Amplified ferrite antenna demo on LW
HTML-код
- Опубликовано: 30 июл 2024
- Like most small Chinese receivers, the DE 1103 is deaf on LW.
Here is a short demo of my MW-LW amplified ferrite antenna with the Polish station on 225 kHz. The DE 1103 alone does not receive this station at all.
When the ferrite antenna is switched on, rotated to the right direction, and properly tuned, this station is heard loud and clear.
That ferrite antenna was built from scrap, using the long ferrite rod and variable capacitor from an old transistor radio. Only the RF amplifier (with only one FET) circuit was bought. The output can be fed directly to radios that have an antenna input working with LW and LW. But in most cases, I use a smaller ferrite rod with a few turns of wire as an inductor which I place next to the radio's internal ferrite rod. 
Наука
Great work and excellent demonstration of the results, Jean-Luc! 73!
Thanks Matthias. 73 JL
Wow! That is a million times better built than mine. You could even build & sell a unit like the one you have shown professionally. Many congrats, thanks for sharing & 73s!
Thanks for your comment.
It actually took a long time to gather and assemble the various bits and pieces of that unit ! So it was only a one time project. It would take industrial methods to produce such units at reasonable cost ! 73 JL
Hi Jean-Luc, amazing home-brew antenna and great demonstration of performance. AS MRD said, it looks very professional. 73! Clint
Hi Clint, thanks for your comment. In fact the inside looks less professional than the outside :-)) 73 JL
OMG! This wonderful device is sure to detect deep space signals!
Amazing job
Nice creation 👍
Nice! If only if I had the money to buy the parts, and also had the schematic diagram for this. You should sell these on Ebay as a kit form or assembled. The Kaito KA35 is my favorite active loop antenna, but Kaito shut the factory down to prevent further manufactuering and improvement of the Kaito KA35 active loop antenna. Right now I am only struggling, trying to figure out what next.
Very strong antenna 73s
Hi. Any link for the full project?
Looks great and works even better. Job well done and very perfessional in design. You could sell these, I'd be the first one to order. I also say when your hobby becomes a job, its not so much fun any more. 73s
Thank you ! It took quite some time to assemble so I am not ready for mass production, lol ! I can't compete with the Chinese ! 73 Jean-Luc
Awesome
I am interested in buying this antenna! How much would it cost?
exelent work. i could share the circuit thank
The radio receiver is turned from a signal of the station by 90 degrees. It isn't possible to understand on how many use of the antenna is justified. Gain power in comparison with the bare receiver is unclear...
I also noticed that.
How to build best arieal for 225khz? Loop? Stick or wire? I have only 10x15m outside for wire
I presume you are in Poland, so you don't have to bother too much to receive this station ! Anything will work, frame or loopstick aerial ,even a a small piece of wire. 73!
@@TSF36 I am in Ireland. 2000km away from PL
In that case, it will be more difficult ! A longwave loop antenna is a necessity. You will find a lot of info to build one on the web. It is very easy to make and costs nothing !
@@TSF36 I am trying build shielded ferrite antenna.
Hi Thanks for Sharing this Nice video
Can you describe more in detail in a next vidéo the detail of this antenna, i would Like To build similar one
Best 73
Wow, great looking antenna. What type of single FET RF AMP did you buy? Was it a ready-made amp board on eBay for example? I have experimented with a cheap RF amp from China on HF for SWLing recently. 73 ADAM
Thanks, Adam ! Yes it is a cheap ready-made PCB. Works OK though. 73 Jean-Luc
@@TSF36 Thanks Jean-Luc. I see my amp goes down to 100khz so I may give this a try. One last question if I may.... presumably you have a pickup coil along the main rotatable ferrite bar.
Did you wire the amplifier into the lead connecting the pickup coil to the portable radio (like a PRE-AMP)?
MERCI POUR VOTE ASSISTANCE! Adam
@@M6RDPadam The ferrite bar has only two coils (MW and LW) which are wired to the input of the amp. The output of the amp is fed directly to the receiver antenna socket (or to a small inductive coil for receivers with no LW/MW antenna input) 73 Jean-Luc
Ah, thanks. So where does the tuning capacitor go: before or after amplification? Merci encore. Adam
M6RDP The variable capacitor is in parallel with the lw and mw coils before amplifier, just an ordinary tuned circuit ...