Gain from Antenna; 4. Around Environment.
Then we can know the cover range of your station.
Q6. Is the Frequency Adjustable?
A6. FM Radio Band Frequency is 87~108MHz, TV Band Frequency includes UHF/VHF band.
For FM Radio Transmitter; Power Below 2KW is all adjustable. Above 2KW would be narrow.
For TV Transmitter; all Frequency Band is very Narrow, only can contain around 3 Channels; so it’s not adjustable.
Q7. Is your Analog TV Transmitter can be upgraded to Digital?
A7. Yes, we can. But the Frequency Band should be the same.
The only difference between Analog & Digital TV Transmitter is its TV Modulator.
After upgrade to Digital, the Power from TV Transmitter reduced 5 times.
For example: 1KW analog TV Transmitter can be upgraded to 200W Digital TV Transmitter.
Q8. How to do installation of these equipments?
A8. For small power station, the equipments are very easy for installation.
For large power station, we can send our engineer to your country to help you do the installation, but you should pay the cost.
We also can do training for your engineer here in our company.
Q9. How to operate these broadcasting equipments?
A9. We provide All-English user manual; All-English operation software in our equipment.
We also can do training for your engineer here in our company.
Q10. What about after sales?
A10. The warranty time is one year after goods leaving factory.
We can provide technical support from internet or in our company.
We can send spare parts to you directly when the equipment damaged.
CONTACT US:
ZHC(China)Digital Equipment Co.,LTD
ADD: Building 5th, No.23, Jugong Rd. Binjiang District, Hangzhou, China
English Website: http://www.zhcfmtv.com/
Chinese Website: http://www.zhcfm.com/
Name: Mike Cai
Tel: +86-571-8238-1886
Mobile: +86-135-8821-5572 (WhatsApp; Wechat)
Skype: ZHCFMTV
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