• Good reflector thread
• Blog post

4-8 Ah seems good. “6.5 Ah 3 hours @ 50 W”

FT857 RX current draw is advertised as 1A but I found it to be a bit less than that. Approximate FT857 TX current draw:

• 5W = 5.8A
• 20W = 7A
• 50W = 11A
• 100W = 16A

Nice example.

With MFJ 904H Travel Tuner, or 902B?

Thread to read on options

Some recommendations:

• https://www.hamradio.hanklambert.com/my-gear/radios/yaesu-ft-857d
• https://web.archive.org/web/20241206043216/https://vk1nam.wordpress.com/yaesu-ft-857d-menu-settings/

Service manual

VFO knob - S 4017 ROTARY ENCODER RES20D50-201-1G Q9000709A

e.g. https://www.radioworld.co.uk/yaesu-rotary-encoder-q9000709a-ft-897-main-tuning-encoder

Selector knob - ROTARY ENCODER EC12E24244A4 Q9000796

https://www.radioworld.co.uk/yaesu-genuine-select-rotatory-encoder-q9000796-spare-part