TIMTER™ Multi-mode Digital Telemetry Transmitter
74
Quasonix, Inc.
5 RF Output Notes
There are three methods of muting the RF output. If you do not have RF output, check these conditions:
1.
RF On / Off command – From the control terminal, type
RF
to query the current state of the RF On/Off
variable. If it is 0, type
RF 1
to turn the output back on.
2.
External clock removal – If the unit is configured to use the external clock (CS = 0), that clock’s presence
is detected. If it is not present AND the unit is not running in Clock Free mode, the RF output automatically
shuts OFF (unless the AC or ACS option is present, in which case the RF output switches to just a carrier at
the center frequency with no modulation on loss of clock). When the data clock comes back, the RF output
automatically turns on. The lag from data clock state change to RF output change is about 0.1 seconds, but
varies based on settings.
If the unit IS running in Clock Free mode, no clock is required, but the loss of data transitions is detected.
This will cause the RF to shut OFF (or if AC or ACS option and AC is set to 1, change to a carrier on
center frequency). When the data transitions begin again (or when an external clock is reapplied if NOT in
Clock Free mode), the RF output turns on again.
3.
RF On / Off pin – The RF On / Off pin is a hard OFF control for the RF output. The polarity of this pin is
selectable using the RZ command. The RF On /Off pin (in the inactive state) forces RF OFF; the RF On
/Off pin can only allow RF to turn on, but it cannot force it to turn on.
If RZ = 1 then a high level on the RF On / Off pin allows RF On.
If RZ = 0, then a low level (ground the RF On / Off pin) allows RF On.
The RZ command is described in section 4.2.1.
5.1 Troubleshooting the RF on a Quasonix Transmitter
The following is a quick, three-part test to verify that the RF output on the transmitter is working correctly. This
procedure should work for most transmitters with no modifications, however the sheer number of extra options and
variations means that some units will need some special instructions or may work slightly differently. Examples are
auto-carrier (-AC option), clock free (-CF option) and recall-holdoff (-RH option). If the procedure below does not
demonstrate the working RF output on the transmitter, please contact Quasonix technical support for further help in
resolving the issue.
The three sections below demonstrate RF output functionality one step at a time: first a carrier, then a waveform
based on internal clock and data, and finally the waveform using the user supplied external clock and data. Part one
demonstrates a simple carrier output at the desired frequency. Part two demonstrates proper waveform modulation
using internal clock and data generated by the transmitter itself. Part three switches to the user supplied external
clock and data for normal operation. If the first two parts work correctly, then the only missing piece is the external
clock and data, so resolving any final issues becomes easier.
Part 1: Checking for carrier power output on frequency
1.
Turn on power to the transmitter.
2.
Set the mode to 6 (carrier only) using command
MO 6
.
3.
Set transmitter to the desired frequency using the
FR
command. For example,
FR 2200.5
.
•
To see the allowed frequencies on your unit, type
FR ?
.
4.
Turn the soft RF control on with
RF 1
.
Содержание TIMTER QSX-V Series
Страница 39: ...TIMTER Multi mode Digital Telemetry Transmitter 31 Quasonix Inc Figure 22 Baseband Signal Timing ...
Страница 101: ...TIMTER Multi mode Digital Telemetry Transmitter 93 Quasonix Inc Figure 41 Shock Pulse X axis Negative ...
Страница 109: ...TIMTER Multi mode Digital Telemetry Transmitter 101 Quasonix Inc Figure 42 Transmitter Clock and Data Logic ...
