The 15W TV transmitter is composed of three parts, a modulation unit, a power amplifier (PA) unit and a switching power supply. In the modulation unit, video signals are adjusted to the suitable modulation depth via a level adjusting potentiometer and then clamped by a diode. The audio signals are sent to a FM oscillator for frequency modulating after its frequency deviation is adjusted by the level potentiometer. The FM oscillator employs a LC oscillator and generates6.5MHz FM signal by a variable capacitance diode. The frequency of the crystal oscillator is multiplied to generate the wanted visual carrier. 6.5MHz FM signal and video signal modulate the visual carrier simultaneously. A bandpass filter will filter out unwanted components and the signals will be sent to the PA unit by a broadband amplifier.

 PA unit is composed of first stage PA and final stage PA units. The first stage PA unit consists of a module and a transistor and adopts a class-A broadband amplifier. The gain of the module is 34dB and the total gain of the PA is about 54dB. Working current of the triode transistor can be calculated by measuring voltages on both ends of the resistor R6 (2W 1W).

 The power supply unit contains a switching power supply which features small size, lighter weight and high efficiency and can provide over-current and short-circuit protections, so that the transmitter will work at a stable 28V DC voltage. The overall equipment uses one 28V/10A power supplies. In the case of one of the power supplies is out of order, the transmitter will be switched off into safety mode automatically.

Dimensions             120mm*400mm*420

Temperature range                0- 40ºC

Relative humidity                 90% (at 25°C)

Voltage                                 220VAC        50-60Hz  (please let us know your voltage and frequency , we can custom make for you )

Power consumption                     70W

Operating channel                   any appointed channel within UHF or VHF

Modulation method                    Vision: negative polarity, AM

                         Sound: FM

TV standard                         NTSC  ( Pleast let us know the standard you need , we can custom make for you )

Vision/sound power ratio            10:1

Output power                       15W

Output impedance                50W

Unwanted radiation                    in adjacent channel £ -50dB

Intermodulation distortion          in- band £-50dB

Video input voltage                     1Vp-p ± 3dB

Video input impedance        75W

Vision carrier stability          ± 500 Hz/Day

Amplitude vs. Frequency            0-5MHz £ ± 0.5dB

Random spurious S/N          ³50dB

Differential gain                          £ 7%

Differential phase                 £ 5°

Audio input level                 ³100mV

Audio input impedance        unbalanced

Max. frequency deviation           ± 50KHz

Audio harmonic distortion          40Hz – 150Hz £ 2%

FM S/N                             ³60dB

How can you pay to buy the item ?

We recommend you use Paypal to buy our items ,The Paypal is a secure way to buy on internet

www.paypal.com

We recommend you use Paypal to buy our items ,The Paypal is a secure way to buy on internet .

Every of our item list page bottom or top in our website  have a paypal logo to pay.

Our Paypal Account : [email protected]

 

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If you have not a paypal account or difficult to got a paypal accout ,You can use the following: www.moneygram.com

Pay by Money Gram to me :

Full name :Quan Li First name/Given Name: QUAN Last name/ Surname: LI Country: China City: Guangzhou

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www.westernunion.com

Pay by Western Union to me :

Full name :Quan Li First name/Given Name: QUAN Last name/ Surname: LI Country: China City: Guangzhou

 

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Account NO: 6222 0236 0202 5301 078
Beneficiary Name: LI   QUAN
First name/Given Name: QUAN
Last name/ Surname: LI
Bank Name: INDUSTRIAL AND COMMERCIAL BANK OF CHINA
Branch: GUANGZHOU BRANCH
Swift: ICBKCNBJGZU
Address: NO.29,DASHATOU ROAD, GUANGZHOU,CHINA,510100

**When you transfer money to our bank account in Industrial and Commercial Bank of China(ICBC), please do NOT write anything in the remark area due to the foreign currency manipulate policy of chinese government. Thanks!

 

 

 

Account NO:127 854982 833

Beneficiary Name: LI QUAN

Bank Name: THE HONG KONG AND SHANGHAI BANKING CORPORATION LIMITED

Bank Address: 1 QUEEN’S ROAD CENTRAL HONG KONG

Swift code:HSBCHKHHHKH

Bank code:004

**If you transfer money to our bank account in The Hongkong and Shanghai Banking Corporation(HSBC), you can leave message in the remark area without restriction on contents.

 

How do we ship the items to you?

* Articles will be sent within 1-3 working days when payment clear.

* We will send it to  your PayPal address.If you want to change address,please change it before you make payment. Or you can contact us right before the shipping.

* If the packages are below 0.5kg,we will be shipped via airmail, it will take about 15-25days to your hand. If the package is about 1~3kg,we will   ship via EMS,it will take about 7~15days to your hand.If the package more than 3kg , we will send via DHL. It will take about 3~7days to your hand. All the packages are fromm China guangzhou.

* Package will be sent as a “gift” and declear as less as possible,buyer don’t need to pay for “TAX”

*  After shippment, we will send you an E-mail and inform you the tracking number.

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If you have any question, please contact us at:

   [email protected]