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DSL-100 Installation

  1. Preparation
    1. Remove the Circuit Board from the packaging and inspect it for damage.
    2. If you are not already, familiarize yourself with the schematic and operation of the  transmitter you are planning to install the DSL into.  This is a key step, as the DSL must be calibrated to your specific transmitter/application to ensure optimal operation.
  2. Tools Needed
    1. #1 flat blade screw driver or alignment tool
    2. Fine tipped soldering iron
    3. Electronics grade solder
  3. Additional Materials
    1. 22~26AWG wire optional (if cable provided is not used)
    2. Double Sided Tape or #2 machine screws and nylon standoff’s
  4. Pre-requisites
    1. Full understanding of how to calibrate your transmitters deviation setting.
    2. Test equipment to support the adjustment and calibration of your transmitters deviation setting.
  5. Specifications
    1. Voltage range: 10~18 VDC (12 Vdc Nominal)
    2. Current drain: 10mA typical
    3. Input impedance: 10K ohms without microphone bias enabled. 1.8k ohms with microphone bias enabled.
    4. 1 dB below output limiting is equal to 250 mV P-P at the input to the DSL (minimum input for limiting).   Resistor change needed R3, 47k to100k to change the lower limiting level to less than 100 mV .  This will lower max limiting proportionally.
    5. Dimensions: 2 2/8"  x 1-3/8" x ½" tall.
    6. Mounting: double sided tape or via #2 screw holes.

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    6.     Installation Steps

    Typically the DSL-100 is installed between the audio input and the modulation circuits of your transmitter. Note:   If used with a repeater controller that transmits a P/L tone the DSL-100 should be installed prior to the point where the P/L is injected into the transmitters modulation circuits.  The P/L Deviation should be confirmed and as necessary calibrated after the installation of the DSL-100.  Keep in mind that the calibration of the DSL should be done with the P/L circuit disabled.

   1.   Bias Jumper JP-1

If the audio input source is a microphone jumper JP-1 is typically installed. This jumper will then allow the DSL-100 to provide microphone bias voltage to support the newer style microphones.

Jumper JP-1 should be removed if the transmitter is used with a repeater controller or another non-microphone audio source.

                2. Supply Voltage

Attach the Supply voltage (10 ~ 18 VDC) to either P1 Pins 1 and 2 (6 pin header) or to P-4 Pins 1 and 2.  The supply voltage should be fused or protected against shorts.  Although the DSL-100 draws less than 10mA, if a voltage internal to your transmitter is used, please verify that it has capacity to support the additional load.

                3.  Audio Input

Attach the Audio Input to P1 pins 6 and 5 (6 pin header) or P2 pins 1 and 2.  It is recommended that you use shielded audio cable if the connection is longer than 6 inches in length or the DSL-100 is used in a high RF environment.  Typically the wire provided will work well.  Be sure to have a good ground at both ends of the audio path.

                4. Audio Output

Connect the Audio to your transmitters input modulation circuits via P1 Pins 3 and 4 (6 pin header) or P3 pins 1 and 2.  Again it is suggested that you use shielded audio cable for long connection or high RF environments.   Be sure to have a good ground at both ends of the audio path.

                5.   Mount the DSL

Utilizing the double sided tape provide or 2,  number 2 screws and nylon standoffs attach the DSL-100 to a permanent location of your choosing.  Be sure to confirm that you have not mounted it too close to a heat source or in a location where the board may be shorted out or damaged by other components, parts or wires.

                6.   Calibration

Calibrate your transmitter per your suppliers published procedure.   Write down the input level needed to drive your transmitter to achieve full limiting.
  • Install the DSL-100 and set the input audio level equal to the level noted in the step above.
  • Adjust VR-1 on the DSL-100 until the transmitter deviation is just below full limiting (no clipping or distortion of the observed waveform).  The Frequency of sine wave used for calibration is recommended to be from 4 to 5kHz.
  • Decrease the source audio level into the DSL-100 to the point where the transmitter deviation just begins to be reduced.  Note the input level required.   Confirm input level is approximately 5 times less than the maximum input noted in step #2.

This concludes the installation and calibration of the DSL-100.

Warranty:

K2RF warrants the DSL-100 to be free from functional defects for a period of 90 days from the date of purchase.  Contact K2RF should you need to return your DSL-100 for repair or replacement.

K2RF will also repair the DSL out of the warranty period for a nominal cost.

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