SA TGMIX

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This page describes the Tracking Generator Mixer for the DIY Spectrum Analyzer.

Summary

Schematic for the rev0VTx VCO.
Board for the rev0VTx VCO.

The Tracking Generator Mixer is based around the SIM-83+ 2.3-8GHz Wideband Level 7 Balanced Mixer. The tracking generator mixer downconverts the 1st LO of 3.53-6GHz to a +10dBm 30MHz-2.5GHz output via a 3.5GHz LO. The PCB includes several amplifier stages to boost the LO and output power, matching pads on the mixer inputs/outputs, and a low-pass filter on the output.

Testing

  • 8.15.2013: ...


Frequency (MHz) Power (dBm)
150 -0.06
200 -0.02
250 -0.03
300 -0.07
350 -0.06
400 0.03
450 0.04
500 0.02
550 -0.07
600 -0.07
650 0.05
700 0.09
750 -0.05
800 -0.03
850 0.02
900 0.00
950 -0.07
1000 -0.10
1500 -0.17
2000 0.21
2500 0.04
3000 0.62
3500 1.72
4000 1.47

Revisions

  • 1.0: Initial revision.

Bill of Materials (v1.0)

Part Quantity Unit Cost Total Cost Source
ADF4350 1 $12.02 $12.02 Digi-Key
FOX924B-10.000 1 $3.76 $3.76 Digi-Key
ADP124 1 $1.95 $1.95 Digi-Key
AP1115 1 $0.54 $0.54 Digi-Key
MSP430G2553 1 $2.58 $2.58 Digi-Key
0402 100nF Capacitor 10 $0.011 $0.11 Digi-Key
0402 10pF Capacitor 10 $0.0116 $0.12 Digi-Key
0603 Capacitor 9 $0.0096 $0.09 eBay - mib_instruments
0603 4.7uF Capacitor 3 $0.1484 $0.45 Digi-Key
0805 10uF Capacitor 1 $0.30 $0.30 Digi-Key
0603 Resistor 10 $0.00294 $0.03 eBay - mib_instruments
0603 Green LED 1 $0.10 $0.10 Digi-Key
0603 Red LED 1 $0.27 $0.27 Digi-Key
0603 Ferrite Bead (470 Ohm) 2 $0.0472 $0.09 Digi-Key
Male Header 8 $0.01 $0.03 eBay
SMA Female Connector 4 $3.37 $13.48 Digi-Key
PCB 1.75"x1.1"/3 $10.00 $6.42 Laen's PCB
Total Unit Cost $42.32

PCB/Construction Photos