Coronet Radio & Television Co. 1701X
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|Manufacturer:||Coronet Radio & Television Co.|
BAND - SWITCH SHOWN AT 1ST POSITION.
BROADCAST BAND 540-1700 KC
BAND - SWITCH SHOWN AT 2ND POSITION.
SHORT WAVE BAND 1.7-7.0 MC
BAND - SWITCH SHOWN AT 3RD POSITION.
SHORT WAVE BAND 6.0 - 21.0 MC
ALIGNMENT OF CORONET MODEL 1701X
Connect on output meter across the voice coil.
Connect the signal generator to pin 8 of the 12SATGT, through a 0.01 mf capacitor. Tune the signal generator to 455 KC, and fully mesh the main tuning capacitor of the receiver.
Keep the receiver volume control at maximum and the output of the signal generator sufficient to give a readable deflection on the output meter.
Adjust for maximum IF Trimmers Cll, C10, C9, and C8.
R.F. - Osc. Adjustments.
The short wave band 3 should be tuned first, short wave band 2, second, and Broadcast band 1 last.
Turn the band switch clockwise to position 3.
Keep the same setup used for I.F. alignment, and apply a 16 mc, signal to antenna coupling capacitor C12, located on top rear of chassis. Tune the receiver to 16 mc. and adjust for maximum oscillator trimmer C2.
Adjust antenna trimmer C7 for maximum output at 16 mc.
Turn the band switch counter clockwise to position 2.
This band has no trimmer for the antenna coil, and since Oscillator trimmer C2 is used for both band 3 and 2, the calibration of band 2 is dependent on the calibration of band 3; And vice versa.
Tune the signal generator and receiver to 5 mc., and check the calibration of band 2. It should be fairly accurate. If it is off to any great extent, Oscillator trimmer C2 can be used to balance the discrepancy in frequency between band 3 and 2.
Turn the band switch counter clockwise to position l broadcast band.
Tune the signal generator and receiver to 1560 KC. Adjust oscillator trimmer C5 for maximum.
Tune the signal generator and receiver to 600 KC and adjust low frequency padder C6 for maximum while rocking the main tuning capacitor.
Tune the signal generator and receiver to 1560 KC and adjust antenna trimmer C4 for maximum output. Then tune the signal generator and receiver to 600 KC and adjust tuning slug L1 for maximum output.
The entire procedure for the broadcast band should be repeated for best results.
All voltage and resistance measurements made with respect to chassis ground and with a line voltage of 116 V.A.C. Band switch in broadcast position.