[Premium-Rx] RACAL RA3701 FILTERS

[Mikewhiskyone at aol.com]

Hi, can anyone point me in the right direction, a long time ago, I bought  an 
RA3702 even got wshop man, but no operation man. I am looking for a copy of  
same, printed, downloaded, on CD, anything will do. Also, this one has some 
nice  filters installed, 400hz, 1khz, 3khz, 12khz(probably bypass) but no 6khz 
filters  in either receiver, or so I thought, on opening up the IF/AF modules, 
all  filters present, but also there are 6KHZ ones. I have established that 
there is  nothing wrong with the filters or the mdules, putting either module in 
a  friend's set(his modules are exactly the same as mine, even down to filter 
 bandwidth and position on the circuit board) brings up all filters  
including the 6KHz, but putting his modules in mine, still no 6khz, so  presumably the 
processor module does not know there are 6khz filters fitted,  they look 
different to the other ones in there, correct spec etc, but give the  impression 
they were added after manufacture. Does the procedure to get the  filters 
rcognised get covered in the ops manual? can anyone give me some hints,  I see they 
have to be assigned addresses, but how? any suggestions really  welcome, Dave.