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Member postings for Geoff Theasby

Here is a list of all the postings Geoff Theasby has made in our forums. Click on a thread name to jump to the thread.

Thread: A New Golden Age of Model Engineering Exhibitions
22/10/2018 17:10:40

A few years ago the Makers shared with M. E. at Sandown Park. I gather that they grew so fast they now have their own show.

Several groups now hold shows at 2-year intervals. Manchester in Feb 2019!

Geoff

Thread: A question for Thomas the Tank Engine fans
26/09/2018 05:43:05

Frances, the UK road sign for a level crossing is still the silhouette of a steam locomotive.

Geoff

Thread: Beer and Grapefruit
15/09/2018 04:04:17

Long term strong lager drinker here. However, I do like Speckled Hen, Abbotts Ale, Bishops Finger, and, of course, Old Peculier and Taylors Landlord. Something I can wrap my tongue round.

I don't like cold beer, it gives me brain freeze and takes away the taste.

Geoff

Thread: Never Throw Anything Away
03/09/2018 21:08:33

My wife suspects I'm a hoarder, but when I refer to her stash of knitting wool she goes all coy...

Geoff

Thread: LED lighting
02/09/2018 09:52:26

Yes, the sticky LED strips do work, I use them a lot. In a harsh environment, put them in a clear plastic tube for protection.

I just fitted LED lighting in my garage, using a 12 volt 'wall wart' and two LED panels intended for use in car interiors, a couple of quid each from Amazon.

Geoff

Thread: Is Model Engineering in Decline
18/08/2018 10:45:52

Dave,

I did meet a duke once, opening an event I was attending. Old tweed jacket, baggy trousers, apologised for looking like a gardener...

Thread: Are Model Engineering Exhibitions The Same
15/08/2018 10:02:17

Mark Rand, why is it 'obvious' that people should move right to left at exhibitions? I like to move clockwise round a show or rally, as do most others, as you said. Are you the only one in step?

Geoff

Thread: Let's hear it for British manufacturing!
06/08/2018 13:37:11

Where do I start? Special steels, Airbus wings, Honda/Nissan/Toyota, AMRC, medical joints/scalpels, JLR, ARM microprocessors, electronic games, <pause for breath>

Geoff

Thread: Neil's Irrelevant Press Release Thread
31/07/2018 11:22:53

Not to mention loud exhausts, go-faster stripes and an aggressive look...

Thread: Songs for the Workshop
26/07/2018 20:54:06

Bazyle, you mean like, Highflying Scotsman, and Orange Blossom Special, by The Spotnicks?

Geoff

26/07/2018 01:33:21

When I'm cleaning workshops - George Formby

Geoff

25/07/2018 11:23:50

DTI - The Shadows

The magical Mrs Clamps - The Shadows

Needles & Pins - The Searchers

Geoff

Thread: Am I getting an irritable old git?
01/07/2018 20:37:44

Deborah doesn't like it, the way I comb my hair

Deborah doesn't like all the clothes I wear

playing all my records, singing to the band

but I am what I am and I'm gonna keep a rocking this way

I'm a rockabilly rebel...

We are ailing, we are ailing, rheumy eyes, and balding pate,

we are ailing, we are ailing, trembling hands and stum

bling gait.

The old ones, Darling we're the old ones, and old ones shouldn't be afraid.

to live, love, as the years roll on, for we won't be the old ones very long...

Cheer up, we're not dead yet!

Geoff

Thread: homemade anvil.
28/06/2018 10:05:32

I have, with permission, a short piece of Welsh Highland railway line for an anvil. There is a corner of an English workshop that will be forever Gogledd Cymru.

Geoff

26/06/2018 16:47:39

Yes. An iron stand will make the hammer 'bounce,' whereas a log or stump is 'dead'.

Geoff

Thread: Meteor detecting
20/06/2018 14:14:51

I forgot to add, simple meteor detection works better at lower frequencies, below 150 MHz.

Geoff

20/06/2018 14:03:15

Yagis need pointing, but at what? The radiant won't help because that's where the meteors 'seem' to originate, but are actually seen at widely separated angles. The gain provided by a yagi is not really necessary as the signals are generally strong enough. A turnstile needs no directivity.

Pointing the yagi upwards by 10 or so degrees minimises signals from terrestrial sources in that direction. You need a vertical polar diagram to show this, rather than the usual horizontal polar diagram, which shows the gain pictorially using the aerial location at the centre.

20/06/2018 12:40:51

Height doesn't really matter because you want it to 'look' upwards, any other signals are unwanted. Some mount it in a foil-lined trough, but the jury is out on its effectiveness. Take care with the feed arrangements, one dipole is fed 90 degrees out of phase with the other, it is easy to do. Google 'turnstile antennas'.

Geoff

20/06/2018 10:55:48

The 'blob' is not necessarily a point of maximum signal, but the meteor exploding part way though its final descent. Yes, polarisation of received signals happens all the time, but is most noticeable in faint signals where it means the signal strength may reduce to below the noise.

To counter this, a 'turnstile' or crossed dipoles aerial may be made, which will pick up any polarisation whatever it is.

The doppler shift still applies, but the meteor isn't heading for 'you', the trail begins where the meteor hits atmosphere dense enough to be resistant, and stops when the meteor burns out.

I was listening this morning and didn't hear any either!

Geoff

20/06/2018 08:55:24

Early? I'm often conscious, if not compos mentis, earlye in the morning.

Geoff

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