Midian BTD-2 MOD-1272, BTD-2 Addendum Manual

Manual Revision: 2013-07-19

Covers Software Revisions:
BTD

-2: 1.0 & Higher

Covers Hardware Revisions:
UED-1: 7283C

BTD-2

Burst Tone Decoder

BTD-2 MOD-1272 Addendum

Motorola MDC-1200 ANI Mute Option

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SPECIFICATIONS

Operating Voltage 5.5-15 VDC
Operating Current 3 mA
Operating Temperature -30 - +60 C
Input Level 25-500 mV RMS
Input Impedance 100 K Ohms
Frequency Range 300-3000 Hz
SINAD Ratio < 9 dB
Burst Tone Band Width ± 1.5%
Momentary Output 200 mA
Dimensions 1.7” L x 0.84” W x 0.23” H

GENERAL INFORMATION

The BTD-2 will decode a single burst tone and give a momentary and/or latched output. If the BTD-2 MOD-1272
is purchased then the unit will look for the 1800 Hz preamble of a Motorola MDC-1200 ANI packet in order to
mute the speaker of the radio, so the packet is not heard.

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PRODUCT PROGRAMMING

Midian’s BTD-2 is programmed using the KL-4F programming interface and the MPS software. Please reference
the KL-4F manual for setup instructions of the software and hardware. From the product selection screen on the
MPS software, select the appropriate product name from the list and click OK.

Set the parameters of the product 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.

Plug the unit into the P5 connector on the KL-4F using the double-ended wiring harness included in the KL-4.
Press and hold the PTT button on the KL-4F, then press and hold the Power button and then click “Program Unit”

in the menu bar to send the file to the unit. When programming is completed the buttons can be released.
Note: The BTD-2 is a non-readable unit.

Receive Tone Frequency (Hz): In this register program the desired burst tone frequency in Hz from 300 to 3000.
Tone Detect Time: This time is programmable for 0.00 to 0.99 seconds. This is the length of time that the burst

tone must be present prior to the BTD-2 decoding the tone. Midian recommends setting this to at least 0.30 to
avoid falsing.

Repeater Hang Time: This time is programmable for 0.0 to 9.9 seconds. If set to 0.0 the Hang Time is disabled.
This sets the amount of time that the BTD-2 must see a loss of COR prior to resetting the Monitor/Squelch Output
and the PTT Hang Time Output. The purpose is to keep the repeater active, so that it does not go inactive during
a conversation.

Horn Output Time: This time is programmable for 0-9 seconds. This sets the amount of time the Horn Output will
go low.

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COR Polarity: This sets the polarity the BTD-2 looks for to see COR as active, GND (Ground) or V+ (+5 V). The
BTD-2 looks for an active COR to validate a tone, so as not to false. The unit also resets the latched outputs by
seeing COR go inactive.

Squelch Polarity: This sets the polarity of the output of the Monitor/Squelch Output, GND (Ground) or V+ (+5 V).
Monitor Input Polarity: This sets the polarity the BTD-2 looks for to open the squelch of the radio to look for

activity, GND (Ground) or V+ (+5 V). When this input goes active the BTD-2 activates the Monitor/Squelch
Output.

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