. QST . IzegemVU2GB, G. A. W. Ballantyne, BombayYV5BE, Carlos Lenfant, Chacao, Miranda 38 QST for Jhamt ^qjuipmimL — The Viking Adventurer THE Adventurer is a small transmitterwhich, while no doubt having special appealto Novice licensees because it is crystal-controlled and operates at a 50-watt final-ampli-fier input level, also would be useful as an exciterfor a higher-power amplifier in the to The power output should be ample fordriving a tetrode of fairly large power input. Thealuminum cabinet has been designed for good » The Adventurer is a two-tube 50-watt input transm
. QST . IzegemVU2GB, G. A. W. Ballantyne, BombayYV5BE, Carlos Lenfant, Chacao, Miranda 38 QST for Jhamt ^qjuipmimL — The Viking Adventurer THE Adventurer is a small transmitterwhich, while no doubt having special appealto Novice licensees because it is crystal-controlled and operates at a 50-watt final-ampli-fier input level, also would be useful as an exciterfor a higher-power amplifier in the to The power output should be ample fordriving a tetrode of fairly large power input. Thealuminum cabinet has been designed for good » The Adventurer is a two-tube 50-watt input transmitter covering theamateur bands between .?..S and 30Me. The dual-range milliammeter(0-20 and 0-200 ma.) can be switchedto read either grid current or platecurrent in the final amplifier. The con-trol at the upper right is for the 700-niii. variable output rapacitor of theamplifier pi network. The slide switchjust below it cuts a 700-/i/af. fixed cap-acitor in parallel for additional shielding and the 115-volt and keying leads (theonly ones that have external connections) arefitted with harmonic filters for the TV frequen-cies. The transmitter is available only in kit form,and the only accessories required are a key andcrjstals. There are two tubes, a 6AG7 oscillator and807 amplifier doubler. The oscillator uses thePierce-type circuit with the crystal connected be-tween grid and screen, output being taken fromthe plate. Conventional parallel tuning with ca- pacitive coupling to the 807 grid is used in theoscillator plate circuit. The 807 plate tank is api network with constants selected so that loadsranging 50 to 600 ohms can be fed. In both tanksthe various bands are covered by tapped tankcoils, the unused portions of which are shortedout by the bandswitch. Both coils are sectional-wound to reduce the coupling between the activeand shorted portions and thus minimize losses in
Size: 1595px × 1566px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
