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Maker EAN13 in Software C h a p t e r T w e l v e : 6 & 2-Meter Dual-Band Amateur Radio

C h a p t e r T w e l v e : 6 & 2-Meter Dual-Band Amateur Radio
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Figure 12-7 6N2 meters
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C h a p t e r T w e l v e : 6 & 2-Meter Dual-Band Amateur Radio
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generally be much more active than the 6-meter band unless there is a 6-meter band opening Now, you will need to adjust the squelch control The correct adjustment of the squelch control is to advance the control until the receiver noise is silenced When the receiver is tuned across the band and a signal is found, the squelch will release and the transmission will be heard As you continue tuning away from this signal, the squelch should again come into effect and squelch the receiver noise Remember that the function of the squelch control is to eliminate static when there is no signal present This control sets the level of passable signals The squelch control works by raising the voltage to the ( ) input to the audio amplifier and thus disabling the amplifier output Turn the squelch control fully counterclockwise The audio should produce a hissing sound Turning the squelch control clockwise should quiet the audio Check the leads going to the control Now that the receiver seems to be functioning, you will need to calibrate the receiver using an RF frequency generator You will need to borrow an RF signal generator from a friend or local radio enthusiast in order to calibrate your receiver for best operation
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input Turn the tuning control on the receiver to the full counterclockwise position (lowest frequency) With the squelch control tuned fully counterclockwise (OFF), a rushing noise will be heard Tune the RF generator until the receiver noise disappears and note the frequency on the generator dial Next, rotate the receiver tuning control to the full clockwise position (higher frequencies) Repeat the above procedure to determine the upper frequency of your tuning range If the range is too low, decrease L4 by spreading the turns If the range is too high, substitute the 39 pF capacitor with the 33 pF capacitor in C6 Then, repeat both procedures to determine the upper and lower frequency limits With a little perseverance, you should arrive at a range covering the 2-meter band (144 to 148 MHz) Set the generator at different points (144, 145, 146, etc) and tune the radio for quieting at each setting Mark the dial with the appropriate values Using the plastic alignment tool to adjust L3, follow the same procedure for the 6-meter band (50 to 54 MHz) Note: Before the receiver is properly adjusted, you may receive a broadcast from an FM station or TV station These signals will be distorted because they are wide band FM transmissions and the 6N2 is a narrow band amateur receiver If a frequency counter is available, it can be used to measure the frequency of the local oscillator at pin 20 of U1 On the 2-meter band, the counter should read 1333 MHz to 137 MHz, and on the 6-meter band, it should read 393 MHz to 433 MHz
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Attach a two foot or longer length of wire to the male RCA plug and connect it to the radio antenna jack Install a fresh battery and turn the power ON Make sure that the squelch control is fully counterclockwise and the volume control is set at mid-position A rushing noise should be heard from the speaker when no signal is present, which is normal Slowly tune the radio on each band and listen for activity Reception will only be possible if someone is transmitting If you know someone with a 2M or 6M transmitter, you should test your receiver with known frequencies of transmission and adjust the high frequency oscillator for proper tuning of desired bands A calibrated RF generator may also be used to adjust the oscillators Start with the 2-meter band Loosely couple the output of the RF generator to the receiver
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