Wurlitzer 3020 - Changing Frequency of Model 215 Impulse Transmitter; Use of Bridging Condenser No. 39851; Setting Frequency Switch; Installation of Wireless System on Power Lines Separated by Individual Watt-Hour Meters

Section II
Installation
Service Instructions
CHANGING FREQUENCY OF MODEL 215 IMPULSE
TRANSMITTER
Should it be necessary to change the frequency on a
wireless wallqox system,
due to inter-location inter-
ference,
it is only necessary to change the crystals in
the transmitters of each wallbox on the .system ( Blue
or yellow crystals supplied by your bistributor) and
to retune the receiver by adjusting the receiver trim-
mers as outlined afore to the frequency of the new
crystals installed.
In changing from red to blue or yellow, turn the
sensitivity control clockwise. Back-off slightly on all
receiver
trimmer screws, counter-clockwise, in se-
quence and in equal amounts and repeat until the eye
begins to. close; then proceed to align as described
afore. In case it is desired to change from yellow to
blue or from blue to red-, the receiver trimmer screws
should then be turned in the clockwise direction in
equal amounts until the eye begins.. to close, after
which the alignment procedure should be followed.
If a yellow crystal is used, turn the frequency switch
on transmitter to the position marked "Yellow."· If a
blue crystal is used, turn frequency switch to position
marked "Blue." (See Figure 14.)
USE OF BRIDGING CONDENSER NO. 39851
When the power lines consist of three wires, one
of which is grounded and the others h!lve a potential
of I 10 volts to ground, or when outlets on a location
are separated by
one or two watt-hour meters it is
usually advisable to have a qualified electrician install
a
bridging condenser to provide an easy path for the
wireless signals. Otherwise, it may not be possible to
operate the wireless selector on the opposite sides of
the lines or the watt-hour meters.
TO OUTSIDE LINES
PART
NO . 39851 . 25 MFD.
MINERAL OIL IMPREG-
NATfD 330 VOLT, A. C.
C:=;;NDENSER
WATT-HOUR
METER
. - r ,
o---------~·~ ~·--------J
MET A i::..---
1
I
CLAD L-J
LINE TO WHICH WIRELESS
REMOTE UNIT IS ATTACHED
LINE TO WHICH
PHONOGRAPH
IS ATTACHED
Figure I 5-lnstallation of Wireless System on Power
Lines Separated by Individual Watt-Hour Meters
Figure 14-Setting Frequency Switc"
Figures 15 and 16 show Bridging Condenser No.
39851 in place on these two types of installations.
TO OUTSIDE LINES
PART NO . 39851
METAL r--1 "'F . 25 MFD. MINERAL OIL
CLAD ~ ,J-, IMPREGNATfD 330 VOLT ,
._ __ ..........__.!J I A . C. CONDENSER
""11 I
L • .J
HOT SIDE OF LINES------
LINE TO WHICH WIRELESS
REMOTE UNIT IS ATTACHED
LINE
TO WHICH
PHONOGRAPH
IS ATTACHED
Figure J 6-lnstallation of Wireless System on Power
Lines Using Three Wires