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