Not to mention the system chaos as one momentarily selects several different TXPDR codes whilst changing the squark, activating a whol lot of flight plans.
We were told as far back as post #5 that
equipment manufacturers - of both transponders and radar processors - soon started building in what are often called 'slugs', slight delays before believing that a changed code really was the next selected code and transponders effectively switched themselves to STBY while code selections changed
Was that rubbish, then ?