Well, fairly basic swr measurements. BUT, the real use for a 1 to 1 is common mode attenuation. There are several channels who did take on those measurements, and they are the most important measurement on any 1 to 1 with a flat SWR. Are all of the toroids using the same type of material ? 43 or 31 for instance ?
I have not as yet made done the throughput tests however this will most likely be governed by the type number of the toroid used. My full playlist of Bal-uns & Un-Uns is here:- ua-cam.com/play/PLWReAZ_MgKO5K8-rbsAlMTJaNFT7rh2Ma.html
Very interesting video ; i was wondering whether the coax version resistance is in the range of that of the other baluns or is there any reason according which it has such a low SWR especially above 10m, in other words is it doing its job properly ?
My best guess is that the coax version is maintaining the 50 ohm throughout the length of the wire as a constant so the only variation from that would be caused by the toroid on the frequencies that are outside its tolerance range. A pass through test would show where the actual frequency range falls off.
@@A.R.O.T.A. thanks for your answer; your results have puzzled me enough to search the web for an answer to this and actually there would be an answer: indeed while coax keeps its 50-ohm impedance it is very difficult to get 50 ohms from a bifilar version, which would explain why on your bifilar you did not have the coax wound ferrite low SWR across the HF range. All in all, it seems that the coax version has the advantage provided one uses teflon coax and the coax diameter (thus ferrite core diameter) which is best suited for the intended power to use. Not to forget that mix 31 is better suited for lower bands and 43 for higher bands. If I am not mistaken (to double-check), mix 61 would be usable above 30 mhz. I also have found that the number of coax windings and the number of cores is linked and dependant of the range of frequencies to choke (here the goal is to have the highest choking impedance possible, ie. ideally around 5000 ohms).
Thanks . Very helpful !
Well, fairly basic swr measurements. BUT, the real use for a 1 to 1 is common mode attenuation. There are several channels who did take on those measurements, and they are the most important measurement on any 1 to 1 with a flat SWR. Are all of the toroids using the same type of material ? 43 or 31 for instance ?
Useful information and interesting content. Thanks for making the video. I need to look now to see if you made the follow-up. Best 73.
I have not as yet made done the throughput tests however this will most likely be governed by the type number of the toroid used.
My full playlist of Bal-uns & Un-Uns is here:- ua-cam.com/play/PLWReAZ_MgKO5K8-rbsAlMTJaNFT7rh2Ma.html
@@A.R.O.T.A. Thanks, I'll work my way through the playlist as I'm a about to build a 40M loft dipole.
Very interesting video ; i was wondering whether the coax version resistance is in the range of that of the other baluns or is there any reason according which it has such a low SWR especially above 10m, in other words is it doing its job properly ?
My best guess is that the coax version is maintaining the 50 ohm throughout the length of the wire as a constant so the only variation from that would be caused by the toroid on the frequencies that are outside its tolerance range. A pass through test would show where the actual frequency range falls off.
@@A.R.O.T.A. thanks for your answer; your results have puzzled me enough to search the web for an answer to this and actually there would be an answer: indeed while coax keeps its 50-ohm impedance it is very difficult to get 50 ohms from a bifilar version, which would explain why on your bifilar you did not have the coax wound ferrite low SWR across the HF range. All in all, it seems that the coax version has the advantage provided one uses teflon coax and the coax diameter (thus ferrite core diameter) which is best suited for the intended power to use. Not to forget that mix 31 is better suited for lower bands and 43 for higher bands. If I am not mistaken (to double-check), mix 61 would be usable above 30 mhz.
I also have found that the number of coax windings and the number of cores is linked and dependant of the range of frequencies to choke (here the goal is to have the highest choking impedance possible, ie. ideally around 5000 ohms).
Less windings on the balun with magnet wire give an improvement on the higher bands. Too much inductance for 10M band.
Interesting. I'll have to do some tests.