The UW 342 is a VHF and UHF generator covering frequencies from 4 to 900 Mhz. It is also a “wobbler”, a sweep generator.
I bought this signal generator on a radio flea market of the Rotterdam Radio Museum in 2005. I thought this would be a nice generator to test FM receivers. Though the front is a bit dull and the case a bit scratched, it seems to be in perfect condition on the inside. I could not do much with it, because the manual didn't come with it and it looked a bit too complicated. I decided to postpone reverse-engineering the thing. Some years later, in 2012, a kind hobbyist from Germany sent me a scan of the user manual and circuit diagram. Now I will be able to start to get this generator to work.
It has two separate oscillators, one for UHF and one for VHF. The UW-342 has two 60 Ω coax outputs. One of them covers a lot of bands from 4 Mhz to 900 MHz. There is a sweep control. Two other knobs I don't understand. On the front, there are also two pin plug receptacles, maybe these are the sweep output.