SCREEN GRID ON S.W. ADAPTER

Radio Record, Volume II, Issue 1, 20 July 1928, Page 13

SCREEN GRID ON S.W. ADAPTER

CORRESPONDENT asks for particulars as to how the screen-grid R.F, unit can be connected to the shortwave adapter. This will be fairly obvious to many, as it means just the same treatment as is given to the detector portion of the short-wave receiver. It would be best to mount the unit and adapter one one board as a complete unit. ‘*Megohm" will look into the matter, and any points of importance will be dealt with next week. The construction of short-wave reeceivers and adapters is going apace just now, in preparation for the Tun-ney-Heeney fight, and the screen-grid unit will be found an invaluable addition. Constructors of adapters are reminded to ascertain which pole of the A battery is "earthed" in their broadcast receiver, and to earth the same in the adapter... In the "isteners’ | Guide" diagram A positive is earthed, so if A negative is earthed in the broadcast receiver, it only means in the adapter altering the earth connection from filament positive to filament negative, where shown just above the valve base in diagram. If this point ‘is not attended to it may result in the A battery being short-circuited.