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12 RADIO AGE for January, 1926
The Magazine of the Hour
In this photograph is shown the wired set. Several of the wires were made flexible to take care of final changes in the receiver. Flexible wire may be replaced by busbar.
removed from the influence of the modern high power transmitters the matter of shielding does not enter in to the matter at all.
The receiver was not tried on a Monday, or silent, night since it was felt such a receiver would not be suitable for use by the man or woman interested in long distance work. The best test of a set would be during normal operation with all of the city stations in full blast. Ability of a receiver to sidetrack the locals and bring in the distant signals should be the criterion of any receiver. The staff is working towards that criterion and feels in the presentation of the January model considerable progress has been made.
In closing this discussion we would call attention to the fact that while we specified and made use of a certain set of parts as shown elsewhere in these pages, any parts of equal merit may be used with success in such a receiver.
In the February issue we have another receiver which will be of interest to the cliff-dweller and which will take advantage of the directional qualities of a loop together with the use of tuned r. f. for amplification. The full details together with pictures, list of parts, blueprint schematic and the performance of the set may be expected in the February RADIO AGE which will be on the stands about January fifteenth.
1 Hour's Log
1 Right
j dial
Call
Wave
0
WBBM-WIBO
226
! 4
KSO
242
! ?y2
WMBB
250
11
WBCN-WENR
266
i i5H
WSM
283
! 16
WKAR
285
1 17
WBAV
294
i i9
KPRC
297
20^
WLIB
303
2iy2
KDKA
309
1 24^
WGR-WSMB
319
| 25
KOA
322
j 26
WSAI
325
I 27
WBZ
333
I 28
WJAX
337
I 30
WLS-WCBD
345
i 32
WWJ
352
S 36
WGN-WEBH
370
j 40
WTAM
389
j 42^
WHAS-WHT
400
i 45
CNRM
411
? 46^
WCCO
416
| 48
WLW
423
| 49
WSB
428
! 50
CNRO
434
| 53
WOS
441
j 55
WQJ-WMAQ
448
! 61
WBAP-WFAA
476
| 63
woe
484
j 77
KYW
536
— «~| Further Data On December Set
In the December model it was found more volume could be secured by eliminating the two neutralizing capacities shown in the pictures and the diagram. Probably with some other type of tubes such neutralizing capacities might be used, but with the set as pictured their use is not as desirable if full strength of signals is wanted. The addition of the grid bias to the r. f. tubes as detailed in the foregoing account of the January model also helped somewhat on the selectivity of the set.
When the larger value condensers (SilverMarshall .0005) were used in the December model the higher range of the set was increased so as to embrace KYW and KSD without much of a sacrifice on the extremely low wave stations.
After these changes the three dials shown oh the panel of the December model (Bremer-Tully vernier dials) ran practically true to form throughout the entire range.
By a little experimenting this model with its three controls could be reduced to one control, since the Silver-Marshall condensers have a little drum mounted on each of the condenser shafts by means of which they may be linked together with fish cord so as to give single dial operation.
The completed receiver ready to operate is shown in a front panel view.