DX on crystal set? - UK Vintage Radio Repair and Restoration Discussion Forum

greenstar · 5th Jul 2013, 10:48 pm

I just appeared (about 10.30pm) to receive a broadcast by Korean radio on a basic single coil crystal set! The circuit is nothing special, and have only heard today two other stations, Radio Sabras and another, I think Northamptonshire asian station. But the Korean station (http://world.kbs.co.kr) was identified by them giving their website, and a program teaching the Korean language.
Is this a fluke, or have i somehow picked up something rebroadcast from a satellite?
I made this thing to help assess my aerial (about 100ft), headphones etc - just a 50 turn tapped coil and variable capacitor. As in 'the impoverished radio experimenter', but only got this station when I cut out the aerial coil.

Tony

Mr Moose · 5th Jul 2013, 11:19 pm

Hello,

If you look here you will see that they broadcast on short waves on a relay from Woofferton in the UK.

http://world.kbs.co.kr/images/about/...e_e_130331.pdf

Yours, Richard

greenstar · 6th Jul 2013, 9:10 am

Richard, thanks. Strange that it's these three stations of all the AM broadcsts in the UK! I hadn't thought to consider SW or that a Korean station could be relaying from a UK transmitter. It is clearly not a very precise instrument - I look forward to further refinement!
Tony

Radio Wrangler · 6th Jul 2013, 9:34 am

Looking at most crystal set arrangements, you will have multiple resonances and so be sensitive on a few frequencies... all it takes is a strong enough signal and voila!

I didn't know about 'foreign' relays in the UK.

David

5th Jul 2013, 10:48 pm	#1
greenstar Octode Join Date: Jul 2011 Location: Leicester, Leics. UK. Posts: 1,685	DX on crystal set? I just appeared (about 10.30pm) to receive a broadcast by Korean radio on a basic single coil crystal set! The circuit is nothing special, and have only heard today two other stations, Radio Sabras and another, I think Northamptonshire asian station. But the Korean station (http://world.kbs.co.kr) was identified by them giving their website, and a program teaching the Korean language. Is this a fluke, or have i somehow picked up something rebroadcast from a satellite? I made this thing to help assess my aerial (about 100ft), headphones etc - just a 50 turn tapped coil and variable capacitor. As in 'the impoverished radio experimenter', but only got this station when I cut out the aerial coil. Tony

5th Jul 2013, 11:19 pm	#2
Mr Moose Octode Join Date: Jul 2008 Location: Gloucestershire, UK. Posts: 1,043	Re: DX on crystal set? Hello, If you look here you will see that they broadcast on short waves on a relay from Woofferton in the UK. http://world.kbs.co.kr/images/about/...e_e_130331.pdf Yours, Richard

6th Jul 2013, 9:10 am	#3
greenstar Octode Join Date: Jul 2011 Location: Leicester, Leics. UK. Posts: 1,685	Re: DX on crystal set? Richard, thanks. Strange that it's these three stations of all the AM broadcsts in the UK! I hadn't thought to consider SW or that a Korean station could be relaying from a UK transmitter. It is clearly not a very precise instrument - I look forward to further refinement! Tony

6th Jul 2013, 9:34 am	#4
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,901	Re: DX on crystal set? Looking at most crystal set arrangements, you will have multiple resonances and so be sensitive on a few frequencies... all it takes is a strong enough signal and voila! I didn't know about 'foreign' relays in the UK. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done