A very basic transmitter for any form of broadcasting in the 40 mb.

The transmitter should be oriented to the low market segment and have desirable features in this price segment. The rig should also be easy to operate for example in developing countries even by people without any knowledge.

A very basic transmitter for any form of broadcasting in the 40 mb.

We are looking for any manufacturer or supplier of a basic 12 volt (13.8) DC powered AM short-wave transmitter and would like some feedback to what is available on the market. The transmitter should be oriented to the low market segment and have desirable features in this price segment. The rig should also be easy to operate for example in developing countries even by people without any knowledge. The requirement is a good basic transmitter with discrete components and with MOSFET (IRF510) design that can run up to 5-10 watt output with crystal clear full mod. Designed with modulator and transmitter in a robust metallic box and constructed with the philosophy of rugged simplicity and functionality. Transmitter should be built with available and inexpensive components. A backpack version good for any form of outdoor use.

Preferred requirements are:

Compact and rugged construction for portable operation. 12 volt (13.8) powered. Solid state and designed according to a philosophy of rugged simplicity and functionality with available and inexpensive components.

Ruggedness: The transmitter should be designed to withstand abrupt load mismatch errors or inadvertently disconnection from the transmitter. Resistant to high VSWR with no damage. Robust and foolproof design for outdoor use

Aprox. 5-10 watts output fully modulated.

Integrated low pass filtering.

X-tal operated (VXO) despite crystals are getting rare. Provision for two internal (or one external) crystals (two channels) selected by toggle switch and a VXO to adjust the frequency some kHz off the crystal's fundamental. A PLL tuning version is also of interest.

Line level input with switcheable audio transformer for higher levels and AM of good clean quality at least 500Hz - 8kHz. Ready to operate with CD and cassette decks, players, boom boxes, or audio mixers.

Accurate schematic and component list should be included with the transmitter, to make repair and adjustment easy. Constructed with common discrete components.

There is only interest of a good basic transmitter with no needs of unnecessary outfits.

Any manufacturer, supplier or private owner is welcome to contact us.

You will find more information about this concept here

Thanks!