Re: LOOP ANTENNA
- --- In firstname.lastname@example.org, "rn_kastury" <rkastury@...> wrote:
>Hello. I did abt 25 years ago buy an active symetrical DATONG antenna
> I live in Mumbai,(formarly BOMBAY) India, a concrete jungle. I am on
> the 2nd floor of a seven story apartment block, surrounded by
> similar blocks 40 ft apart. My owner does not allow me to put up any
> antenna - even a piece of wire, on the terrace of the building. My
> windows are caged in steel grill work - and may be sort of farady
> After going through many discussions on this group, I tried many SW
> antennas for my Sony7600. I have now made a antenna using the normal
> Cable TV shielded antenna wire, 10 ft of this wire was stripped off
> the shielding leaving another 10ft shelded. This was made into a
> loop of about 1 1/2 ft dia giving 4 turns - 2 unshielded, 2
> shielded - making a sort of dipole loop !
> I have put this inside my room, near the window, and am getting a
> fairly good SW reception. But is not as good as outdoors with the
> Sony builtin whip. I wonder whether the same wire without looping,
> as a straighrt dipole, dropped out of my window would have given me
> a better SW reception ! I hope my landlord will allow this !
> I am getting many MW stations - most of them weak signals, early
> morning and at night, - strength 2 to 3 / 10 - from All India
> Radio which has more than 60 transmitters all over India - I want to
> improve the signal strength of the MW signal using an indoor
> antenna. ( of course I have tried all various positions and
> directions in the room to get the best signals)
> Is there any way to boost the MW signals?
amplifier intended for using a whip on each side abt 1,5 m.
It was an active antenna for longwave to 30mhz.
It looked as a kind of simple fm dipole.
I took away the whips, and instead made about 25-30 turns of a single
cable around a cartoonbox about 1 m in diameter..
I coupled the start and the end of this antenna to the 2 different edges
of the amplifier.
Out of the amplifier there was a coax antenna cable for a couple of meters.
This worked nicely on all bands. and the magnetic loop of course was directive.
I just turned the cartoon under my working desk.
No tuning necessary.
I also tried a passive Yaesu rx tuner directly to the cable around the cartoon.
It also worked nice. But of course it was necessary with exact tuning.
Later I have tried to make a lot of turns around a sony icf7600 and coupled
this to a flatcable standard 300ohm tvcable.
This tvflatcable was put around the window inside coupled to a similar flat cable
some meter long directly to the turns around the icf7600.
The flatcable around the window was coupled in a way that this became a 2 turn
single wire loop.
This system boosted inductivly lw and mw on the sony radio. I did not use any
tuner here. Of course it may be could have helped.
Good luck. from la7um Finn.