DT News

This page summarises changes to the DelTang product range.


Mar 2019 Rx65c
Rx65c has emerged to have a greater degree of unreliability at higher voltages than expected. So the voltage rating for this receiver is reduced to 13v. Customers may return Rx65c for a refund or exchange for Rx66c which continues to have an 18v rating. Claims should be taken up with the reseller the product was bought from.

Aug 2018 Rx65/Rx66
New version of Rx65 with same 3A current rating. New 4A Rx66 which can handle higher currents with the addition of a suitable heat sink.

May 2018 Ch5 'SOS' Programming
New way to change settings in receivers using just your transmitter added to receivers with v611 program (Rx6x receivers and Rx47). Channel 5 is used to invoke programming mode and Channel 3 then used to change settings. See the SOS instructions. Available from v611-18.

By default, Battery Voltage flashes are triggered with Ch5. This feature now requires Ch5 to be pressed for 5s to start the voltage flashes.

Feb 2018 Rx43d-6 / Rx45-6 / Rx47-6
New '-6' variants of these receivers for 'cars' to used with the same Tx2-based transmitter:
* They are intended to be used with Tx2 Profile 1 so that the throttle pot can be calibrated to match a pot with a center click (detent). The function of the Tx2 Pin6 needs to be changed to control Ch4 as described in the Tx2 instructions.
* Tx2 Profile 7 provides more channels for controlling outputs but does not have a facility to calibrate the throttle pot's center.
* Tx24 can control Motor and Steering. Selecta is available if enabled in the receiver.

All three receivers have at least one reversable motor output and Rx47 has two. The light outputs are intended for cars/trucks/etc. They all have at least six P outputs for controlling steering and lights. They are set up the same in all three receivers. Rx43d and Rx47 have extra outputs.

Feb 2018 Rx60c and Rx61d product fault
The 'L' input does not work on earlier versions of these two receivers. The affected receivers are identifed with board and software versions. The boards have '60c' or '61d' machine-printed on them. Software versions up to and including v611-13 hand-written on the Rx (eg: '11/13' means v611-13) are faulty. v611-14 and higher ('11/14') are OK.

The fault is a component placement error. If the L input is needed, receivers have to either be returned to DelTang to be fixed or fixed yourself. The fix is to swop the 10k resistor with the 0.47uF cap as shown here. This photo shows a faulty receiver and the Red text how it should be.

Jan 2018 v520 New software with DSMX for 'v5' receivers (Rx41d-x, Rx43d-x, Rx45).

New features/changes:
1. DSMX added (DSMX + DSM2 Air is available).
2. Increased the number of channels that can control outputs from 7 to 12 (Rx43d only).
3. Selecta now has 2-flash led (same as Rx6x receivers). It is visible on the Rx led and LED2 output.
4. LED2 now has an 'always on' option to mirror the Rx Led on a P output.
5. Low voltage cut (LVC) now has 5-flash led (used to be 2-flash and now same as Rx6x receivers). It is visible on the Rx led and LED2 output.

Features removed to make space:
6. 'DSM2 Surface' (for DX3).
7. 'Minimum Power' for H outputs (programming Menu 1).
8. '1 channel controls 1-4 outputs' (Menu 3, 2-flash On/Off led) which had latching time-based channel control. If used, these settings are now operated as '1 channel controls 1-2 outputs' (Menu 3, 3-flash On/Off led) which has a simpler momementary/non-latching action. Outputs still work but the controlling channel has to stay in the 'on' position for the output to stay on. This affects default settings for Rx41d-1 (P1/P2), Rx41d-3 (P2), Rx43d-1 (P5/P6), Rx43d-2 (P4), Rx43d-4 (P4), Rx45-v5 (P4), Rx45-5 (P4), Rx45-22 (P5/P6). This also means if one channel controls two outputs, only one can be on at any time. This affects Rx41d-1 (P1/P2), Rx43d-1 (P5/P6), Rx45-22 (P5/P6).

Dec 2017 v354 New software with improved DSMX control for Rx3x receivers. LVC motor cut changed from 'blips' to full cut like v344.

May 2016 Rx62b New version of Rx62. About 1mm wider and 4mm shorter.

Rx45b New version of Rx45. Motor and battery connections are slightly easier. Now uses DRV8837 H-Bridge chip.

