Thanks all for the help and advice
A few weeks ago I ordered a Wouxun KG-699E handheld for 4metres - and today I received the order for the correct atenna connector - so I have plugged the handheld into the Sirio CX-4-68 antenna and my noise problem is much MUCH worse on the handheld. At least S9 across all of the 4m band, and extremeley noisey - much MUCH louder than on the FM1200 completely unworkable on the handheld due to the breakthrough / noise problem
Also I picked up a duplexer made by Procom, see information here:
http://www.procom.dk/eng/Page_menu/Prod ... /DPF_4_8_S
On the left hand side of the duplexer it is labelled "RX 77.0625" and on the right hand side it is labelled "TX 87.0625"
So my question is, how an earth do I tune this to filter out anything other than 4m?
Looking forard with interest to the replies
Thanks for all the help...