Quote:
Originally Posted by G8HQP Dave
That would depend on the matching range of the matcher, and the impedance presented by the antenna. There is no fundamental problem with putting some feeder in the way.
|
Yes there is. And the longer the feeder is (in relation to wavelength) the worse the problem is. It's no fun having 200W radiated by a feeder cable mostly inside the building, even though the transmitter SWR is "good".
No, its just the feeder + aerial matched to the radio. It's terrible and can result in pickup or radiation by the feeder. You lose a lot of receive or transmit efficiency. That's why the 1970s the military had complex remote "ATU"s in a big box. The Aerial isn't matched. It just means the transmit SWR looks good or the receive signal and noise has peaked.
This is one of the biggest myths about "ATU"s (Match Boxes). Another myth is a that twin feeder and a balun at the radio + ATU works better than a coax feed. What's happening is that the feeder is the aerial!
I have deliberately used a long outdoor feeder cable to extend an aerial for 160m (1.8MHz) reception. Short the radio end (twin or coax) and the feeder is the aerial and the dipole is a capacity hat.