technical manual for sailor compact hf ssb t2130 - Gopher Proxy
technical manual for sailor compact hf ssb t2130 - Gopher Proxy
technical manual for sailor compact hf ssb t2130 - Gopher Proxy
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2 INSTALLATION MECHANICAL HF SSB TRANSMITTER T2130<br />
2.3.3.3 TUNING THE AT2110<br />
The tuning may take place in 3 different procedures:<br />
- Uptune, where a tuning is done from basic data.<br />
- Retune, where the tuning is done from data saved at the latest Uptune.<br />
- No tune, which is done when there is no AT2110 in the system (jumper 5 is inserted).<br />
UPTUNE PROCEDURE<br />
This is the basic tune procedure <strong>for</strong> tuning the AT2110. The conditions <strong>for</strong> an uptune procedure are the<br />
following:<br />
- ’TX TUNE’ is entered on the keyboard on the RE2100.<br />
- The frequency has not been tuned be<strong>for</strong>e. This means that there is no valid data in the EEPROM’s<br />
<strong>for</strong> the specific 200 kHz band in which the frequency is.<br />
- The retune procedure did not work out. The retuning could not be done with the data saved in the<br />
EEPROM’s. The measured Standing Wave Ratio (SWR) was too high. The aerial conditions may have<br />
been changed since the latest uptune of a frequency in the 200 kHz band concerned, or the data saved<br />
in the EEPROM’s are deleted by use of the Service Programmes.<br />
The uptuning may take place in up to 6 states. The states are sequently executed until the uptuning is<br />
accepted.<br />
1. The relays in the AT2110 are set so the RF-signal is fed straight through the coupler. This means that<br />
no resonance (inductance, (L)) or load (capacitance, (C)) is active.If the SWR (Standing Wave Ratio)<br />
is better than or equal to 2.0 the tuning of the aerial is accepted. A possible previously saved<br />
combination is deleted from the EEPROM’s.<br />
If jumper 4 on the TX-processor (3) is inserted this ‘signal straight through’ combination will NOT be<br />
tested.<br />
2. A sequence of shifting the resonance and the load in a certain pattern is run through.<br />
For each frequency band (200 kHz) a number of combinations of fixed resonance values (L) and fixed<br />
load values (C) are switched in.<br />
For every combination of a fixed resonance and a fixed load the variable capacitor is run through the<br />
working range.<br />
Within the working range of the variable capacitor the SWR is measured and compared continuously<br />
to certain limits.<br />
The first combination always contains the highest value of the resonance (most L is in) and the lowest<br />
value of the load (least C is in).<br />
The next combinations contain each a decreasing value of the resonance and the lowest value of the<br />
load.<br />
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