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Move "Station Selector 2" slowly over  the  scale near  "10'',  say  from 5  to 15.  If 
no  signals  are  heard,  there  is  no  station  working  on  that  wavelength.  Then  set 
"Station Selector 1" pointer at say 12, and slowly move "Station Selector 2" from 
about  7  to  17.  If  again  no  signals  are  heard,  set  "Station  Selector  1"  at  say  14, 
and  move  "Station  Selector 2",  slowly  from  about  9  to  19.  Repeat  this  process, 
increasing the setting of "Station Selector 1" in small steps until the whole scale 
has    been  covered.  It  will  be  noted  after  the  first  few  trials  that  when  
"Station Selectors 1 and 2" are in resonance, a slight "breathing sound" is heard 
indicating that the set is working properly. 

After hearing a signal, carefully adjust both "Station Selectors 1 and 2" for 

the  clearest  reproduction.  To  decrease  the  volume  of  signal,  turn  the  "Volume" 
control toward the left. 

If  no  stations  are  heard  the  loop  of  the  Radiola  26  should  be   turned 

90  degrees  from  where  it  was  during  the  preceding   adjustments,  and  the 
tuning process just described should be repeated. 

After  a  little  practice,  it  will  be  found  possible  to  cover  the   whole 

wavelength  range  by  slowly  moving  "Station  Selector  1"  from   one  end  of 
the  scale    to    the    other    while    keeping    "Station    Selector  2"    in    its  proper  
relation. Always  remember  to  keep  the  "Station  Selectors"  at  approximately 
the  same settings. This is the easiest and quickest way in which to find stations. 

Control  of  Volume. 

The  proper  way  to  control  the  volume  is  to  adjust  the 

"Volume" control knob. If turned to the left, the volume is decreased. If turned to 
the  right  it  is  increased.  If,  however,  the   "Volume"  control  is  turned  too 
far  toward  the  right  (in  a  clockwise  direction)  when  receiving  from  a  powerful 
local  broadcast  station,  the    signals  may  become  mushy  or  distorted.  The 
"Volume"  control  should  then  be  turned  to  the  left  until  the best  tone  quality is 
obtained. 

U

SE 

of a Telephone Headset. 

A telephone headset may be used  if  desired. 

The  two  holes  near  the  bottom  of  the  control  panel  are   openings  to  pin 
jacks. Push the pin terminals of the headset cord into these holes. 

If it is desired to operate the head telephone receivers without operating the 

loud  speaker,  remove  the  last  Radiotron  at  the  extreme  right,  and  turn  the 
"Battery" control back so that the brilliancy of the filaments is the same as when 
all six of the Radiotrons are in use. 

[12] 

Содержание Radiola 26

Страница 1: ...rtable Super Heterodyne Second Harmonic Instructions Book 5344 A Radio Corporation of America 233 Broadway 10 South LaSalle Street 28 Geary Street New York City Chlcatto Illinois San Franclaco California August 1925 ...

Страница 2: ...Radiola 26 with Home Battery Box Radiola 26 as a Portable Unit 2 ...

Страница 3: ...ch are included Radiola 26 when used in the home is intended to be placed upon the Home Battery Box which serves as a housing for a set of larger batteries The larger batteries are strongly recommended for home use as they provide longer battery life and therefore greater economy The Home Battery Box also contains a separate antenna Coupler permitting the use of an antenna when the set is in a shi...

Страница 4: ... These are connected in two groups each of three cells in series both groups being connected in parallel as 6 Eveready Dry Cell Radio A Butteries No 7111 or 6 Eveready Columbia Ignitor No 6 Dry Cells or 6 Burgess No 6 Radio A Dry Cells or 6 Ray 0 Vac No 1211 Radio A Cells OR EQUIVALENT B Two 45 volt blocks of B battery such as 2 Eveready No 767 Horizontal or Eveready No 772 Vertical or 2 Burgess N...

Страница 5: ...ten possible to tune out the nearby station merely by turning the loop at a right angle thereto The loop may also be attached rigidly at the back of the cabinet where it can be used equally well except that the whole set will have to be rotated to get proper directional effect This is of advantage when the set is being used in camp or is being carried by the handle or under similar circumstances a...

Страница 6: ... sections will fit together in but one way After the three cells of the A battery have been connected remove the packing block by pressing down on catacomb using a screw driver as a lever and pulling the block forward and out through the tube opening Turn the Battery setting knob to the left until the pointer rests on Off Then unpack the six Radiotrons Model UV l99 which will he found in the batte...

