1 KW 6 Meter LDMOS Amplifier
2 Meter 80W All Mode Amplifier
1 KW 2M LDMOS Amplifier
1 KW 222 MHz LDMOS Amplifier
500w 70cm Amplifier
1KW 70cm LDMOS Amplifier
A Big Power Supply for SSPAs
Low Pass Filter/Dual Directional Detector
Sampling RF Power
LED Bar Graph Meter
Amplifier Control Board
LNA Sequencing and Protection
Building UHF Antennas
MIcrowave Marker
Crystal Oven Controller
Microwave L.O.
Latching Relay Driver
12 to 28v
Relay Sequencer
High Current DC Switch
L & S Band LNA
Microwave L.O. Filters
PC Board Filters
Using Inexpensive Relays
600w 23cm LDMOS Amplifier
XRF-286 Amplifiers for 23cm
150W 23CM Turn-Key Amplifier
300w 23cm Amplifier
200w 23cm Amplifier
100w 23cm "brick"
100w 23cm Transverter
60w 23 cm Amplifier
23 CM Beacon
23cm Signal Generator
23cm Double Quad
23cm filters
13cm filter
13cm Signal Generator
13cm Transverter
120w 13 cm Amplifier
300w 33cm Amplifier
33cm filter
33 cm Crystal Source
33cm Signal Generator
9cm Transverter
Transverter Selector
12 AND 28 volts
Klitzing Amplifiers
IC-910H tweaks
Audio Files
Parts and Kits I Can Supply
Current Projects

Comments? email to

13cm Transverter

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.

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.
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.

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.

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.

Here's how my T/R control is implemented for the DEMI board kit. The PTT line is controlled by the sequencer.
The I.F. amplifier, which is mounted at the output of the receive mixer (not shown in the previous pictures).
A block diagram of the transverter is shown below