Back for more. This time I've added Zweikanalton to the setup using a Philips PM5588. The PM5680 technically does have the option of it however it is not fitted in this particular unit.
Full sized image:
https://xpander.mattmillman.com/file...th_zweiton.jpg
I spent hours and hours trying to make it work. My TV was point blank refusing to accept my stereo offering despite the amplitude and frequencies of the carriers being correct.
In the end after having re-read the Zweiton spec I noticed that the pilot tone was supposed to be on the second carrier, but I was seeing it on the first carrier? Long story short I discovered that some clever cloggs inserted the modulator modules into the unit swapped over. Easy fix. To be fair they do look identical.
Anyway I'll probably throw together some YouTube vids on this setup in the new year. Much more fun than looking at pictures.