Why are you building a new dipole with a balun in it, before you even know
if you need a balun? Try building the dipole with a "normal" center support
(Budwig, etc.) and put it on the air. If you see no problems, you're done.
Save the balun until you know it can be inserted to alleviate a problem,
rather than taking thechance on the balun BEING the problem...

73,
Mike KI6PR
El Rancho R.F., CA

"Frank MacKenzie-Lamb" wrote Hi folks,

I've moved to a country area in central MA and will be putting up a 40m
diople. Considering using a balun with my AT-250 tuner with mt TS-430.

If the tuner can tune in 20 and 10M, will damage be done to the 1:1 balun?

Thanks
NG1I