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| Here it is shown connected to a
120w amplifier, which is
sitting on top of it. This transverter can deliver about 25w on it's own, and runs on 12v, making it suitable for portable service. When at home with 28v available, I use it with the 120w amp. It's a hybrid, and consists of a basic DEMI transverter board kit, a driver board out of a Spectrian amplifier, and my own T/R control board. I also added a small MMIC I.F. amplifier to the original transverter PCB to make up a little gain in the receiver. Power requirements are 13.5v @ 12a at 25w output. The local oscillator and transverter-to-radio interface is a separate unit, and is located elsewhere in the station. |
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| Although it has common antenna and I.F. ports, connectors on the rear panel allow direct connection to the receiver input, useful if using a remote preamp. |
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| This is the Spectrian 25w driver board shown with the
other assemblies stripped away during assembly of the transverter. The cover over the output amplifier was removed for this picture. |
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| These three PC boards, located on the back side of
the transverter board mounting plate, are the T/R control,
sequencer, and
28v boost regulator assemblies.
The 28v boost regulator provides the power for the antenna relay and the bias for the Spectrian amplifier board. |
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| Shown fully wired and tested, the transverter PCB is
mounted on the other side of the plate holding it's three support
boards, and the plate is mounted above the 25w amplifier. The antenna relay can be seen in the upper left corner. |
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| Here's how my T/R control is implemented for the DEMI board kit. The PTT line is controlled by the sequencer. |
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| The I.F. amplifier, which is mounted at the output of the receive mixer (not shown in the previous pictures). |
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| A block diagram of the transverter is shown below | |
