Sunday, May 27, 2007

Surveying the masts

I meant to put this one up ages ago, but forgot all about it.

Anyway, over the last few weeks we've had to check and adjust all our masts and aerials, as the build up of snow on the stays pulls them off centre. As ever, it was good to get outside, although operating the theodolite in thin gloves froze my fingers very quickly!

Jules surveying

It's way darker than this now, so I'm going to try some moon photos.


Anonymous Skinny D said...

Hi Dave, whats the issue with the masts being a bit out of alignment? What sort of aerials are you using, I would have figured a load of copper in the air would be all you'd need...

Whats the deal with the theodolite, do you get a load of angles from it that you then take back inside and put into a computer for plotting? I'm kinda interested as its the sort of thing I may use for setting a site out.

Cheers, Skinny

7:58 am GMT  
Blogger David Vaynor Evans said...


For HF Coms we're using three di-poles - a north-south, an east-west and an omni-directional jobby. For VHF there's a standard marine spec onmi on the roof (which snapped a stay in the storm and set the whole office vibrating!).

The other masts that concern me hold met instruments. At a rough guess, I there's about 60 instruments mounted over three masts.

We're only checking for straighness and angle of lean. Although the ice is moving, it's all moving together so difference between masts is assumed constant.

I'll see if I can find a plan somewhere


10:36 am GMT  
Anonymous Anonymous said...

Hey welsh dave, this looks a bit more exciting than surveying building sites like joe! it also puts his complaints of frozen hands to shame! Heulwen.

12:41 pm GMT  

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