DRAKE MMTS20 User Manual
AUDIO
VIDEO
PWR
A/V
RF
CH
#
AUDIO
VIDEO
PWR
A/V
RF
CH
#
AUDIO
VIDEO
PWR
A/V
RF
CH
#
AUDIO
VIDEO
PWR
A/V
RF
CH
#
AUDIO
VIDEO
PWR
A/V
RF
CH
#
AUDIO
VIDEO
PWR
A/V
RF
CH
#
AUDIO
VIDEO
PWR
A/V
RF
CH
#
AUD
CH
#
AUDIO
VIDEO
PWR
A/V
RF
CH
#
AUDIO
VIDEO
PWR
A/V
RF
CH
#
POWER SUPPLY
O
OF
AUDIO
VIDEO
PWR
A/V
RF
CH
#
IO
MMTS20
STEREO
ENCODER
POWER
PILOT
LOCK
AUDIOLEVEL
N
TEST
TONE
OVERMOD
F
RMM4
MMTS20
STEREO
ENCODER
POWER
PILOT
LOCK
AUDIOLEVEL
ON
TEST
TONE
OVER-
MOD
OFF
MMTS20
STEREO
ENCODER
POWER
PILOT
LOCK
AUDIOLEVEL
ON
TEST
TONE
OVER-
MOD
OFF
MMTS20
STEREO
ENCODER
POWER
PILOT
LOCK
AUDIOLEVEL
ON
TEST
TONE
OVER-
MOD
OFF
MMTS20
STEREO
ENCODER
POWER
PILOT
LOCK
AUDIOLEVEL
ON
TEST
TONE
OVER-
MOD
OFF
THREE YEAR LIMITED WARRANTYTHREE YEAR LIMITED WARRANTY
THREE YEAR LIMITED WARRANTYTHREE YEAR LIMITED WARRANTY
THREE YEAR LIMITED WARRANTY
R.L. DRAKE COMPANY warrants to the original purchaser this product shall be free from defects in material or workmanship for three (3)
years from the date of original purchase.
During the warranty period the R.L. DRAKE COMPANY or an authorized Drake service facility will provide, free of charge, both parts and
labor necessary to correct defects in material and workmanship. At its option, R.L. DRAKE COMPANY may replace a defective unit.
To obtain such warranty service, the original purchaser must:
(1)(1)
(1)(1)
(1) Retain invoice or original proof of purchase to establish the start of the warranty period.
(2)(2)
(2)(2)
(2) Notify the R.L. DRAKE COMPANY or the nearest authorized service facility, as soon as possible after discovery of a possible defect,
of:
(a) the model and serial number,
(b) the identity of the seller and the approximate date of purchase; and
(c) A detailed description of the problem, including details on the electrical connection to associated equipment and the list of such
equipment.
(3)(3)
(3)(3)
(3) Deliver the product to the R.L. DRAKE COMPANY or the nearest authorized service facility, or ship the same in its original container
or equivalent, fully insured and shipping charges prepaid.
Correct maintenance, repair, and use are necessary to obtain proper performance from this product. Therefore carefully read the Instruction
Manual. This warranty does not apply to any defect that R.L. DRAKE COMPANY determines is due to:
(1)(1)
(1)(1)
(1) Improper maintenance or repair, including the installation of parts or accessories that do not conform to the quality and specifications
of the original parts.
(2)(2)
(2)(2)
(2) Misuse, abuse, neglect or improper installation.
(3)(3)
(3)(3)
(3) Accidental or intentional damage.
All implied warranties, if any, including warranties of merchantability and fitness for a particular purpose, terminate three (3) years from the
date of the original purchase.
The foregoing constitutes R.L. DRAKE COMPANY’S entire obligation with respect to this product, and the original purchaser shall have no
other remedy and no claim for incidental or consequential damages, losses or expenses. Some states do not allow limitations on how long
an implied warranty lasts or do not allow the exclusions or limitation of incidental or consequential damages, so the above limitation and
exclusion may not apply to you.
This warranty gives you specific legal rights and you may also have other rights which vary from state to state. This warranty shall be
construed under the laws of Ohio.
12 POSITION RACK UNIT POWER SUPPLY
® MMTS20 STEREO ENCODER 1
8
WARRANTY AND SPECIFICATIONS
® is a registered trademark of the R.L. Drake Company
© Copyright 2001 R.L. Drake Company P/N: 3852478D-10-2001 Printed in U.S.A.
4 POSITION
RACK UNIT
POWER SUPPLY
OR
MMTS20 and other compatible
modular units
The R.L. Drake MMTS20 is an MTS stereo
encoder which accepts left and right channel
audio input and generates a composite BTSC
format stereo signal. The composite signal is
applied to the audio input of a compatible
audio/video modulator. The modular design of
the MMTS20 permits convenient pairing with a
Drake Mini-rack fixed channel or agile type
Video Modulator in a multiple unit rack
configuration.
