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Tone/PulseDialing
RemoteMix Sport is equipped with a switch to select tone (DTMF)
dialing or pulse dialing. The switch is located underneath the battery
door. With the switch towards the volume control knobs, the unit is in
the “pulse” mode. When in “pulse” mode the “*” key will set the unit to
transmit digits as tones regardless of the switch position. To return to
pulse dialing turn the keypad off and back on.
Power
RemoteMixSportispoweredbytwo9voltalkalinebatterieslocated
under the cover on the bottom of the unit. Under normal use, you
should get at least 30 hours of continuous use from a fresh set of
batteries.
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
continuetodischarge.
Thebatteriesarewiredinparallelsoitisimportanttoreplacebothat
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
getsthesinglebattery.
Wealsoprovideahighquality,regulatedACtoDCadaptertopower
RemoteMix Sport when AC power is available. Simply plug it into
the back of RemoteMix Sport and plug the transformer into a 110
VACwalloutlet. Whenthepowerconnectorisinsertedintothejack,
the batteries are bypassed. The AC adapter does not charge the
batteries. Make sure to use only the supplied adapter with the
RemoteMix Sport. Using any other adapter will damage the
unit.
Operating(continued) HybridNullAdjustment (optional)
The receive side of RemoteMix Sport has a hidden fine tuning control
which is adjusted by inserting a small flat blade 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 Sport 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.
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
sidesofatelephoneinterview.
Tofindtheabsolutenullforanytelephoneline,followthisprocedure:
1. Placeacalltoaquietlocation.
2. Sendasignaldownthelineatmoderatelevels,this canbe a
pre-recordedtapeofmusicorspeech,or preferablyatestsignal.
3. ConnecttheReceivelineoutputtoameterorscope, or listen
tothereceivesignalovertheheadphones. Be sure to turn up the
FromPhoneorHeadphones volume control depending on which
methodyouare usingtomonitorthereceivesignal.
4. OnthebackofRemoteMixSport,belowthewords Null
Adj.,thereisaholeforasmallflatblade screwdriver. This is a
10-turnpotentiometertoallow for very sensitive adjustments.
Tryto rememberthepositionoftheblade,andthe n u m b e r
ofturnsyouaremakingasyoufirstadjust clockwise, and then
backtotheoriginalposition,and then counterclockwise. The
goalistoadjustthenull signal until the receive signal contains
aminimum amount of transmit audio. However, if you want a
goodmixoftransmitandreceivesignals,youmust have someone
onthefarendspeakorsend audio down the line as you adjust for
theproper 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.