Multiband Microwave Transverters for the Rover - W1GHZ

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the LO section of the board. Note that the capacitors are at the shorter location on thequarter-wave chokes – this copy is for 3456 MHz.Then move C6 to connect theLO to the mixer. Solder themixer down carefully, since thebottom is open (turn it over andadmire the tiny transformersfirst), making sure to align itaccording to the picture, Figure15. The mixer pipe-cap filter istuned using the receive port as atest point, jumpering the MMIClocation A1 with a wire asshown in Figure 16. Only thesplitter resistor, R1, is needed atthis point. With only the LOrunning, set the pipe-cap tuningscrew the same height as theLO screws, then tune for a peak– this is at the LO frequency.Then apply 0 dBm at 144 MHzto the IF port. Now adjust thescrew for a larger peak at theFigure 14 LO section of Transverter board
RF frequency: 2304 MHz is higher than the 2160 MHz LO, so the screw should bebacked out of the pipe cap to peak, but 3456 MHz is lower than the 3600 MHz LO so thescrew should be tuned in to the cap for a peak. Tuning in the wrong direction will peakon the image frequency. Output from the receive port, being used as a test point here,should be on the order of -13 dBm. Check the output frequency if you can.Figure 16. RX port used for filter tuneup, with wire jumper in place of A1Remove the jumper wire from the A1 location,then assemble the transmit section. The driverstage, A4, is shown at the bottom of Figure 17,right, and the final stage, A5, in Figure 13. Setthe final tuning screw to the same height as themixer screw, power it up, and apply 0 dBm at144 MHz to the IF port. Peak the pipe-captuning for maximum output, at least +10 dBm.Finally, assemble the receive section as shownin Figure 17. Power the receive MMIC withabout 5 volts (everything else runs on 8 volts)and connect a two-meter receiver to the IF.Stick a short wire in the SMA jack and tune ina signal – harmonics of my 1152 MHz markerare loud from across the basement. If you canmeasure noise figure, adjust the voltage to thereceive MMIC to optimize – best noise figureshould be somewhere between 5 and 7 volts.
Page 1 and 2: Multiband Microwave Transverters fo
Page 3 and 4: Part 2: Oscillator BoardThe oscilla
Page 5 and 6: capacitors in parallel and the simu
Page 7 and 8: The combline filter is followed by
Page 9 and 10: Part 3: Transverter for 2304 and 34
Page 11: A single mixer, the ADE-18W, is use
Page 16 and 17: Part 4 - 1296 MHz Transverter (work
Page 18 and 19: Figure 20 Mixer and 1296 MHz Hairpi
Page 20 and 21: The small PC board for the relay is
Page 22 and 23: Another choice for the power splitt
Page 24 and 25: A bit of historyThe description abo

Multiband Microwave Transverters for the Rover - W1GHZ

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