SA MIX2

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← SA_MIX1Spectrum_AnalyzerSA_TGMIX →

This page describes the 1st Mixer for the DIY Spectrum Analyzer.

Summary

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

The 2nd Mixer converts the 3.5GHz 1st IF to a 782MHz 2nd IF. The 2nd Mixer uses an LTE B13 Tx SAW bandpass filter, with a 25MHz -3dB bandwidth, and nominal 1.5dB insertion loss. The filter has >60dB rejection below 746MHz, and >50dB rejection from 842-3620MHz.

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