M2 Antenna Systems S2 User manual

PLEASE READ BEFORE USE AND SAVE
SPECIFICATIONS
MODEL NUMBER ........................................... EME SEQUENCER S2
POWER REQUIREMENTS. ............................ 86-264VAC / 1AMP
HOT SWITCH SECURITY............................... DPDT Relay / Latching
ENCLOSURE SIZE ......................................... W=6.25”/ H=2.25” / D=8”
COLOR ........................................................... Black Anodized
RELAY CONTROL OUTPUTS ........................ (4) RX Selectable / (4) TX Selectable
No Jumper = Open Circuit (No State)
A to B Jumper = Ground (On TX)
B to C Jumper = +13VDC (On TX)
SEQUENCER DELAY ..................................... With Jumper = ~80 Milliseconds
Without Jumper = ~120 Milliseconds
CONTROLS .................................................... Power Switch / Preamp Switch / Polarity Switch
M2 Antenna Systems, Inc.
Model No: S2
Sequencer
Operating Instructions
TROUBLESHOOTING OVERVIEW
INSTALLATION
ADDENDUM
WARRANTY
M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722
Tel: [phone] Fax: [phone] Web: www.m2inc.com
©2015 M2 Antenna Systems Incoporated 06/01/15
Rev.00

FRONT & REAR PANEL OVERVIEW
I / O (POWER)
This button controls AC power to the Sequencer unit.
I / O (PREAMP)
This button controls +12VDC to control a mast mounted preamp.
V & H (POLARITY SWITCH)
This switch controls the Vertical or Horizontal Polarization to a mast mounted 24-28VDC coaxial relay.
T (PREAMP TEST SWITCH)
If an M2 preamp is used, the Noise Test feature can be operated by the “T” push button on the front panel. Noise
Test provides an approximate 10 db increase in receiver noise to verify the preamp is operating correctly.
NUMBERED SEQUENCE INDICATORS 1-4
Sequence indicators will light when the proper sequence is achieved during keying.
AC IN
The supplied (3) prong AC cord plugs into this socket. Connect to a reliable 110 VAC source. The Main AC input
and switching power supply have been designed to filter and adjust for incoming AC from (86-264 VAC).
TERMINAL STRIP
The (10) position terminal strip, serves as your multi-conductor cable interface to a tower mounted relay / preamp
system. A ground connection on terminal (10) has been provided for shielded cables.
DISCONNECT THE AC POWER CORD WHEN CONNECTING CABLE LEADS.
XCVR INPUTS (TRANSCEIVER)
In order for the S2 Sequencer to determine the difference between Transmit or Receive, it is necessary to supply
a “Keyed” state from your Transceiver. We have supplied both a “+2-12VDC” input and a “To Ground” input.
Check your Transceiver manual for the proper connections. Most modern Tranceiver’s “Key to Ground.”

EME S2 SEQUENCER SYSTEM OVERVIEW
S2 EME SEQUENCER THEORY
If you have ever blown up your new GasFET preamp or hard-to-find coaxial relay, or are just plain worried about It, this
transmit / receive Time Delay Generator/Sequencer is the answer.
The S2 Sequencers’ primary application is for VHF/UHF transverter, amplifier and antenna switching. But it can be used
in any amplifier antenna scheme. An enable signal to the sequencer will produce sequential output commands to a RX
relay, a TR relay, an amplifier and a transverter automatically, plus a polarity change lockout.
WHY USE A SEQUENCER ?
In stations using transverters, extra power amplifiers and external antenna mounted TR relays, several problems may
arise. When the exciter is switched into transmit by the PTT or VOX line, it immediately puts out a ground (or in some
cases a positive voltage) command for relay control and RF signal. If a control signal is supplied to the transverter,
amplifier and antenna relays simultaneously, RF can be applied as the relay contacts bounce. In most cases, RF will be
applied before a relay can make full closer. This can easily arc contacts on DC and RF relays and cause permanent
damage. In addition, if the TR relay is not fully closed before RF from the power amplifier is applied, excessive RF may
leak into the receive side of the relay. The likely result...preamplifier failure. The TR (Transmit/Receive) time-delay
generator supplies commands, one after another, going into transmit and going back to receive from transmit, to turn on
all station relays in the right order, eliminating the problems just described.
HERE’S HOW IT WORKS
Assume we’re in receive and are going to transmit. A customer selectable (+2 to +12VDC) or ground command to one of
the relays turns it off. This allows a capacitor to charge through a resistor raising the voltage applied to all positive inputs
through the IC. The ladder network on all negative inputs sets the threshold point of each comparator at a successively
higher level. As the capacitor charges up, each comparator will sequentially change output states. The outputs drive
transistors which are “off” in the receive mode. Drive from the gates turns these transistors “on.” This causes the
collectors of the transistors to go low, allowing the base-to-emitter junctions to be forward-biased through the (4) LED’s
to turn on the relays in sequential order. The LED’s serve as a built-in indicators to check performance and sequencing
of the generators. This is convenient if any state changes are made.
WHY OUR SEQUENCER IS DIFFERENT
M2 Inc. has looked at many sequencer concepts and has determined the biggest problem...hot switch (During Transmit)
security. We have integrated a security relay into the sequencer that DISABLES the front panel vertical / horizontal po-
larization switch when the sequencer is keyed. This security relay will save costly repairs or replacements to your high
quality RF power relays.

