I am an experience field operator. I appreciate your videos and your ingenuity… I love ladder line… and a resonant dipole is magical. Thanks Linas, great video!
Gosh this is an older video but I can't help but bring some comments. First, thanks Linas you are a techie artist, a real inspiration! I have been using a doublet for 40-10m, really a dipole cut for 40m and fed with ladder line (nominal 450 ohm from Wireman) to tuner in shack. I have noticed the SWR changes over time. Even though I try to keep charts of settings of the tuner for different bands, the settings are different the next week I run through the bands! I found in the comments below, and other clues, that perhaps the ladderline could be susceptible to absorbing moisture and that could be changing the SWR and therefore the settings required for the tuner to find a good "match". This is a revelation for me and makes me consider the options for making my own ladderline feed. There are several things I found online for this, and I have even started to make my own "open wire" feed using copper coated steel wire and plexiglass tubes as insulators, with tie wraps to hold them in place. As always, I keep thinking and trying. And I thank you Linas and other radio ops who share their findings. Keep having fun with RF. 73
I use a doublet at my home station. It works well for 80 thru 6 meters. The only problem I have is when it rains the swr swings up and down and I am constantly having to adjust the tuner.
Thanks for sharing your experience! I'm glad your doublet is doing fine! As to the rain and SWR, well it could be due to the type of feeder line you use. Some so called "window lines" or other lines with plastic dialectric between the line wires are notorious of absorbing moisture ... This brings to the change of feeder line impedance and , thus the SWR. I try to avoid this type of lines and mostly use home made open-air ladder lines where the dialectric is all air. Have fun! 73! Linas LY2H.
Nop, visas rėmas laikosi and specialiai stogo bagažinei gamykloje įrengtų kronšteinų tvirtinimo vietų. Stogas pragręžtas tik saulės elementų laidams į vidų pravesti ( Ir kemperio ventiliacijos liukams įrengti, aišku ) . 73 Linas LY2H
Thanks Dean! It's a good question , really. Theoretically, the proximity of the metal van body to the ladder line could evoke kind of disbalance in the RF current float in the two wires. But practically, I have never noticed something unusual like strange SWR readings etc. And not to forget, there is a Guanella (current) type balun at the end which , I believe, effectively corrects the imbalances out , if any. 73! Linas LY2H
Thanks for a good question! It’s because I don’t have the right automatic tuner for the balanced feeder ! :). And the transceiver’s output is 50ohm unbalanced. So I need a Balanced-to-Unbalanced transformer (BalUn) in order for the unbalanced tuner being able to tune the balanced antenna’s impedance. Actually it is possible to connect the BalUn straight to the unbalanced tuner’s antenna port , or get the Balun installed directly in the tuner. (Like it’s done in my manual tuner MFJ-971). In my case, the cable is so short that it’s the same as if the BalUn would be connected directly to the tuner’s antenna port. Besides, my Balun is also a 4:1 current (not voltage) transformer bringing down the high ladder line’s impedance down to more managable for the tuner impedances’ range. 73! Linas LY2H
Hi, I think the 1.5 mm wire gauge ( I mean, the diammeter of the wire itself, without the plastic coating) should be OK even for the really high power :) For up to 100W , any wire about dia 0.8-1mm would do nicely. I used just a speaker wire split into two because it was what was in my junkbox anyway :) 73! Linas LY2H
Yes, André, you might be right. I am awaiting for my new NanoVNA to come , so I will measure the impedance of the birch trees and pine trees accordingly and will get their Z right into the middle of the Smith chart by trimming the lower branches using the Seitenschneider. Should surely help ! Subscribe for beeing kept uodated on the results!
@@Linas_LY2H Been there! Just be careful of that pine needles, they should have parasitic resonance on higher frequencies.. you should be ok with the birch though! Have fun!
Really enjoy your channel Linas. When camping I use an End Fed Half Wave on 80m which is also resonant on 40m and 20m. If my campsite is smaller I use a coil shortened 80m EFHW. In Canada we have millions of tall antenna supports disguised as trees! de John VA3KOT
@@Linas_LY2H Wow such a great laugh. Thanks you guys for bringing smile and even audio effects in my shack! Keep having fun! I know this is old post but I could not resist sharing my laughter. 73
I am an experience field operator. I appreciate your videos and your ingenuity… I love ladder line… and a resonant dipole is magical. Thanks Linas, great video!
