Giga Technology Forum

Raspberry Pi => Raspberi Pi => Topic started by: Anton Janovsky (ZR6AIC) on January 31, 2017, 09:27:51 pm

Title: Raspberry Pi 2m Low pass filter for FM SSB WSPR CW ... transmission
Post by: Anton Janovsky (ZR6AIC) on January 31, 2017, 09:27:51 pm
This board is now complete and is available from Giga Technology. http://www.giga.co.za (http://www.giga.co.za)
This repository will have all the files for the PCB that fits on a Raspberry Pi witch will have a 7 stage low pass filter for the VHF 2m band. (About 60db down for first harmonic)

This board is to be used with the rpitx utility to alow you to transmit on the 2m VHF band. This board will have 7 stage lowpass filter. Here is the filter design details. Alt text Filter similator Diagram Alt text The PCB files is Kicad file format. The circuit diagram
(https://github.com/antonjan/Bacar_Raspberry_tx/raw/master/7_stage_2m_filter_1.png?raw=true)
Alt text PCB layout diagram during design Alt text
(https://github.com/antonjan/Bacar_Raspberry_tx/raw/master/7_stage_2m_filter_2.png?raw=true)
(https://github.com/antonjan/Bacar_Raspberry_tx/raw/master/Bacar_s_diagram.png?raw=true)
Changed Connectors transistor and regulator Alt text
(https://github.com/antonjan/Bacar_Raspberry_tx/raw/master/Bacar_PCB_2.png?raw=true)
3D view of Board
(https://3.bp.blogspot.com/-RlA5kGeWTyE/WJQtsfWh60I/AAAAAAABRLQ/R7wLwnPDtDYiz507gOIL_96fbsrqqajLwCEw/s320/Raspberry_Pi_2m_TX_PCB_3D_Model.png)

This Board is now avalible from Giga Technology http://www.giga.co.za (http://www.giga.co.za)