Work Day 18th September 2021

T86

More painting of the aerial assembly, especially the hard to get at places. The aerials are on their back for this latest painting session. The two photos below show before and after painting of the waveguide assembly fed by the receiving dish.

LCP

Refitted the small telecoms unit on the test equipment mounting plate. A half hour job that took two hours! Reason, the golden rule of re inserting screws from removed units was not observed so could not find the original mounting screws. The photo below shows the comms which has been corrosion treated and repainted and the test equipment on the mounting plate.

The simulator had not been run for a few weeks so was switched on at the end of the day. Unfortunately a few faults were immediately apparent:

  • The FT81 monitor gave no display so the boot up process could not be monitored.
  • Yet another power supply RIFA filter capacitor went up in smoke
  • … and the simulator failed to boot

For the past few simulator sessions the FT81 had no vertical sync on switch on but eventually settled down, so is the ‘no display’ related? It has been removed for repair as has the 15V 8 Amp power supply.

The failure to boot appears to be an intermittent problem with the digital Output box but needs investigating further. The Argus was loading the software, according to its activity LEDs but without the FT81 it couldn’t be determined at which stage the boot up was stalling. Possibly reseating cards will fix but with limited time this will be a job for the next visit.

Simulator Booting

The green LED on the ME1461 flickers on loading software as is normal and the processor LEDs then look to be in a loop waiting for something. There are no LEDs on any of the Digital output cards and the displays were showing the firmware display – no Bloodhound boot display. When fiddling about removing the FT81 I turned around and the Bloodhound boot display had magically appeared, there were also a total of three LEDs on a couple of Digital Output cards. A reboot simply showed the firmware display again and no boot up display. On the occasion when the boot display did show I pressed the Simulator button but nothing happened. Finally; when the boot displays appeared the Mode Change Not Allowed message was NOT present which means the Argus is seeing the required inputs. All four CHARGE channels are also OK. I don’t think the power supply with the blown RIFA is responsible. Problem with the PeriBus card on the digital output box (maybe).

Pete H

Work Day 11th September 2021

T86

Finished hand crafting the temporary pedestal roof covers to use when working on the aerial system once the roof is painted.

Top coated the pedestal roof with NATO Green. If the T86 was repainted before its end of service life it would have been NATO Green, I assume. The pedestal roof will receive two coats of NATO Green and the black for supports and the base of the actual pedestal. See photo below.

Away from Cosford restoration of removed fittings continues. The latest items to be restored are the two viewing windows for the course and fine elevation synchro dials.

LCP

A job that been on the ‘to do’ list for a while is to remove the duct cover that is below the test equipment holders on the wall in front of M Rack. The cover is secured by screws which are rusted in. The last screw was drilled out yesterday and the cover removed.

Quite a few hidden treasures found as below

A good clean was carried out and new securing screws will be fitted which will involve the re tapping of holes.

The telecoms box fitted to the test equipment rack has been refurbished and will be refitted once the duct cover is replaced. The ‘box’ is brown and has been resprayed brown but not in the original shade. Near enough will do in this case.

The spare monitor is now in the LCP and will replace the U/S monitor when lifting power is available.

Away from Cosford the refurbishing of fittings continues. And returned to the LCP are the securing plates for the leather straps that secure the canvas roof awning, new leather straps and the securing plates for the canvas covers over the roof joins.

Pete H

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