EME S2 SEQUENCER STANDARD SETUP
EME S2 SEQUENCER OUTPUTS
The S2 Sequencer has (4) independent relays of which (2) independent states per relay output can be selected. In the
TX (Transmit) Mode (B2-B5) jumpers can be setup for a “Open Circuit”, “Short to Ground” or “+13VDC output.” In the RX
(Receive) Mode (A5-A2) jumpers can also be setup for a “Open Circuit”, “Short to Ground” or “+13VDC output.” In the TX
(Transmit) Mode the sequence is output terminals 2-3-4-5. In The RX (Receive) Mode the sequence is output terminals
5-4-3-2. Note that in the RX (Receive Mode) that the delay starts with terminal 5 and works back to terminal 2. For
jumper format see diagram “A” below. Diagram “D” shows each jumper location for either TX (Transmit) Mode and RX
(Receive) Mode. The TX (Transmit) Mode is factory set as “To Ground” state on B2, B3, B4 and B5. Note if a situation
arises where one terminal will have a “To Ground” state and two different voltage values are tied to the same terminal,
you must install voltage steering diodes. A standard 1N4004 can be used for this application. See Diagram “C” for
information. To make any changes to the jumper selections, loosen the screws on the front and rear panel and slide the
cover forward. *A new jumper selection for “Standard” usage and “Map 65” applications has been included in the S2
Sequencer. The S2 Sequencer is shipped with the “Standard” jumper setting described in Diagram “B”.
EME S2 SEQUENCER DELAY (JP1)
The S2 Sequencer has an adjustable delay between sequencing. With the (JP1) jumper installed (factory setting) the
total delay is approximately 80-milliseconds. By removing the jumper, the total delay would change to approximately 120
milliseconds. See Diagram “D” for component location. To make a change to the time delay jumper, loosen the screws
on the front and rear panel and slide the cover forward.
JP1
A5 (RX)
B5 (TX)
A4 (RX)
B4 (TX)
A3 (RX)
B3 (TX)
A2 (RX)
B2 (TX)
Diagram “D”
A2 (TX)
+12VDC Component
+28VDC Component
Diagram “A” Jumper Designation
A B C
OPEN
A B C
GROUND
A B C
+ 12VDC
Diagram “B” Standard Jumper Designation
E F G
STANDARD
E F G
STANDARD
H I
STANDARD
J K
STANDARD
Diagram “C” Steering Diode Example
“B” “B”

EME S2 SEQUENCER MAP 65 SETUP
EME S2 SEQUENCER OUTPUTS (MAP 65)
If you are using the popular “Map 65” application, you may need an additional configured output for an isolation relay.
We have provided a secondary set of jumpers for this application on the board. In the “Map 65” configuration, the first
DPDT (RY6) relay has its contacts separated with a jumper. The constant +13VDC on terminal “1” is now activated by
the contacts of the relay. In the RX (Receive) Mode +13VDC is present. When the S2 Sequencer is keyed, the +13VDC
is removed. Terminal “2” is then used for the isolation relay in a keyed state during RX (Receive) Mode and a N.O. state
in TX (Transmit) Mode. To setup this configuration, refer to Diagram “B” for jumper settings. *Note that the jumper has
been removed from the first output marked “Open” (RY6-TX Jumper) towards the bottom right of Diagram “D”. All other
outputs for RX (Receive) Mode and TX (Transmit) Mode are handled in the same way as the standard outputs. *Please
refer to Standard setup for more details. Note if a situation arises where one terminal will have a “To Ground” state and
two different voltage values are tied to the same terminal, you must install voltage steering diodes. A standard 1N4004
can be used for this application. See Diagram “C” for information. To make any changes to the jumper selections, loosen
the screws on the front and rear panel and slide the cover forward.
EME S2 SEQUENCER DELAY (JP1)
The S2 Sequencer has an adjustable delay between sequencing. With the (JP1) jumper installed (factory setting) the
total delay is approximately 80-milliseconds. By removing the jumper, the total delay would change to approximately 120
milliseconds. See Diagram “D” for component location. To make a change to the time delay jumper, loosen the screws
on the front and rear panel and slide the cover forward.
JP1
A5 (RX)
B5 (TX)
A4 (RX)
B4 (TX)
A3 (RX)
B3 (TX)
A2 (RX)
OPEN
Diagram “D”
A2 (TX)
+12VDC Component
+28VDC Component
Diagram “A” Jumper Designation
A B C
OPEN
A B C
GROUND
A B C
+ 12VDC
Diagram “B” Map 65 Jumper Designation
E F G
STANDARD
E F G
STANDARD
H I
STANDARD
J K
STANDARD
Diagram “C” Steering Diode Example
“B” “B”