Product Support for: Universal Panel, IR & Radio Receivers -> Simplex Radio Equipped/IR Receiver Panel (UR91)

Simplex Radio Coverage One UR91 should provide full coverage for a typical model railroad under most circumstances. Simplex Radio reception is affected by metal objects between the throttle and UR91 simplex receiver, or large metal objects adjacent to the receiver; a furnace is one example of such an object. Such objects cause a second reflected signal, impairing the radio throttle signal's ability to reach the UR91. In this case, the receiver gets the signal directly from the throttle, then another signal right on top of it from the reflection. Moving the UR91 to another location may solve this problem, or you ...

Q: Where do I locate UR91 for best performance? A:  The UR91 works best in simplex radio mode if it is mounted in a central location on or near the ceiling. A few layout configurations may require a second UR91 for best performance.If the UR91 is also to be used in IR mode, then the recommendations for the UR90 should be followed.

Can a UR91 be returned and upgraded to a UR92? No. Our recommendation is that when upgrading to the DT402 throttle, the layout owner purchase a new UR92, but keep the UR91 installed for those who still have the simplex radio throttles. That way anybody can run on the layout.

Here at the Tech Support Depot, it has been our goal to improve operators' understanding of the Digitrax system of model railroad command control. We often see thoughtful words from others who are not employed by Digitrax that still have an in-depth understanding of the product line. Here, Doug Stuard talks about the UR91; these words originally appeared on the Yahoo Groups Digitrax discussion list, and are used here with his kind permission. UR91 and Throttle Antenna The UR91 antenna is the pair of 3" wires that sprout from the PC board that are arranged in a "V" similar to ...

Q:  I noticed a little black button on the circuit board of the UR91. What is it for? A:  The push button is a diagnostic tool for Digitrax technicians and it cannot be used by the user for anything.

  Q:  Can I mix UP-5s with Radio and IR panels? I want to upgrade slowly and still use the 400 throttles and the UT throttles while I mail them in to you one at a time for conversion to radio. A:  Yes, and you can continue to use the UP5's after conversion to radio; for instance, if you have visitors who bring their own Digitrax non-radio throttles. That's the real genius of LocoNet, since you can add to your railroad in any way. Note that you will need to plug in your throttle to LocoNet initially to select the locomotive before you ...

Follow these simple instructions to determine the best location/s on your layout for installing your UR panels for the best possible infrared or radio reception. With LocoNet, you can use Infrared, Duplex Radio and Simplex radio individually or in any combination on your layout.You'll need to be able to observe whether your command station is receiving commands from the UR panels when you are installing infrared or radio receivers and transceivers.  Your Digitrax command station makes it easy to determine when the system is receiving a signal and when it is not.  You can observe the NET LED and the Track Status Indicator or your ...

The following chart indicates: Which Digitrax throttle (DT400, DT400R, DT402, DT402R, DT402D, DT500, DT500D, DT602, DT602D, UT4, UT4R, UT4D, UT6 & UT6D) Works with which LocoNet interface throttle panel (Universal Panel-UP3/UP5/UP7, UR90, UR91, UR92, and UR93) Under which types of communication (Tethered, IR Mode, Simplex Radio, or Duplex Radio). Throttle Interface Chart Throttle UP Panel Tethered UR90 Tethered UR90 IR Mode UR91 Tethered UR91 IR Mode UR91 Simplex Radio UR92 Tethered UR92 IR Mode UR92 Duplex Radio UR93 Duplex Radio DT400 Yes Yes Yes Yes Yes No Yes Yes No No DT400R Yes Yes Yes Yes Yes Yes Yes Yes ...

The ability of a variety Digitrax throttles to work together on layout equipped with a variety of wireless technologies is part of the beauty of LocoNet.  With LocoNet, it is simple to add components to the system and have all of them work together. Digitrax infrared throttles will operate on any layout equipped with UR90 infrared receivers, UR91 simplex receivers and/or UR92 duplex transceivers.  All of these panels are equipped with infrared receivers.  All current model Digitrax throttles have infrared emitters that will work wirelessly with any panel that has an infrared receiver.  All current Digitrax throttles can also be used ...

