JK Audio RemoteMix C+ User manual

RemoteMix C+
Portable Mixer for Remote Telephone
Broadcasts
Users Guide
JK Audio, Inc.

Operating
SendSide(ToPhoneLine)
There are separate volume controls for the two microphone
inputs and the line input (To Phone Line) jack. You can use
all three inputs at the same time. Mic 1 also has a Mic/Line
selector switch which lowers the gain on the Mic 1 XLR jack
by30dBtoallowabalancedlinelevelinput.
ReceiveSide(FromPhoneLine)
Thereceivesidehasseparatecontrolsforheadphoneoutput
level and tape receive output level. The Line Out control
adjusts the signal going out the RCA and XLR jacks marked
FromPhoneLine.Thisisamixofbothsidesofthetelephone
call.
Headphones
The built-in headphone amplifier is strong enough to power
two pair of headphones or a small desktop speaker. The left
and right channels contain the same mono signal, but are
powered by separate amplifier channels. These jacks will
drive either two 1/4" stereo plugs or two 1/4" mono plugs.
Connections
RemoteMix C+ is a professional audio mixer designed to
work on any standard analog telephone line. It can also
connect to many cellular telephones using a fax/modem
adapter available from your cellular telephone
manufacturer. Simply plug your audio equipment into
RemoteMix C+ and connect to a phone line. You can now
putonheadphones,pluginamicrophone,andyouareready
tobroadcastthegameortalkupatapedinterview. TheRCA
type jacks on RemoteMix C+ are equivalent to the jacks
found on most home tape recorders, CD players, and
receiver/amplifiers. The balanced line XLR jack provides a
high quality connection to mixers and professional tape
gear. Theadjustable hybrid circuitprovidescontrol overthe
mixoftransmitandreceiveaudioattheoutputjacks.
1. Connect your audio equipment, microphone, and
headphonestotheinputandoutputjackson
RemoteMixC+.
2. Connect the jack marked "Phone Line" to any
standard analog telephone line or to the Fax/Modem
adapteronacellulartelephone.
3. Turnonthepowerswitch,flipthe"PhoneLine"switch
to"Dial/Talk"and dial yourcall. Youarenow ready to
broadcastorrecordatelephoneinterview.
CellularTelephones
RemoteMix C+ was designed to work well with the data
interface (fax / modem adapter) for your cellular telephone,
available through your cellular dealer. These adapters turn
your cellular telephone into an RJ11 equivalent jack which
replaces the wall jack in this picture.
Audio Equipment
RCA or XLR
Input or Output
Microphone(s)
Headphone(s)To wall jack
2 3

Operating
SendSide(ToPhoneLine)
There are separate volume controls for the two microphone
inputs and the line input (To Phone Line) jack. You can use
all three inputs at the same time. Mic 1 also has a Mic/Line
selector switch which lowers the gain on the Mic 1 XLR jack
by30dBtoallowabalancedlinelevelinput.
ReceiveSide(FromPhoneLine)
Thereceivesidehasseparatecontrolsforheadphoneoutput
level and tape receive output level. The Line Out control
adjusts the signal going out the RCA and XLR jacks marked
FromPhoneLine.Thisisamixofbothsidesofthetelephone
call.
Headphones
The built-in headphone amplifier is strong enough to power
two pair of headphones or a small desktop speaker. The left
and right channels contain the same mono signal, but are
powered by separate amplifier channels. These jacks will
drive either two 1/4" stereo plugs or two 1/4" mono plugs.
Connections
RemoteMix C+ is a professional audio mixer designed to
work on any standard analog telephone line. It can also
connect to many cellular telephones using a fax/modem
adapter available from your cellular telephone
manufacturer. Simply plug your audio equipment into
RemoteMix C+ and connect to a phone line. You can now
putonheadphones,pluginamicrophone,andyouareready
tobroadcastthegameortalkupatapedinterview. TheRCA
type jacks on RemoteMix C+ are equivalent to the jacks
found on most home tape recorders, CD players, and
receiver/amplifiers. The balanced line XLR jack provides a
high quality connection to mixers and professional tape
gear. Theadjustable hybrid circuitprovidescontrol overthe
mixoftransmitandreceiveaudioattheoutputjacks.
1. Connect your audio equipment, microphone, and
headphonestotheinputandoutputjackson
RemoteMixC+.
2. Connect the jack marked "Phone Line" to any
standard analog telephone line or to the Fax/Modem
adapteronacellulartelephone.
3. Turnonthepowerswitch,flipthe"PhoneLine"switch
to"Dial/Talk"and dial yourcall. Youarenow ready to
broadcastorrecordatelephoneinterview.
CellularTelephones
RemoteMix C+ was designed to work well with the data
interface (fax / modem adapter) for your cellular telephone,
available through your cellular dealer. These adapters turn
your cellular telephone into an RJ11 equivalent jack which
replaces the wall jack in this picture.
Audio Equipment
RCA or XLR
Input or Output
Microphone(s)
Headphone(s)To wall jack
2 3

