[Antennas] Need suggestions on insulated tower adj and mods.

Tue, 09 Mar 2004 20:01:14 -0500

Hi all,

Have put up another tower next to the garage (wood) and insulated the base 
and the support
to the garage. Tower is Universal 40ft alum. and has 8ft alum mast w/6mtr 
and 2mtr beams
on it.  Have abt 12 misc length radials in ground around it in 3directions.

Measured the ant at different freq as below measured at the base with an 
Autek VA-1:

   MHz         SWR         Rs        Xs
3.218         2.0:1       65       -35
3.600         1.1:1       50         4
3.930         2.0:1       52        36

9.250         2.0:1       68       -37
9.440         1.4:1       70       -10
9.770         2.0:1       96        10

1.800         7.5:1       34        97
1.850         8.1:1       38       108
1.900         8.2:1       45       121
1.950         8.1:1       56       134
2.000         7.0:1       78       143

The 9meg freq listing is just the next lowest swr point up from 3.5 reading.
I have and am starting on the EZNEC program but just starting to learn.
Will have feed thru garage wall to tuner on other side.  Then coax to house.
Questions are:

1. What do the reading tell me about the ant possibilities?  Want to 
consider 160, 80, &40.

2. From some of my experiences seems like on 80 need more/longer radials.

3. For 160 assume (I know bad thing to do) either loading coil/tuner or can 
string
    for inverted L.

4. If inverted L, how long min.?  and any benefit to looooong wire as have 
plenty of
    room here for wire.  Abt 38 acres.

5. Have also main tower abt 100 ft away from this tower and is 60ft with 
WARC tribander and
    std 20, 15, & 10 mtr tribander on it.

6. Have to stay at least 10ft off ground level with wires in horizontal 
plane because this
    is in our apple orchard and tractor and sprayers have to travel thru rows.

7. Know what you are thinking and havn't got there yet.  Put Beverages down 
the tops of the
    apple trees.  That is one of the next steps and questions later on that.

8. On 40 assume just use tuner to where required.

9. Mainly a DXer but starting to do some contesting.  Don't worry won't be 
any threat!!  HI..

10. Open to comments, answers, and/or suggestions.

Tnx guys for all the inputs and help on this reflector.  I have learned a lot.
I/we appreciate it.

73    Phil   W9IXX  (now in rural NC with room and less noise then in 
Chicago industrial
                       park.)

-----------------------------------------------
Philip Florig           e-mail:[email protected]
115 Horne Rd.               (or):[email protected]
Columbus, NC. 28722         amateur radio:W9IXX
USA               also:J3X-T30,31,32,33P-VP2MPF 

                      team member:AH1A-J3A-VP2MX
                                     MARS:AAR4XX
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