On (20 Jul 97) Henry Edginton wrote to All...
 HE> Hello All!                 144 - 148 mhz
Hello! Got a couple of questions on the one made from copper. When you
say "center to center" (the 48" dimension) do you mean from the very tip
of the top or bottom "ends" of the vertical parts to the centerline of
the horizontal run (where the "elbows" are)? I assume the single cap in
the parts list is for the top portion only? How critical is the 48"
dimension, i.e. is the vertical "pipe" cut to 48 inches and then the cap
put only on the top? Or should the additional lenght added by the cap be
the taken in to account on the top vertical part?
And do the horizontal portions have any specific lenght? Or are they a
total of 18" plus the width (1/2" each) of the three(?) vertical
portions? It looks like the 14 inch dimension is to the shorting bar on
the top part of your drawing, (measured "inside" from the edges of each
vertical component) but on the bottom portion it looks like the 14 inch
dimension *may* be to one half of the feed line connection point. Where
do you connect the other half of the feedline? Or is one side of the
feed line connected to the top portion and the other to the bottom
portion? If that is correct, how far is it from the centerline of the
vertical portions to the feedpoints? Your "general" paragraph (for both
versions?) about "feed" and "type" of coax saying "feed 4 to 6 inches"
from the vertical part dosn't jibe for the twinlead version. If 4 to 6
inches is correct, does that mean you have to experiment and check
SWR's as you go? Or does it mean "anywhere" within the 4 to 6 inches?
 HE>                           DOUBLE FOLDED ZEPP   5/8 wave omni. 6dbd.
 HE>          Ä  º            ---------------------
 HE>             º
 HE>      48"    º
 HE>      to     º                                       Pipe hardware
 HE>    center   º                                      ---------------
 HE>             º outside pipe edges                   12' copper pipe .5"
 HE>             º 14"  º4"º                            4 T's
 HE>             º   ³                                  2 elbows
 HE>     3"   Ä  ÈÍÍÍÍÍÍËÍ͹Bolt to tower or mast       1 cap
 HE>          Ä  ÉÍÍÍÍÍÍÊÍ͹
 HE>             º   ³  ³
 HE>     48"     º   f  ÀShorting Bar
 HE>     to      º   e
 HE>   center    º   d
 HE>             º   3
 HE>             º   0
 HE>             º   0
 HE>          Ä  º
And I assume your "fed300" note is the feed point impedence of the
copper one as well as the "twinlead" one? If so did you put your 4:1
balum between the feedpoints and then run coax over from the tower to a
coax connection on the balum on your copper version? Or do *you* have
the twinlead version, and feed it with twinlead and not use use a balum
at all, at least near the feedpoint?
And I was unclear about the balum. You said you had "two of these up".
Which? The copper version or the 300 twinlead version? If you use a
balum on the copper one it (the balum) would also have to be rated at
the maximum power level used, would it not?
Please respond to my specific questions here (Fido), if you would.
My Email address is: wade@gratisnet.com *or* ray.wade@sbaonline.gov
so if you could also send the .PCX file one of these, it might answer
any additional questions I may have later. Thanks in advance! And thanks
for the post!
... How come pizza gets to your house faster than the police?
--- PPoint 2.00
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