SUMMARY
The amplifier works perfectly for some of the purposes we bought it for, but not all,. It was very good value at £9.59 and free delivery. We are glad we bought it.
DETAILS OF WHAT WORKED AND WHAT DIDN'T
We needed an additional amplifier because a I've used a passive splitter in a wall socket to provide the signal to both an ordinary TV and a USB TV tuner for a computer. There is already an old Labgear 4-way amplifier connected 'upstream' (where the cable from the aerial enters the house) to provide signal to sockets in various rooms. Apart from the socket with the splitter, some sockets provide 100% signal strength and quality on some channels, including the 5 main programme channels (broadcast on multiplex channels 24 & 27), but about 0% strength and 0% quality on others (multiplex channels 48, 51 & 52).
The SLx 27820R worked well to provide a good signal to both the TV and USB tuner, having it in series with the old Labgear one. I tried the new amp both plugged into the wall socket and also plugged directly into one of the four output sockets of the Labgear amp. Both these arrangements worked fine.
However, it failed to help with the absent signal on multiplex channels 48, 51 and 52 at some other wall sockets, making no improvement to the signal at all. I don't understand what's going on with the signal supplied to those sockets. It seems they or the cables that connect them selectively filter out some of the channels while passing through the others with no noticeable attenuation. This is true whether the signal is provided through the SLx 27820R or not. Perhaps it's because the problem multiplex channels are all transmitted on slightly higher frequencies than the ones that get through OK. I wonder if this is what would happen if the electricians that installed them used VHF coax rather than UHF coax.