Adding duplex radio, infrared or simplex radio to your existing Digitrax system is simple because of LocoNet.InfraRedYou probably already own a DT300, DT400, UT4 or DT402 series throttle. All of these are "InfraReady." These all come with two IR emitters pre-installed. All you have to add for IR operation is one or more UR90 Infrared Receivers to your layout. Most layouts require multiple UR90s because the infrared signal is line of sight. This means that your receiver will need a sight path to the throttles.Simplex RadioDigitrax throttles with an "R" at the end of the part number are simplex radio ...

There are two throttles in the "300" series: The DT300 connects into LocoNet by a 7' cable. The cable allows flexibility in movement. The throttle can be disconnected to move to another point on the layout and reconnected to LocoNet without losing the acquired locomotive. The unit will also work wireless using Infrared signals when used with either a UR90 or UR91 or UR92.   The DT300R is a simplex radio control throttle with a 1' cable to connect into LocoNet. The throttle is plugged into LocoNet to select a locomotive or to program a locomotive and then can be disconnected ...

Can I add Radio and IR to my Big Boy?Yes.Adding radio and/or IR to Big Boy is the same as adding it to any other existing Digitrax layout or Digitrax Starter Set. Digitrax offers InfraRed, Duplex Radio and Simplex Radio systems for wireless operation. Any combination of these wireless methods can be used on the same layout at the same time.Infra Red Wireless OperationAll current Digitrax throttles are Infrared capable (InfraReady) in that they come from the factory equipped with the IR emitters required to send IR information to LocoNet. To use this functionality, you only need to add one ...

The DT300 is “InfraReady”. The DT300R can operate tetherless on radio or “infraReady.” Both units are also provided with a cable to attach into LocoNet when required. A 9 volt battery must be used to power both the DT300 and DT300R for tetherless operation. Using DT300 as a tetherless throttle is easy:1. For Infrared operation, plug in at least one Digitrax IR receiver (UR90 or UR91) to your working LocoNet. Because infrared signals are line of sight, more than one receiver may be necessary for optimal performance in your layout room. 2. For Radio operation, plug in at least one ...

The DT400 and DT400R are full function hand held throttles that include 2 independent throttles and a common keypad to control up to 13 functions (0-12), turnouts and programming.The DT400 offers wireless infrared remote operation used in conjunction with a UR90 or UR91 Receiver Unit.  The DT400 requires a 9 volt battery for infrared operation; the DT400 does not require a battery in normal walkaround operation. If you do not install a battery, the throttle display will be off while you are unplugged from the system. The DT400R offers wireless radio remote operation when used in conjunction with a UR91 ...

  Can I add Radio and IR to my Zephyr Xtra?Yes.Adding radio and/or IR to Zephyr and Zephyr Xtra is the same as adding it to any other existing Digitrax layout or Digitrax Starter Set. Digitrax offers InfraRed, Duplex Radio and Simplex Radio systems for wireless operation.  Any combination of these wireless methods can be used on the same layout at the same time.Infra Red Wireless OperationAll current Digitrax throttles are Infrared capable (InfraReady) in that they come from the factory equipped with the IR emitters required to send IR information to LocoNet.  To use this functionality, you only need to ...

What is the difference between Simplex and Duplex wireless operations and what are the advantages of each?The Digitrax DT400R, DT402R and UT4R throttles operate at the 916.5Mhz radio frequency.  These throttles both use the UR91 for radio communication.  The DT402D and UT4D operate at 2.4Ghz.  They require the UR92 for radio communication. The move to Duplex is meant to improve radio operations and add radio range.  Simplex (UR91) and Duplex (UR92) can operate on the same layout without any issues or interference with each otherWith duplex radio: You’ll select and run your locomotives without plugging in.   You'll dispatch locomotives ...