April 2016 v3.5.3 Added two start bytes 0xfe/0x02 to the Serial output. Also changed Rx32d Serial to be 9 channel. Other receivers with v3x program still use 7 channel Serial. SumPPM remains 7ch in all receivers with v3x program.

Rx32d has up to 9ch Servo and Serial outputs but SumPPm is always 7ch. Transmitters have to transmit 'twice' to handle more than 7ch. So changing between 7 and 9ch features is likely to need rebinding with 8ch+ transmitters so both Tx and Rx are configured for the correct number of channels. More details 7/9ch Serial

March 2016 v3.5.2 Throttle failsafe added to servo and actuator receivers. Throttle position saved during binding used as failsafe position on signal loss.

November 2015 Rx65:
Some of the default settings have been changed in Rx65-1, Rx65-2 and Rx65-22. These are P9-P12 to make the receiver more suitable for controlling external sound cards.

August 2015 Rx102-U: Rx102 with coax aerial for metal bodied models.

I no longer have the capacity to build transmitters. Kits are still available and some resellers offer built transmitters.

July 2015 Rx47:
New receiver intended for surface vehicles. Only slightly bigger than Rx43d with same voltage range (3-6v) but more outputs. Also has more memory to accommodate DSM2 and DSMX and the more sophisticated 'v6' software used in Rx6x receivers. Outputs can be controlled with up to 18 channels.

A new version of Rx32d which has 18ch X-Plus for use with DSM2 and DSMX. This version only has one output which has 18ch RS232 type Serial. Same structure as other v3.5 7ch Serial but more channels.

May 2015 Rx60c | Rx61d
New versions of Rx60 and Rx61. These receivers are identical except that Rx61 is slightly wider to allow more P outputs.

Rx102 and Tx2 now available with horizontal and vertical pins.

Apr 2015 v3.5:
New software for 'servo' (Rx3x) and 'actuator' (Rx4x) receivers. This software has several new features but which cannot all be installed at the same time. The optional features are listed below with the approximate program size:

* DSMX +900 bytes
* ESC (PWM) +1300
* Brake (ADD4) +100
* Surface DSM2 +250
* Serial/SumPPM +500
* Quick Reconnect +400
* 8 or more channels +100

Various combinations of these options will be chosen as standard for receivers and shown on the DelTang home page. These will be implemented progressively and are available at any time on request. 7ch DSM2 will remain standard for all receivers. Although DSMX is optional it will also be installed as standard. 'Surface DSM2' (for DX3) will not normally be installed.

The brushed motor output (for planes) requires the 'ESC' option to be installed. The LVC (low voltage cut) part of this has been changed to make the motor 'blip' every 3s instead of cut completely. The pilot retains full control over motor power.

DSM2 uses different frequencies every time the Transmitter is switched on. At startup, the Quick Reconnect feature in the Receiver saves these frequencies so they can be found quickly if the signal is lost and recovered. The feature is not relevant to DSMX.

Feb 2015 Complex flash patterns
Rx65b and Rx47 can generate complex flash patterns or logic sequences to automate things. Examples would be Knight Rider type patterns, revolving lights say with 3 leds, Morse code SOS. 1-16 pads can be used and auto-repeating sequences up to 5.6s in duration. Two patterns can be defined. This feature is available from v611-3.

A 'Menu' capability has been developed. This allows one channel with a 12-position switch and two optional trigger buttons to control 12/24/36 actions depending on how used. This allows outputs to be switched on/off, the two complex flash sequences described above to be started/stopped, and several changes to be made to motor and other settings. This feature is available from v611-3 on all Rx6x receivers. It is disabled by default but can be enabled with the Paperclip change method. It currently has a few motor control settings as defaults. Other settings can be set up with a Prog4.

The Menu feature requires transmitters to have the extra switches. Tx72 = Tx22+Menu and Tx74 = Tx24+Menu.

Tx22/24 upgrade options for Menu:
1. Tx22/24 manufactured from June 2014 (Tx2 v206 or higher) have an ability to control Ch7 which is the default channel for the Menu feature. However, adding the extra switches will require a new box and be a significant rebuild.
2. Two trigger buttons can be added to the Selecta channel (Ch2). These can trigger two 'menu' items while retaining Selecta.
3. The 12-position rotary switch on Tx22/24 can be used for Menu instead of Selecta. In this case the Tx will no longer have 'Selecta' but can be used like Tx20/Tx21 to control one loco at a time.

