6
Off-Hook/Norm switch
Set the <Off-Hook/Norm> switch to <Norm> to dial out using a telephone. Set
the switch to <Off-Hook> to seize the line and answer an incoming call without
using a telephone.
The <Off-Hook/Norm> switch can be remotely operated using your own switch
contacts connected to the <N.O. Contacts> jack on the back of the unit. Simply
wire a 3.5 mm plug to a normally open switch. A short across tip and ring on a
stereo or mono plug will take the phone line off-hook.
Fine Tuning the Separation
1. First connect your audio equipment (powered speakers, mixer with a VU
meter, etc.) to the <Mixed Mono> output jack on the back of the
Inline Patch.
2. Next turn the <From Phone> control all the way down and the <From Line>
control all the way up.
3. Now place a phone call. Without any audio coming from the other end of
the call, hold down a touch tone on your telephone while adjusting the
<Separation> control to find the most quiet position.
4. Now turn the <From Line> control to about 12:00 and use the <From
Phone> control to bring your voice up to a suitable level.
The hybrid circuitry in the Inline Patch can provide a nominal 20 dB of
transmit / receive isolation. When using the stereo jack with stereo speakers, the
20 dB isolation will give you substantial left / right separation. The separation on
FM stereo is typically around 20 dB.
Operation