DT400R is a radio equipped throttle. To use your DT400R as a radio throttle, you will need to install a radio receiver on your layout. All DT400s are “InfraReady.” This means that your DT400 comes with IR LEDs that will send infrared signals to the layout. To use this InfraReady capability, you just need to install one or more infrared receivers on your layout. A 9 volt battery must be used to power the DT400/R for tetherless operation. Using DT400/R as a tetherless throttle is easy: 1. For Infrared operation, plug in at least one Digitrax IR receiver (UR90 or ...

  I have an "M" shaped 250 square foot layout with 500 feet of track and twelve locomotives. What Digitrax equipment would I need? You don't say what scale this railroad will be modeled in, which is important since the locomotives in smaller scales draw less current than larger decoders. However, for purposes of estimation: Twelve Locomotives. Each locomotive is going to draw, at the very least, 5 MA for the decoder. If it has LED lights, then it will typically draw 15 MA more; conventional light bulbs will draw 50 MA. A typical H0 locomotive will draw 600 MA ...

Q:  If you buy the infra ready set and down the road want to upgrade to the radio is it necessary to buy a whole new set? If not what is required to upgrade the existing set? A:  The DT400 or DT402 can be converted to DT402D duplex radio or DT402R simplex radio.  The conversion must be done by Digitrax. If you plan on using the IR features of the DT400 or DT402 , you will need one or more UR90 infrared receivers.If you convert the DT400 or DT402 to duplex radio, you will need a UR92 duplex transceiver which handles both infrared ...

Your DT300 has two infrared LEDs in the cable end of the throttle case. These emitters send infrared signals that can be used by LocoNet compatible Infrared receivers such as UR90, UR91 & UR92 to give you tetherless operation via infrared signals.

This section discusses the installation of the physical wiring of the Texas & Southwestern. Underneath the completed Texas & Southwestern are various wires and cables which allow you to operate your railroad. Initially, seeing all these wires can be intimidating, but as you will note, they have been grouped and bundled so that identifying the individual wires is easy. There are two groups of wires under the railroad; one group, the power bus, delivers power to the tracks and to the stationary decoders that operate the track switches. The other group of wires is the black cable for LocoNet and ...

The jacks on the front and sides of the UP5, UR92, UR91, UR90, and LNRP front panels are Throttle Jacks and should only be used for connecting throttles to LocoNet.  They should not be used to connect to other LocoNet devices.  The jacks on the back of these units are LocoNet Jacks that are used for connecting LocoNet devices to the network.  Technically speaking! These units were designed to have the FRONT jack's second Railsync differential signal run as a diode-or'ed power source (for throttles).  This means that some cable orientations and power loads could cause unexpected operations in downstream LocoNet devices ...

  This document outlines the power requirements for Digitrax LocoNet accessories.  To simplify wiring, Digitrax recommends providing individual power supplies for like accessories.  For example a power supply or power buss which only powers the PM42s.  A power supply or power buss used solely to power multiple DS64s.  UR9x and UP5 panels can be daisy chained provided adequate current is provided to properly power all the panels.  Through the use of individual power supplies, the chance of Ground Loops or sneak paths back to ground is minimized.  Using individual power supplies will also make troubleshooting much easier.  Many Digitrax LocoNet ...

Q: I connect my DT400 to my DCS100 and it works fine, but when I add a DB150 working as a booster the DT400 stops working. What is wrong? A: A number of things may cause this, so you can use the diagnostic features of the DT400 to solve this problem. Experience has proven that the most common LocoNet problem is related to pins 3 and 4. By following this diagnostic procedure, you can narrow down to the source of the problem. Starting with DT400 without a battery [The throttle has no battery for this test to assure it executes ...

