Gary wrote:
I've got about a 70 foot +/- run of RG-8X that I use to feed my 40
meter dipole. I also use the same feedline and dipole through an
MFJ-949E tuner to operate on 30 meters with. Out of curiosity can
someone tell me about how much a a signal loss I've got compared to
having an antenna that's actually cut for 30 meters ?

Thanks in advance.

For 30M ops I suspect that you'd be much better off if you temporarily
shorted the center conductor and the braid of the coax together and
turned the feedline + dipole into a top-loaded vertical. Build a
"shorting widget" out of an SO-239 in order to be able quick-change
bands (sort of). On 40M feed it as a dipole as usual. On 30M install
the "shorting widget" on the 8X 259 connector, feed the widget from the
"random wire" connection on the back of the 949E and tune up. Attach a
couple 25 foot radials to 949E ground post.

73 Gary K8IQ

w3rv