Some #BK4819 news!
A programming application note for it was shared in the English language Quansheng UV-K5 Telegram group.
So I machine translated and mirrored it.

Here is a direct link to the machine translated one:
https://prkele.prk.tky.fi/~ftg/files/datasheets/BK4819(V3)%20Application%20Note%2020210428_machine_translated_English.pdf

And here is the original Chinese language one to reference.
https://prkele.prk.tky.fi/~ftg/files/datasheets/BK4819(V3)%20Application%20Note%2020210428_Chinese.pdf

Test setup for measuring the RF output direct from the #BK4819 chip used in the #Quansheng #UVK5 radio.
It is soldered to the transmit output pin via the stock DC blocking cap, suspected to be 100pF.