SC4x0 Technical manual
Page 21 of 34
SeaCom
Rev
2.00
To aid the adjustment, a bar graph of 11 chars is showing the actual signal level. When distortion is
detected a ‘P’ will be shown at the end of the bar.
The gain should be lowered or raised until this ‘P’ is not lit when speaking at a high nominal level
under normal working conditions.
For best performance, lower the gain by just one step when adjusted as described above.
Use ’
▲
’ or ’
▼
’ to select level and press ‘M’ for store and exit.
If used in quiet room for remote monitoring, raise the gain until a satisfying level is achieved at the
listener.
This may, however cause duplex conversation to become difficult, as the site telephone tends to be in
transmitting mode always. To overcome this problem either a compromise regarding the gain at the
site end must be set or PTT mode or command call mode has to be used at the site end.
This adjustment has to be made to all microphones in use.
NOTE: When adjusting the handset, remember to hold the hook switch down to access the
menu system.
9.4 Relay function
The relay function is used for external ringing indication in e.g. E.R. or for connecting a electro
mechanical bell. The relay function can be selected to give indication on telephone calls, PA calls or if
telephone is in use. The last is intended for disconnecting any local speaker for making PA calls to a
system outside the exchange to avoid feedback through the telephone.
The relay function can be programmed as inverse function is power fail indication is needed.
9.5 Dial signal type
Normally DTMF signals are use to dial numbers. However, if connected to older systems or special
adoption is needed, the telephone can be programmed to use pulse dialing (loop disconnect). Pulse
dial can selected for international or Swedish mode.
Pulse dial using earth connect mode is not possible.
9.6 Hands free voice control
If the telephone is to be used in very noisy areas, either PTT mode (manual mode) or stability margin
above 30dB should be used.
Performance can be improved by adding an external speaker to work in parallel with the local speaker
and raising the stability margin.
9.7 Bell signal and volume
There are 8 different bell signals to select from. Some are low tone some are high tone. Two have the
sound equivalent to an old mechanical bell.
The ringer has its own adjustable volume setting. The volume can be set from menu level 1.
NOTE: Setting the volume above step 11 will cause distortion of the ringer signal and may cause a
considerable current consumption from the power supply if external speaker is connected.
9.8 PA volume
There are two level of PA volume. One for normal PA call and one for PA call having volume override.
Using volume override means full volume and will bypass the PA volume setting from menu level 1.
---Local mic.---
>********___ P<
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