Comtek Communications Technology BST25-216 Low Power Communications TX User Manual Manual

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Document ID	115456
Application ID	6ZCUXdtnmerhg4r3bnlsxw==
Document Description	Manual
Short Term Confidential	No
Permanent Confidential	No
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Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	72.54kB (906703 bits)
Date Submitted	2000-09-01 00:00:00
Date Available	2000-09-22 00:00:00
Creation Date	2000-08-24 13:50:54
Producing Software	Acrobat PDFWriter 4.05 for Windows NT
Document Lastmod	2000-08-24 13:52:11
Document Title	Manual
Document Creator	Adobe Acrobat PDF Link - 32
Document Author:	Celia

EST-25 OPERATOR’S MANUAL (216 MHz)
Synthesized
Base Station
Transmitter
GOMTEK EST-25 3/‘1
(caccm 1214 z fi<
;11111~1v~11 mm L 111 1<1:1~'11 1111111 11 -1.1 1».1111>z~1—n11~‘11.11: -. 11...11..11
INTRODUCTION
EST-25 (216 MHz)
Synthesized
Base Station
Transmitter
The EST-25 216 MHz is a professional quality, low power,
auxiliary base station transmitter designed to operate in
the newly assigned 216-217 MHz band under part 95 of the
FCC regulations This transmitter operates with the
COMTEK PR—216 for higher fidelity when used in wide-band
operation. A transmitter and receiver system may be
used for personal suing, for tour guide applications,
language interpretation, and for assistive listening
applications
The BST—ZS 216 MHz also operates with the Phonak microEar
VHF in-ear receiver in the narrow band mode. This receiver is
used for totally discrete cuing and prompting, IFB for broadcast
and film production, and for other discrete applications
Page 1
OPERATING INSTRUCTIONS 3}
Equipment Placement
If the BET-25 base station is to be rack mounted, a remote
antenna must be used. The base station should be mounted
away from equipment that uses large power transformers to
reduce 60 Hz hum possibilities.
If the base station is to be used outside of a traditional rack
mounted environment, the screw-in whip antenna
should be free of any metallic objects when fully extended
(12 1/2 inches).
Special Note: When using the base station in close proximity
to other audio equipment, insure that the audio equipment is
not susceptible to RF interference. This can be accomplished
by temporarily installing the base station as per above, and
then while the base station is operating, checking all audio
outputs for uncharacteristic noise. If a problem is found,
move the base station or the remote antenna as far as possible
from the affected equipment. Should you continue to have
problems, contact COMTEK’s application engineering
department for assistance.
Remote Antenna
When the base station is rack mounted or when greater
system range is required, a remote antenna should be used.
For vehicle installation, a 1 / 4 wave roof»mount (MO-1 / 4 wave)
or (MAG-1 / 4 wave) should be used. For field or studio
applications, the COMTEK “Phase Right Antenna"
(PRA-l—l 216 MHz) is an easy-to»use high performance omni
antenna. For high gain directional yagi type antennas and
custom antennas, contact COMTEK's application
engineering department for assistance.
Please note: Do not install screw-in whip antenna ifremote
antenna is used.
Page 2
Power Requirements
The BST~25 base station is designed to be powered by 12 volts DC.
A power adaptor is furnished for use with standard 110V AC.
The on / off switch on the front panel of the base station turns
on the transmitter,
Audio Input Connections
The base station transmitter has facilities for audio input from
a mic, line, or speaker level source. The mic / line level audio
input is a transformer balanced input and requires a standard
XLR-3 male connector Unbalanced input is accomplished by
shorting pin-2 to pin-1 (audio ground), leaving pin-3 as the
audio source. Please note: when unbalanced input is used, it is
recommended that all audio input cables be kept as short as possible.
Set-up
a, Select an appropriate location for the base station in
accordance with "Equipment Placement" instructions
b. Set the “MiC/ LINE” switch, located on the back of the
base station transmitter, to the appropriate position: ”MIC"
position for low impedance microphones or ”LINE" position
for line level feed.
c. Connect the audio source or microphone to the
base station using the appropriate input. Be sure to set the
audio input level adjustment on the base station to its
full counterclockwise position.
Page 3
OPERATING INSTRUCTIONS (continued) "fl
d. Plug the adaptor into a standard AC outlet and plug
the power connector into the DC input jack of the
transmitter. Turn the display switch on the front of the
transmitter ”ON" to allow monitoring of the transmitter
frequency. Turn the main power switch on the front of the
base station to the "ON" position, The front display should
now be illuminated.
e. Mount the telescoping whip antenna in the hole on
top of the base station, rotating it clockwise until it is firmly
seated. Extend the antenna completely (12 l / 2 inches).
