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The final alignment of the weather satellite receiver is best done with a satellite signal However, you need to give it a basic alignment first so that you can at least find the signal from a satellite when it s within range For the basic alignment, you ll need access to a frequency counter capable of measuring up to 150 MHz and an RF signal generator which can be set to give an output at 13750 MHz and at 13762 MHz It should be able to provide either unmodulated (CW) output or frequency modulation, with a modulating frequency of 24 kHz and a deviation of 25 kHz or thereabouts If the generator can t be accurately set to the above frequencies, you ll need to use the frequency counter to
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Twenty-three: Weather Satellite Receiver
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help set its frequency You ll also need your multi-meter during the tuning-up process, to monitor received signal level The first step is to set the local oscillator frequencies for the two reception channels This is done by adjusting trimpots VR4 and VR5 respectively, while measuring the oscillator s frequency with the frequency counter The oscillator signal is coupled to the counter via a sniffer coil which is connected to the end of a coaxial cable The other end of this cable is then connected to the counter s input Note that there is no direct physical connection between the oscillator coil and the counter s sniffer coil Instead, the sniffer coil is placed about 9 mm in front of oscillator coil (L3) and roughly on-axis (ie just in front of the 10 pF capacitor) The sniffer coil can be made by winding four turns of 08 mm enameled copper wire on a 5 mm drill shank Its ends can then be soldered to a BNC socket which is then connected to the end of the counter input cable This arrangement picks up enough oscillator energy to give reliable counter readings, without needing to be any closer to L3 (to avoid pulling the frequency) Assuming you want to receive the NOAA satellites, set the oscillator frequency for channel A to 1320 MHz (using VR4), and the frequency for channel B to 13212 MHz (using VR5) These correspond to reception frequencies of 1375 MHz for NOAAs 12 and 15 and 13762 MHz for NOAA 17 If you want to try for other satellites, you ll need to find out their APT frequency and set the oscillator frequency to 55 MHz below that figure instead, and adjust the tuning controls Once the oscillator frequencies have been set, the next step is to peak up the RF stage tuned circuits This is done by setting your RF signal generator to produce an unmodulated (CW) signal at 1375 MHz, initially with a level of about 30 mV That done, connect the generator s output to the antenna input of the receiver, using a series DC blocking capacitor if the generator doesn t have one (so that the generator doesn t short out the +12V phantom power for the masthead amplifier) Next, connect your multi-meter (set to the 5V DC range) across the 390k ohm resistor just behind Q2 and make sure switch S1 is set to the channel A position
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Now turn up RF gain control VR1 to about midway and use an alignment tool or a very small screwdriver to adjust trimmer cap C10 until you find a peak in the voltage reading on a multi-meter If you can t find a peak, you may have to pull the turns on coil L2 slightly further apart to reduce its inductance Once the peak is found, adjust VC2 carefully to maximize the meter reading (the multi-meter is reading the RSSI voltage from IC1, so it s essentially showing the received signal strength) When you re certain that the L2/C10 circuit is tuned to 1375 MHz, check the actual voltage reading of the meter If it s more than 25V, reduce the output level from the RF generator until the multi-meter reading drops to about 20V Now you re ready to peak the receiver s input tuned circuit ie L1 and VC1 This is done in exactly the same way as for L2 and C10 Just adjust C4 slowly until the multi-meter indicates a peak and then carefully set C4 for the maximum peak reading If you can t find another peak, you may need to pull the turns of L1 slightly further apart as before The final alignment step is to set the slug in quadrature detector coil L4 to the correct position for optimum FM demodulation of the 55 MHz IF signals This is done by first switching the signal generator so that it s still producing a 1375 MHz signal but this should now be frequency modulated preferably with a 24 kHz tone and a deviation of about 25 kHz Now, connect an 8 ohm speaker to the receiver s speaker socket (CON3) and turn up the audio gain control (VR3) to about the 10 o clock position You may not be able to hear the 24 kHz modulating signal at this stage but in any case, slowly and carefully adjust the slug in L4 using a non-magnetic alignment tool Sooner or later you ll start to hear the 24 kHz tone and you should also be able to tune the coil for maximum audio level and minimum distortion and noise Once this has been done, the basic alignment of your weather satellite receiver is finished and it s ready for final alignment using the signals from a weather satellite But before you ll be able to do this, you ll need to build or buy a suitable antenna and perhaps a small masthead pre-amplifier to boost the signal if necessary The best antenna for APT weather satellite reception is either a turnstile or quadrifillar antenna
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