Electrical Research Lab 6317 Schematic

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Manufacturer:Electrical Research Lab (Sentinal)(ERLA)

Schematics Content:

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MODEL 6300 , 6515



Band No. 1 ~ from 10 legacycles to 24 legacyclel
Band No. 2 - from 4 llegscycles to 10 Hegacycles
Baud No. 3 - from 1.5 legacyclss to 4 legacycles
Band Ho. 4 - from 1500 Kilocycles to 540 Kilocycles

Selection of the desired frequency hand is made with the band selector switch knob s e

double knob) which is located on the lower right front of the cabinet below the tuningrgonzsgl :33.or'hen
the band selector switch is placed in the mximum left hand position the receiver is operating on Band

lo. l, 10 megacycles to 24 negacycles. Rotating the band selector knob in the clockwise vdirection the
three other positions are in the order named, knd No. 2, 4 megacyclee to 10 megacyclcs, End No. 5 1.5 to
4 megacycles and kno Ho. 4, 1500 kilocyoles to 540 kilocycles. All four frequency bands are calibrated on
a single dial. The calibrated section of the dial for the band that the receiver is adjusted to operate on
is indicated by the dial indicator which is automatically adJusted by the band selector switch knob.

SHORT WAVE RECEPTIOK- The usual carsless tuning that is sufficient to bring in the long wave length regu-

lar Broadcast tations will fail in tuning in short wave reception. In tuning for shcrt wave stations,
1," great care must be taken so that the stations are not passed over, as the tuning is ver sharp and guite
f critical. lsny times s lack of rmlts when tuning for short wave stations is due no only to thopemtor
`tuning the receiver incorrectly, but also to the operator trying to pick up foreign and North American
short wave stations when the stations are not broadcasting. An important consideration is the time di!~
ference between the United States and European Countriesgie., at 10:00 PJ. Central Standard Time it 1.
4:00 A. ll. in England and 5:00 A. ll. in most other countries in maps and, as s rule, no station. u-e bm
casting at that time. While short wave reception presents a varied and more thrilling entertainment hm
we have been accustomed to hearing on the broadcast band, the mnny peculiarities and difficulties of short
"va reception have been minimized and the possibilities over-omphnsized, which has resulted in the er-
roneous belief that reception of foreigx short wave stations is an easy accomplishment. To the contrary,
short wave stations are not tuned in with the ease we have been accustomed to in tuning in local broadcast
stations, but requires patience, extreme care in tuning, an understanding of the proper procedure and
favorable conditions. Reception of short wave stations, as a rule, is not comparable to the clear, static-
free programs received from the local broadcast stations, but is more erratic and is generally accompanied
by fading and static although occasionally reception may be as good as local programs.

I Reception of short wave stations varies from season to season and between daylight and after Sunset.

Bend Ko. 4 (regular broadcast band) from 1500 to 540 kilocyolss varies also in that the range of the
station is materially increased after dark and fading of distant stations becomes more pronounced. In
some locations stations that are received during daylight occasionally i'sde so badly after sundown that
it is impossible to receive good reception after dark. Other stations which cannot be heard during day-
light provide good reception after darkness.

End lo. 3, 1.5 to 4.0 mogacycles permits reception of police calls and some amateur phone stations.
'his range of the stations broadcast within this band is increased after sundown.

Bend lo. 2 from 10.0 to 4.0 mqscycles includes the 49 meter band, the 31 unter band and some amateur
stations. Stations broadcast within this band include many of the foreign short wave stations and North
American Stations. Reception of stations transmitting on the 49 meter band is most reliable during the
Sx-er months when located approximately 300 miles or more during daylight which increases to 1,500 miles
or more when a large portion o! the signal path lies in darlmess. 'me Winter range is approximately 600
miles during daylight and 2,000 miles or more after sundcwn. Stations operating on the 51 meter band are
most reliable when the receiver is located about 800 miles away during daylight in the Sumsr months in-
creasirg to 2,500 miles after sundown.

land Ho. l, from 24 msgacycles to 10.0 memcycles includes the 25, 19 and 16 meter hands. Reception
of stations in the 25 mater band is best during daylight when the receiver and transmitter are located
1,000 .iles or less than 2,000 miles apart. "ter sundovn reception may be expected only from stations
located a distance of 2,000 miles or more away from the receiver. Stations operating on the 19 meter band
U provide satisfactory reception generally during daylight hours only. After nightfall or when any appreci-
/'\ able portion of the transmission path is in darkness signals are rarely heard. Stations operating below 19
meters are generally useful only when transmitting during dayliyit and over s distance of 2,000 miles or
more. Ordinarily they cannot be received after sunset.

1039 Broadcast, Antenna, Preselsctor a Oscillator Coil
1085 Short Wave Oscillator Coil
1002 short wave Antenna o nrsf. Detector con iggg "mangogzgelgesutor strip
1058 First I. F. Transformer 9671 Pilct Lamp socket
9855 Second l. F. Transformer 5248 2_5 you Pilot'mp Bulb
9562 Hurd I. F. Transformer 593? Tube shield
9500 R' F- Ch?k? . 9002 'robe shield Cap
S'IBS 10.00? 0m 'PM "Fm" 9459 .0005 lard. molded condenser
'7998 1 Iles Ohm 1 We" ""1"" cess 1 nfs. loo volt condenser
S906 250.000 Ohm 1/5 '8" "HHN" 9205 .1 no. 400 veit condenser
6800 6.000 Ohm 1/5 'PM ""1"" seas .1 no. zoo voir. condenser
9287 Short Wave Trimar- Disc. Assembly 5951 ,05 nd, 400 vol; Condenser
9682 Short Wave Tri-mer Worn Tunine R?d 10'1'1 .as urs. a. .004 nfs. 400 volt condenser
9675 Peddine Condenser 1170 .0005 no. a .05 lard. 400 volt condenser
9674 Paddlnc 00nd?n=er 9591 .001 lfd. a .05 sro. 400 voir. condenser
9799 Tri-'mer C?nd=naer 6765 .2 nfs. 400 veit condenser
9659 Electrolytic Condenser Dual B lLfd. 9.052 ,2 "fm 200 Volt, condenser
,/` 8876 Electrolytic Condenser 5 lard. ' 184 500.000 mm 1/3 'on Resistor
1110 Electrolytic Condenser 4 le. 500? 100.000 ohm 1/3 'get Resistor
'3660 POW" Trlnefwmer save 50,000 ohm 1/3 van Resistor
9665 Dyna-mic Speaker 5' sooo 25,000 on.. 1/5 vet: Resistor

9'725 Dynamic Speaker B' os'ls 250 ohm 1/5 watt Resistor
9556 Volume Control 799-7 2_000 ohm 1/3 'its Roni sto;-
9174 Tone Control

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