Wave Bubble Gain stage
Gain stage notes
The gain stage is designed to give you that extra bump of power. The layout is generic enough to use nearly any SOT86 or SOT89 active or resistor biased gain stage. The one chosen is probably the best available: 5V active biased, SOT89. Reading the datasheet will help you set the values if you want to fine tune the jammer for a specific frequency of operation. For resistor biased gain stages, replace the ferrites with appropriate valued resistors.
Gain stage parts
*SXA-389B
Q2, Q3
SOT89 MMIC gainstage
2
$3.59
$7.18
22nH 0603 wirewound
L7
RF choke for ~2GHz
1
$0.40
$0.40
33nH 0603 wirewound
L8
RF choke for ~1GHz
1
$0.42
$0.42
1206 Ferrite bead
R27, R28
Noise reducing ferrites
2
$0.12 $0.24
18 ohm 0603 resistor
R23-R26
Tee network attenuator
4
$0.07
$0.28
68 ohm 0603 resistor
R32
Tee attenuator (may have to adjust)
Digikey
1
$0.07 $0.07
68pF 0603 capacitor
C40, C42
Blocking capacitor for ~2Ghz
2
$0.03
$0.08
100pF 0603 capacitor
C41, C43
Blocking capacitor for ~1GHz
2
$0.03
$0.08
1000pF 0603 capacitor
C44, C47
Bypass capacitors
2
$0.03
$0.06
0.1uF 0603 capacitor
C46, C49,
Bypass capacitors
2
$0.15
$0.30
22pF 0603 capacitor
C45
Filter capacitor for ~2GHz
1
$0.04
$0.04
68pf 0603 capacitor
C48
Filter capacitor for ~1GHz
1
$0.03
$0.03
Total:           $2-$10
Assembly
Get all the components necessary
Solder in all the components. The final output capacitor should go either to the external antenna pads (straight) or the internal antennas (right angles)
May 17, 2011 20:07