2008 Updates
Welcome to KC5EFM on the 3 cm band.
His homemade transverter worked well at 16 miles, so far.
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KC5EFM's 3cm transverter. A DEMI transverter control circuit is used to interface the IF radio.
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The 10224 MHz LO is split to feed the Transmit and Receive mixers.
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KE5HHU Lowest band first...
1.25m
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This is the assembled unit for use on 222 MHz using a 24 MHz IF.
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Power and Status Indicators. Green for power, Yellow indicates in-band for the IF, and Red for transmit.
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Control and IF connections. This connects to the Yaesu FT-817 ACC port.
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A look inside.
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5 Watt amplifier.
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The antenna BNC is on the right, with T/R relay close by.
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My 222 MHz antenna is this 3 element yagi.
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The 33cm and 23cm units are DB6NT kits that Mark,
N0IO
assembled. I interfaced the power and antenna switching.
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DB6NT 23cm unit.
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View of transverter and switching relay.
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Weather resistant package.
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DB6NT 33cm unit with external power amp. Switching relay and connection plumbing shown.
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Mounts directly on the antenna U bolt. About 20W output.
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These are the 23cm and 33cm loop yagis.
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33cm transverter in its plastic tub.
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23cm transverter with amplifier.
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Power control and IF switch relay.
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24V 20A power supply.
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Everything that goes into the big tub.
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As it sits in the big tub.
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The RF and power lines enter just below the handles so the holes are shielded from rain.
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Here is a view of the tub at the base of the mast with Heliax feeds to the 23cm and 33 cm antennas.
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3cm DEMI Transverter
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This is the repackaged 3cm transverter and other assorted parts.
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Left to right, transverter, power amp, power regulation, case and heatsink.
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End view of the DEMI transverter. I built this from a kit.
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The 3cm PA is built on a slide tray along with it's switching circuitry.
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10V regulation module for the PA.
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Assembled in the box.
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Connect and slide the PA tray into the box.
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The beacon keyer module is mounted on the opposite end of the box.
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Assembled unit.
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Stack with the transverter box.
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2006
The first three transverters I acquired were the 13cm,
9cm, and 5 cm DEMI versions from N0IO.
These three are packaged together and mounted to the
back of a 29 dBi grill type dish.
We built a IF selection relay
module and an array of relays to switch the T/R for each band
and connectivity to the log
periodic (WA5VJB) dish feed.
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Three transverters mounted together. 13cm, 9cm, 5cm.
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Assembly mounted on a dish.
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The next two transverters also came from N0IO. These are
for the 3cm and 1.2cm bands.
They are mounted together on a tripod base each with
their own horn antenna. The DEMI 3cm
transverter is below the Yaesu FT-817, the IF radio for
both bands.
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Rear view of the 3cm unit, the IF radio, the LO and its power supply for the 1.2cm unit.
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Side view of the 1.2cm unit. From left to right, the LO power supply, the 12GHz LO, the 24GHz assembly.
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The 24 GHz unit contains no moving parts. All input/output switching is done with circulators.
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The DEMI 10GHz unit, and 20 dBi horn.
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Looking down the waveguide. Don't do this!
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This pi shaped object is the transverter, filter, circulator, receiver, circulator, transmitter, and horn.
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