. QST . acclaimed a great per-former throughout the world. Excellent for fixed station, port-able or mobile operation. Air wound plug-in coils used forgreater efficiency — never obsolete — will take any new for General Class Amateur, Novice, CAP, CD, , Marine and Airport Communications. An out-standing buy, direct from our factory, ready to operate. The 240 is a 40 to 50 watt Phone-CW rig for any freq. to 30 mc, complete with: (8 x 14 x 8) cabinet, powersupply, 40 meter coils and crystal and tubes: 6V6 osc, 807final. 5U4G 6SJ7 crystal mike amp., 6N7
. QST . acclaimed a great per-former throughout the world. Excellent for fixed station, port-able or mobile operation. Air wound plug-in coils used forgreater efficiency — never obsolete — will take any new for General Class Amateur, Novice, CAP, CD, , Marine and Airport Communications. An out-standing buy, direct from our factory, ready to operate. The 240 is a 40 to 50 watt Phone-CW rig for any freq. to 30 mc, complete with: (8 x 14 x 8) cabinet, powersupply, 40 meter coils and crystal and tubes: 6V6 osc, 807final. 5U4G 6SJ7 crystal mike amp., 6N7 phase inver-ter, 2 6L6s PP mod. for excellent audio quality. Weight Mpounds. TVI instructions included. 90 day guarantee. Price$ $25 deposit with order — balance 20, 10 meter coils $ per Band. 160 meter coils $ MODEL 130 FOR 120 TO 130 WATTS MODEL 242 FOR 2 METERS —45 WATTS INPUT LETTINE VFO AND ANTENNA TUNER LETTINE RADIO MFG. CO. 62 Berkeley Street Valley Stream, N. A-27 LOW-LOSS LACQUER & CEMENT • Q-Max provides a clear, practically loss-free covering, penetrates deeply to seal outmoisture, imparts rigidity and promoteselectrical stability. Does not appreciablyalter the Q of R-F coils. • Q-Max is easy to apply, dries quickly,adheres to practically all materials, has awide temperature range and acts as a mildflux on tinned surfaces. In 1, 5 and 55 gallon containers. MARLBORO, NEW JERSEY(MONMOUTH COUNTY)Telephone: FReehold 8-1880 agines the auroral ionization to be composedof hundreds of such meteor trails. This wouldexplain the observed fast-fading or growl of theaurorally-propagated signal. It would also re-quire that the radio-ray paths be nearly perpen-dicular to the trails, or in this case, the earthsmagnetic field. (See Fig. 10.) Calculations have been made by Chapman ^for locating the feet of perpendicular lines fromthe receiver and transmitter to the lines of theearths magnetic field. These calculations relatethe height above t
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
