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Crystal sets, POW radios, spy sets & radio related thread

@Roadster280 , some porn for you ;)


ARCHITECT is on there!

Edited to add: It’s nearly 30 years since I was doing that stuff, but I’d give my right arm to wind the clock back to those times. I feel an Arrse sock coming on with my old callsign :)
 
Come on beards...I look forward to reading this thread when I’ve finished work. There’s nowt new to read though! How about some pictures of home radio based projects, Arduino stuff...etc?
 

endure

GCM
Good news. Read in the local paper last night that Vodafone have applied for planning permission for a 5G mast just up the road from me.

Bad news. The loons know where their next target is.
 
Come on beards...I look forward to reading this thread when I’ve finished work. There’s nowt new to read though! How about some pictures of home radio based projects, Arduino stuff...etc?

OK ... and slightly off thread ...

In the 50’s when being educated at a Grammar School I noticed in the corner of the Physics Lab a large box with two still crated VCR 517c 6” CRT’s and a box of bits including a VCR97 CRT , a partly stripped chassis but complete with HT and EHT transformer ( the size and weight of two house bricks ) and the external case ... it was WW2 Surplus ex RAF . The most important find buried underneath a pile of stripped out resistors , capacitors etc was a six page leaflet on how to convert this unit into an Oscilloscope .

At that time there was masses of cheap ex WW2 radio / electronic kit for sale and many articles in the likes of Practical Wireless on how to make your own TV . I thought a TV a bit too adventurous however an Oscilloscope a definite possibility . To cut a long story short I bought from the school for <£5 the whole lot .

With the help of friends got all the kit back home finished stripping out the chassis to re-use the components and over several months built using the leaflet and some PW magazines a working 6” Oscilloscope . It was a satisfying challenge and I played with it for a while and again sold it on for a profit . I had what can only be described as a shocking moment during construction / testing by giving myself a – 3 kv shock and a very sore finger .

So to the VCR 517 tubes … they were blue/white long persistence display and it took several seconds for a trace to disappear … I did not like that so reinstalled the VCR97 green short persistence tube . It may have indeed been fortunate for other future applications that long persistence display tubes were developed during WW2 .

When I retired I developed an interest in Codes and Ciphers and the work done at Bletchley Park to break Enigma and develop Colossus which was the first programmable Computer . I had read that shortly after WW2 Cathode Ray Tubes had been used as an early form of Computer Memory and in 2015 heard this broadcast on R4 which explains a post WW2 use of CRT’s in that field …


… I now like to think that the development at Manchester University may have been with a similar type of 6” CRT I had “ played “ with as a schoolboy .

As I have posted before …. then I found girls ..

... thread drift ends .
 
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endure

GCM
OK ... and slightly off thread ...

In the 50’s I went to a Grammar School and had noticed in the corner of the Physics Lab a large box with two still packaged VCR 517c 6” CRT’s and a box of bits including a VCR97 CRT , a partly stripped chassis but complete with HT and EHT transformer ( the size and weight of two house bricks ) and the external case . The most important find was buried underneath a pile of stripped out resistors , capacitors etc and was a six page leaflet on how to convert this unit into an Oscilloscope .

At that time there was masses of cheap ex WW2 radio / electronic kit for sale and many articles in the likes of Practical Wireless on how to make your own TV . I thought a TV a bit too adventurous however an Oscilloscope a definite possibility . To cut a long story short I bought from the school for <£5 the whole lot .

With the help of friends got all the kit back home finished stripping out the chassis to re-use the components and over several months built using the leaflet and some PW magazines a working 6” Oscilloscope . It was a satisfying challenge and I played with it for a while and again sold it on for a profit . I had what can only be described as a shocking moment during construction / testing by giving myself a – 3 kv shock and a very sore finger .

When I was doing my radar ticket our lecturer got his head stuck inside the display cabinet. Every time he tried to get it out his nose approached the EHT connector on the tube which made him jerk his head back and bang it on the cabinet.

We turned it off - eventually ;-)
 
Come on beards...I look forward to reading this thread when I’ve finished work. There’s nowt new to read though! How about some pictures of home radio based projects, Arduino stuff...etc?

