4 layers23.4 × 24 mm
4 layers25 × 25 mm
2-4GHzPA
db4um/PA_13cm_2W21Small 2W PA for the 13cm hamband. Perfekt as a preamp for Eshail2
- Size
- 25 × 25 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 19
- Nets
- 6
- Pads
- 104
- Tracks, vias
- 166, 135
- Pours
- 16
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 6 Mar 2019
- Updated
- 27 Apr 2019
Overview
2-4GHzPA is an open-source printed circuit board by db4um, from the db4um/PA_13cm_2W repository on GitHub, published under the MIT licence. It is a 4-layer board of 25 × 25 mm with 19 parts on 6 nets, routed with 166 tracks and 135 vias.
It is built around the SKY66295-11. Its parts include 9 capacitors, 4 connectors, 3 resistors and 1 IC.
Main components
1README
README.mdPA 13cm 2W
Small 2W CW PA for the 13cm hamband. Great as a preamp for Eshail2. Size: 25mm x 25mm
When this PA is used for SSB, a maximum output power of 1W (30dBm) is recommended to ensure linearity.
Maximum measured output power was 34dBm (2.5W), but 36 dBm should be possible as well.
The layout is built and impedance matched for the OSHpark 4-Layer process. You can order the PCB directly from OSHpark: https://oshpark.com/projects/crZvjwqi
Make sure to mount the PCB on a suitable heatsink, as the PA dissipates up to 5W. (M2.5 screws) Using thermal paste is recommended.
Measured S-Parameter:
Parts
19| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 3.3n | Capacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolder | C1, C4, C6, C8 |
| 3 | 10u | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C5, C7, C9 |
| 2 | Conn_01x02 | baum_rf:PinHeader_1x02_P2.54mm_Vertical | J3, J4 |
| 2 | Conn_Coaxial | baum_rf:SMA_Samtec_SMA-J-P-H-ST-EM1_EdgeMount | J1, J2 |
| 1 | 100p | Capacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolder | C3 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | R2 |
| 1 | 15k | Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | R1 |
| 1 | 1u | Capacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolder | C2 |
| 1 | 200k | Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | R3 |
| 1 | SKY66295 | baum_rf:QFN-16_EP_5.3x5.3_Pitch0.8mm | U1 |
The 17 most common of 19 parts.
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Questions
How big is the 2-4GHzPA PCB?
It measures 25 × 25 mm and has 4 copper layers, 1.6 mm thick.
What parts does the 2-4GHzPA use?
19 parts, built around the SKY66295-11. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the 2-4GHzPA KiCad files?
From the db4um/PA_13cm_2W repository on GitHub, at the commit this page was made from: the board is kicad/2-4GHzPA.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the 2-4GHzPA design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).