Another great Tektronix generator is the TSG90/95. (The TSG95 is the NTSC/PAL combination unit.) A portable unit, they look like a fancy calculator.
Operates of 8 AA cells or wallwart.
Our station had a 90 and I can say it was a challenge to set up. BUT, it will do everything, even ID and tone sweep.
They were very pricey when new but used ones are down to earth on Ebay.
Here's a good video of one at work:
https://www.youtube.com/watch?v=gjlbBvNt404