Portsdown 4 modification request

[g4saq]

A couple of years ago I requested that PD4/ Langstone should be altered so that a GPIO pin was set high when Langstone was selected and low when PD4 was selected. I wanted to operate a relay which would route the receive chain to either the Pluto (for Langstone) or MiniTiouner (for PD4), as required.

I can’t remember whether the requested mod was already in place or whether work was done to include it! Anyway, I was advised to use GPIO 21 and to set the Langstone Rx bandbits 7 (for each band) to activate the relay. This solution has worked very well indeed, providing the automatic selection that I required.

My present request is that the code should be modified to set GPIO 21 high when Band Viewer is selected and to set GPIO 21 low again when Band Viewer exits. This will automatically switch my relay and route the Rx chain to the Pluto Rx port, as required for this valuable function. (This will need to be done for both of the Band Viewer options).

Very many thanks & 73.
Russ, G4SAQ.

[g4saq]

ISSUE RESOLVED - I'm posting this note in case others are wondering if the modification has been made. Yes! Dave, G4GKQ, kindly modified the PD4 code a while back so that GPIO 21 goes high when Band Viewer is selected. This is very useful as it facilitates operation of a relay to switch the Rx chain between a MiniTiouner/ Pico Tuner and a Pluto SDR.
If, like me, the modification does not appear to work for you, the solution is to re-build the PD4 SD card with the latest image. Unfortunately, a simple update operation will not reinstate the missing file.
Many thanks to G8GKQ - again!
73, Russ, G4SAQ.