This article stops in a strange place??  We need to find the rest of it and split it up into meaningful chunks.  Also needs meta stuff Troubleshooting in General:Regardless of the guides, manuals, tips, suggestions, experts or whatever, troubleshooting can occasionally degenerate into a vast chasm of darkness and confusion.  It would be impossible to cover all the areas that have, can or may cause problems. This is a general guide to identifying and resolving problems with Digitrax Complete Train Control.  Keep Good Records:Although it may seem to be a pain while setting up your Digitrax system, keeping layout records ...

How Many UR90 Infrared receivers will I need?One UR90 should provide complete coverage if your room is typical, with a hard surface floor and finished walls and ceiling. However, several things can cause the need for additional UR90s, such as: larger room, odd shaped room, acoustical ceiling, carpeted floors, or book shelves or other things on the walls that can interfere with the infrared signal. How many more you'll need depends on how many of these "impediments" are in your layout room. This Infrared signal should be considered to be line-of-sight, but the IR signal does reflect off of other objects, thus the concern ...

If you are operating in a show environment where there are other model railroads operating which use Digitrax wireless throttles, you must insure that your railroad's LocoNet ID is different from others that are also present. Your throttle will log on to the LocoNet ID offered by compatible infrared or radio receiver it sees when plugged in to LocoNet. The default LocoNet ID is 00. It may be necessary to change the LocoNet ID if more than one club is operating in close proximity at a train show so that the commands sent by one club will not interfere with ...

The 5 Amp DCS100 and the 8 Amp DCS200 share the same front panel layout. There is a variety of indicators, switches and connectors: Power Input The two POWER IN terminals on all Digitrax boosters & command stations are the power input connections. Power On Indicator This green LED indicates that the power to the DCS100 is on. Ground Terminal The terminal marked ground provides electrical safety features and an RF ground reference for minimum radiated noise. This should be the ONLY point of any DCS100 installation that is connected to the AC safety ground pin provided on most 3 ...

These instructions will get you up and running quickly. A full description of all controls and technical reference information are included later in this section of the Tech Support Depot. This section assumes that you are using a new set straight out of the box. If your set is radio equipped, we recommend that you follow this quick start guide without using radio to learn the basics. When you are successfully running your radio throttle tethered to the system, then go to the DT400 series tetherless overview article to learn how to install the radio option. Connect the DB150 to the ...

I am putting the finishing touches on my 10 x 20 foot H0 railroad. It is a copy of the Cajon Pass, Salt Lake & Santa Fe RR by John Armstrong (#86 in the 101 Track Plans by Linn Westcott) [Kalmbach Publishing, ISBN 0-89024-512-6; still in print]. I have decided to go with DCC and my local hobby store recommended Digitrax. The layout is in my basement, I will be the only operator, the plan has 54 track switches (34 NJ International twin coils and 20 Tortoise turnout motors). Can you give me an idea as to what equipment I ...

Digital Command Control (DCC) has specific electrical requirements that must be provided for your layout control system to operate properly.Input PowerAll DCC systems require an external power supply.  Digitrax manufactures several power supplies for our command stations and boosters: The 3 Amp PS415 (the Zephyr Xtra power supply) The 5 Amp PS515 for all Digitrax 5 amp command stations and boosters The powerful 20 Amp PS2012 can be used for multiple 5 and 8 amp command stations and boosters  Additionally, the PS14 is available to power various other devices for your railroad.  Digitrax strongly encourages you to use our power supplies to insure satisfactory ...

Digitrax Complete Train Control By Zana & A.J. Ireland Digitrax Complete Train Control makes reliable, realistic train operation and simplified layout wiring a reality. Digital Command Control is incorporated within the Digitrax system to let you control multiple trains independently on the same section of track without blocking. In the real world, engineers control the speed and direction of real trains. Engines operate under their own power independent of the track. Each engine has its own motion characteristics like how fast it speeds up (acceleration) and how long it takes to slow down (deceleration). A locomotive's performance is influenced by ...