Differentiated band switching frequencies > 23cm?

[DL5BCA]

Hello,

is it not possible to do a differentiated band switch (for LNA and/or PA) with frequencies > 23cm with the Portsdown, like Langstone?

[G8GKQ]

Yes

https://wiki.batc.org.uk/Portsdown_2018_Band_Switching

Dave

[DL5BCA]

Hello Dave,

Thank you for the answer

automatic only 4 status, by output MSB LSB.

I think i have to use a MCP23017.

I will test at next weekend.

[DL5BCA]

Do I have to activate it in portsdown to control the MCP23017?

It works at the Langstone.

[radiogareth]

From memory, I think I had to do it from the RPI dashboard via SSH....
I got it working and tested, but I have not used it so far and the card has been rebuilt since. Not sure if its retained in the RPi or on the card...
Gareth.

[G8GKQ]

Hi Robert

There are 3 switching lines (the transverter line is used as the 3rd), so 8 combinations are available. I am working on increasing this to 4 lines for 16 combinations.

Control of the MCP23017 is not supported by Portsdown.

Dave

[DL5BCA]

Hi Dave,

MCP23017: Then I misunderstood that. I understood it that way, because only 3 lines are available, an I2c expander was chosen as an alternative.

Now a good 8 possibilities are enough.
Can I set the signals myself, or are they fixed?

[G8GKQ]

Hi Thomas

You can force the 3 outputs to your own settings by setting them in [Menu 3], [Band Settings], [Desired Band], [Express and Lime Port Settings] to numbers above 16:

Code: Select all

16: 000
17: 001
...
23: 111

The script that does this is here: https://github.com/davecrump/portsdown4 ... er.sh#L139

I am currently revising all of the band switching so this will change soon, but there will be some backwards comapatibility.

Dave

[DL5BCA]

Thank you for the information Dave.