| Tape Recorder |
Recording of signals |
Geoff's personal equipment used at home and at the school
At least three of these (in addition to the Ferrograph) - different examples can be seen on the 'Wonderstuff' album cover and in Sven Grahn's 1979 photographs
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Various locations (if any still exist) |
| Ferrograph Tape Recorder |
Recording of signals |
Mono recording
Original purpose was to record metsat signals to play back through decoding equipment
Very expensive when purchased - 95 GBP mid-1960s (equivalent to four figure sum at 2009 prices)
Derek Slater personal property |
Part of the Derek Slater collection, passed to British National Space Centre during 2011 and put on open display 2015 December |
| Great Northern Telegraph Co Ltd Undulator |
Creation of paper chart for measurement of parameters contained in HF signals |
Originally on loan from the British Post Office, designed for electric telegraphic signal reception
Modified from original use of ink reservoir to holding felt/fibre tip pen |
Geoff Perry Collection, passed to Science Museum, London in 2018. |
| AEI 8-channel Polygraph |
Analysing/decoding telemetry from Parus and Tsikada satellites |
Acquired by Derek Slater from English Electric - the original source may have been a hospital
Used at the school for monitoring signals from Parus and Tsikada
Later passed to Chris Wood who used it to undertake a more-detailed analysis for decoding Parus and Tsikada - the work he did led on to a small, solid state decoder that he used for reading out the transmitted almanacs |
Held by Chris Wood family |
| Pen Recorder and Power Supply |
Used in conjunction with crystal-controlled VHF receiver to flag when receiver squelch was open during unattended recordings and to record a time signal. It allowed reception times of overnight voice transmissions from Soyuz to be determined. |
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Part of the Derek Slater collection, passed to British National Space Centre during 2011 and put on open display 2015 December
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| Vitatron UR400 Linear Pen Recorder |
Reception of voice from Soyuz |
Proovided timing markers in order to log times of voice occurrence. |
Part of the Derek Slater collection, passed to British National Space Centre during 2011. Timing aid for the VHF crystal-controlled receiver used to monitor overnight voice transmissions from Soyuz. |
