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7 Watt FM Transmitter Specifications

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This unit includes all the components and circuit boards fully tested and assembled inside an acrylic box. Other items  include a 12 volt, 2/3A SMPS power supply with DC pin,8GB SD card with songs card, BNC connector,antenna key items & audio cable .

The  7W FM transmitter has a control panel with a dot matrix LCD display screen and  3 key buttons to change frequency,volume and range by changing the output transmitting power.
Control panel: 58 x 36 mm (as shown in the picture)

The range / distance: more than 10 km on GP antenna (when premise is in open field emission) or 15 KMs with a home made Yagi antenna as per sample Yagi antenna design  given in the picture to fabricate at home. Other designs for getting 25 KMs are supplied on purchase. Please note  GP antenna is optional at extra cost.

Transmitter  key features:
1, Digital technology, make the frequency more stable, the frequency does not change with the environment and produce frequency drift.
 No need for any adjustment inside.
2, But the frequency can be adjusted gigitally by buttons within the specified scope.
3, Has a micro sd socket to use any 8GB card  (Card supplied at no extra cost) holding 100's of old MP3 hindi cinema songs and one can add more 6000 songs from any computer through the SD card adaptor supplied.No need to use any external audio feed into the aux socket. 

4, Also with microphone input interface, and  through digital potentiometer  it is easy to control the volume of the microphone (supplied at extra optional).
5, Audio input ay aux also by digital potentiometer to  adjust the volume.
6, Transmitting Power can be changed between 0.5 W and 7 W maximum having continuous adjustments features to adjust the range from 100 meters to 15 KMs.
7, The power output network for harmonic suppression is very good, so as to make the output spectrum more clean.
8, Set the frequency and  power once and the next time  boot does not need to do the set up again!

Main parameters:
1, The input voltage: dc 12 v
2, Maximum input current 1.5 A at 12 v DC
3, The audio signal: the maximum input Vpp is less than 1 v.
4, Microphone types accepted: Any
cylindrical microphone or condenser microphones.

5, The output power: 0.5 W - 7 W continuously adjustable!
6, The output impedance: 50 Ω for antenna 
7, Working frequency range: 76 m - 108 MHZ
8, Frequency step of 0.1 MHz for adjusting
9, The distortion degree: 0.03% ~ 0.1%
Read comments- Even if using a badly hand made antenna this user-+91 96182 76844, comments "It's working superb Quality sound" in 3 KMs range


How far (long) the transmitter will cover?

The transmission range depends on many factors. The true distance is based on the antenna installing height , antenna gain, using at  environment facing buildings and other obstructions , sensitivity of the receiver and antenna of the receiver . Installing the antenna at higher height and using in away from cities, the distance will much more longer.

EXAMPLE:- 7W FM Transmitter used in the city and village with GP  vs Yagi antenna:

I have many customers in India who use our this 7W FM stereo transmitter with a home built GP antenna  and they have tested it with a car FM radio (not cell phone FM radio) and, it covers a range of 10 kms radius in a city area with clear sound and no hissing noise.  The distance can be more than 15KMs while using a homemade directional Yagi antenna.Upon their request I have removed their mobile numbers as they were getting several calls a day.

Most Important
Antenna either Yagi or GP (ground plane) must be used in this transmitter with 50 ohms coaxial cable RG58( Used by cable tv operators). Cable is to be procured at your end. GP antenna is available at extra cost

Package includes :

  (1 )7 W FM stereo FM transmitter in a white acrylic box with LCD Screen on top having 3 button switches for adjustment.
 (2) One 12 volt  2/3 A, SMPS DC supply adaptor for 100 to 240 volt 50/60 Hz ac input ,with DC output pin.(Adaptor may not be same as shown in picture)
 (3) One aux cord
 (4) One/two BNC connector for antenna cable connection
 (5) One 8GB Sd card with many songs
 (6) One SD card adaptor for loading more songs              from any laptop.
  (7) (Optional ) complete GP antenna at Rs 1510/-with base, one vertical standing and 3 hanging telescopic antennas.
(8) (Optional )  RG58 Coaxial cable coil at Rs 3500/- extra

Leave a reply
Optional, for replies


peddi Sambasivarao - 11-05-2017

Thank you sir, I will consider to put an order after discussing with my partner and registration procedures. Sambasivarao

hafiz hussain - 25-02-2017

hello, i am a student for making the project as long distance walky talky for country to country communication pls help me for doing this project with the help u because rf can be possible for long distance communication with high power hence i ask the help. my contact mail id

admin - 26-02-2017


admin - 26-02-2017


admin - 26-02-2017


Charles Sande - 04-04-2017

How much will it cost me to have 10 to 15 kms range? I'm Mr. Charles Sande from Kenya, I need to have one. Phone +254 721 320 430, email: charlysande@yahoo,com

admin - 28-08-2017

If you are still interested you can buy online. The postage will be extra which will be about 15

Chandra prakash - 03-10-2017

Sir what is the cost in indian rupees

admin - 03-10-2017

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