Interfacing with the T41 BPF
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Ravi Miranda
Apr 28, 2026, 9:09:05 AMApr 28
to Radioberry
Hi,
How difficult would it be ti interface this :
T41/T41_V012_Files/T41_V012_Schematic_PDFs/T41_BPF_Board_V12.6_Schematic-KiCad-08-25-24.pdf
at main · DRWJSCHMIDT/T41 · GitHub over pihpsdr on the Radioberry?
I assume that I2C would be able to the relevant information to the
filter board based on the checkboxes in the OC menu?
Best 73,
Ravi/G1RVI
--
I'm here to add more value to the world than I'm using up.
How difficult would it be ti interface this :
T41/T41_V012_Files/T41_V012_Schematic_PDFs/T41_BPF_Board_V12.6_Schematic-KiCad-08-25-24.pdf
at main · DRWJSCHMIDT/T41 · GitHub over pihpsdr on the Radioberry?
I assume that I2C would be able to the relevant information to the
filter board based on the checkboxes in the OC menu?
Best 73,
Ravi/G1RVI
--
I'm here to add more value to the world than I'm using up.
KK7OEA
Apr 30, 2026, 7:50:51 PMApr 30
to Radioberry
Hi Ravi.
You need to edit file filter.h in Radioberry to use MCP23017 address and set bands in OC menu.
Ravi Miranda
May 1, 2026, 3:51:03 AMMay 1
to KK7OEA, Radioberry
Cool. Thanks. I'm ordering a set of boards, will give this a go.
Ravi/G1RVI
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Ravi/G1RVI
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G4ZAL
May 5, 2026, 7:27:14 AMMay 5
to Radioberry
Ravi,
Another idea might be to use the control board by EA3IGT which is designed to interface an HL2 to an amplifier/filters.
It emulates an N2ADR filter board and the Radioberry detects it as one.
The only limitation is that the WARC bands are 'lumped' together with other bands, i.e.10/12, 15/17 & 20/30 (in the same way as an HL2 sends band info over i2c).
I have used the control board in some openHPSDR Hermes/HL2/Radioberry projects and it works OK.
Some time ago I had some version 2 PCB's made and have altered the Arduino code to suit my different needs. I even added extra IO by using a PCF8574 module in one project.
https://github.com/ea3igt/HL2-PA70
Another idea might be to use the control board by EA3IGT which is designed to interface an HL2 to an amplifier/filters.
It emulates an N2ADR filter board and the Radioberry detects it as one.
The only limitation is that the WARC bands are 'lumped' together with other bands, i.e.10/12, 15/17 & 20/30 (in the same way as an HL2 sends band info over i2c).
I have used the control board in some openHPSDR Hermes/HL2/Radioberry projects and it works OK.
Some time ago I had some version 2 PCB's made and have altered the Arduino code to suit my different needs. I even added extra IO by using a PCF8574 module in one project.
https://github.com/ea3igt/HL2-PA70
EA3IGT has the gerbers in a zip format, so you can upload them to, for example, JLCPCB and get 5 boards for not many dollars/euro/pounds/beer tokens (I only choose regular mail as it is the cheapest postage option and still arrives in 10-14 days).
Nigel, G4ZAL
Nigel, G4ZAL
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