Trying to set up the pre-set 'flicks' on the 19 Set was quite a faff - and they lacked any stability. Although we had a fully functioning 19 Set, we never used the 'B' set. We did manage once to link to a couple of short wave 'portable' sets, a WS38Mk3 and even an ancient WS18. We also had the traditional WS12 'sender' / R107 'receiver' system, which had far better range than the 19 Set. Although the specified range of the 12 Set was only about 15 miles, I've certainly worked a station in Scotland from Taunton.
The 12/107 combo covered 1.2 - 17.5 MHz. Or Mc/s as it was termed in those days. Which meant we could listen to Radio Caroline or Radio Luxembourg, but it wouldn't reach Radio London (266m / 1128 KHz). Transmission was only allowed on 5 spot frequencies, the most commonly used being 'Whisky Lima' (4030 KHz), 'Delta Oscar' (5330 KHz) and 'Tango Golf' (5972 KHz). Although I do know that some people played pop music on medium wave....
With world wide Internet radio and global comms of today, it is difficult to explain how limited things were in the late 1960s - being able to talk to someone in another county using short wave radio was quite a thrill! All RT was on AM, SSB wasn't really possible with such frequency-unstable kit.
Our normal 'infantry' system was the VHF WS88 Type A. This was a 4 channel VHF/FM radio which used frequencies around 40 MHz. It had no squelch or volume controls, so your ears were constantly battered by white noise. It was powered by a very heavy wax-coated HT/LT battery - this was still the era of thermionic valves!
An interesting quirk of the 88 Set was that channel B was on 41.4 Mhz. Unfortunately, BBC 1 405-line TV channel 1 sound from the Croydon transmitter was on 41.5 MHz. After a number of complaints about interference, a large rivet was fitted to the channel selector, preventing anything except channel C (40.90) and channel D (40.20) from being used! There was also a Type B 88 set, covering 38.01 to 39.70 MHz, but I don't think any were issued to the CCF.
Old military radio sets issued to cadet units were an excellent way of using up old MoD equipment - and it taught us a lot about voice procedure, communications security and wireless theory. Also great fun!