During normal operation the antenna indicator should not
flash. Tum on the transmitter and Verify that the antenna
indicator is not flashing. If the antenna indicator is
flashing, it is an indication that the antenna is not fully
efficient The antenna should be checked for appropriate
length, antenna elements in too close proximity to metallic
objects, or for a damaged coaxial cable to remote
antenna. Also, DO NOT install screw»in whip antenna if
remote antenna is used,
Audio Adjustments
In order to insure the highest possible transmission fidelity,
the transmitter must be modulating at least 50% with
normal speech (-3 dB on the VU metert This adjustment is
made in the following manner:
Page 4
|,/
at Insure that the audio source has been optimized for
best signal-to-noise ratio
b. The ”MIC / LINE” switch located at the back of the
transmitter should be switched to the appropriate settingt
”MIC" for mic level or weak line level input; “LINE” level
for line level input.
c. The ”LEVEL" control on the back of the base station
should be set fully counterclockwise and then, while normal
program information is present, slowly rotate the "LEVEL”
control clockwise until the VU meter on the front panel
begins to deflect. Adjustment should be made so that
normal speech or music deflects the meter mid-scale. Only
very loud speech or music should deflect the VU meter
full-scale.
Frequency Selection
The EST-25 216 MHz base station transmitter can operate on
60 channels between 216 MHz and 217 MHz. Channels 1-40
are narrow band channels for use with the Phonak microEar
receiver with 5 KHz deviation. Channels 41—60 are wide
band channels for use with COMTEK PR-216 with 10 KHz
deviation. The PR-216 will tune the Phonak microEar
channels 1-40 but with lesser fidelity, Refer to page 10 for
Channel / Frequency Chart,
Multiple Channel Operation
Simultaneous operation of more than two channels requires
coordination of the frequencies that are used to avoid
intermodulation interference.
Page 5
OPERATING INSTRUCTIONS (Continued)
To avoid this type of interference, select frequencies from one
of the standard groups (see frequency group charts on page 1 1), or
use COMTEK's frequency selection guide software to determine
appropriate frequencies. (Contact COMTEK to obtain a free
copy of the frequency selection software)
Test Tone
The EST-25 base station transmitter has an internal 400 Hz source
which is transmitted when the ”TONE" switch is enabled.
This source is intended to be used to make technical adjustments
and to verify the operation of the system. Under normal
operation the “TONE" switch should be disabled.
Speech EQ
On the back of the transmitter there is a switch labeled ”EQ”.
With this function enabled (switch up), the audio dynamics and
frequency response are processed to improve intelligibility of
speech. lfthe primary audio source is going to be speech, you
should enable this processing! If the main audio source is going
to include music information, you should disable it. You may
want to experiment to determine which position sounds most
pleasing with the program source you intend to use.
Page 6
Display On and Off
The digital display can be turned on or off using the “DISPLAY"
switch. Disabling the display reduces the current consumption of the
transmitter for battery operation. In environments where the display
could be distracting, disabling the display may also be appropriate.
When the display is disabled, the tuning controls are also disabled,
insuring the transmitter frequency is not changed inadvertently With
the display disabled, one segment is turned on as a power indicator.
Additionally, the “LOCK OUT” indicator is illuminated indicating the
tuning is disabled. The VU meter and the "ANTENNA" indicator are
unaffected.
Lock Out
After the transmitting frequency has been determined, the transmitter
tuning function can be disabled with the “LOCK OUT” switch on the
back of the transmitter This insures that the transmitter operating
frequency is not inadvertently changed. The ”LOCK OUT” indicator
(above the first numeric digit on the display) will illuminate indicat-
ing that the tuning has been disabled. When rack mounting the
transmitter this switch must be accessed from behind the rack. This
provides added protection from tampering.
Page 7
EST-25 FRONT PANEL
GDMTEK EST-25 swmssrzrp wmm
3°li EDS
ll 0 a
o DISPLAY SWITCH: This switch disables the digital display to conserve
current when used with a battery
9 TONE SWITCH: Enables / disables the internal 400 Hz test (one.
0 TUNING swrrcu: Selects the frequency on which the transmitter will
operate.
o LOCK OUT INDICATOR: Illuminates when the “TUNING” switch is
disabled by setting the ”LOCK OUT” switch (mar panel) to "ON”
6 DIGITAL FREQUENCY DISPLAY: Displays the frequency on which the
transmitter is operating
6 ANTENNA INDICATOR: Flashes when the transmitter senses a deficient
antenna condition.
