[Antennas] half sloper

2002年7月25日 19:27:46 -0400

Relocating the loading coil will require that the inductance be
recalculated. Inductance is based on the coil location, less for feed
point, more for mid [center] loading, most for end loading.
I can't speak to the coax discussions.
73, Deacon Dave, W1MCE
Chris Adams wrote:
>> I'm looking at building a reduced size half sloper for 160m based on
> WD8DSB's article in March 1998 QST.
> http://www.arrl.org/members-only/tis/info/pdf/9803054.pdf (if you're
> an ARRL member).
> I'm considering moving the loading coil to the low end of the sloper as
> it seems this would help get the maximum current amplitude on the
> sloping wire, thus increasing radiation.
>> Another more radical idea I'm considering is using the coax shield
> itself as the vertical portion of the sloper (no tower here). The
> process is that if the coax shield was connected to the radial ground
> plane at ground level and a choke balun was placed immediately after the
> radials on the transmitter side, currents would flow on the outside of
> the coax only on the vertical portion.
>> It seems the weakness to this thought process is:
>> The coax is still going to want to act like a transmission line so
> minimal current will flow on the outside of the coax. If this is the
> case, then the sloper would not work correctly. The solution to this is
> of course to add a seperate vertical wire but I'm hoping to avoid that.
>> Any thought from the group?
>> thanks,
>> chris, n4vi
> boulder, co
>> - - -
>> Your moderator for this list is:
> Larry Wilson KE1HZ [email protected]
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