Grimeton Radio Trasmission July 4th
Grimeton Radio in So. Sweden is the only remaining LF transmitting station from the 1920s era. It will transmit on 17.2 khz on July 4th only. This is a Swedish national monument and is kept in operation by local hams in the area.
They will be using their original antenna consisting of six 380 ft towers spaced over 1000 feet apart and spanning around 1 mile in a line towards the USA.
They are looking for reception reports.
See the website for full details.
Any idea what kind of antenna it takes in, say, New Jersey to hear the transmissions?
Oops, never mind, my FT1000MP only goes down to 100 KHz.
Ok, let me rephrase, what kind of antenna would I need the next time they run tests on 17KHz?
Would my 500 ft Beverage produce enough signal?
For those who would like to attempt to receive the transmissions:
You can even do it with Spectrum Lab. All you need is a sound card, a big antenna connected to your LEFT channel, and this little piece of software Enjoy everyone!
You need the longest wire you can get, and is practical. You'll pretty much never be able to build a 1/2 wave antenna for it (Looking at I think 10,000 meters long or so).
Originally Posted by K2XT
A loop works pretty well. I just use magnet wire (Spool of 500ft for 3 bucks) and it's looped around my house a few times. Wife hates it.
I believe their original receiving antenna back in 1924 was a beverage type over 9 miles long!
On June 17th I visited the site and met with one of the hams involved with the operation of this fantastic station. His call is SM6CN, Lars.
If you ever visit Sweden, this place is a must see. About 1 hour drive South of Gothenberg.
I used to hear them very well indeed on my little 100 foot loop, unfortunately I've got rid of my old HB rig that used to go down to that frequency.
Did some chiphering.... a 1/4 wave on 17.2KHz is 13,604.5 feet or 2.57 miles.
Hey, I think Tractor Supply sells electric fence wire that length!
Googling "VLF Loop" produced 328K hits. The first few look do-able... tuned loop + low noise preamp. I've built similar antennas (sans preamp) for DX-ing on MF. They worked surprisingly well.
Originally Posted by K2XT
You'll have to do some trimming, I think it comes in either 1/2 mile, or 4 mile spools.... :-) Oh, and most is either stainless, or galvanized, so soldering is gonna be tricky at best. But, for a one time use, I guess you could just wrap it together, and make sure it is dry.
Originally Posted by NA4IT
Actually, this would have been a good project if I had known earlier, but Texas may be a bit too much DX for it.
73, and Good Hunting