Thanks Randall! Making antennas is as much fun as using them in the field! Merry X'mas and stay safe! 73! Linas LY2H
Gosh this is an older video but I can't help but bring some comments. First, thanks Linas you are a techie artist, a real inspiration! I have been using a doublet for 40-10m, really a dipole cut for 40m and fed with ladder line (nominal 450 ohm from Wireman) to tuner in shack. I have noticed the SWR changes over time. Even though I try to keep charts of settings of the tuner for different bands, the settings are different the next week I run through the bands! I found in the comments below, and other clues, that perhaps the ladderline could be susceptible to absorbing moisture and that could be changing the SWR and therefore the settings required for the tuner to find a good "match". This is a revelation for me and makes me consider the options for making my own ladderline feed. There are several things I found online for this, and I have even started to make my own "open wire" feed using copper coated steel wire and plexiglass tubes as insulators, with tie wraps to hold them in place. As always, I keep thinking and trying. And I thank you Linas and other radio ops who share their findings. Keep having fun with RF. 73
Thank you for the video. I like the idea of one continuous wire on each side of the Doublet antenna. 73 de Bob, M0BOB.
Great job I like how you make your own antennas and prove their worth by making contacts with them.
Another great video!
Great video! Subscribed 73
I use a doublet at my home station. It works well for 80 thru 6 meters. The only problem I have is when it rains the swr swings up and down and I am constantly having to adjust the tuner.
Thanks for sharing your experience! I'm glad your doublet is doing fine! As to the rain and SWR, well it could be due to the type of feeder line you use. Some so called "window lines" or other lines with plastic dialectric between the line wires are notorious of absorbing moisture ... This brings to the change of feeder line impedance and , thus the SWR. I try to avoid this type of lines and mostly use home made open-air ladder lines where the dialectric is all air. Have fun! 73! Linas LY2H.
terrific job Mr balsys good job 73 from kb2uew
Remas ant automobilio kiaurai stoga pragreztas ?
Nop, visas rėmas laikosi and specialiai stogo bagažinei gamykloje įrengtų kronšteinų tvirtinimo vietų. Stogas pragręžtas tik saulės elementų laidams į vidų pravesti ( Ir kemperio ventiliacijos liukams įrengti, aišku ) . 73 Linas LY2H
Very cool setup. Is there any problem with the ladder line running against the metal van?
Thanks Dean! It's a good question , really. Theoretically, the proximity of the metal van body to the ladder line could evoke kind of disbalance in the RF current float in the two wires. But practically, I have never noticed something unusual like strange SWR readings etc. And not to forget, there is a Guanella (current) type balun at the end which , I believe, effectively corrects the imbalances out , if any. 73! Linas LY2H
Tnx
Hi. Why you use caoxial cable? Maybe better connect 2 wire line to tuner. Withoute caoxial cable.
Thanks for a good question! It’s because I don’t have the right automatic tuner for the balanced feeder ! :). And the transceiver’s output is 50ohm unbalanced. So I need a Balanced-to-Unbalanced transformer (BalUn) in order for the unbalanced tuner being able to tune the balanced antenna’s impedance. Actually it is possible to connect the BalUn straight to the unbalanced tuner’s antenna port , or get the Balun installed directly in the tuner. (Like it’s done in my manual tuner MFJ-971). In my case, the cable is so short that it’s the same as if the BalUn would be connected directly to the tuner’s antenna port. Besides, my Balun is also a 4:1 current (not voltage) transformer bringing down the high ladder line’s impedance down to more managable for the tuner impedances’ range. 73! Linas LY2H
hi linas，which type of the line for the ladderline ？1.5²mm can work well？thankyou 73
Hi, I think the 1.5 mm wire gauge ( I mean, the diammeter of the wire itself, without the plastic coating) should be OK even for the really high power :) For up to 100W , any wire about dia 0.8-1mm would do nicely. I used just a speaker wire split into two because it was what was in my junkbox anyway :) 73! Linas LY2H
Hilarious while high performance.
73 from kb2uew
Not a truly balanced antenna if you attach one end to a birch tree and the other to a pine!
Yes, André, you might be right. I am awaiting for my new NanoVNA to come , so I will measure the impedance of the birch trees and pine trees accordingly and will get their Z right into the middle of the Smith chart by trimming the lower branches using the Seitenschneider. Should surely help ! Subscribe for beeing kept uodated on the results!
@@Linas_LY2H Been there! Just be careful of that pine needles, they should have parasitic resonance on higher frequencies.. you should be ok with the birch though!
Have fun!
Really enjoy your channel Linas. When camping I use an End Fed Half Wave on 80m which is also resonant on 40m and 20m. If my campsite is smaller I use a coil shortened 80m EFHW. In Canada we have millions of tall antenna supports disguised as trees! de John VA3KOT
@@Linas_LY2H Wow such a great laugh. Thanks you guys for bringing smile and even audio effects in my shack! Keep having fun! I know this is old post but I could not resist sharing my laughter. 73