RECEIVERS

Buzzer Tester G21

DATE OF DESIGN

1926

FREQUENCY RANGE

WHERE USED/FITTED

Fitted into D/F Outfit SD
Quote.....G21 is a buzzer tester for D/F and was introduced to meet the need for an instrument which could be made to influence each loop aerial to exactly the same extent. If the two loops are identical (as in shore D/F stations) and are equally energised the zero will be found to be at Green 45 degrees. In a ship where the fore and aft aerial is usually smaller than the beam aerial the zero will be found to be nearer the bow at about Green 30 degrees. Unquote.

IMAGES, PHOTOS, DOCUMENTS, SCHEMATICS ETC.

Photographs, Details and Images