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
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
2 INSTALLATION MECHANICAL HF SSB TRANSMITTER T2130<br />
Each of the watched parameters results in a number of steps. The steps are simply added to the step found<br />
when the Automatic Power Setting was per<strong>for</strong>med.<br />
act_step<br />
= APS_step + n1 + n2 + n3<br />
Where: act_step = actual step <strong>for</strong> the attenuator<br />
APS_step = the step found at the Automatic Power Setting<br />
n1 = deviation step related to SWR<br />
n2 = deviation step related to Temperature<br />
n3 = deviation step related to Battery Voltage<br />
The subsections below describe each of the parameters watched.<br />
SWR WATCHING<br />
When the T2130 is transmitting, the SWR is continuously watched. This means in terms that the TXprocessor<br />
(3) measures the Rho approx. 2500 times per second.<br />
Note: Rho and SWR are two expressions describing the same physics.<br />
SWR - 1<br />
1 + Rho<br />
Rho = ------------ SWR = ------------<br />
SWR + 1<br />
1 - Rho<br />
The measured Rho is compared to two limits.<br />
If SWR > 2.0 (Rho > 0.333) then a calculation takes place. The result of the calculation gives a number<br />
of 0.3 dB steps with which the RF-signal has to be reduced. The number of steps n1 is given by:<br />
(Rho - 0.333) * 18<br />
n1 = ------------------------ (n1 cannot be negative).<br />
0.3<br />
If SWR > 5.0 then the error message ‘Bad SWR’ is generated. The operator is in<strong>for</strong>med when the key is<br />
released.<br />
TEMPERATURE WATCHING<br />
The temperature at the power transistors in the Power Amplifier (1) is measured 4 times per second.<br />
The measured temperature is compared to two limits. If the temperature is above 98o Celcius a calculation<br />
takes place.<br />
The result of the calculation gives a number of 0.3 dB steps with which the RF-signal has to be reduced.<br />
The number of steps n2 is given by:<br />
Measured temperature - 98°C<br />
n2 = ----------------------------------------- (n2 cannot be negative)<br />
2<br />
This means that a temperature increase of 20°C to 118°C reduces the RF power approx. 3 dB.<br />
If the temperature is above 118° Celcius the Power Amplifier (1) is blocked and the RF-power is reduced<br />
further approx. 60 dB. An error message is generated and when the key is released the operator is<br />
in<strong>for</strong>med.<br />
When the temperature has fallen to 100° Celcius the Power Amplifier (1) is opened again.<br />
9315<br />
PAGE 2-33
Change language