Rear panel left and right audio inputs allow
either balanced or unbalanced operation. The
MMTS20 must be supplied with the modulator
video in order to provide the MMTS20 with sync
information for the encoding process. A front
panel Audio Level control with corresponding
Overmodulation indicator permits setting the
proper audio input levels to the MMTS20.
A Pilot Lock indicator is provided to verify that
the encoder is properly synchronized to the
supplied video horizontal sync. A built-in audio
test tone generator, turned on or off from a front
panel switch, is provided for calibration of the
modulator Audio Input level.
As previously described, front panel controls
include Audio Level and Test Tone switch. Front
panel indicators are Power, Pilot Lock, and
Overmodulation. A rear panel 'F' type connector is provided for the video sync reference.
Left and right audio inputs are through rear
panel 3.5 mm 'stereo' type receptacles. The
composite BTSC signal output is through a rear
panel RCA type phono connector. The unit is
powered by a compatible Drake Mini-rack
power supply module.
R.L. DRAKE COMPANY
230 INDUSTRIAL DRIVE
FRANKLIN, OHIO 45005 U.S.A.
CUSTOMER SERVICE AND PARTS TELEPHONE:
+1 (937) 746-6990
TELEFAX:
+1 (937) 743-4576
WORLD WIDE WEB SITE: http://www.rldrake.com
®
MMTS20
STEREO
ENCODER
POWER
PILOT
LOCK
AUDIO LEVEL
ON
TEST
TONE
OVERMOD
OFF
F1
F2
F3
F4
F5
2
FRONT PANEL CONTROLS and INDICA TORS
Figure 1
F1 - POWER Indicator
Lights when the unit is connected to the
required source of DC power.
F2 - PILOT LOCK Indicator
Lights to indicate that a video signal is applied
to the rear panel VIDEO INPUT connector and
that the MMTS20 is locked to the video
horizontal sync.
F3 - TEST TONE Switch
Switch to the 'ON' position to enable an internal
test tone to aid system audio level setup. See
the 'Installation' section of this manual for setup
information. The nor mal position of this switch
is the 'OFF' position.
F4 - OVERMODULATION Indicator
Lights to indicate greater than 25 kHz of main
channel deviation. After system audio
modulation levels are properly set, and with left
and right audio source input, adjust the AUDIO
LEVEL control (see item F5) to a point where
the OVERMODULATION indicator just
remains off.
F5 - AUDIO LEVEL Control
The setting of this screwdriver adjustment
determines the audio input signal level. After
system audio modulation levels are properly
set, and with left and right audio signals within
the 250 mVrms to 2.5 V rms range, set this
control to a point where the
OVERMODULATION indicator just remains off
(see item F4).
SPECIFICATIONS 7
Specifications subject to change without notice or obligation.
AUDIO INPUT
Input Impedance:
Input Level:
VIDEO INPUT
Input Impedance:
Input Level Range:
COMPOSITE OUTPUT
Output Impedance:
Output Level:
STEREO PERFORMANCE
Stereo Separation:
Total Harmonic Distor tion:
S/N Ratio:
Frequency Response:
Spurious Subcarrier:
NOTE:
TEST TONE
Frequency:
Amplitude:
GENERAL
DC Power Input:
Operating Temperature Range:
Size:
Weight:
40 K Ohms balanced,
20 K Ohms unbalanced.
250 mVrms to 2.5 V, front panel adjustment.
High impedance, intended to be paralleled with paired
A/V modulator unit.
Input Level Range: 0.5 Vp-p to 2 Vp-p.
100 Ohms, intended to drive high impedance audio
input of paired A/V modulator.
10 mV/kHz, ±10%.
1.1 Vp-p for a 100% modulation signal.
Greater than 20 dB.
Less than .25%.
Greater than 65 dB.
Within ±1 dB from 40 Hz to 12.5 kHz.
-50 dBc typical.
System performance is dependant upon paired modulator.
10.396 kHz ±50 Hz.
0.5 Vp-p ±10%; all output levels are calibrated to the
level of this tone and is used to set system audio
levels for proper stereo operation. The paired A/V
modulator audio response must be set for “Flat”
(pre-emphasis defeated).
+12 V ±5% @ 150 mA
(+5 V is not required for this unit).
00 C to +500 C ambient.
1” W x 3.5” H x 7.5” D
(2.5 cm) W x (8.9 cm) H x (19.1 cm) D.
10.7 oz. (0.3 Kg).
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