Is the 1/4wave bazooka balun more efficient at 70cms than stacked ferrites? I was thinking of copper tube sleeving going over the coax and then soldered at a 1/4 wave from the feed point? Thanks for the video Justin Cheers Mark GØNMY
Thank you for another excellent tutorial Justin. I see many examples of people just coiling the coax, just under the antenna feed point, is that as effective as the ferrite? Can you model that?
Excellent video! What ferrite choke balun would you recommend for a 6 element LFA yagi at 50-54 MHz? What is better, exiting the balun toward the back over the reflector or hang the antenna upside down and exit it at 90 degrees to the boom like the video shows?
i have a 2 el yagi for 14 mhz . its in a great location more the 2 wavelengths away from anything and 18m above downward sloping ground with nothing to the horizon in my favored direction but its noisy . Its direct fed and insulated however it is dc grounded as i match it with a hairpin . I`m not using any choke atm but seems it could help . Do you know the math for a coaxial would choke ? How important is the diameter of the choke /balun and number of turns ? Thanks
Great demonstration Justin. Thanks for taking the time and effort. In that 70cm example, would the coax continue to fall way from the boom to eventually meet the mast at a much lower point, or would it curve over and then travel along the boom and down the stub-mast at the bracket? Thanks.
Congrats. Very visual indeed, explanation of the balun question. Cheers. 73, Maximo
Many thanks!
@@hamradioguy-g0ksc96 would be interesting to compare different balun, for example; sleeve, 1/4 bazooka, 3/4 coax, etc.
Is the 1/4wave bazooka balun more efficient at 70cms than stacked ferrites?
I was thinking of copper tube sleeving going over the coax and then soldered at a 1/4 wave from the feed point?
Thanks for the video Justin
Cheers Mark GØNMY
Well done Justin. Excellent video explanation! 73 de Z33T
Thank you
Thank you for another excellent tutorial Justin. I see many examples of people just coiling the coax, just under the antenna feed point, is that as effective as the ferrite? Can you model that?
Glad it was helpful! have the ferrite balun modelled video added now too
Excellent video! What ferrite choke balun would you recommend for a 6 element LFA yagi at 50-54 MHz? What is better, exiting the balun toward the back over the reflector or hang the antenna upside down and exit it at 90 degrees to the boom like the video shows?
Ideally, hang antenna 'upside down' and exit coax at near 90 degrees. It does not matter of you go forward or backwards
i have a 2 el yagi for 14 mhz . its in a great location more the 2 wavelengths away from anything and 18m above downward sloping ground with nothing to the horizon in my favored direction but its noisy . Its direct fed and insulated however it is dc grounded as i match it with a hairpin . I`m not using any choke atm but seems it could help . Do you know the math for a coaxial would choke ? How important is the diameter of the choke /balun and number of turns ? Thanks
details in the latest video on the 'without' a balun. search on Google, there are lot of site for doing this.
Which type of Ferroxcube do you use? 4C65?
This is an acceptable choice
Great demonstration Justin. Thanks for taking the time and effort. In that 70cm example, would the coax continue to fall way from the boom to eventually meet the mast at a much lower point, or would it curve over and then travel along the boom and down the stub-mast at the bracket? Thanks.
You are welcome. Coax/balun should always exit the boom at around 90 degrees although it is fine to then loop the coax back to and secure to the boom.
Justin, not sure if you noticed that, but audio and video are not sync.
it happens sometimes
Nice video! 73, DL8LAQ