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Recommendations for use of FX12/19 (FXL12/19) Dual-Frequency Transmitter as part of F2 Location System

Recommendations for use of FX12/19 (FXL12/19) Dual-Frequency Transmitter as part of F2 Location System

FX 12/19 (FXL12/19) dual-frequency transmitter, as well as other multi-frequency transmitters for location systems, is effective in high industrial interference environment. It operates both in the range of 12 kHz and 19 kHz. Instructions describe how to set the frequency of optimum transmission and to adjust F2 location system and the transmitter.

Operators manual FX12/19 and DigiTrak F2

Adjustment of location. How to set optimum transmission frequency 12 kHz or 19 kHz

Step 1. Make sure F2 location operates both in the range of 12 kHz and 19 kHz

To accomplish this the central icon at the bottom of the display Mode menu should have the image similar to a round speedometer scale. In case the icon shows the image similar to the school protractor, you have an “old” version of the single-frequency F2 location operating only in the range of 12 kHz frequency.

Single-Frequency F2

Single-Frequency F2

Dual-Frequency F2

Dual-Frequency F2

Step 2. In case with “new” dual-frequency F2 location — set frequency of 19kHz

In the case of the “new” dual-frequency F2 location, set the operating frequency of 12 kHz repeatedly clicking the button on the “speedometer” icon, then, by pressing and holding the button, go to the next page of the menu and select with multiple clicking the right icon depicting “12kHz” and “19 kHz” transmitters at the bottom of the screen. Again, by pressing and holding the button, go to the menu listing the available transmitters. Having selected by multiple clicking the icon with the “19 kHz” transmitter (top right), press and hold the button to select the operating mode of the FX19 battery-operated transmitter.

F2 location menu to set FX19

F2 location menu sequence to set FX19 operation mode

Step 3. Checking drilling area for interference

Go along the drilling area (without the transmitter!) from the beginning till the end and mark the places with the highest level of interference (bottom right-side numbers on the display in the navigation mode shown alongside with indications of the location of the transmitter, roll, pitch and temperature).

Step 4. Recheck area interference with 12 kHz mode

Switch the location to FX12 transmitter mode (“12 kHz” operation frequency, as described in art. 2), go in the opposite direction along the drilling route and again mark the places with the highest level of interference.

Step 5. Set operation frequency with minimum interference

Compare the interference levels obtained at the frequency of 12 kHz and 19 kHz, select and install the location frequency with the lower level of interference, for example, 19 kHz.

F2 location menu to set FX12

F2 location menu sequence to set FX12 operation mode

Set the required FX12/19 frequency of the transmitter to be paired with the location. The frequency is selected at the first start of the transmitter (when installing batteries into the battery compartment) and depends on the transmitter’s head position.

Pointing down — to switch 12kHz

If the transmitter is pointed down (has a pitch value over minus 100%), after installing the batteries and jolt ramming/rotating of the transmitter, in about five seconds the transmitter will operate at the frequency of 12 kHz.

Pointing up — to switch 19kHz

If the same is done when installing the batteries with the transmitter pointing up (has a pitch value over plus 100%), then, after about five seconds the transmitter will operate at the frequency of 19 kHz.

Changing of frequency modes for FX 12/19 (FXL12/19) transmitter

Choice of FX12/19 frequency depends on transmitter’s positionin

After installing the batteries and jolt ramming/rotating of the transmitter, make sure you wait for the location display signal to appear. The signal will be displayed in 5 seconds — after transmitter’s initialization. Then, you may move the transmitter as you wish.


Changing the operating frequency of the transmitter requires a pause of 15 seconds without batteries in the power-off mode to completely discharge the transmitter and get ready to the mode switch. Otherwise, the frequency may not change.

If the pitch angle of the transmitter when switching on (battery installation) does not go over “minus 100 % — plus 100%”, the value of the set frequency does not change when you replace the batteries.

Example: how to select 19kHz frequency

For example, to select the 19kHz frequency (art. 1-4) you need to install the batteries from below while the transmitter`s head is pointed up. In 3-4 seconds you will see the increase in the level of signal on the location display, after which you can carry out all the procedures of installing the transmitter with the drill head and system calibration.

Author`s articles:

Nagovitsyn Aleksandr Leonidovich
Founder and Leading Engineer in repair, modernization and development of HDD location systems
My e-mail: repair@hdd-electronics.com

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