Simple 40 Metres to 10 Metres Small Space Antenna
Vložit
- čas přidán 30. 07. 2024
- The L-shaped doublet: a great way perhaps to get 40-10m in less than 30 feet (9m) of space!
Connect with me by subscribing, commenting and check out my other videos.
73
Tim
G5TM - Věda a technologie
Tim lives in a car. Isn't that amazing!
Good job its a saloon!
if his home QTH is as bad as mine for radio then why not!
I don't get chance to mess about on the radio very often but 95% of my contacts are out mobile. 10m spider beam strapped to the promenade, 20m of cable and a 49:1 earthed to the railings! 😄
@@M7BXRthat’s an achievement.
Cal, thought He slept in the glove box!
...and I live on a hill. 😊
Very interesting, I look forward to seeing how well it performs. Thanks for the video Tim. 👍
No problem 👍
Very interesting Tim, looking forward to seeing this in action.
Thanks Brian!
Back to great videos, good job.
Thanks!
G'day Tim - great video mate. You've given me an 'aha' moment with my TarpTenna - as it was fussy to tune on one of the WARC bands, and I think by adding ladder line instead of wire straight into the BNC Binding post might make all of the difference to be able to tune the crazy impedance. Thanks for your awesome content as always buddy. Cheers!
Give it a go mate!
Hi Tim - about 12 years ago, NG9D published a design for a similar antenna on his CZcams channel, which he developed for use with his PFR3b QRP CW transceiver. This radio has an incorporated balanced tuner and the balanced feedline (window or ladder line) connects directly without the need for a balun. He called his antenna the “Lambda” antenna. Interesting how similar ideas recirculate over the years. I always found this design to be very effective antenna solution for portable use. Thank you for a great video, Tim.
My pleasure! I can't wait to try it out.
Very Interesting....looking forward to your results...
Thanks!
Looking forward to trying that at home. I dont have a lot of space and currently use an autotuner on an endfed which is all over the place due to the small size of the garden. Cant wait to see your results Tim.
Thanks Steve!
The wheel being upside down is really doing a number on my OCD.
Tim is going round the bend
So is my driving on the wrong side of the road lol
I knew someone would see it!
Sun beams, very creative.👍👍👍👍👍
Oh yes all planned!
It might be interesting to know how much the feedline radiates with this setup. In practice, I don't know what it might look like, but I imagine that the currents along the feedline don't cancel out as well as they would if erected as a traditional flat-top or inverted-v. In theory, I might think that wit the proximity to ground being very different from one leg of the antenna to the other, it might generate a reasonable imbalance. I assume the model is simplified to reflect the feed point and the two elements, and the feedline itself is not included? Would be curious to hear what the finger-in-the-air difference is on performance of this guy versus a coax-fed variant (choked at the feedpoint).. but I'd imagine it would vary by band, and if the ladder line does indeed radiate due to imbalance, I guess there are some directions where it might help and others where it might hinder! I have some 300ohm I'd like to get out and experiment with more.
Cheers Tim - great video as always. Mark, 2E0MSR.
Thanks Mark!
I’m very intrigued. I haven’t use a doublet yet. And I’ve never thought of one in an L shape before.
All fun trying!
I like the compromise on the angle of dangles. A good all - rounder. Interesting Tim. Have you built it?
Not yet Tom… on the top of the to do list
Very interesting to say the least tim. Ladder line, umm, and as you know, i only use ant which will work dx only, i dont use ants that might or migjt not work dx hi. I never work local, i want the world hi, or was that Freddie mercury hi. 20m only band open here, so resonant vert every time.
Would love to see you near the coast one day, 20m is open to the uk.
Have a good week. 73.
Cheers Brian you too
Hello Tim Sir
Hello there!
Seriously I have tried playing with ladderline but found it a real pain. I will give this a miss. (not sure why the first part of this comment was deleted - mild humour - but oh well).
For a fast portable operation you need the least amount of fuss possible during set up..ladder line would be my last choice, it can be a fast track to ripping your hair out in frustration...the only exception being the multiband monopole I made some years ago which uses approx 10 meters of 300 ohm ribbon run up a fishing pole...that antenna never failed ..I do like Tim's enthusiasm though and appreciate his time spent making these videos. 👍
Ah ok John. Yes ladderline is marmite!
Indeed .. it’s definitely one on the “I need to try this” list. IF it comes off it’ll be a good alternative but ladderline is a bit of a lottery for some bands. However if I get 40 plus three or four more tuneable I’ll be happy. 73 and thank you for your kind comments 👍
Sounds complicated 😕
Just hang out an end feed half wave ( 49:1 transformer ) 😊
de G4XJC
Done that and still do. Thing is I’ve got an inquisitive mind!