Above is a recent ICQ podcast interview with Ian.
Here is a slightly older interview with Ian: https://www.itv.com/news/meridian/2018-10-19/daring-spies-who-broadcast-from-behind-enemy-lines
This sojoun into spy land started with this WTF video: https://www.youtube.com/watch?v=4f3ZJYdmpZw
Crypto Museum explains what the Mk 301 was all about: https://www.cryptomuseum.com/spy/mk301/index.htm
I have had Ian on the SolderSmoke blog several times: https://soldersmoke.blogspot.com/search?q=%22Ian+Keyser%22
N2CQR at the key with a G3ROO paraset