You will get a much cleaner signal with the attenuator before the amplifier. Not sure where your 4-way output switch is, but the max sensible power handling for that is only about 40 mW, and it starts distorting above 20 mW.
No holes drilled so far
Watching the streams available - amazing what's been done (by repeater keepers) and how well it works on the RPi Portsdown.
Question: How to reset the RPI password - I've done my usual and dreamed up something amateur related, but not written it down. I'd guess its a card rebuild required.....note to self etc...if I could remember where I put the note....
Password change: https://howtoraspberrypi.com/recover-pa ... pberry-pi/
Unless you have potential threats on your local network (as you might if you are running an unattended repeater streamer), or your RPi is powered up 24/7, and as long as you are behind a router, I do not recommend changing the password from the default.
What sort of external connectivity have people chosen to interface with external amps? Something plug-in and multi-pined or perhaps a bank of screw down terminals. Maybe a D-Type plug/socket arrangement, cheap and reliable at the likely current? I'm planning/assuming that it will (a) operate the (chosen) amplifier power-on relay and (b) turn on e.g. amp bias when TX is also selected?
Also found a nice compact tripod for the Picam. https://www.thingiverse.com/thing:1460181 which would also do good service with a conventional camera. There is room inside the RPiCam 3D housing to accommodate a 3mm screw head which I've retained with a short hex standoff on the outside. This will allow easy attachment to anything upwards of a lolly stick.....
Personally I find them really useful on the rear panel adjacent to the relevant SMA connector ...so there is never any doubt which port is energised.
I have on loan at the moment a 23cm Tonna yagi ...and I was considering a copy if it were possible to replicate the 'stand off' mounts for the elements which are mounted on a standard square section aluminium mast.
The only difficult bit would be guessing what is in the folded dipole mount without resorting to an Xray!