Balun One Nine: cutting R1
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Balun One Nine: cutting R1
I'm finally getting around to building a SULA. I have my Balun One Nine in hand, but I'm not clear on what cutting the R1 jumper/resistor entails. Can someone please tell me how exactly to do it? Pardon my ignorance...
Thanks,
Ron
Thanks,
Ron
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Re: Balun One Nine: cutting R1
It is done to obtain galvanic isolation between the antenna and radio.
See here: https://swling.com/blog/2019/10/the-noo ... lun-19-v2/
73's
Egil - LA2PJ
See here: https://swling.com/blog/2019/10/the-noo ... lun-19-v2/
73's
Egil - LA2PJ
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Re: Balun One Nine: cutting R1
Thank you, Egil. I guess I should clarify my question: How do I physically cut the resistor? Score across it with a knife?
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Re: Balun One Nine: cutting R1
Just scrape it off whith a knife... Carefully!
Good luck!
73's
Egil - LA2PJ
Good luck!
73's
Egil - LA2PJ
- Andrew (grayhat)
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Re: Balun One Nine: cutting R1
see hererjzastaury wrote: ↑Mon Sep 04, 2023 4:24 pm Thank you, Egil. I guess I should clarify my question: How do I physically cut the resistor? Score across it with a knife?
![Image](https://swling.com/blog/wp-content/uploads/2021/08/balun_back.jpeg)
you just use a cutting blade to cut the circuit trace, then use a multimeter to check if the two sides are disconnected; to rejoin the connection, use a soldering iron and put a drop of tin to reconnect the sides
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Re: Balun One Nine: cutting R1
Thanks, Andrew!
- Andrew (grayhat)
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Re: Balun One Nine: cutting R1
notice that the V1 has the central tap, while the V2 doesn't so with the V2 there's nothing to cut
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Re: Balun One Nine: cutting R1
It's the V2 that I have. How is it done for the V2?
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Re: Balun One Nine: cutting R1
Do I scrape it here?
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