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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: Meteor detecting
20/06/2018 05:06:08

I was going to let Neil explain, but I had this idea...

This is a HDSR display, generated in the computer. It is listening to Graves radar, on 143.0488 MHz, which it can not hear, but when a meteor passes, the Graves signal is reflected, leaving a trail on the 'Waterfall' display.

Imagine a loom weaving cloth, which slowly lengthens, as the shuttle passes back & forth through the 'shed' formed by the raising and lowering of the alternate threads. If something is trapped in there, a lump will form, and be incorporated into the cloth. This is like a waterfall display.


19/06/2018 10:56:37

Bernard Lovell, using ex-radar equipment, at Jodrell Bank in 1946, was the first to discover and detect meteors during the day.


18/06/2018 12:20:28

Hi Neil,

Yes, "tune for maximum smoke"! I'll send you a copy after lunch. You can still buy back numbers!


18/06/2018 10:37:06

You can detect the sun with more than just a satellite dish. I have done that, but I also did it on 145 MHz, see Practical Wireless, January 2018. I can e-mail the article if required. You only need a 2m aerial, I used an HB9CV, feeding a 2m receiver, with the audio taken to a smartphone running a data-logging 'app' like Soundmeter. Then play back the recording into your PC and print as normal. I recommend Amateur Radio Astronomy, by John Fielding, 2nd ed, RSGB. I also find that SDR# is good for use with dongles.


Thread: Show and Tell Event for Forum Members?
06/05/2018 17:33:53

I'll be there on Friday.


Thread: Phone Scam
24/04/2018 16:50:22

Ho Ho, I've been playing this game for a while. I lead them on, saying I've done what they ask, until they get to a point where they ask, "What does it say now?"

I say, "It says this is a scam and you are trying to defraud me"

Oh, I get called all sorts! Instructions to go forth and multiply, to commit various violence on me and disconnect my computer. I say '"That's what your colleague said last week"


Thread: English dialect
16/04/2018 11:21:37

That was a good 'link', David.

I tried Skipton, OK. I tried Selby, OK. I tried RIchmond, North Yorkshire, near where where my family originated, and Wow! Almost unintelligible, with strong Geordie overtones!


16/04/2018 01:21:51

I live near Pismire Hill in Sheffield. Yes, it's ants.


Thread: April fools 2018
01/04/2018 12:42:03

I still like the old Gmail Tap.


Thread: Scrap yards
24/03/2018 12:59:37

CF Booths in Rotherham. Highly recommended, they even cater for railway enthusiasts!


Thread: Driving Wheel?
16/03/2018 17:05:25

Driving wheel is the steering wheel, as in the USB attachment for driving video games, as is the joystick for flight simulators. Alternatively, in the Junior Parker song, it is the provider of power, as it is in a motor cycle, or early go-karts, where only one wheel was powered.

And the sexual stuff, too.


Thread: Stephen Hawking
14/03/2018 12:40:52

Another great scientist who did not get a Nobel prize is Jocelyn Bell-Burnell. She claims that her many later awards would not have been granted to a Laureate.

I claim to be one of the non-scientists who not only finished A Brief History of Time, but understood it..


Thread: Helping young people
12/03/2018 17:31:13

I don't think so. Andy has a good point, but in our case the recruits are more likely to be drawn from the recently retired.


Thread: To the ME editorial Team
02/03/2018 04:04:48

Would that be clubs that notify us, or clubs 'in existence''?


Thread: Maplin
01/03/2018 10:56:58

Yes John.

Another thing, I worked in satellite communications for 15 years, and we began by using discrete logic ICs, and linear RF components. Within 5 years we were having the pcbs machine assembled with vital components only inserted by hand. Every one worked on being powered up, so very little remedial work was required. Include software driven menus, premade cables and ever reducing power needs, they got so small they only occupied half of a standard 1U chassis.


28/02/2018 21:31:31

As for getting something for nothing, the pcb is assembled by machinery, the box can be anything you like, sockets to your taste, left handed front panel, your choice of colour. You provide the power supply. Rather than a neat, sculptured, identikit piece of equipment, you have a personalised item. The £10 kits or modules can be left as pcbs as they are used only infrequently. OK, I am supporting a repressive, communist state. Where were the Maplin equivalents?


28/02/2018 21:18:49

Hi David,

In fact the £80 transceiver is from India, but the same principle applies. Due to modern components, a barebones, pcb only device can be built on a single circuit board, and the 'bells and whistles' provided in software. Auto keyers, recorded announcements, aerial tuners, PA protection, even automatic CW sending (via a keyboard) and reception, waterfall displays, spectrum analysis are all possible for not much extra cost. My point is that these were never available in Maplins, nor almost anywhere else, until the internet made it easy to see what was offered, even to the small, hobbyist market.


28/02/2018 17:35:58

DS1, I can not let this pass. Electronic modules and components, cheap or not, were just not available to the hobbyist until recent years. Just as we can obtain any 'in print' book from Amazon, whereas it took weeks from a bookshop, and we couldn't search their stocks without being in the trade, we are now becoming aware of electronics that were just not available, or didn't exist. Add to that the fragmentation of the hobbyist market into radio amateurs, robotics, drones, makers, micro computers, hi-fi, gadgets etc. In recent months, I have built power meters, transmitters, frequency counters, accurate, drift-free oscillators, motor speed controls, waveform generators, all for under £10 each. I have on order a multiband radio transceiver with lots of facilities, for £80. It needs a case preparing, sockets etc. fitting, but a similar plug&go product ready-built will be £several hundred.


Thread: Parting off blade
19/02/2018 09:26:48

I think it was in 'Instructables'.


Thread: Anyone feel the earthquake?
17/02/2018 20:52:27

Nothing here in North Sheffield


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