Fortress Technologies Fortress Micro Dépliant

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FCC Information:  FCC ID:  KH8-T2000 - This device complies with Part 15 of the Rules.  
Operation is subject to the following two conditions:  (1) This device may not cause harmful 
interference, and (2) this device must accept interference received, including interference that 
may cause undesired operation. 
 
PACKAGE CONTENTS: 
1. 
FMA Direct Fortress micro series AM or FM, 8 channel, Universal PPM receiver 
2. 
Dealer or factory-installed channel crystal (if purchased with unit) 
3. Owner's 
Manual 
4. 
Programming Quick Reference 
 
PREPARATION: 
 
 
AM VERSION COMPATIBILITY 
Fortress micro AM version receivers are compatible with any AM transmitter set up on the 
same frequency as your Fortress micro AM receiver.  All Fortress micro receivers support full 
crystal interchangability using FMA Direct low-profile Fortress micro series crystals.  Contact 
your local FMA Direct dealer or call FMA Direct to obtain the correct Fortress micro series 
crystal for operation with your transmitter frequency. 
 
 
FM VERSION COMPATIBILITY - PROGRAMMING THE FORTRESS MICRO FOR 
OPERATION WITH YOUR FM TRANSMITTER 
1. 
Designed for the utmost in reliability and compatibility, the new series of receivers from 
FMA Direct are the first to incorporate user-programmable FM shift compatibility with 
any standard FM/PPM  transmitter currently being sold.  User programmable through 
a series of 5 dip switches, the same receiver can now operate with positive or 
negative FM shift transmitters.  So if you have a Futaba and a JR transmitter with you 
at the field on different R/C channels, and one channel is already in use, you can 
simply plug in the correct receiver crystal, change the settings of the dip switches 
using a small screw driver and you’re ready to fly! 
2. 
In general, 72 MHz Fortress micro series receivers are shipped compatible with 
“negative”, Futaba type frequency modulation (FM) - also termed “high-going-low” 
modulation.  JR and Airtronics transmitters incorporate “positive” or “low-going-high” 
frequency modulation.  At Ham band (50 and 53 MHz), all current R/C transmitters 
incorporate “positive” modulation so, in general, Ham frequency Fortress micro series 
receivers are shipped compatible with “positive” modulation.  If you are using JR or 
Airtronics equipment on 72 MHz, you may need to adjust the DIP switch settings on 
the Fortress micro before the receiver will “listen” to your transmitter. 
3. 
In order to program the Fortress micro receiver to a different FM shift, refer to the 
Programming Quick Reference included with your receiver.  The DIP switches are 
located on the top of the P.C. board.  Each switch is labeled 1, 2, 3, 4, 5 and the word 
ON is identified on the other side of the switch array.  You may need to make a small 
slit in the top of the clear heat shrink case directly over the switch array to permit 
access to the individual switches.  Use a small jeweler type flat screw driver to change 
the switches from one state to another.  On the Programming Quick Reference, 
identify your transmitter brand and the frequency band of the transmitter/receiver 
combination (i.e. 72, 53, 50 MHz) on which you fly.  Correlate this information to the 
proper diagram and set the DIP switches at the positions shown.  There are only two 
settings which work.  If one setting doesn’t work, the other one will. 
 
 
INSTALLATION, POWER AND SERVO CONNECTION 
1. 
Care must be taken when installing your receiver to isolate the electronics from 
vibration.  Do this by wrapping the receiver in 3/8” thick foam rubber.  Restrain the 
foam-packed receiver using Velcro or a rubber band if necessary. 
NOTE:  FAILURE TO USE FOAM RUBBER AS DESCRIBED ABOVE DURING 
INSTALLATION VOIDS PRODUCT WARRANTY. 
 2. 
Extend the antenna to its full length.  Do not coil the antenna up or  range will be 
shortened.  If you are installing the Fortress micro in a small aircraft and you require a 
shorter antenna, you may cut off a portion of the 39.75” antenna without de-tuning the 
receiver; a unique feature of FMA Direct receivers.  Reducing antenna length will 
reduce range, however.  Proceed carefully, removing only a short amount at a time 
and be certain to ground range check the receiver with each incremental reduction in 
antenna length.  NEVER CUT THE ANTENNA SHORTER THAN 18 INCHES!    
special note to helicopter pilots concerning standard FM receivers and antenna 
placement:  FMA Direct receivers are tested thoroughly in all types of aircraft including 
helicopters.  Helicopters often create a challenge because they generate RF noise 
and heavy vibration from fast-moving parts.  In order to improve reception in a 
helicopter, it is recommended that you route the antenna of the receiver as far away 
from the tail boom as possible.  This is particularly true of carbon-fiber booms.  Nylon 
push rod material mounted to the underside of the skids provides a good channel 
through which to route the antenna. 
3. Fortress 
micro 
series 
receivers are 
compatible with all 
Futaba, JR, Hitec 
servos, Airtronics 
servos equipped with 
the new “Z TYPE” 
connectors, as well as 
other brands that use 
standard polarity 
(GROUND, PLUS, 
SIGNAL).  Fortress 
micro series receivers 
are not compatible 
with “OLD STYLE” 
Airtronics connectors 
that use reverse 
power polarity (PLUS, 
GROUND, SIGNAL). 
 
See warning below.   
 
 
WARNING:  IF YOU INTEND TO INTERFACE AIRTRONICS SERVOS THAT USE 
“OLD STYLE” (PRE-“Z TYPE”) AIRTRONICS CONNECTORS TO THE FORTRESS 
MICRO, YOU MUST UPDATE THE CONNECTOR TO THE CURRENT INDUSTRY 
STANDARD POLARITY (SEE FIGURE 1) AND PROPER INDUSTRY STANDARD 
SHELL THICKNESS. YOU MAY READILY CONVERT YOUR EXISTING “OLD 
STYLE” AIRTRONICS CONNECTORS TO CURRENT STANDARDS 1) BY 
INSTALLING APPROPRIATE ADAPTERS OR 2) BY REMOVING THE OLD 
CONNECTORS AND PINS AND REPLACING THEM WITH FMA PART NUMBER 
SEASSYJ.  EACH SEASSYJ CONTAINS ONE JR COMPATIBLE MALE SHELL 
AND 3 FEMALE PINS.  YOU WILL NEED TO CRIMP THE PINS AND SOLDER 
THEM TO THE WIRES OF YOUR EXISTING SERVO AND PLUG THEM  INTO THE 
SHELL PROVIDED.  MAKE CERTAIN THAT THE RED WIRE (+V) GOES TO THE 
CENTER PIN AS ILLUSTRATED IN FIGURE 1.  FMA WILL NOT ACCEPT 
RESPONSIBILITY FOR ANY ATTEMPT TO USE “OLD STYLE” AIRTRONICS 
CONNECTORS THAT DO NOT HAVE THE POLARITY CHANGED TO INDUSTRY 
STANDARDS. 
4. 
When hooking up servos to your receiver,  use TABLE 1 and FIGURE 1 to check its 
plug wire color orientation.  Note:  with the receiver sitting label side up, the signal lead 
(marked #3 in FIGURE 1 and color coded as in TABLE 1) must match up to the pin 
closest to the label side of the receiver.  No damage will occur by plugging a servo in 
backwards (reversing shell 180
°), but the servo will not operate.  Your Fortress  
 
Figure 1 
TABLE 1 SERVO PLUG COLOR ORIENTATION 
SERVO BRAND 
FUTABA BLK 
RED 
WHT 
JR 
BRN RED ORG 
HITEC BLK 
RED 
YLW