Operating (Continued)
HandsetJack
ThehandsetjackonthesideofRemoteMixC+allowsyouto
plug in a telephone handset and quickly set up a call before
you set up your microphones and headphones. The
handset microphone volume is adjusted using the Line In
knob. The earpiece volume is adjusted using the
Headphonelevel knob.Alltelephonehandsetsaredifferent,
so if yours is not compatible, try an AT&T, Sony, or Radio
Shack residentialphonehandset.
Keypad
The telephone keypad is for tone or pulse dialing. You may
usethekeypadatanytimeduringa callbutkeepinmind that
both transmit and receive audio are muted during a
keypress.
Tone/PulseDialing
RemoteMix C+ 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
volumecontrol knobs,the unit isin 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
pulsedialingturnthepoweroffandbackon.
PhoneLineSwitch
This switch acts as the switch-hook for the telephone line.
The Hang Up position is the normal on-hook position when
you are not using the line or you are waiting for a call. When
you want to place a call, or when a call comes in, switch to the
Dial/Talk position
Operating (continued)
Ringer
RemoteMix C+ has an internal ringer for incoming calls.
This can be turned off using the switch on the side of the
unit.
Power
RemoteMix C+ is powered by two 9 volt alkaline batteries
located 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 alkaline batteries. To test the
batteries,simplypresstheBatteryTest button on the frontof
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.
Since 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 C+ when AC power is available. Simply plug it
intothebackofRemoteMixC+andplugthetransformerinto
a110VACwalloutlet. Whenthepowerconnectorisinserted
into the jack, the batteries are bypassed. The AC adapter
doesnotchargethebatteries.
4 5

Operating (Continued)
HandsetJack
ThehandsetjackonthesideofRemoteMixC+allowsyouto
plug in a telephone handset and quickly set up a call before
you set up your microphones and headphones. The
handset microphone volume is adjusted using the Line In
knob. The earpiece volume is adjusted using the
Headphonelevel knob.Alltelephonehandsetsaredifferent,
so if yours is not compatible, try an AT&T, Sony, or Radio
Shack residentialphonehandset.
Keypad
The telephone keypad is for tone or pulse dialing. You may
usethekeypadatanytimeduringa callbutkeepinmind that
both transmit and receive audio are muted during a
keypress.
Tone/PulseDialing
RemoteMix C+ 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
volumecontrol knobs,the unit isin 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
pulsedialingturnthepoweroffandbackon.
PhoneLineSwitch
This switch acts as the switch-hook for the telephone line.
The Hang Up position is the normal on-hook position when
you are not using the line or you are waiting for a call. When
you want to place a call, or when a call comes in, switch to the
Dial/Talk position
Operating (continued)
Ringer
RemoteMix C+ has an internal ringer for incoming calls.
This can be turned off using the switch on the side of the
unit.
Power
RemoteMix C+ is powered by two 9 volt alkaline batteries
located 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 alkaline batteries. To test the
batteries,simplypresstheBatteryTest button on the frontof
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.
Since 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 C+ when AC power is available. Simply plug it
intothebackofRemoteMixC+andplugthetransformerinto
a110VACwalloutlet. Whenthepowerconnectorisinserted
into the jack, the batteries are bypassed. The AC adapter
doesnotchargethebatteries.
4 5