0 vu METER: Dis la sthe level of audio bein transmitted. Used to
£5. Y 3
adjust the “LEV (rear panel) )control.
0 DIGITAL CHANNEL DISPLAY: Displays the channel on which the
transmitter is operating.
0 POWER SWITCH: Tums the transmitter on or off.
Page 8
W HST-25 REAR PANEL (216 MHz)
S/N'fi rec chEZBsrzs—zls
mommy
P1N|GND
P1N2nzv
mom |
LEVEL
| MIG
| l
DOMTHK Est-25 was m u en SLC w
ll ll‘ll‘.
@ LOCK OUT SWITCH: Disables the (front panel) "TUNING" switch,
locking the transmitter on one frequency.
(D no "firm JACK: Requires 12 VDC at 500 mA (Pin-1 ground, pin—2 +12
volts .
@ EXTERNAL ANTENNA JACK: BNC connector provides a standard 50
ohm RF Output for use with an external antenna.
is SPEECH ENHANCEMENT SWITCH: Enables and disables speech
enhance feature. Enable this function (switch up) for speech and disable
l it (switch clown) for music.
@ LEVEL CONTROL: This control should be adjusted to so that normal
audio deflects the VU meter to midscale.
® BALANCED AUDIO INPUT: Accepts audio from a line level or dynamic
microphone (Pin-1: ground).
(13 MIC/LINE swn'cu: Selects the desired audio input sensitivity.
Page 9
EST-25
FREQUENCY CHART
CHANNEL
NARROW BAND CHANNELS
11m use wnh 11.0an mmmEar)
FREQUENCY
216.0125 MHZ
FREQUENCY
216.7375 MHZ
216.8125 MHZ
CHANNEL
1 216. 0375 MHZ
216.8375 MHz
216 0625 MHZ
35
216.8625 MHZ
1 216. 0875 MHZ
36 2168875 MHZ
1 216.1125 MHZ 37 2169125 MHZ
216.1375 MHZ 216.9375 MHZ
216.1625 MHZ 216 9625 MHZ
216.1875 MHZ
216.2125 MHZ
216.2375 MHZ
‘i 216 9875 MHZ
15m use wi o 'm< 111 11.1m1vm)
216.2625 MHZ
41 216.0251) MHZ
42 216. 0750 MHZ
216.2875 M1121
12 143 L 216.1250 MHZ
13 216.3125 M112 1750 1/1112
14 2163375 M112
216.3625 MHZ
216.3875 MHZ
216.4125 MHZ
21 3750 MHZ
216.4375 MHZ
gm 4250 MHZ
216.5125 MHZ
216 5375 MHZ
216.5625 MHZ
216.5875 MHZ
216.6125 MHZ
216.5250 MHZ
216. 5750 MHZ
,, 216 6750 M112
1 216. 7250 M112
55W
216.6375 MHZ
216.6625 MHZ
56"
57
216.6875 MHZ
216.7125 MHZ
216 8750 MHZ
1’ {a 1712 W
17 3977 1 216925014112
216.7375 MHZ
60 1. 216.9750 MHZ
31
216.7625 MHZ
Page 10
“1 1
I 3111
EST-25
216 MHZ
NARROW BAND
FREQUENCY GROUPS
For Phonak mlcmEar
5 KHZ deviation
EST-25
216 MHZ
WIDE BAND
FREQUENCY GROUPS
For COMTEK I’ll—216
10 KHZ deviatinn
GROUP A GROUP 1
CHANNEL FREQUENCY CHANNEL FREQUENCY
1 216.0125 MHZ 216.0250 MHZ
8 216.1875 MHZ“ 44 216.1750 MHZ
12 216.2875 MHZ 46 216.2750 MHZ
26 216.6375 MH27 53 216.6250 MHZ
34 216.8375 MHZ 216.8250 MHZ
GROUP B GROUP 7.
