Hello.  This web site is packed full of jargon, outfit letters, nomenclature etc etc, therefore the search for detail is complex although straight forward once one knows how to use the system.

Not only must one 'Narrow ones search options' but one must experiment with inputs.  For example, to find a radio set designated TR5206 HF [there isn't one incidentally]  one must drop the HF bit [it is unnecessary] and then key in TR5206, NOT TR 5206.  TR space 5206 is a 'rubbish command' and it will therefore return a 'rubbish search'.  Keying in TR5206 returns a negative find as one would expect.

Take for example the Marconi Transmitter NT204 which the navy called the Type 640 Transmitter. There are no fewer than 86 mentions of this wonderful transmitter on this site. If one was to key in 640 to the search box, rather than returning 86 x 640 in a long string, it would return ALL the pages on which 640 is mentioned and on many, in more than one place. Assuming that the command was relevant and intelligent, the pages returned [and there might not be a single mention of the word 640 in that returned list] will have to be searched individually as follows.

Select a page from the search list.  When on the page, click on EDIT and then on FIND ON THIS PAGE.  In the find box, type in the device you want  [e.g., 640] and the first mention on that page of the 640 will be highlighted for you. Just along to the right of that 'find' box you will see a 'next' command. Click on it and if there is one, it will show you the second mention of 640 on that page etc etc etc. Use your browser BACK button to return to the search list and select the next page. Repeat the EDIT/FIND ON THIS PAGE process and then click on 640 already in the find box.  This will highlight the 640 in blue and show you the first mention of 640 on this new page.  Continue until you have searched all the pages found in the basic search or until you find the specific detail you want.

ABOVE ALL ELSE please remember that this is a Royal Naval equipment site. There were many radio and radar equipments manufactured by many countries which were excellent pieces of kit, but the UK Ministry of Defence did not purchase them although they may had tested them with a view to procurement. Equally, the Navy had a whole suite of fine equipments, some not commercially available to the telecommunications market, which served a highly mobile global and active maritime force through two world wars and a large portfolio of national and international events between those wars especially post second world war. It is these NAVAL EQUIPMENTS which are the subject of our story. We are of course au fait with other non-naval equipments but this site does not address or discuss that awareness.