D/F Outfits FH and FH5.

  Outfit FH was used for working on HF only.

  Outfit FH5 was a direct reading CRDF/Intercept Receiver Terminal for use in surface ships.

FREQUENCY RANGE

Outfit FH - 667 to 20000 kc/s

Outfit FH5 - 1 to 30 MHz

FURTHER READING

Details of FH

Details of FH5