Under the heading of Transmitters and Transceivers, some of the Types listed in the Table below are shown, but where there are obvious similarities, like for example between Types 3 - 9 and 12 - 13, only one is mentioned in any detail.

  From this introduction you will see that it is not going to be easy to follow a straight line (as it were) but we will do our best both under the Transmitter and under the Receiver sections. Don't be thrown (too much anyway) when, after clicking on the link for Type 1 you get a "TYPE 2" in return; it is correct!

  We entered WW1 using basically Type 11 and Type 11* sets (Type 1 having become rapidly obsolete) and also Type 4 sets, and all this is documented under the early 20th century W/T 1900 to 1913 on this site. We left the war still using these two systems and they were still in use throughout the fleets in 1930, but things had changed. Whilst the the spoken names were still the same (2 and 4) the written name had changed to Arabic from Roman, so we had Type 2 and Type 4. But, more confusingly, much of the circuitry of these system were changed for modern equipment but the system stayed. The HF section which was originally a spark transmitter in Type 2 was replaced by a HF section which had a valve. This was a step forward, and they named the HF section "Transmitter 5C". Not long before that, the Type 5 set, the old Portable (see 1900-1913) as still going strong, and it was a spark transmitter. It must have been confusing to them. So, don't be confused if you see a SET TYPE, each with a different number, using the same HF transmitter (for example) as another different SET TYPE.