My ”problem” is that I do comms stuff for work. When I’m done with work, I want to do something else - cooking, golf, woodwork, whatever. I don’t do anything with radios, it’s all fiber optics, but still comms.

It’d be like you coming home from work and building a model police car or something. You playing with radios and electronics is your hobby; mine is just a latent interest. I do however have a challenge that my mate doesn’t think I can do. He’s my best mate, and also interested in woodwork, so we play in my workshop at woodworking, drink beer and listen to music. He challenged me to get it so that when we enter the shop and turn the lights on, the music should start playing. This would involve turning on the amplifier and the TV that it’s connected to, and initiate a playlist.

Sounds like a Raspberry Pi problem to me. Have a photodiode in a dark/out of the sun location in the shop, have it sense the lights coming on and brightness above a threshold, then initiate the amp and music. That’s where I might have to get a bit inventive. I can’t see how to turn the amp on remotely easily. One way would be to capture the IR signal from the remote and replicate that on an IR LED, but that means building a circuit to capture it in the first place, analyse it and then replicate it out again. There’s probably already circuits out there to do that, and possibly even software, but I can’t be arrsed right now :)
 
Come on beards...I look forward to reading this thread when I’ve finished work. There’s nowt new to read though! How about some pictures of home radio based projects, Arduino stuff...etc?
ARRSE is great for discussing stuff and even for inspiration but perhaps not the best place to get detailed instructions and support for radio and electronic projects. There have been requests on other threads for similar, ie is there a project I can get with good instructions and support in case I get stuck. Yes but they don't yet know what they want to build. Suggestions might get a blank stare or a stiff ignoring so what can you do? The raspberry pi thread is specific and there seem enough people doing that to keep it going. The ARRSE model club seems very successful in that there is the military theme, lots of research, tips along the way and detailed photos.

If you want to mix code and "radio", there are various YouTube videos on building Internet Radios, which isn't radio in the true sense but audio streaming. No way to pick that up with a crystal set.

There are simple and not so simple SDR radios built from modules wired together. I haven't built one so can't advise on them. This one is clever. It covers useful MW and SW frequencies and simulates an old analogue dial.

 
My ”problem” is that I do comms stuff for work. When I’m done with work, I want to do something else - cooking, golf, woodwork, whatever. I don’t do anything with radios, it’s all fiber optics, but still comms.

It’d be like you coming home from work and building a model police car or something. You playing with radios and electronics is your hobby; mine is just a latent interest. I do however have a challenge that my mate doesn’t think I can do. He’s my best mate, and also interested in woodwork, so we play in my workshop at woodworking, drink beer and listen to music. He challenged me to get it so that when we enter the shop and turn the lights on, the music should start playing. This would involve turning on the amplifier and the TV that it’s connected to, and initiate a playlist.

Sounds like a Raspberry Pi problem to me. Have a photodiode in a dark/out of the sun location in the shop, have it sense the lights coming on and brightness above a threshold, then initiate the amp and music. That’s where I might have to get a bit inventive. I can’t see how to turn the amp on remotely easily. One way would be to capture the IR signal from the remote and replicate that on an IR LED, but that means building a circuit to capture it in the first place, analyse it and then replicate it out again. There’s probably already circuits out there to do that, and possibly even software, but I can’t be arrsed right now :)
Schrödinger's beard has a solution to that simple conundrum. Simply leave the lights on and the ABBA music playing. Close your eyes and stick your fingers in your ear prior to entry then...on a count of threee..Et Voila!

I'm on lates tomorrow so staying up a bit late tonight. Think I'll pull the Arduino out of the cellar in a bit maybe tinker (re-learn) all the basic stuff I semi-mastered before it got stored away there out of the kid's way in the first place...all that time ago. Might look at some radio options for it.
 
"Hand to bearding stations Hands to bearding stations...all beards muster in the cellar...with sandals...and socks"


2020-09-20 23.14.43.jpg


I'm gonna make something tonight. Got my eyes on an Arduino sonar / ultrasound thing.
Do cats detect ultrasound? Odin & Loki (my little bastards will be in for a right treat if they do!)
 
Update:...

My beard fell of. Made the mistake of either diving in too deep or following a Youtube thing that did not work.. I tried to make a sonar ultrasonic sensor.


