13
Connecting the DHY-04G/HD TBU 3
middle (0dB). Set the lower switch so that the bargraph normally shows
0dB (second yellow LED) with occasional peak signal levels illuminating
s6db (first red LED). If your mixing desk or source audio is only
sent at consumer level then J1 should be fitted on the PCB (See page 7
for details of this)
DTMF Detection
The caller can use this feature in conjunction with auto answer to force
external actions from the DHY-04G/HD. Once again in the case of a
journalist ringing in a report, they can press a key on the telephone keypad
to switch on an external recorder. The key used is set by the value in the
webserver (Configuration - page 20). The presence of the DTMF tones
in the incoming signal for the chosen key will activate the output on the
remote connector.
Conference Calls
The DHY-04G/HD has the ability to conference 2 calls on separate DHY-04G/
HD units together so that you need only to use 1 telco module on the mixer.
These units are linked by a CAT5 cable (wired as shown below) via the RJ45
connectors on the rear of the units. The conference calls record feature is
unavailable on the DHY-04G/HD.
Note:
This is not a standard CAT5, or CAT5 crossover, cable.
Establishing calls on both units will allow each caller to hear a mix of the
clean-feed station output and the other caller. The feed to the mixer will
contain a mix of both received calls.
The conference port cable simple cross-connects the Conference Input
(Phase and Non-Phase) signals to the Conference Output (Phase and Non-
Phase) signals respectively. It is available as an accessory, DHY-04CONF.
Using the Conference Port as a Record Output
If you are not using the conference port, it can be used to provide a
balanced audio output from the Conference Output Phase and Non-Phase
pins. This output will contain just the caller signal unless the webserver
option is selected (Configuration page 20), which will create a mix of
caller and sender on the record output.
Using the Conference Port to Share a Stereo Digital Audio
Connection between Two DHY-04G/HD Units
The DHY-04G/HD, when connected to a digital input, has the ability to
receive a stereo signal. Normally just the left channel is used for the hybrid,
but the unit can be set to use the conference port to feed the right channels
to another hybrid, i.e. you can use a stereo signal to feed two hybrids
automatically.
Set the first DHY-04G/HD unit to Digital Master Conference mode in the
webserver (Configuration page 20) and use a crossover wired connection
to another DHY-04G/HD which is set to Digital Slave Conference mode
(Configuration page 20). Now the first unit provides a telco connection
via the left channels and the slave unit provides a telco connection via the
right channels.
Figure 3-2: Conference Port Cable Connections
