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Subject: A very basic transmitter using MOSFET (IRF510) for any form of broadcasting in the 40 mb.

Date: 10/14/03 at 2:10 PM
Posted by: R_QRP
E-mail: post_qrp[AT55]hotmail.com (replace [AT55] with @ to reply)
Message Posted:

Mostly wanted: A very basic transmitter using MOSFET (IRF510) for any form of broadcasting in the 40 mb.

You will find more information about this concept here: http://www.geocities.com/Radio_QRP/

We are searching for any manufacturer or supplier of a basic 12 volt DC powered AM short-wave transmitter and would like some feedback as to what is available on the US/European market i.e.: power/price. The transmitter should be oriented to the low market segment and have desirable features in this price segment. Our 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. Good for any form of clandestine operations in the 40 mb in rough terrain. The transmitter should be based on The Grenade Transmitter concept made by Radio Animal (WKND) and preferred requirements are:

# Compact size for portable operation. 12 volt 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. Robust and foolproof design for use in rough terrain.

# Aprox. 5-10 watts output fully modulated.

# Integrated low pass filtering.

# X-tal operated (VXO) despite crystals are getting rare

# Line level input with switcheable audio transformer for higher levels.

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

Any manufacturer or supplier is welcome to contact us: fmtx@euroseek.com

You will find more information about this concept here: http://www.geocities.com/Radio_QRP/

Thanks!


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