CHANNEL FREQUENCY
CHANNEL FREQUENCY
4 216.0875 MHZ 216.0750 MHZ
10 216.2375 MHZ 216.2250 MHZ
14 216.3375 MHZ 47 216.3250 MHZ
28 216.6875 MHZ 54 216 6750 MHZ
36 216.8875 MHZ 58 216.8750 MHZ
GROUP C GROUP 3
CHANNEL FREQUENCY CHANNEL FREQUENCY
5 216.1375 MHz 43 216.1250 MHZ
12 216.2875 MHz 46 216.2750 MHZ
16 216.3875 MHZ 48 216.3750 MHZ
30 216.7375 MHZ 55 216.7250 MHZ
38 216.9375 MHZ
GROUP D
CHANNEL FREQUENCY
216.9250 MHZ
GROUP 4
CHANNEL
FREQUENCY
216.1875 MHZ
216.3375 MHZ
44
47
216.1750 MHL
216.3250 MHZ
216.4375 MHZ
49 216.4250 MHZ
216.7875 MHZ
216.9875 MHZ
Page 11
56
60
216.7750 MHZ
216.9750 MHZ
EST-25 (216 MHZ) SPECIFICATIONS
Audio Inputs:
Mic XLR, 600 ohm Balanced 40
dBV (nominal)
Line XLR, >10 k ohm Balanced 0
dBV (nominal)
Connectors:
XLR—3 Female audio input
connector for mic and line input
XLR—z Male power input 12
volts
BNC type RF output connector
Operation Indicators;
LED Bargraph VU Meter
displays audio input (modula-
tion)
Two Digit Alpha Numeric
Display shows operating
channel
Five Digit Numeric Display
shows operating frequency
Antenna Indicator displays
deficient antenna condition
Lock Out Indicator shows
tuning has been disabled
Antenna:
Telescopic antenna mounts
directly into top of transmitter
BNC RF Output connector for
optional external antenna
FCC Compliance:
Type Accepted under Part 95
Power Requirements:
12 Volts DC, 300 mA max
Frequency Response:
so Hz to 8 kHz
Audio Distortion:
Less than 1% at 80% modulation
Modulation Limiter:
Soft compressor type with high
(25 dB) linear overload protec-
tion, attack time less than 1 ms,
recovery time 10 m5
Audio Gain Control:
Greater than 40 dB
Test Tone Generatan
400 Hz 0.05% distortion
Frequency Modulation:
5 and 10 kHz deviation
RF Output Power:
Set for 100 mW for FCC Part 95
Frequency Stability:
Better than 20 ppm. digitally
synthesized, crystal controlled
Operating Frequency:
216 to 217 MHz
Harmonic and Spurious
Emissions:
Better than 55 dB below carrier
Dimensions:
6 1/z" wide x 13h" high x 5 5/5"
deep
Weight:
44 oz,
NOTE: Specifications sub|ect to change
without notice
Page 12
WARRANTY
COMTEK warranlb this produfit h) be true 1mm detecb in workmanship tirid
material under normal use and (auditions tor a pennd Of one year t'nnn date
or original purdmse‘ Items such as hatterm, lit-(Hoops, and cords am not
cuvered by the warranty Damage due to misuse, in treatment and
unauthurized modification and repairs are not covered by this warranty.
COMTEK Is not Iidble mr cunbequenhal damages. arising out US any Iaiiure
Of the equipment to pPI‘furm as inlcnded. COMIEK bhal] bear no responsibility
Ur obligalmn with respect to the manner of use at any equipment bind by Ii
COMTEK SPECIFJCALLY DISCLAIMS AND NEGATES ANY WARRANTY OE
MERCHANTABILITY OR I'ITNEss FOR A PARTICbLAR PURPOSE
or sum EQUIPMENT INCLUDING, WITHOUT LIMITATION, ANY
WARRANTY THAT THE USE OF SUCH EQUIPMENT FOR Aiw PURPOSE
WILL COMPLY WITH APPLICABLE LAws AND REGULATIONS.
Servire Policifs
Warranty repairs must be done by COMTEK. 0.in Maury Iechmcxans am
authorized to perform Warramy service on the BS v25 (Lansmiflel‘. Before
returning the 35125 for servite, a Remm Aulhnrimtinn Number Shaina
be nbinined frum the Sen'lcn' department by Lalllng 1-800—496—3463 or
I—soummz Return the unit m the iflfmry wrth the migiml or comparable
padring COMTEK mu pay {or insurance tnd ground rmim shipping rush in
the United Stams for all Wa|mnly service,
357We<127ufl Souih - Salt] aka Cm; Uinh 54115
Phone (8110) 490—3463 . FAA (sun 4846906
Web Page hnpz/ in Mt QImIL-k mm

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PDF Version                     : 1.2
Linearized                      : No
Creator                         : Adobe Acrobat PDF Link - 32
Create Date                     : 2000:08:24 13:50:54
Author                          : Celia
Producer                        : Acrobat PDFWriter 4.05 for Windows NT
Modify Date                     : 2000:08:24 13:52:11-07:00
Page Count                      : 15

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