I make two wireless adapters for Tandberg decks.
Contact me at firstname.lastname@example.org if you are interested or have any questions.
for Tandberg TD20A, TD20A-SE, TCD440A and TCD3004 tape decks. Plugs into the 8-pin Remote connector on the front of the deck. More info can be found here Tandberg RC20
I sell this one on eBay for $70 or buy direct for $65 + shipping of $8 within the US or $23 outside.
for Tandberg TCD910 and TCD911 tape decks. Plugs into the 25-pin D-sub connector on the back of the deck. More info can be found here Tandberg_RC910