Howard-Radio-Co-909-M 电路原理图.pdf

MANUAL OF 1948 MOST-OFTEN-NEEDED RADIO DIAGRAMS HOWARD RADIO COWPARY . Continued on page 78. DUMMY ANTENNA SIG. GEN. CONNECTION GHN. FREQ. BAND POSITION DIAL SETTING VAU/IMl VI TRIMMER ADJUSTMENTS TRIMMER FUNCTION .05 Mfd. Grid of 6SA7 455 KC BC Low end of BC 1,2,3,4 I.F. .05 Mfd. Pin #4 6SK7 1400 KC BC 1400 KC 5,6 BC Osc. and R.F. Note B Note B 1400 KC BC 1400 KC 7 Loop 400 Ohm. Line Antenna on loop 11.9 MC 3W 11.9 MC 8,9,10 SW _l_!_!-1-1-*-1- Accurately set signal generator at one MC and check through short wave dial, hannonlcs to be 5 one MC apart. _ NOTE A. The I.F. adjustments are Iron core slug tuning and It should not be necessary to move them very far In either direction from the factory setting, since they are of a very stable nature. NOTE B Inductively couple signal generator to loop by wrapping one or two turns of wire around outside wire of loop and fasten one end to the high side of the signal generator. NOTE C. In adjusting trimmer #8, be sure the Image of the I.F. Is at approximately ll.MC. CAUTION: Do not knife gang unless absolutely necessary, and then with extreme care. _ *(?*”_11 <-t*o , RECOMMENDED DUMMY ANTENNA. Although the values as shown / m( _L 1 In above table for antenna load may be satisfactory, J mro. T r-/0000 we urgently recommend the circuit as shown at the mmcwatm ltj owe ant. right to properly take care of the various frequencies WC-aNa - CAIN = 14 X AT 400 C.PS- 0AIN = 04SX AT 400 C.P.5. NOTES - 1. RESISTORS ARE 1/4 W.,20% UNLESS OTHERWISE NOTED. K (000 OHMS 2. 6.SV. FILAMENT STRING IS ENTIRELY UNGROUNOEO ON POWER PACK CHASSIS. ONE SIDE IS GROUNDED ON R F CHASSIS ONY. 3. VOLTAGES SHOWN ARE MEASURED TO GROUNO WITH ELECTRONIC VOLT-OHM METER UNDER NO SIGNAL CONDITIONS, AND ARC SUBJECT To t 20% NORMAL VARIATION. A.C. SOCKET POP PHONO. MOTOR PLUG 3.2V. SPEAKER SOCKET 6.3V. FILS, _ 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1948 MOST-OFTEN-NEEDED RADIO DIAGRAMS o yots: 9 O Oo i Sit o : o o- o O So OV) oo gs -0010 ANT 6o -J CD mk < o -j (0 0* o a 0* l oi 61 2o otn -X OO i?4s I3 TRIMMER LOCATION BOTTOM VIEW 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN