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ortek_service · 28th Nov 2022, 8:13 am

With a bit more trial & error searching, I discovered that the 2.34781MHz frequency was used by some (older?) 'Trend' Telegraph & Data Message Generator equipment that was used by the RAF, on this Air Publications (AP) etc. documents website:
https://www.blunham.com/Radar/APlist.html

And some pictures of this, with the same double-lines above/below "TREND" can be seen in a few Google images, by searching: https://www.google.com/search?q=Tren...x2CL-Foi8RHmqM

So may well be used in something like those (I haven't found any insides-photos yet)

28th Nov 2022, 8:13 am	#4
ortek_service Octode Join Date: May 2018 Location: Northampton, Northamptonshire, UK. Posts: 1,440	Re: TREND SK 947 (Z80) Computer board With a bit more trial & error searching, I discovered that the 2.34781MHz frequency was used by some (older?) 'Trend' Telegraph & Data Message Generator equipment that was used by the RAF, on this Air Publications (AP) etc. documents website: https://www.blunham.com/Radar/APlist.html And some pictures of this, with the same double-lines above/below "TREND" can be seen in a few Google images, by searching: https://www.google.com/search?q=Tren...x2CL-Foi8RHmqM So may well be used in something like those (I haven't found any insides-photos yet)