The receive side of RemoteMix C+ has a hidden fine tuning
control which is adjusted by inserting a screwdriver into the
backoftheunitjustbelowthewordsNullAdj.andturningleft
or right. This is a ten-turn potentiometer. This adjustment
controls the amount of transmit audio that appears on the
receive audio jacks. If you would like to adjust the mix of
transmit and receive audio on these jacks, you can fine tune
using this control. The null circuit matches the
characteristics of RemoteMix C+ with the characteristics of
thetelephoneline. Althoughmuchofthetransmit audiocan
beremoved,thisis not the equivalentof amix-minus output.
The amount of transmit/receive isolation will depend on the
qualityofthetelephoneline. Thiscircuitisfactorysettogive
an equal mix on an average telephone line, and is therefore
perfectforrecordingbothsidesofatelephoneinterview.
To find the absolute null for any telephone line, follow this
procedure:
1. Placeacalltoaquietlocation.
2. Send a signal down the line at moderate levels, this
can be a prerecorded tape of music or speech, or a
testsignal.
3. Connect the From Phone line output to a meter or
scope, or listen to the receive signal over the
headphones. Be sure to turn up the Line Out or
Headphones volume control depending on which
methodyouareusingtomonitorthereceivesignal.
4. On the back of RemoteMix C+, 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.
HybridNullAdjustment (optional) Hybrid Null Adjustment (continued)
The goal is to adjust the null signal until the receive signal
contains a minimum amount of transmit audio. If, on the
other hand, 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.
5. FactorySetting:
To reset to the factory setting, set the phone line
switch to On-Hook, and then adjust to find the null.
We have installed a terminating resistor in the On-
Hook position that simulates the average phone line
connection and gives the right mix of transmit and
receiveaudio.
The best tools for this task are 1) and oscilloscope connected
to the receive line output, and 2) a 1 kHz sine wave generator
connected to the send line input. However, the above
procedure will work with a little patience.
6 7

The receive side of RemoteMix C+ has a hidden fine tuning
control which is adjusted by inserting a screwdriver into the
backoftheunitjustbelowthewordsNullAdj.andturningleft
or right. This is a ten-turn potentiometer. This adjustment
controls the amount of transmit audio that appears on the
receive audio jacks. If you would like to adjust the mix of
transmit and receive audio on these jacks, you can fine tune
using this control. The null circuit matches the
characteristics of RemoteMix C+ with the characteristics of
thetelephoneline. Althoughmuchofthetransmit audiocan
beremoved,thisis not the equivalentof amix-minus output.
The amount of transmit/receive isolation will depend on the
qualityofthetelephoneline. Thiscircuitisfactorysettogive
an equal mix on an average telephone line, and is therefore
perfectforrecordingbothsidesofatelephoneinterview.
To find the absolute null for any telephone line, follow this
procedure:
1. Placeacalltoaquietlocation.
2. Send a signal down the line at moderate levels, this
can be a prerecorded tape of music or speech, or a
testsignal.
3. Connect the From Phone line output to a meter or
scope, or listen to the receive signal over the
headphones. Be sure to turn up the Line Out or
Headphones volume control depending on which
methodyouareusingtomonitorthereceivesignal.
4. On the back of RemoteMix C+, 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.
HybridNullAdjustment (optional) Hybrid Null Adjustment (continued)
The goal is to adjust the null signal until the receive signal
contains a minimum amount of transmit audio. If, on the
other hand, 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.
5. FactorySetting:
To reset to the factory setting, set the phone line
switch to On-Hook, and then adjust to find the null.
We have installed a terminating resistor in the On-
Hook position that simulates the average phone line
connection and gives the right mix of transmit and
receiveaudio.
The best tools for this task are 1) and oscilloscope connected
to the receive line output, and 2) a 1 kHz sine wave generator
connected to the send line input. However, the above
procedure will work with a little patience.
6 7

