M0CUV’s Portable Data Modes Station comprised

QRP Labs high bands QDX digital transceiver, built for 9V supply: https://qrp-labs.com/qdx.html – the low bands variant is 80m-20m.
Kanga Products QRP Pocket Transmatch ATU: https://www.kanga-products.co.uk/ourshop/prod_7635987-QRP-Pocket-Transmatch.html
G8GYW Power/SWR meter (USB-C / battery)
https://www.amazon.co.uk/gp/product/B0BD2LTSB6/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&th=1
Power: 20000mAh USB-C power bank
https://www.amazon.co.uk/gp/product/B07YPS5JC5/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&th=1
USB-C Power Delivery to 9V cable https://www.amazon.co.uk/gp/product/B0C4XVY387/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&th=1

Driving the station is done from an iPhone; there is a similar Android app called FT8CN.
Apple iOS does not yet allow CAT over USB/Serial, so the transceiver has to be set to the correct band first, and set to VOX mode.
iFTX app for iOS: https://dl1gkk.com/iftx-ft4-8-for-iphone-and-ipad/
This needs a USB OTG cable: https://www.amazon.co.uk/gp/product/B098LG4T9X/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1

3-band (40/20/10m) end-fed half-wave antenna (10.1m + 34uH coil + 1.85m) on a 10m ‘windjammer’ fibreglass pole mounted on a ground spike, fed through a 49:1 autotransformer (QRP: 14 turns & 2 bifilar turns of 0.9mm enamelled wire wound on a FT140-43 torroid, with a 10uF 3kV ceramic capacitor across the BNC antenna socket).
N.B: The 5-band (80m – 10m) version is 20.35m+110uH+2.39m; see https://mattgumbley.wordpress.com/2018/02/04/building-an-end-fed-half-wave-antenna/#comments