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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

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

Thank you, Egil. I guess I should clarify my question: How do I physically cut the resistor? Score across it with a knife?

Just scrape it off whith a knife... Carefully!

Good luck!


73's
Egil - LA2PJ

Thanks!

rjzastaury 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?

see here



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

Thanks, Andrew!

notice that the V1 has the central tap, while the V2 doesn't so with the V2 there's nothing to cut

It's the V2 that I have. How is it done for the V2?

Do I scrape it here?