70 MHz Transverter

Posted on Feb 5, 2014

A transverter on a range of 70 MHz. With access to the transceiver KENWOOD TR-751A (144 - 146 MHz), which was already prepared to work with the transverter DB6NT 5. 6 and 10 GHz, ie, output power is reduced to 1 watt, and transfer to the central core of coaxial transmission appears + 12 volts, I decided it was under him and make up to 70 MHz transverter. Block diagram of the

70 MHz Transverter
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transverter shown in the figure located in the following, where I tried to define in detail what the active element is used for what. Also shown in this figure reached my level of useful signal. The scheme of the transmitter power amplifier "PA". Initially, I wanted to do a power amplifier using module MITSUBISHI RA30H0608M, but having in the presence of a large number of high-power microwave transistors Soviet-made, I got an interesting design, assemble and adjust the amplifier is shown in the diagram on the elements. Tinkered with every denomination scheme. Construction. The basis for the boxes, as well as cooler, finned heat sink is HS115-150, bought by me here. It was convenient because it already has holes for mounting the front and back panels. All parts, except for the indicator, power button, LEDs, relays, and an antenna connector, assembled on three printed circuit boards. Fees blocks "LO" and "Main" mounted above the radiator on the rack height of 5 mm. Details and winding products. Most denominations used parts, specified in the above schemes. One of the problems in the design of this design was the use of those components, which "are at hand". Purchased items were assumed to be only on the condition that they are either facilitate or simplify a very, or decorate, etc. construction. L23 and L24 coils are taken from the receiving channel radio DRAGON SY-252N, but they can make and myself, 2 + 2 turns on the frame...

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