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Aerial Variometer for Wireless Sets No. 19 MK. II 12440-PHILA-44

Aerial Variometer for Wireless Sets No. 19 MK. II 12440-PHILA-44; MILITARY U.S. (ID = 1769657) Antenna Aerial Variometer for Wireless Sets No. 19 MK. II 12440-PHILA-44; MILITARY U.S. (ID = 1766463) Antenna
Aerial Variometer for Wireless Sets No. 19 MK. II 12440-PHILA-44; MILITARY U.S. (ID = 1766466) Antenna Aerial Variometer for Wireless Sets No. 19 MK. II 12440-PHILA-44; MILITARY U.S. (ID = 1766469) Antenna
Aerial Variometer for Wireless Sets No. 19 MK. II 12440-PHILA-44; MILITARY U.S. (ID = 1766471) Antenna
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Aerial Variometer for Wireless Sets No. 19 MK. II 12440-PHILA-44; MILITARY U.S. (ID = 1769657) Antenna
MILITARY U.S.: Aerial Variometer for Wireless Sets No. 19 MK. II 12440-PHILA-44 [Antenna] ID = 1769657 1384x2100
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For model Aerial Variometer for Wireless Sets No. 19 MK. II 12440-PHILA-44, MILITARY U.S. (different makers for same model)
 
Country:  United States of America (USA)
Manufacturer / Brand:  MILITARY U.S. (different makers for same model)
Year: 1944 Category: Antenna (Aerial) or Coupler
Wave bands Short Wave (SW only)
Details
Loudspeaker - - No sound reproduction output.
Power out
from Radiomuseum.org Model: Aerial Variometer for Wireless Sets No. 19 MK. II 12440-PHILA-44 - MILITARY U.S. different makers
Material Metal case
Shape Miscellaneous shapes - described under notes.
Notes

Wireless Sets No. 19 Mk II Aerial Variometer: Aerial Variometer matching the british Wireless Set No. 19 Mk II.

The Aerial Variometer was used to match a short rod aerial of 8 or 12 ft to 1/4 wavelength in the frequency range of the W.S. No. 19. On the "low band" (2 - 4,5 MHz), the 0 - 100 calibration is used, the two coils are switched in series and inductance had to be added; in contrast in the "high band" (4,5 - 8 MHz), the coils were switched in parallel, the inductance was reduced, the calibration 200 - 100 is used. The control can be rotated 360°, switches at the 180° positions of the control knob switch the coils in the correct operation.

Variometers must principally be of the same Mark as the Wireless Set No. 19:

Wireless Sets No. 19 Mk I Aerial Variometer: the adjustable resistor R29A had to be factory adjusted to adjust the meter reading, it is placed in the set.

Mk I variometers can only be used with W.S. No. 19 Mk I.

Wireless Sets No. 19 Mk II Aerial Variometer: the adjustable resistor R29A is placed in the variometer itself, the Mk II variometer can be used with W.S. No. 19 Mk II. A variometer Mk II can be used with W.S. No. 19 Mk III, but the R29A might have to be readjusted for correct meter readings.

A variometer Mk II can be used with W.S. 19 Mk. I, but the R29A within the set has to be short-circuited.

Wireless Sets No. 19 Mk III Aerial Variometer: the adjustable resistor R29A is placed in the variometer itself, the Mk III variometer can be used with W.S. No. 19 Mk III. A variometer Mk III can be used with W.S. No. 19 Mk II, but the R29A might have to be readjusted for correct meter readings.

A variometer Mk III can be used with W.S. 19 Mk. I, but as above mentionned, the R29A within the set has to be short-circuited.

(see L. Meulstee WfW p. W.S.19-27 for schematic and details).

 

The Wireless Sets No.19 Mk II Aerial variometers have been produced in United Kingdom and und the U.S. (contract 12440-PHILA-44).

 

Mentioned in Wireless for the Warrior; L.Meulstee (Vol. 2, p WS19-27)

Model page created by Michael Gnaedig-Fischer. See "Data change" for further contributors.



All listed radios etc. from MILITARY U.S. (different makers for same model)
Here you find 352 models, 304 with images and 168 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.




  
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