Jan 2015 Rx61c
New version of Rx61. Size is between previous Rx61 and Rx60 so replaces both. Higher max voltage rating but intended for use up to 3 lipos (12.6v)

Tool for changing settings in DT 'surface' receivers with a computer. Prog4 creates a wireless bridge between the PC and Receiver. Other tools described here. Owners of Prog1/2/3 can have them converted to Prog4 at no cost other than postage to DelTang.

Dec 2014 Rx65b
New version of Rx65. Slightly larger but more outputs and more space around them. Ability to have a daughter board to get extra features such as two motor outputs or double the current handling to 6A.

New version of software for Rx6x receivers to be rolled out progressively starting with Rx65. Biggest changes are:
* Throttle changes act more as a 'target' than before and the Rx better manages how it transitions. This is most noticable when changing direction. Always uses 512 step resolution regardless of inertia/soft start setting.
* Receivers can now be bound with up to 12 transmitters with Selecta enabled, one per Selecta switch position. This allows models to be de-selected as before, and now also allows control to be passed between transmitters based entirely on the Selecta switch position.
* New 'LVC Sleep' option which puts Rx into sleep mode 5 minutes after when battery goes flat.
* Any number of Directional lights and on any pad, and many other smaller changes.
* Some other features appear in the programming table which are not released yet. These are marked with red text. Many of these need a PC programming capability.

Aug 2014 Tx2-Thin
Identical to Tx2 but with the connector removed and the large capacitor replaced with a small one.

Same as Rx45-v5 but channels changed for DX3.

Jul 2014 CB2
Upgrade to Tx2. Requires an external transmitter module (not provided)..

May 2014 Tx2
Version 206 adds ability to use the Bind button to change whether Inertia pot controls Inertia, Ch4 or Ch5. This gives greater flexibility for Tx21, Tx22 and Tx24. Ch7 changed from digital to analogue and calibration added for 12-position switches in Profiles 1, 5 and 6. Fixed problem saving frequency and profile changes.

New transmitter, similar to Tx22 but with a pot instead of switch for Direction. The pot can still be used for Direction with 'low off' motor control, but can also be used to steer a vehicle or for live steam. The operator can toggle whether the Inertia pot controls Inertia, Ch4 or Ch5 so up to three proportional controls are available (Ch1, Ch3 and Ch4/5) eg: for for valve gear, blowers, animation, etc.

Rx61 with 12 channel SumPPM enabled, auto-bind, thicker aerial, servo lead and heatshrink covering. Works with DSM2 and DSMX.

Apr 2014 PC1.27
Polarised connector with 1.27mm pitch.

Mar 2014 Rx45-22
Train version of this tiny receiver. Integrated 2-direction motor controller, Selecta enabled, suitable for Tx21 and Tx22.

Mar 2014 Rx6x
Version v610-11 software makes it very easy change a few settings with just a paperclip. Changes include Low vs Center off motor control, and enabling/disabling LVC and Selecta.
More details

Feb 2014 Rx35d
'Twin steer' version of Rx35. The versions without the -7 in the name have fets installed to make two brushed ESCs. These ESCs are also referred to as 'A' and 'C' outputs. They can be changed by the user to be servo outputs.

The '-7' versions have 7 servo outputs and no fets for brushed ESCs. The software in all versions is identical; they just have different default options enabled.

Jan 2014 Rx31-K1
New version of Rx31 with 7 channel Serial output on one pad.
Same core software as other variants of Rx31 but with different output type enabled.

Jan 2014 Rx6x
Version v610-7 software with adjustable Emergency Stop and new 'Buffer Stop' and 'Stop & Reverse' features.
More details

Jan 2014 Rx60/61/63
New web pages for v610 software (same as used in Rx62/65).

Dec 2013 Tx2
Added 'Profile 7' to make 7 channels easier to implement. New software version v205.

7 channel transmitter for switching simple layout animation such as model railway points.

New transmitter module to control up to 45 servos with up to nine Rx105.

New receiver with 5 servo outputs with adjustable throws. Intended to control rail points/switches/signals/lights.

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