Specifications
Inputs:
Line: Connector RCAphonojack
InputImpedance 50kohms
Level 250mVRMS
Microphone: Connector FemaleXLR
InputImpedance 1000ohms
Mic/Line: LineswitchonMic1=-30dB
Handset: Modular4pin/4wirehandsetjack
Electret/dynamicmicrophonebias.
Outputs:
Line: Connector RCAphonojack
OutputImpedance 50ohms
Level 250mVRMS
Balanced: Connector MaleXLR
OutputImpedance 200ohms
Level 500mVRMS
Headphone: Connector 1/4"stereojacks
OutputImpedance 8 o h m s ,
nominal
Power 1wattperchannel
PhoneLine: Connector RJ11C
Isolation 1500volts
Ringer(REN)1.2B
Keypad: DTMF(DualToneMulti-Frequency)
Pulse Dialing
FCC Registration
Your new JK Audio product has been registered with the
FederalCommunications Commission(FCC). This product
complieswiththestandardsinPart68oftheFCCrules.
1. Connection and use with the nationwide
telephonenetwork
The FCC requires that you connect this telephone
equipmentto thenationaltelephone networkthrough
aUSOCRJ-11Cmodulartelephonejack.
This equipment may not be used with Party Line
ServiceorCoinTelephoneLines.
Thisequipmentishearingaidcompatible.
2. Informationforthetelephonecompany
Upon request from your local telephone company,
youarerequiredtoprovidethefollowinginformation:
a) The "line" to which you will connect the telephone
equipment(thatis,yourtelephonenumber),and
b) The telephone equipment's FCC registration
number. This can be found on the bottom of your
telephoneequipment,and,
c) the ringer equivalence number (REN) for this
equipment.
The REN is used to determine the quantity of devices
which will be connected to the telephone line. Excessive
RENs on the telephone line may result in the devices not
ringing in response to an incoming call. In most, but not all
areas, the sum of the RENs should not exceed 5.0. To be
certain of the number of devices that may be connected to the
line, as determined by the total RENs, contact the local
telephone company.
8 9

Specifications
Inputs:
Line: Connector RCAphonojack
InputImpedance 50kohms
Level 250mVRMS
Microphone: Connector FemaleXLR
InputImpedance 1000ohms
Mic/Line: LineswitchonMic1=-30dB
Handset: Modular4pin/4wirehandsetjack
Electret/dynamicmicrophonebias.
Outputs:
Line: Connector RCAphonojack
OutputImpedance 50ohms
Level 250mVRMS
Balanced: Connector MaleXLR
OutputImpedance 200ohms
Level 500mVRMS
Headphone: Connector 1/4"stereojacks
OutputImpedance 8 o h m s ,
nominal
Power 1wattperchannel
PhoneLine: Connector RJ11C
Isolation 1500volts
Ringer(REN)1.2B
Keypad: DTMF(DualToneMulti-Frequency)
Pulse Dialing
FCC Registration
Your new JK Audio product has been registered with the
FederalCommunications Commission(FCC). This product
complieswiththestandardsinPart68oftheFCCrules.
1. Connection and use with the nationwide
telephonenetwork
The FCC requires that you connect this telephone
equipmentto thenationaltelephone networkthrough
aUSOCRJ-11Cmodulartelephonejack.
This equipment may not be used with Party Line
ServiceorCoinTelephoneLines.
Thisequipmentishearingaidcompatible.
2. Informationforthetelephonecompany
Upon request from your local telephone company,
youarerequiredtoprovidethefollowinginformation:
a) The "line" to which you will connect the telephone
equipment(thatis,yourtelephonenumber),and
b) The telephone equipment's FCC registration
number. This can be found on the bottom of your
telephoneequipment,and,
c) the ringer equivalence number (REN) for this
equipment.
The REN is used to determine the quantity of devices
which will be connected to the telephone line. Excessive
RENs on the telephone line may result in the devices not
ringing in response to an incoming call. In most, but not all
areas, the sum of the RENs should not exceed 5.0. To be
certain of the number of devices that may be connected to the
line, as determined by the total RENs, contact the local
telephone company.
8 9

