Balun One Nine: cutting R1

[rjzastaury]

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

[Egil - LA2PJ]

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

[rjzastaury]

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

[Egil - LA2PJ]

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

Good luck!


73's
Egil - LA2PJ

[rjzastaury]

Thanks!

[Andrew (grayhat)]

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

[rjzastaury]

Thanks, Andrew!

[Andrew (grayhat)]

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

[rjzastaury]

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

[rjzastaury]

Do I scrape it here?