Work Day 3rd February 2018

LCP
The simulator was given a run following a couple of weeks when it wasn’t checked. Happily all remains serviceable.

T86
More of the same. Prepp’ing the T86 cabin and aerial system for a repaint. Two photos below showing the treatment of corrosion on the Ward Leonard shelves:
T86 Corrosion Treatment wm.jpg

and the top of the pedestal where the corrosion was rubbed down but not yet treated:

T86 Corrosion on Ae Assembly wm.jpg

Once the corrosion treatment has done its stuff an anti-corrosive primer will be applied. Note that the corrosion treatment is blue, the colour when it is still wet, when dry it turns black.

One challenge on the aerial assembly is how to get at all the awkward places to rub down as many gaps are too narrow to get your hand in. Never mind, we’ll find a way. A discussion was also had on the colour of the paint used on the aerial reflectors as it’s certainly not NATO Green. It looks like the original colour applied to the Swedish Bloodhound kit, or at least the radar. We also discussed how to treat the several paint blisters on the front of the transmitter aerial.

Included with this blog is a photo of a sight that all T86 guys will be familiar with it shows the indicators in the pedestal when the aerials are in one of the azimuth end stops, in this case the anti-clockwise end stop has been activated.

T86 In the end stop wm.jpg

In an operational radar the aerials in an end stop usually indicates one or more of the power transistors in one of the drive amps in E Rack has gone. We, on the other hand, managed to accidentally push the aerials in to the end stop. So that we can move the aerials we have had to patch in a -24V supply to remove the brakes when required. There is no plan to drive the aerials using the Ward Leonards and the drive motors; well, not unless someone has a 3-phase supply and that other commodity – money.

In the Workshop
Work is in hand on bench testing a faulty A700 memory card, capacity is 1 Mega Byte! The card has two PCB’s, a mother and daughter arrangement holding a large number of 4864 memory chips (64K x 1 DRAM) and the control circuitry. The memory card and its edge connector ‘adaptor’ is shown below. Bear in mind we have no board test equipment, not even a design specification, let alone a test specification! More information on testing and fault finding this card will be covered in future blogs.

ME147 Test Bench wm .jpg

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