Operating Voltage 4.75-9.5 VDC
Operating Current Power Save Mode (COR Operation) 2.5 mA typical
Power Save Mode (VOX Operation) 10 mA typical
Repeat Operation 17.5 mA typical
Average w/COR Power Save (80-10-10 cycle) <5 mA
Average w/COR Power Save (90-5-5 cycle) <4 mA
Operating Temperature -30 - +60 C
Frequency Response 300-3000 Hz
Input Impedance >45 k
Input Level (TX) 0.05-2.5 VPP
Input Level (RX) 0.05-2.5 VPP
Audio Output Impedance < 1200 Ohm
INSTALLATION OVERVIEW
1. Test the radio for functionality.
2. Program the SVR per the Product Programming Section of this manual.
3. Install the SVR into the radio per the Hardware Installation Section of this manual.
4. Program the radio per the Radio Programming Section of this manual.
*** Midian is not responsible for any damage/loss resulting from the use of Midian’s products.
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GENERAL INFORMATION
Midian’s SVR-1 is a simplex repeater maker that can be installed into a mobile or portable radio. The SVR-1
detects COR or VOX from an incoming transmission and records the incoming audio (up to 3 minutes). When the
COR or VOX is no longer detected the SVR-1 keys the radio and retransmits the recorded audio. The SVR-1
enables users to create low-cost vehicular repeaters or expand radio coverage into poor coverage areas.
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PRODUCT PROGRAMMING
Midian’s SVR-1-IC1 is programmed via Midian’s KL-4F programming interface and the MPS software. Please
reference the KL-4F manual for setup instructions of the MPS software and the KL-4F hardware. From the
product selection screen in the software, select the SVR-1-IC1 from the list and click OK.
Set the parameters of the software to fit the application. If any clarifications on a feature are required, move the
mouse cursor over the feature name until the question mark appears and right click, a definition of the feature will
be shown.
After entering the parameters, save the file by going to File - Save As. Enter the file name in the File Name block
and click Save. Saving the file will allow for quick and easy reprogramming of units.
Programming: Plug the board onto the IC1 connector on the KL-4F. Press and hold the power button on the KL4F and click “Program Unit” in the MPS software. The ACK LED on the KL-4F will faintly flash if programmed
successfully.
Reading: Plug the board onto the IC1 connector on the KL-4F. Press and hold the power button on the KL-4F
and click “Read Unit” in the MPS software.
Note: Upon power up the unit will be awake for 15 seconds before going into Power Save mode.
After programming or reading the SVR-1 turn off the unit for 3 seconds and then turn back on.
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Store on COR/Store on VOX: Select the appropriate method that the unit should use to start recording incoming
audio.
COR Hold-Up Time This sets the amount of times after a loss of COR or VOX that the unit will wait until it
retransmits the recorded audio.
VOX Settings > Sensitivity: This is a threshold detection based on the energy level in the audio.
VOX Settings > Attack Time: This sets the minimum time before the unit will detect VOX based on the sensitivity
setting.
VOX Settings > Decay Time: This sets the time before the unit will drop the VOX detection. Be certain to set this
long enough so that you do not have drop outs between words or on brief pauses.
Beep Options > Power Up: Enables a short beep sequence that takes place immediately after po wer-up.
Beep Options > Error: This beep may be triggered by any input event if programmed to do so. For example, if a
long press on the Mode Input is not assigned to a function, it may be configured to generate the error beep.
Beep Options > Mode: When using a switch to enable/disable the SVR, a medium tone followed by a high tone
will sound indicating repeat mode is enabled. When pressed again a medium tone followed by a low tone will
sound indicating repeat mode is disabled.
Beep Options > Go Ahead: Not currently used.
Beep Options > Wake Up Beep: Enables a short beep to be sent over the air immediately after PTT is pressed.
Enabling this beep is recommended when the 'Wake on VOX' feature is used. This may also be used to get the
attention of the party receiving a call.
Beep Options > Courtesy Beep: If selected, once the unit is done retransmitting the recorded audio it will
generate a courtesy tone to let others know it is done retransmitting.
Beep Options > Enable Side Tone Pin: Must be checked to get mode beeps.
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Key-Up Delay: This sets the amount of time the unit waits after keying the base station radio before it starts to
retransmit the recorded audio.
Trunking Delay Enable: Check this box if using a trunking system. This will cause the unit to hold off
regenerating the recorded audio until it has received a channel acquisition acknowledgement from the base
station radio.
Common PTT: Check this box if PTT In and PTT Out are connected to the same point.
PTT Cancels Store/Retransmit: If checked and the PTT is pressed during store/retransmit the unit will not
retransmit the incoming transmission.
