746 wired for Europe - UK Vintage Radio Repair and Restoration Discussion Forum

dougmiller · 2nd Dec 2011, 4:10 pm

Hi,
Can anyone tell me how I could wire a 746 for use in Spain (or most of Europe for that matter) on their 2-wire RJ11 system. My limited knowledge makes me think that I will need to somehow 'bridge' the ringing wire to get the 746 to ring.

Dave Moll · 2nd Dec 2011, 4:48 pm

For two-wire working substitute a link between T6 and T7 instead of the blue wire to T6, making sure that T8 and T9 are also linked. Otherwise, wire the same as for the UK, with the line between T8 and T18.

dougmiller · 2nd Dec 2011, 6:27 pm

Thanks very much Dave.

julie_m · 3rd Dec 2011, 1:40 am

The BT746 has its own internal ringing capacitor for 2-wire working (or 4-wire working with bells in series). Look up the wiring diagram, N846 - I'm pretty sure there is already a link to it if you search for it. Wire the phone per diagram but with a 3.3kΩ resistor in place of one of the straps in series with the bell, and "A" and "B" are the two wires of the phone line.

Spain uses RJ-11 connectors; probably simplest to buy a cheap lead in Spain with an RJ-11 on one end, cut off whatever is on the other end and wire the middle two conductors to "A" and "B".

2nd Dec 2011, 4:10 pm	#1
dougmiller Retired Dormant Member Join Date: Dec 2011 Location: Rugby. Posts: 5	746 wired for Europe Hi, Can anyone tell me how I could wire a 746 for use in Spain (or most of Europe for that matter) on their 2-wire RJ11 system. My limited knowledge makes me think that I will need to somehow 'bridge' the ringing wire to get the 746 to ring.

2nd Dec 2011, 4:48 pm	#2
Dave Moll Dekatron Join Date: Feb 2005 Location: West Cumbria (CA13), UK Posts: 6,127	Re: 746 wired for Europe For two-wire working substitute a link between T6 and T7 instead of the blue wire to T6, making sure that T8 and T9 are also linked. Otherwise, wire the same as for the UK, with the line between T8 and T18. __________________ Mending is better than Ending (cf Brave New World by Aldous Huxley)

2nd Dec 2011, 6:27 pm	#3
dougmiller Retired Dormant Member Join Date: Dec 2011 Location: Rugby. Posts: 5	Re: 746 wired for Europe Thanks very much Dave.

3rd Dec 2011, 1:40 am	#4
julie_m Dekatron Join Date: May 2008 Location: Derby, UK. Posts: 7,735	Re: 746 wired for Europe The BT746 has its own internal ringing capacitor for 2-wire working (or 4-wire working with bells in series). Look up the wiring diagram, N846 - I'm pretty sure there is already a link to it if you search for it. Wire the phone per diagram but with a 3.3kΩ resistor in place of one of the straps in series with the bell, and "A" and "B" are the two wires of the phone line. Spain uses RJ-11 connectors; probably simplest to buy a cheap lead in Spain with an RJ-11 on one end, cut off whatever is on the other end and wire the middle two conductors to "A" and "B". __________________ If I have seen further than others, it is because I was standing on a pile of failed experiments.