JK Audio Interchange - Manual (Page 12)

8
Interchange™ Intercom Phone Bridge
Operation with Phone Hybrids
1. Place the Interchange Talk switch in the Off position. Apply power to the
phone hybrid and place a call from a remote location. You should be able to
immediately monitor the intercom signal from the remote location.
2. Adjust the phone hybrid Send level and interchange Phone Hybrid Send
level controls for desired signal level at the remote location.
3. Change the Talk toggle switch to the Auto position to allow Interchange to
follow the call status of the phone hybrid. During an active call, the remote
location can now be heard on the intercom channel.
4. The return audio path from the remote location into the intercom can be
adjusted using the digital hybrid ‘Caller’ level and Interchange ‘Receive’
level controls. This signal will appear on the Interchange Phone LEDs. Not
necessarily on the Com LEDs. Monitor receive levels by listening on an
intercom belt pack.
5. Changing the Talk switch to Off returns the system to a remote Listen-Only
configuration.
Com Balance with Phone Hybrids
Interchange features an active hybrid to separate the unbalanced 2-wire wire
intercom audio channel into separate (4-wire) send and receive audio paths.
While nominal separation is achieved with typical operation, the separation can
be fine tuned if the intercom loop offers additional challenges. Perform the tuning
operation when the intercom network is not in use. Using the Test Tone function
on innkeeper 1x or innkeeper 2, adjust the signal level to 0 dB on the Interchange
Phone LED display (innkeeper LTD does not have a test tone feature, therefore
an alternate tone generator must be used). Be sure that the Talk control switch
is in the Talk position. Adjust the Com Balance control while observing the Com
LEDs, to find the minimum (the position where the fewest Com LEDs are lit).
Remove the test signal and proceed with normal operation.
Operation