Number of Retransmits: This sets how many times the unit will retransmit the last recorded audio clip.
Retransmit Interval: This sets the time interval between the retransmits set in the Number of Retransmits field.
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PTT > Active Polarity: This sets whether the unit looks for an active low or active high to cancel a
store/retransmit.
PTT > Debounce: If checked the unit will require a continuous active state for 30 msec before accepting the PTT.
Mode > Type: Select whether the switch is Momentary or Latched. In this case it should be Momentary.
Mode > Active Polarity: Select the active polarity of the mode switch. In this case it should be Low.
Mode > Debounce: If checked the unit will require a continuous active state for 30 msec before accepting the
mode change.
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COR > Active Polarity: This sets whether the unit looks for an active low or active high to start recording the
received audio.
COR > Debounce: If checked the unit will require a continuous active state for 30 msec before accepting the
COR.
PTT > Active Polarity: This sets the polarity necessary for the unit’s PTT output to key the radio.
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Audio Enable > Active Polarity: This sets the polarity necessary for the unit to enable the speaker of the radio to
pass beeps.
Trunking Delay Input > Active Polarity: This sets whether the unit needs an active low or active high indication
from the radio to indicate a trunked channel has been established.
Trunking Delay Input > Debounce: If checked the unit will require a continuous active state for 30 msec before
accepting the channel acquisition.
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Tones > Beep Volume: Adjust the slider for the desired beep volume. This level is expressed as a percentage of
max voice audio level.
Tones > Over-The-Air-Signal Modulation: Adjust the slider for the desired beep volume. This level is expressed
as a percentage of max voice audio level.
Playback > Playback Level: Not used in this application.
Playback > Transmit Level: This controls the audio level when a stored voice message is retransmitted over the
air. If the transmit level is too low or too loud, adjust this level accordingly.
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AUDIO LEVELS ALIGNMENT
This section describes how to determine and set the audio levels.
Audio Levels Overview:
To ensure the best audio quality, the SVR must be configured to match the audio levels used by the radio. The
SVR uses programmable gain amplifiers to accomplish this. Determining the gain settings for these amplifiers is
an involved process, so Midian simplified this process by developing an algorithm that requires the technician to
make only four voltage measurements. From these four measurements, all of the many internal settings are
determined.
Still, getting the best audio quality will likely require a bit of trial and error. The SVR only has control of audio
voltage levels, not input and output impedances. These impedances can dramatically influence the levels.
Voltage Measurements:
An oscilloscope and a communications test set/service monitor are required for the measurements. It is
recommended that the measurements be recorded in units of mV peak-to-peak. Each measurement must be
taken with system modulation at either 60% or 100%, but Midian recommends using 60%
1. A method for controlling transmitter modulation is required for accurate measurements in the TX mode. A
small speaker held in place near the microphone by a rubber band can serve this purpose in most cases. Use
a sine-wave generator to inject a 1000 Hz tone into the speaker. Adjust the output of the sine wave generator
so that the transmitter produces 60% of rated modulation while PTT is pressed. Note that if the audio source
(such as a speaker) is moved even slightly, the TX modulation may change significantly. Care must be taken
to avoid changing the TX modulation while taking the measurements
2. Using a service monitor send a fully quieting signal (-50 dBm) to the receiver with a 1000 Hz tone at 60%
modulation, adjust the volume of the receiver to a comfortable listening level and measure the audio level at
the speaker using an AC coupled oscilloscope.
3. Set the radio programming software for an option board and set all parameters to accommodate the option
board then program the radio.
4. Install the unit and power up the radio, using the EXACT set up as in step 1 and while in transmit mode
measure the signal level at TP-1.
5. While in receive mode, and using the EXACT set up as in step 2, measure the signal level at TP-2.
6. In the KL3 under audio levels set the TX IN to the same level as measured in step 4, for a preliminary
adjustment set the TX OUT for the same level. Set the RX IN to the same level as measured in step 5 and for
a preliminary adjustment set RX OUT for the same level. Program the VS-1xxx.
7. Using the EXACT set up as in step1 and while in transmit mode verify the modulation is still at 60%, if not
adjust the TX OUT level accordingly.
8. While in receive mode, and using the EXACT set up as in step 2 verify the audio level at the speaker is the
same level that was measured in step 2, if not adjust the RX OUT level accordingly.
Programming the Audio Levels:
After determining the audio levels at the audio hookup points, it will be necessary to program the unit to match
these levels. In the programming software, there is a slider control on the Audio Levels Screen for each of the of
four audio hookup points. Locate the column that corresponds to the modulation and units of measurement for
each of the audio hookup points. Adjust the slider bar such that the value appearing in the appropriate column
matches what was measured as closely as possible.
