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RADIO AGE for January, 1927
Detail of Coupler
A GREAT many of the requests received in this office were for the details of the coupling unit on which in this issue, on page 19, are given the number of turns for the plate, grid and pickup windings. The wire used is No. 26, DCC, and the stator form is 3 inches in diameter, with the rotor being 2l/2 inches in diameter. The connections are shown in detail at the left of the coupler sketch, while the proper method of wiring them in is shown in the pictorial representation on page 21.
For the more advanced experimenters we are again showing the schematic circuit of the receiver, with slight changes made in it since its first appearance in November. One departure from the original one is the insertion of a C battery in series with the center tap of the loop which will have a tendency to further sharpen up that circuit. This is only suggested for those living under the shadow of a broadcasting station in some of the metropolitan areas.
Tendency of the intermediates to oscillate is suppressed by means of the C battery tap going to the filament terminal of all of the RF transformers, and the first audio. Grid bias is given the last audio where a UX112 is used, this bias being the full voltage of the C battery, 71/2 volts.
Two ten ohm rheostats are
The Magazine of the Hour
19
EVERY NIGHT LOG
Kc
Stn.
Loop
Osc.
1010
KPRC
61
60
1000
WPG
62
62
990
WGN
64
63
980
KOIL
65
64
970
KDKA
66
65
960
KSBA
67
66
950
WGES
69
68
940
WSMB
70
69
930
KOA
71
70
920
KWKH
73
72
910
WJAZ
74
73 1
900
WBZ
75
74
890
WJAX
77
75
880
KFAB
78
76
870
WCBD
79
79
860
WEEI
81
80
850
WWJ
83
81
840
KRLV
85
84
830
WPAP
86
85
820
WDAF
88
87
810
WEBH
90
88
800
KTHS
92
90
790
WGY
93
91
780
CKY
94
93
770
WTAM
95
93
760
WO A I
98
96
750
WHT
100
98
740
KMMJ
103
101
730
None heard
720
wcco
106
104
710
WLW
109
107
700
WSB
111
109
690
None heard
680
WOS
113
112
670
WQJ
117
115
660
WJZ
120
118
650
KMA
121
120
640
KFI
124
123
630
WBAP
126
124
620
woe
131
129
610
WCFL
136
134
600
KFRU
139
137
590
WIP
141
140
580
WCX
143
141
570
WHO
151
149
560
KYW
158
156
550
KSD
163
160
Detail of the oscillator coupler No. 26
DCC wire is used in all windings. The
turns are shown in sketch
provided, one for the filament control of three of the intermediate stages while the second one is used for the filament control of the first and second detectors. The tubes to be used are noted in the pictorial representation and this scheme should be followed for best results.
While the midget condenser used for balancing the loop is placed on the panel where it may be easily reached, in actual practice it has been found possible to place it back of the panel and once adjusted for a certain tube in the first detector stage, it can be left alone. Perhaps the average set builder will like it on the panel so it is shown in that position. By means of it the loop may be made either sharp or broad. Switching around the two outside loop terminals may make a difference on the tuning of this midget condenser, and it is rec
RHEOSTAT VAR. RESISTANCE RHEQSTi*
This sketch shows how the parts should be laid out on the baseboard