Sparks and Sparkers

Written by Godfrey Dykes
© RN Communications Branch Museum/Library

GROUP SUFFIX LETTER MEANING EXAMPLE
Type of Power Supply E Battery supply available when mains power failed. 602E
Portion of set H
L
HF portion only fitted.
LF portion only fitted.
618H
55L
Major modification No letter
M
P
Q
Original set
Set after 1st modification
Set after 2nd modification
Set after 3rd modification
89
89M
89P
89Q
Miscellaneous description S
T
A ship set adapted for shore use.
Transportable version of a normal transmitter.
623S
691T