. QST . Inside view of the bridge. The resistor connectedbetween the inner conductor pins of the coax sockets isRi. One of the 47-ohm resistors is on the right, connectedbetween the inner conductor pin and the junction of disk condenser and the other 47-ohm the three resistors are mounted at right anglesto each other. The 1000-ohm resistor at the lower left isconnected between the tie point andthc meter terminal. rrn\ 4NTENN4 OPEN-WIRELINE XMTR. ^x<X XT-C3?^ (A). Fig. 2 — At A we see the typical layout described inthe text. At B the schematic shows
. QST . Inside view of the bridge. The resistor connectedbetween the inner conductor pins of the coax sockets isRi. One of the 47-ohm resistors is on the right, connectedbetween the inner conductor pin and the junction of disk condenser and the other 47-ohm the three resistors are mounted at right anglesto each other. The 1000-ohm resistor at the lower left isconnected between the tie point andthc meter terminal. rrn\ 4NTENN4 OPEN-WIRELINE XMTR. ^x<X XT-C3?^ (A). Fig. 2 — At A we see the typical layout described inthe text. At B the schematic shows the actual connec-tions one would make f«)r using the bridge. take the power out of the final amplifier and getit to the antenna coupler, with as little loss onthe way as possible. The Novice will probably wonder why anantenna coupler is used instead of connectingthe open-wire line directly to the output termi-nals of the transmitter. The feeders could beconnected directly to the transmitter, but itgreatly simplifies coupling problems to use anexternal antenna coupler, particularlj if theantenna is to be operated on more than one band. Where most amateurs run into trouble with asystem such as this is in adjusting the couplerand getting the transmitter to load. With bridge inserted in the coax line betweenthe rig and the coupler, it l^ecomes an easy jobto adjust the coupler to the proper operatingvalues. An ideal set-up, for adjusting the coupler,and the link at the coupler, is shown at F
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
