6
To test the batteries, simply press the Battery Test button on the
front of the unit. If the LED lights, the batteries are still good. The unit
may still function if the LED does not light, but there will be significant
audio distortion and a loss of level as the batteries continue to
discharge.
The batteries are wired in parallel so it is important to replace both at
the same time with identical batteries. If two fresh batteries are not
available, it is better to run using only one good battery. The two
battery fixtures are wired in parallel so it does not matter which one
gets the single battery.
We also provide a high quality, regulated AC to DC adapter to power
RemoteMix 3 / 3.m when AC power is available. Simply plug it into
the back of RemoteMix 3 / 3.m and plug the transformer into a 110
VAC wall outlet. When the power connector is inserted into the jack,
the batteries are bypassed. The AC adapter does
not charge the
batteries. Remember to NEVER use a different power supply than
the one that was provided with the unit. Serious damage and poor
performance could result.
Operation (continued)
Hybrid Null Adjustment (optional)
The receive side of RemoteMix 3 / 3.m has a hidden fine tuning
control which is adjusted by inserting a screwdriver into the back of
the unit just below the words Null Adj. and turning left or right. This is
a ten-turn potentiometer. This adjustment controls the level of
transmit audio that appears on the Receive audio jacks. The null
circuit matches the characteristics of RemoteMix 3 / 3.m with the
characteristics of the telephone line. Although much of the transmit
audio can be removed, this is not the equivalent of a mix-minus
output.
7
Hybrid Null Adjustment (continued)
The amount of transmit/receive isolation will depend on the quality of
the telephone line. This circuit is factory set to give a good mix on an
average telephone line, and is therefore perfect for recording both
sides of a telephone interview.
To find the absolute null for any telephone line, follow this procedure:
1. Place a call to a quiet location.
2. Send a signal down the line at moderate levels, this can be a
prerecorded tape of music or speech, or preferably a test signal.
3. Connect the Receive line output to a meter or scope, or listen to
the receive signal over the headphones. Be sure to turn up the
From Phone or Headphones volume control depending on which
method you are using to monitor the receive signal.
4. On the back of RemoteMix 3 / 3.m, below the words Null Adj.,
there is a hole for a small flat blade screwdriver. This is a 10-turn
potentiometer to allow for very sensitive adjustments. Try to
remember the position of the blade, and the number of turns you
are making as you first adjust clockwise, and then back to the
original position, and then counterclockwise.
The goal is to adjust the null signal until the receive signal contains a
minimum amount of transmit audio. However, if you want a good mix
of transmit and receive signals, you must have someone on the far
end speak or send audio down the line as you adjust for the proper
balance.
To Reset Null to Factory Setting:
Disconnect from phone line, switch the Phone Line switch to On
Hook, and the set the null to minimum. This presets the null to an
average phone line impedance.
(20 pages)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comments to this Manuals