VU Meter
The VU meter is used to calibrate the amplitude of the signal you are putting into the phone line. The
MFJ-624DM meter is calibrated to –10 dBm. This means that if the meter reads 100% (zero VU), it is
actually –10dBm. The VU meter reads the level of the telephone line. Factory adjustment was done
according to ta 600 ohm standard signal (0 dBm). Telephone impedances vary in the U.S. anywhere
from 300 ohms to 900 ohms. Therefore, the meter readings will vary slightly from one phone system to
another.
Adjust the Receiver Gain control until the meter reads somewhere around 0 VU (100%) on voice peaks.
Note: Telephone company regulations prohibit you from putting any signal into
the phone line with a higher level than –9dBm. Normally, no more than –15 to –
10 dBm is necessary for good volume.
Technical Assistance
If you have any problem with this unit first check the appropriate section of this manual. If the manual
does not reference your problem or your problem is not solved by reading the manual, you may call
MFJ Technical Service
at
662-323-0549
or the
MFJ Factory
at
662-323-5869
. You will be best helped
if you have your unit, manual and all information on your station handy so you can answer any
questions the technicians may ask. You can also send questions by mail to MFJ Enterprises, INC., 300
Industrial Park Road, Starkville, MS 39759; by Facsimile (FAX) to 662-323-6551; or by email to
[email protected]. Send a complete description of your problem, an explanation of exactly
how you are using your unit, and a complete description of your station.
Содержание Telepatch II
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