MAT-TUNER
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Automatic Mode:
When the RF signal is input into the mAT-125E, the tuner verifies that the
power at its input (FORWARD) is within the predefined range (1-20W). Power above this range
can damage the relays during the Hot Switching, while power below the predefined range can
cause inaccurate tuning. If the tune power is within the specified range, the tuner captures a
20ms sample of the signal. The sample signal frequency is divided by 128 and measured by a
counter. The tuner reads the tuning data corresponding to the measured frequency from its internal
memory (such data exists if tuning was previously performed for this frequency). The tuner sets
the tuning network according to that data and measures the resulting VSWR, and display the
current VSWR by the LED of the front panel. Even if SWR is higher than 2, the tuning cycle will
not be activated unless the TUNE key is pressed and released.
Semi-automatic:
When the RF signal is input into the mAT-125E, the tuner only measures the
current VSWR and displays the results through the LED on the front panel, a tuning cycle is not
initiated until the [TUNE] key is pressed. When the [TUNE] key is pressed and released, similar
to the automatic mode, the tuner measures the frequency of the input signal, reads the
configuration data from the corresponding memory, and configures the LC tuning network. After
completing the above operation, the tuner will measure the current VSWR. If VSWR<1.5,the
tuning is completed. If it is higher, a new tuning cycle is started. When the tuner completes the
tuning process it stores the tuning network data in memory in a location corresponding to the
current frequency.
Manual:
Regardless of whether the tuner is in automatic or semi-automatic mode, you can fine tune the
current LC tuning network by pressing the [CUP], [CDN], [LUP], and [LDN] key. After the
manual seat adjustment is completed, you can save the current configuration data in the
corresponding memory by pressing the [TUNE]+[LUP] combination key.
Tuning
The steps to start tuning are as follows:
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Set the radio to the FM, FSK or RTTY mode,
in order to make the transceiver output a stable
carrier signal
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Make the power reduced to 20 watts or less.
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Press and hold the transceiver’s [PTT] button, then press the [TUNE] button once on the front
panel of mAT-125E to start the automatic tuning.
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Return to the previous mode and power level after tuning, the tuning process completion.
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After tuning, the front panel's three lights are used to display the current VSWR.
Online/Bypass state switching
There are two ways to switch the state of the tuner. Shortly press the [TUNE] key and the [TUNE]
+[CDN] combination key.
If the 1.5 indicator flashes once, it means that the current state is online,
and if the 3.0 indicator flashes once, it means that the current state is offline.
Combination key
A combination key is formed by [TUNE] and other keys([CDN], [LUP], [LDN]) to perform part
of the function operation. The combination key means that the [TUNE] key is first pressed and
held, the other key is pressed, and then released together.
[TUNE]+[CDN]:
Online/Bypass switching. When the 1.5 light flashes, it indicates that the
