Thanks Morten. I can't recall seeing that test method before, but it seems to be working well. I need a budget weatherproof end fed just like that for my current needs. I'm looking forward to part 3.👍
Curious that the resistive contribution (Z) to the impedance (|Z|) increased on 40m. As to testing how "good" rhe unun is, how about running WSPR for some minutes with this and then repeating wirh a known good 49:1 unun?
This is by no means a scientific test, it’s just a way to see if the unun is slightly in the ballpark of working. And when antenna tuning weather comes along it will be properly tested with a wire.
It seems your 49:1 Unun also has lost its three cable ties holding the toroid to the PCB ;-) My Banggood Unun arrived this week and they fell off immediately after opening the case. I will give it try hopefully next weekend ;-) 73 Arnd DJ9PZ AB2QP
Best is to use non-inductive resistors. Obviously not wire wound, but badly made film resistors can be inductive. GOOD film resistors are made to be non-inductive.
Thankyou Morten, you have triggered a thought in my head. Operation Find 49:1 is in progress..
Happy to help!
Thanks Morten. I can't recall seeing that test method before, but it seems to be working well. I need a budget weatherproof end fed just like that for my current needs. I'm looking forward to part 3.👍
I was by no means the first hamtuber to show this, both Ham Radio Dude and The Smoking Ape has done it before me.
Thanks for that. Maybe I need to go and have a look. Maybe I wasn't concentrating enough.😊🤷🏻♂️
Nice test!
Thanks Mike
Nice test Morton on a cheap Balun! 73
Thanks Jeff!
Curious that the resistive contribution (Z) to the impedance (|Z|) increased on 40m.
As to testing how "good" rhe unun is, how about running WSPR for some minutes with this and then repeating wirh a known good 49:1 unun?
This is by no means a scientific test, it’s just a way to see if the unun is slightly in the ballpark of working. And when antenna tuning weather comes along it will be properly tested with a wire.
It seems your 49:1 Unun also has lost its three cable ties holding the toroid to the PCB ;-) My Banggood Unun arrived this week and they fell off immediately after opening the case.
I will give it try hopefully next weekend ;-)
73 Arnd DJ9PZ AB2QP
You are correct. The zip ties came pre cut inside the box, but everything sits well without them, so I dropped adding new ones.
Best is to use non-inductive resistors. Obviously not wire wound, but badly made film resistors can be inductive. GOOD film resistors are made to be non-inductive.
You are absolutely correct, but my point was to show how you could do a simple test with things you have around the shack.