Page:March 1916 QST.djvu/11

50 wide; the side panels, 15⅝ inches. Only the center panel is used for the mounting of apparatus pertaining to the transmitting set.



When completed, the set will consist of a one 1 kilowatt closed-core magnetic leakage transformer having 5 primary variations of power operating on 220 volts and a secondary potential of 12,000 volts; a compressed-air spark gap with air pressure gauge-maximum pressure 50 lbs. together with high pressure pump conveniently located for use while at the key; an 8 x 10 glass plate and a three-fold protective device consisting of a double condenser, graphite resistances and 3 point gap. Two pilot lamps, placed above the meters serve to illuminate the entire board; All switches, fuses, meters and apparatus requiring adjusting are mounted on the front of the board while the transformer, spark gap, condensers and oscillation transformer are mounted on iron frame work made of pipe to form an adjustable shelf in a manner common in switch-board construction. Low down in the cen-condenser in 4 sections&mdash;each section consisting of 12 plates and the whole connected in multi-series, adjustable in steps of 6, 8, 10 and 12 plates from the face of the board (not shown in picture as this has only recently been completed); a series condenser; an oscillation transformer&mdash;Blitzen Radio coupler revised to make possible its adjustment from the face of the board; (also not shown in the picture) three “Kernel” switch-board meters&mdash;ammeter, voltmeter and radiation ammeter. ter of the board is placed a “United Type” or loop-aerial switch, so far in receiving, however, the best results have been obtained with a plain straight-away connection. Two 15 ampere, 250 volt refillable cartridge fuses protect the entire board.

Two 6 ampere, 250 volt cartridge fuses protect the condensers provided to carry off the small charges from kick—backs; while the other fuses are provided to protect the voltmeter and pilot lights.

Special License and Commercial stations have been requested by the Government Radio Service to keep a record of interference experienced, by the operators in the course of their regular duties. This report is to be forwarded to the Radio Inspectors weekly. This is to contain notes on, interference of the following character: “Amateur broadly tuned,” “Amateur interference on &mdash;&mdash; meters,” “&mdash;&mdash; station testing on &mdash;&mdash; meters.” The reports themselves need not be more formal than a memorandum. It is not intended to adopt heroic measures nor would it be desirable for an operator to deliberately look for interference; the Department simply wants the actual interference which an operator experiences in his regular work. A great deal of interference is caused needlessly and every operator should use a little care in testing when he might cause interference. If you are going to test, do not send by the hour or even fifteen minutes without listening in for possible interference.