No subject

wideband and took a gamble on that, once confirmed on my first one I  bought a 
couple more:-)
 
Aside from frequency distribution I was also curious to try them as  LF/MF 
antenna distribution units.
I knew they were likely to be quite noisy at microvolt levels but  there's 
quite a bit of noise at LF anyway and the op amp noise actually  wasn't too 
bad.
However, when feeding into a radio with a 30MHz wide spectrum  display the 
effects of those switching regulators are immediately obvious.  They're 
running at 100KHz and the harmonics generate a nice picket fence that's  clearly 
visible up to at least 20MHz.
 
I'd still like to get rid of those switching regulators altogether but  
could really do with a schematic before trying that.
 
I assume you got a copy of the basic user manual from the seller? If not  
let me know and I'll send it to you.
 
regards
 
Nigel