I need to document this, but here's a drawing I worked out.
http://www.part15.us/content/am-antenna-idea-center-load-shunt-fed-tuneable-dipole
I'm curious if this looks workable.
I had a similar idea but rather than shunt feed I was going to link feed.
Can you describe link fed? I'm guessing impedance tuning circuitry. Do these tend to be lossy?
Would it be "functionally compliant?"
Intended as compliant, yes. Will some shoot it down, I have no way of knowing.
3 meters length, no transmission line, no accidental radiators ( mast, coax shield), it looks good to me.
From reading, the optimization tuning and not relying on earth might make it more efficient. Mounting up high, which might be compliant, might help signal clear obstructions.
Interpretation might see the center load and shunt mechanism as part of electrical length. In this light, it wouldn't be compliant, but I sort of doubt that would happen. At least hope it wouldn't if I build and use one.
Honestly, I'm not sure if it would tune. It's just an idea on optimization.
Link fed meaning rather than a direct electrical connection to the radiator or coil, the appropriate number of turns would be wound around the loading coil to form a transformer coupling commonly referred to as a link couple.
The Hams used to do that with the balanced antenna tuner/coupler.
Like a combo loading coil and balun? I think that would make a dipole very happy. Transmitter too.
MRAM wrote: The Hams used to do that with the balanced antenna tuner/coupler.
And use open feeder ............... Next: Is the use of open feeder part 15 compliant??
Probably only if it is operated per Part 15.209 whereby you can use whatever combination of equipment you desire so long as the signal does not exceed the field strength limit.