Uplands House, Castle Howard Road, Malton YO17 6NJ
www.micronradiocontrol.co.uk
+44 (0)1653 696008
Tx20Sv2 User Information
Tx20Sv2 is a hand-held wireless transmitter intended to control one model
railway live steam locomotive or a battery electric locomotive with the ESC set
to low-off throttle. Tx20Sv2 has a large knob for regulator control plus a
smaller knob for valve gear (or ESC direction control) and three push buttons
for auxiliary functions (e.g. a whistle servo).
Technology
Tx20Sv2 uses the 2.4GHz band which requires no frequency channel
control and is very resilient against interference. All radio frequency
components are contained on the internal
module. There are no user
adjustable parts on this module and it should not be modified.
Tx20Sv2 is compatible with all DSM2 receivers; this includes all Deltang
receivers and many Spektrum plus 3rd part Spektrum compatible receivers.
Any number of receivers can be bound to your Tx20Sv2 but only one should normally be switched
on at a time to operate them independently.
Range is suitable for indoors and small outdoor sites; the outdoor free-air range to a Deltang
receiver is at least 50m. Range indoors is affected by building construction materials, furniture,
people and receiver installation.
The regulator and direction knob movemements and bind push button action are transmitted as
separate R/C 'channels' which must match the receiver configuration:
Control
R/C Channel
Channel Value
regulator knob:
1
F1 button:
2
button up = mid, button down = low
direction knob:
3
F2 button:
4
button up = mid, button down = low
bind/F3 button:
5
button up = high, button down = low
Battery
The Tx20Sv2 uses a PP3 9V battery, preferably Alkaline or NiMH / Lithium
rechargeable. The maximum working voltage of the internal electronics module is 10V
and there is a protection diode wired in series with the battery lead. This allows the
battery voltage to be up to 10.7V. If the battery voltage is above this value, the
internal regulator will shut down and the transmitter will not operate.
To replace the battery:
Make sure that the power on/off button is off (up) before) adding or removing a battery.
Remove the lid at the bottom rear of the case by sliding it downwards. When Tx20Sv2 is new this will
require a bit of effort to slide it past the retaning 'click'. The image at the right shows the case rear with
the battery lid removed.
Remove the battery from the compartment and pull the battery clip off the terminals. Replace the clip
on the new battery which will only fit one way round. TAKE CARE, if force is needed, the connector is
probably the wrong way round.
Replace the battery cover by sliding it up from the bottom making sure that the retaining tab goes
under the case rear. The battery is held in place with a piece of foam attached to the cover and you will
feel some resistance as the cover is pushed down onto the battery.
Micron R/C, www.micronradiocontrol.co.uk, +44 (0)1653 696008
Tx20Sv2 User Information : 1 of 4