FCC Registration (continued)
3. RepairInstructions
If it is determined that your telephone equipment is
malfunctioning, the FCC requires that it not be used
and that it be unplugged from the modular outlet until
the problem has been corrected. Repairs to this
telephone equipment can only be made by the
manufacturer or its authorized agents or by others
who may be authorized by the FCC. For repair
procedures,followtheinstructions outlined under the
warrantysectionofthemanual.
4. Rightsofthetelephonecompany
If telephone equipment is causing harm to the
network, the telephone company may temporarily
discontinue your telephone service. If possible,
they'll notify you before they interrupt service. If
advanced notice isn't practical, you'll be notified as
soon as possible. You'll be given the opportunity to
correct the problem, and you'll be informed of your
righttofileacomplaintwiththeFCC.
Your telephone company may make changes in its
facilities, equipment, operations or procedures that
could affect the proper functioning of your JK Audio
product. If such changes are planned, you'll be notified
by your telephone company.
FCC Part 15 Compliance
This equipment has been tested and found to comply with
the limits for a Class A digital device, pursuant to Part 15
of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when
the equipment is operated in a commercial environment.
This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in
accordance with the instruction manual, may cause
harmful interference to radio communications. Operation
of this equipment in a residential area is likely to cause
harmful interference in which case the user will be
required to correct the interference at his own expense.
Changes or modifications not expressly approved by JK Audio
can void the user's authority to operate the equipment.
10 11

FCC Registration (continued)
3. RepairInstructions
If it is determined that your telephone equipment is
malfunctioning, the FCC requires that it not be used
and that it be unplugged from the modular outlet until
the problem has been corrected. Repairs to this
telephone equipment can only be made by the
manufacturer or its authorized agents or by others
who may be authorized by the FCC. For repair
procedures,followtheinstructions outlined under the
warrantysectionofthemanual.
4. Rightsofthetelephonecompany
If telephone equipment is causing harm to the
network, the telephone company may temporarily
discontinue your telephone service. If possible,
they'll notify you before they interrupt service. If
advanced notice isn't practical, you'll be notified as
soon as possible. You'll be given the opportunity to
correct the problem, and you'll be informed of your
righttofileacomplaintwiththeFCC.
Your telephone company may make changes in its
facilities, equipment, operations or procedures that
could affect the proper functioning of your JK Audio
product. If such changes are planned, you'll be notified
by your telephone company.
FCC Part 15 Compliance
This equipment has been tested and found to comply with
the limits for a Class A digital device, pursuant to Part 15
of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when
the equipment is operated in a commercial environment.
This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in
accordance with the instruction manual, may cause
harmful interference to radio communications. Operation
of this equipment in a residential area is likely to cause
harmful interference in which case the user will be
required to correct the interference at his own expense.
Changes or modifications not expressly approved by JK Audio
can void the user's authority to operate the equipment.
10 11

Warranty
RemoteMix C+ is covered by a 2 year warranty to be free
from defective workmanship and materials. In the event
thattheRemoteMixC+needsrepair,youmustcallustoget
an authorization, and then carefully pack and ship it to us.
Youwillpayforshippingtousandwewillpayforreturnback
to you, UPS ground. No free repairs will be made if the
defect was caused by misuse, weather conditions, or other
cause, except for defective workmanship or materials.
THERE ARE NO EXPRESS OR IMPLIED WARRANTIES
WHICH EXTEND BEYOND THE WARRANTY HERE
MADE.
6/00
JK Audio, Inc.
2701 N. 45th Road, Sandwich, IL 60548 [phone]