Sailor COMPACT HF SSB T2130, Technical Manual

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2 INSTALLATION MECHANICAL HF SSB TRANSMITTER T2130
2.3.3.3 TUNING THE AT2110
The tuning may take place in 3 different procedures:
- Uptune, where a tuning is done from basic data.
- Retune, where the tuning is done from data saved at the latest Uptune.
- No tune, which is done when there is no AT2110 in the system (jumper 5 is inserted).
UPTUNE PROCEDURE
This is the basic tune procedure for tuning the AT2110. The conditions for an uptune procedure are the
following:
- ’TX TUNE’ is entered on the keyboard on the RE2100.
- The frequency has not been tuned before. This means that there is no valid data in the EEPROM’s
for the specific 200 kHz band in which the frequency is.
- The retune procedure did not work out. The retuning could not be done with the data saved in the
EEPROM’s. The measured Standing Wave Ratio (SWR) was too high. The aerial conditions may have
been changed since the latest uptune of a frequency in the 200 kHz band concerned, or the data saved
in the EEPROM’s are deleted by use of the Service Programmes.
The uptuning may take place in up to 6 states. The states are sequently executed until the uptuning is
accepted.
1. The relays in the AT2110 are set so the RF-signal is fed straight through the coupler. This means that
no resonance (inductance, (L)) or load (capacitance, (C)) is active.If the SWR (Standing Wave Ratio)
is better than or equal to 2.0 the tuning of the aerial is accepted. A possible previously saved
combination is deleted from the EEPROM’s.
If jumper 4 on the TX-processor (3) is inserted this ‘signal straight through’ combination will NOT be
tested.
2. A sequence of shifting the resonance and the load in a certain pattern is run through.
For each frequency band (200 kHz) a number of combinations of fixed resonance values (L) and fixed
load values (C) are switched in.
For every combination of a fixed resonance and a fixed load the variable capacitor is run through the
working range.
Within the working range of the variable capacitor the SWR is measured and compared continuously
to certain limits.
The first combination always contains the highest value of the resonance (most L is in) and the lowest
value of the load (least C is in).
The next combinations contain each a decreasing value of the resonance and the lowest value of the
load.
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