Interfacing with the T41 BPF

[Ravi Miranda]

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

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I'm here to add more value to the world than I'm using up.

[KK7OEA]

Hi Ravi.

You need to edit file filter.h in Radioberry to use MCP23017 address and set bands in OC menu.

I2C board setup for LPF/BPF

[Ravi Miranda]

Cool. Thanks. I'm ordering a set of boards, will give this a go.

Ravi/G1RVI

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[G4ZAL]

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

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