[Boatanchors] Window Line, thanks all
Phil
ko6bb1 at gmail.com
Mon Nov 21 13:43:40 EST 2011
Thanks all,
As this turned into a rather lengthy thread I'll say 'thank you', and
answer everyone at once.
The reason for my question was that while the 'PAR End Fedz' antenna I
replaced the window line fed 88' dipole with IS very low noise, picking
up very little of the power line RFI that made hamming miserable here,
and it has a superior signal/noise ratio, I may need to put the dipole
back up.
Because conditions were so bad I'd sold my Yaesu FT-2000 and put the
money back in the bank, installed the PAR antenna (low noise, but
receive only) and was able to enjoy SWLing again. But this past week a
ham friend of mine dropped off an 'extra' transceiver he had (a nice
Kenwood TS130 and Kenwood AT120 tuner) said it was mine to use on
"permanent loan" and I "HAD" to get it up on the air.
So I guess the dipole has to go back up, then I need to get a 4:1 balun
(the one I made is small and receive only). I want to try routing the
feed-line a little differently and see what else I can do to reduce
noise pick-up (which is miserable in this mobile home park). That's why
I was asking about the optimum twist ratio for the line, the dipole will
be supported with three push-up poles and is mounted over a sheet-metal
roof and metal awnings.
Being too long (88') for the size of the mobile home and lot, each end
has to be bent down and out some, bringing the ends closer to the metal
roof in a lopsided manner. (NOT ideal, but in the past that antenna has
proved to be the best performing HAM antenna I could put up here, I've
tried many different ones, slopers, dipoles and verticals).
You can see the dipole feedline in this picture, if you look closely you
can see the actual dipole wires and guy ropes. The Butternut HF2V for
75/40 is no longer installed as it interacted with the dipole badly and
the dipole worked better anyway.
http://ko6bb1.multiply.com/photos/album/25/New_wire_antenna_Field-Day_2009_from_Home#photo=6
--
73 de Phil, KO6BB
http://ko6bb1.multiply.com/ (OTR Blog)
http://www.qsl.net/ko6bb/ (Web Page)
RADIOS:
Grundigs: Satellit 750 (2011), S-350 (2006)& G6 (2011).
Radio Shack: DX-380 digital portable (circa 1990).
Yaesu: Two FT-8800 Mobiles, VX8R Quad-Band (circa 2010).
Zenith: Royal-7000 Transoceanic (circa 1969).
ACCESSORIES: MFJ 1040C Pre-Selector, W9GR Audio DSP.
ANTENNA: PAR 60 Foot End-Fed, up about 28 feet at Apex.
Central California
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