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The biggest problem is the isolation of the Pi4 field PC. I think every builder experience his own but here is my thoughts?
I experienced some problems with BAP as well as the Pi freezing up but hope to resolve this. As I am using a single PSU source, my solar batteries, for my PC, radios etc I think this is where my problems is with it all.
The isolation of the field PC has become to be one of my biggest headache and is born from the fact that AGM cells is extremely expensive so all is supplied from a single source but hope to resolve this soon and post some ideas/findings soon
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73 de Eugene / ZR4EM

The audio on a Pi4 is and always be the Achilles heel for a Pi
Now I've got some heat problems in my container but aims too correct it soon with an commercial cooler.
The Pi hangs up because of heat problems but my PSU is now isolated from the radio thanks to a MeanWell isolated 5V DC-DC converter
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73 de Eugene / ZR4EM

The build went good but this is the process I took for installing BAP.
In the first instance I made sure that the FLRig and HAMlink is installed and working. This is not always true as the problem seems to be with the dependencies which may differ for each setup. I have paged trough the install log for the installation of FLRig as this is my main program for accessing the CAT controls of my FT-897 and it seems that in certain installations different dependencies is missing and does not install correctly. It is a pain in the butt but I then search the Internet for the file it is moaning about and install the dependency manually and then retry FLDigi again. This is my first and foremost package I do with BAP as I have restarted my Pi4 a lot of times and each time the required dependencies differ. If FLRig and Hamlib is working perfectly and the comms to the radio is working I continue with the installation of BAP.
With regards to Conky I'm not worried anymore of displaying the grid locator as it seems that the manual installation of GPSD is working and displaying everything correctly but it does not appear on Conky, maybe a bug somewhere but conky is very volatile with regards to its working but the update tool for WSJT-X and JS8call is working perfectly even though Conky does not display the grid square. Im thinking about using the Arduino externally with an OLED and serial GPS to display the grid square and the UTC time on the OLED for reference but is not there yet. Just thinking about that.
Anyway it seems to improve the performance of the Pi4 if you Isolate the 5VDC supply from the rest of the DC supply including the radio, is there seems to be and Improvement on the stability of the Pi4 when transmitting digital on higher power setting (>20W)
I used a DC-DC converter from the supply line for the 5VDC supply of the Pi4 and the build in USB hub and Isolated the Pi4's USB3 from the rest of the radio stuff as this seems to be an big problem on the Pi4. My OS is running on a external SSD with USB3 so i cannot switch this off. The lasting problem seems to be the audio on the? Linux distro but my thought process is working on this problem. At least the CAT comms between the Pi4 field PC and the rig seems to be sorted.
Jason any thoughts?
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73 de Eugene / ZR4EM

The build went well, without any major hick-ups, but yes there is always something, like forgetting to plug in something or whatever. But yes it is up and running.
The built details is as follow,
The power supply is Isolated via an DC-DC converter of MeanWell 9-18VDC with an output to 5VDC for the Pi and USB hub.
The power supply to the monitor, Waveshare 11.6 full HD monitor, is isolated via a DC-DC converter of Tracopower TEN 15W to enable a stable output from 9VDC-18VDC to 12VDC
I also have an DC-DC converter (not sure if it is isolated) from any input up to 36VDC to an stable output of 12VDC (adjustable)
In the box is build-in the three DC-DC converters, and USB2 HUB, PCB connected to the GPIO connector of the Pi 40pin with the following
5V DC output to the system fan, 5VDC output to the two chassis fans for inflow, I2C connector for peripherals e.g. OLED, DB9 for I2C SPI and UART connection via the DB9 male chassis connector, push button for safe shutdown as well as a LED with confidence pulse when the Pi is booted up, USB HUB, 120GB SSD with OS installed on it via the USB3 port.
The system fan and cooler is a low profile ICE cooler heat pipe cooling with an 40mm 5VDC fan
Cooling is provided by one 40mm sq X 10mm and 40mm sq X 20mm fan while two 40mm sq X 10mm exhaust fans is fitted on top for assisted box cooling.
The DB9 connector I have not tested yet
The hiccups began when I exchanged the DLink USB2 HUB with another? 7port USB2 Hub because with the mod I have blown an USB hub chip on the DLink so a few ports on the Dlink is not working anymore. The whole OS changed and the USB devices did not want to connect to the applications for HAM radio, even my custom made Prolific USB to RS232 connector for the Yaesu-FT897D, a panel mount Micro HDMI to HDMI connector as well as the USB audio COB dongle.
What a nightmare, It cost me to re-install the Pi OS as well as BAP.
With BAP I installed the FLrig and HAMLIB and checked if it was working before I installed anything else.
The I proceded with FLDigi and ARDOP asn finally the WSJT-X and JS8Call
At the moment the following devices is connected to my USB input,
An Homebrew Prolific adapter for the FT-897 CAT
An USB Sound COB dongle to the custom cables for the Audio I/O
A homebrew USB GPS from UBLOX NEO5
An external WiFi device with an external cable antenna to extend the WiFi signal and to keep it as far as possible from the other RF
An HDMI KVM switch with keyboard and mouse sharing
The USB touch input of my 11.6" monitor running from the Tracopower DC-DC converter fitted on the box
What a build! everything in an box approximately 7.5" X 6" X 3 " in size, smaller than my FT-897.
The device temperature in my shack is about 10C above the ambient temp in my shack.
Everything is running from a DC supply, even the FT-897 and ICOM 2m/70cm radio
It seems to be very stable and no USB or any other problems or conflicts ATM.
The only thing I have to sort out is the audio between the FT-897 and the Pi4, but that's another story. I want to build an external PiZero with an IQaudio Codec Zero connected via serial comms to the Pi4 via SPI or UART.
Hope thats my complete build. No external wires etc, all is done from chassis mount connectors

73 de Eugene / ZR4EM

Nice build! Can you post pictures please. Thank you.?

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73 de Eugene / ZR4EM

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73 de Eugene / ZR4EM

The images is before I added the DB9 connector etc, but this give you a general Idea
The box is now quite overcrowded and attaching the connectors is quite an headacke. Hope I do not have to do this again. The monitor is fitted on the box's top cover and connects to the HDMI, USB and power Isolation DC-DC converter, the Tracopower's TEN? 15W DC Isolated converter.
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73 de Eugene / ZR4EM