Followed all the wireing etc but- code does not work.

Probably my fault but- I'm still declaring war on the c*nt for taking up 3 hours of my time.


I'm gonna do a quick lap of pornhub and get my head down ow.

Will try another time.
 
Update:...

My beard fell of. Made the mistake of either diving in too deep or following a Youtube thing that did not work.. I tried to make a sonar ultrasonic sensor.


Followed all the wireing etc but- code does not work.

Probably my fault but- I'm still declaring war on the c*nt for taking up 3 hours of my time.


I'm gonna do a quick lap of pornhub and get my head down ow.

Will try another time.
If it's ultrasonic it's sonar rather than radar but you should get some returns from a few pings at the hub. :lol:
 
"Hand to bearding stations Hands to bearding stations...all beards muster in the cellar...with sandals...and socks"


View attachment 506013

I'm gonna make something tonight. Got my eyes on an Arduino sonar / ultrasound thing.
Do cats detect ultrasound? Odin & Loki (my little bastards will be in for a right treat if they do!)

Do I take it you are left handed and enjoy a good measure of Whisky ?
 
Just bought a couple of books from Amazon. If there are any ex R/Os on here you might want to have a look at the Portishead Radio book.

Interesting smidgin.

NASA set up an HF circuit through Rugby Radio to communicate with the astronauts during the Mercury and Gemini programmes.

Concorde flew too high and too fast to use satellite comms so after she was out of VHF range she used her own Speedbird HF circuit through Rugby Radio back to BA headquarters.

View attachment 505413
Here's a good read I purchased a while ago regarding the military driving the development of radio

 

endure

GCM
Another Lowe HF125 up for sale on Ebay

 

endure

GCM
Turn that telly off!

Do we have Radio Quiet Zones in UK?

I read that story on BBC earlier and reminded me years ago of an area in USA where microwave ovens are banned because of radio signal interferrence. Closest story can find about it below.

 
Do we have Radio Quiet Zones in UK?

I read that story on BBC earlier and reminded me years ago of an area in USA where microwave ovens are banned because of radio signal interferrence. Closest story can find about it below.

No. Not like that. Local restrictions exist in some controlled spaces and work places e.g. for safety reasons.
No blanket bans against mobile phones and microwave ovens in domestic properties as far as I know. Some people choose to live in areas away from power lines, microwave ovens, mobile phones and wi-fi, either because they believe they are radio sensitive or the just want a simple life. There are some designated EMF quiet zones in USA and Europe: EMF Quiet Zones in the USA and Worldwide

There are some specific restrictions in some areas but these don't affect household appliances. Electrical and electronic goods are supposed to comply with regulatory standards by law, to not cause interference. A lot of crap has gotten through those regulations and been CE marked despite causing interference.
 
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No. Not like that. Local restrictions exist in some controlled spaces and work places e.g. for safety reasons.
No blanket bans against mobile phones and microwave ovens in domestic properties as far as I know. Some people choose to live in areas away from power lines, microwave ovens, mobile phones and wi-fi, either because they believe they are radio sensitive or the just want a simple life.

There are some restrictions in some areas but these don't affect household appliances. Electrical and electronic goods are supposed to comply with regulatory standards by law, not to cause interference. A lot of crap has gotten through those regulations and been CE marked despite causing interference.
Like the cheap microwave we bought some years ago, that interfered with the internal TV signal rebroadcaster and actually worked with the door open. Top investment that was!
 
No. Not like that. Local restrictions exist in some controlled spaces and work places e.g. for safety reasons.
No blanket bans against mobile phones and microwave ovens in domestic properties as far as I know. Some people choose to live in areas away from power lines, microwave ovens, mobile phones and wi-fi, either because they believe they are radio sensitive or the just want a simple life. There are some designated EMF quete zones in USA and Europe: EMF Quiet Zones in the USA and Worldwide

There are some restrictions in some areas but these don't affect household appliances. Electrical and electronic goods are supposed to comply with regulatory standards by law, not to cause interference. A lot of crap has gotten through those regulations and been CE marked despite causing interference.

ISTR that the Jodderell Bank techs would track down leaky microwaves and ask the owners politely could they do something with them. Can't recall where I got that from though.
 

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