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The following table shows Midian’s recommended levels in mVpp at 60% modulation for tested Icom models of
two-way radios:
Be certain to follow standard anti-static procedures when handling any of Midian’s products.
Icom F-3:
Remove W2 to open the radio’s TX path, W10 to open the radio’s RX path, and W1 to open the radio’s PTT path.
Plug the unit into the options connector located behind the rubber stopper under the battery. These instructions
are for radio serial numbers 50,000 and higher.
Icom F-4:
Remove W2 to open the radio’s TX path, W12 to open the radio’s RX path, and W1 to open the radio’s PTT path.
Plug the unit into the options connector located behind the rubber stopper under the battery. These instructions
are for radio serial numbers 50,000 and higher.
Icom F-3G, F-4G:
Open jumper C to open the radio’s TX path, jumper F to open the radio’s RX path, and Jumper D to open the
radio’s PTT path. Plug the unit into the options connector located behind the rubber stopper under the battery.
Icom F-14, F-24:
The unit plugs into the options connector under the battery. Before plugging the unit in, open jumper MIC to open
the radio’s TX path, jumper DISC to open the radio’s RX path and jumper PTT to open the radio’s PTT path.
Icom F-30, F-40:
Open jumper CP C to open the radio’s TX path, jumper CP A to open the radio’s RX path, and jumper CP B to
open the radio’s PTT path. The unit plugs into the options connector located on the main board.
Icom F-30G, F-40G:
Open jumper B to open the radio’s TX path, jumper A to open the radio’s RX path, and jumper G to open the
radio’s PTT path. The unit plugs into the first options connector (labeled as Option One) located on the main
board.
Note: Some F-30G, F-40G radios have an issue that when jumper G is cut, the radio still does not open the PTT
path. If this occurs it will be necessary to program the unit as PTT Common with a low negative logic.
Icom F-33G, F-43G:
The unit plugs into the options connector under the battery. Before plugging the unit in, open jumper C to open
the radio’s TX path, jumper F to open the radio’s RX path, and jumper D to open the radio’s PTT path.
Icom F-70, F-80:
Before installing the unit, open the radio’s TX path by opening CP-1, open the RX path by opening CP-2, and
open the PTT path by opening CP-4. The unit plugs into the options connector located on the main board.
Icom F-120, F-220:
Before installing the unit, open the radio’s TX path by opening the MIC jumper, open the RX path by opening the
DISC jumper, and open the PTT path by opening the PTT jumper. The unit plugs into the options connector
located on the main board.
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Icom F-320, F-420, F-520, F-620:
Open jumper A to open the radio’s TX path, jumper B to open the radio’s RX path, and jumper C to open the
radio’s PTT path. The unit plugs into the options connector located on the main board.
Icom F-1020, F-2020:
Open jumper MIC to open the radio’s TX path, jumper AFO to open the radio’s RX path, and jumper PTT to open
the radio’s PTT path. The unit plugs into the options connector located on the main board.
Icom F-1720, F-1820:
Open jumper “IO MIC” to open the radio’s TX path, jumper “AF OUT” to open the RX path. Additionally close CP-
37. The unit plugs into the options connector located on the main board.
For mode select, program the radio’s option button (P0-P3) as Opt 1 Momentary/Active Low.
Icom F-3G, F-4G, F-14, F-24, F-33G, F-43G, F-70, F-80, F-120, F-220, F-520, F-620, F-1720, F-1820:
For mode select, program the radio’s option button under Common > Key & Display as OPT1 Momentary/L
(Active Low).
Icom F-30G, F-40G:
For mode select, program the radio’s option button under Common>Key & Display as OPT11 Momentary/L
(Active Low). If you use the second options connector, program as OPT21 Momentary/L (Active Low).
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OPERATION
SVR Operati
on:
Repeater Enable/Disable: Press the radio key that was assigned during installation and/or radio programming.
A medium tone followed by a high tone will sound indicating repeat mode is enabled. When pressed again a
medium tone followed by a low tone will sound indicating repeat mode is disabled.
Repeat: With the SVR enabled, when the unit detects COR or VOX (depending on programming) it will record the
incoming audio transmission. When COR or VOX drops for a preprogrammed amount of time, the unit will key the
connected transceiver and retransmit the recorded audio.
TECHNICAL NOTES
Radio Compatibilit
y: Midian has taken the utmost care to ensure the option board integrates into the radio with
minimal impact to the features of the radio. However, some features may not be available in the radio when an
option board is used. If a feature is not available, please contact Midian to see if the feature can be added.
MIDIAN CONTACT INFORMATION
MIDIAN ELECTRONICS, INC.
2030 N. Forbes Blvd. #101
Tucson, Arizona 85745 USA