Страница 7: ...king Block in Place Ground to the negative binding post terminal of battery No 1 Connect the red wire lead from battery No 1 to the post of battery No 2 Connect the red wire lead from battery No 2 to the post of battery No 3 To the same post connect the lead with the maroon braid having a metal tag marked 45B Then connect the red wire lead from battery No 3 to the post of battery No 4 Finally conn...

Страница 8: ...Fig 4 Battery connections for Portable Unit 3 1 V A Batteries 4 22 V B Batteries Fig 5 Diagram of Battery Connections for Portable Unit 8 ...

Страница 9: ...6 Battery Connections When Using Home Battery Box C Block with A C Green Green Tracer with Yellow T 6 11 2 V A Batteries 2 4S V B Batteries FIG 7 Diagram of Battery Connections When Using Home Battery Box 9 ...

Страница 10: ...tery installation Now insert the Radiotrons in their sockets and the set is ready to use CONTROLS Battery This control serves to turn on and regulate the current to the filaments of all six of the Radiotrons Loss of A battery voltage through use or age is compensated for by this control When Radiola 26 is not in use this control should always be turned as far as possible to the left so that the po...

Страница 11: ...ter much Leave it wherever it happens to lie The two pointers of the Station Selectors should be in nearly the same relative position on their respective dials for maximum signals from any given station By this it is meant that if Station Selector 1 is at 40 that Station Selector 2 should be somewhere near 40 There will always be two positions of Station Selector 2 for each position of the Station...

Страница 12: ... possible to cover the whole wavelength range by slowly moving Station Selector 1 from one end of the scale to the other while keeping Station Selector 2 in its proper relation Always remember to keep the Station Selectors at approximately the same settings This is the easiest and quickest way in which to find stations Control of Volume The proper way to control the volume is to adjust the Volume ...

Страница 13: ...smitting station there are two positions at which the signal strength will rise to a maximum and two others at right angles where it is at a minimum Rotate the loop until best results are secured trying to locate the position of the loop where the interference does not come in but the desired signals do CALIBRATION To enable the most satisfactory service to be obtained from tlie Radiola 26 it is d...

Страница 14: ...lockwise direction than is necessitated by the condition of the A battery or by accidental contact of the filament with the B battery voltage With the filaments burning too brightly Battery setting knob too close to 10 the active material in the filaments is rapidly driven off and the useful life of the Radiotrons and batteries is shortened Should this occur the Radiotrons may be restored provided...

Страница 15: ... an exhausted C battery are distorted signals and a tendency to howl If the difficulty appears to be elsewhere it is recommended that the services of the dealer from whom the set was purchased be enlisted If the set becomes inoperative try interchanging the Radiotrons The second tube from the left when facing the front of the set is the important one Try interchanging this Radiotron with either th...

Страница 16: ...ected in two parallel groups of three cells each in series The exact method of making connections may be best understood by reference to the diagram Fig 10 Connections between cells are to be made by the short jumpers furnished with the Home Battery Box Find the lead with yellow braid and red tracer having a metal tag marked A B Ground and connect its terminals to the two free positive center term...

Страница 17: ...t blocks are used The red lead having a metal tag marked 90B is to be connected to the positive terminal of the last battery block This completes the installation of the batteries in the Home Battery Box The cover should then be replaced and fastened down by its screws Radiola 26 can then be placed in position with the button feet fitting into recesses on the cover of the box and the slot in the b...

Страница 18: ...n indoor type of antenna is used it may consist of a short wire from 20 to 30 feet in length and may be insulated copper wire between No 18 and No 24 B S Gauge run conveniently around the picture molding Care should be taken to keep this wire several feet or more away from any adjacent telephone electric light or power wires If an outdoor antenna is employed it may be from 15 to 35 feet in height ...

Страница 19: ...e attached permanently to the said apparatus and devices or if this is impracticable on account of size then on tags or wrappers attached to the said apparatus and devices or on cartons containing the same This license notice is as follows In connection with devices it sells Radio Corporation of America has rights under patents having claims a on the devices themselves and b on combinations of the...

Страница 20: ......

Страница 21: ...STATION LOG Date Call letters LOCATION Left Hand Right Hand Frequency in Kilocycles STATION SELECTORS ...

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