DL7APV 128yagi on 432, why? Pro&contra DL7APV 2018 Egmond EME - - PowerPoint PPT Presentation

▶
dl7apv 128yagi on 432 why pro contra
SMART_READER_LITE
LIVE PREVIEW

DL7APV 128yagi on 432, why? Pro&contra DL7APV 2018 Egmond EME - - PowerPoint PPT Presentation

Oct 26, 2022 317 likes •782 views

DL7APV 128yagi on 432, why? Pro&contra DL7APV 2018 Egmond EME conference Pro yagi Pro dish Low windload Many bands possible No permission needed Easy polarity rotation Can grow slowly Low losses on feedlines Low

slide-1
SLIDE 1

128yagi on 432, why? DL7APV

slide-2
SLIDE 2

Pro&contra

DL7APV 2018 Egmond EME conference

Pro yagi

  • Low windload
  • No permission needed
  • Can grow slowly
  • Low loss feed lines possible
  • Nobody tried such an array

Pro dish

  • Many bands possible
  • Easy polarity rotation
  • Low losses on feedlines
slide-3
SLIDE 3

2008 a „happy accident“

DL7APV 2018 Egmond EME conference

  • All started with a huge rotating assembly with ball bearing

from ebay!

  • In his former

life it was part of a T174 GDR backhoe

  • The new 16y

was just ready The rotating assembly with 1.6m diameter & about 500kg weight with lots of rust

slide-4
SLIDE 4

2009 Foundation

DL7APV 2018 Egmond EME conference

  • After the location was fixed a BIG hole was needed
  • filled with 10t of concrete
  • Tnx to my neighbors with the heavy machinery,

so it took only a few hours

slide-5
SLIDE 5

2010 Puzzle

DL7APV 2018 Egmond EME conference

  • When the

concrete cured, the gear was disassembled and refurbished.

  • A real puzzle

for men

slide-6
SLIDE 6

2010 the horizontal boom

DL7APV 2018 Egmond EME conference

  • The hor.

Boom was delivered in 3 parts of 6m.

  • 75x70cm with

60mm welded steel tubes

  • From a local

flat conveyor manufacturer

slide-7
SLIDE 7

2011 Basic setup

DL7APV 2018 Egmond EME conference

  • The rotating assembly was placed in position by a crane (agn

tnx to my neighbor) and adjusted to only 0.2° out of balance

  • After sandblasting and new grease even Astrid could

turn it!

slide-8
SLIDE 8

2011 Basic construction

DL7APV 2018 Egmond EME conference

  • To be open

to different solutions the height

  • f the hor.

Boom was planned with 5m.

  • The gears

are from a fertilizer spreader

slide-9
SLIDE 9

2011 Basic construction

DL7APV 2018 Egmond EME conference

  • One hor.

Boom is mounted

  • Some steel

tubes are

  • nly for

transport

  • Elevation

chain is also mounted

slide-10
SLIDE 10

2011 Basic construction

DL7APV 2018 Egmond EME conference

  • The

crane again did a good job.

slide-11
SLIDE 11

2011 Basic construction

DL7APV 2018 Egmond EME conference

  • A lot of steel

tubes had to be welded

slide-12
SLIDE 12

2012 horizontal rotor

DL7APV 2018 Egmond EME conference

  • Background original gear, in front worm gear + motor
  • Encoder in shielded metal and waterproofed box
slide-13
SLIDE 13

2012 The vertical rotor

DL7APV 2018 Egmond EME conference

  • The main gear wheel was made from stainless steel in an

apprentice workshop for 1kg of coffee. The 2nd gear wheel is held in a block which takes all the axial forces to relieve the next worm gear. The motor is from a cable winch for a jeep, 12V.

slide-14
SLIDE 14

Basic construction

DL7APV 2018 Egmond EME conference

  • Very

important detail.

  • Enough teeth

must transmit the force.

slide-15
SLIDE 15

2012 horizontal boom

DL7APV 2018 Egmond EME conference

  • The crane

was in action again

slide-16
SLIDE 16

Questions ?

DL7APV 2018 Egmond EME conference

slide-17
SLIDE 17

Till 2015 only FM Antennas

DL7APV 2018 Egmond EME conference

  • 8 FM

antennas were first user.

  • The old 16y

system was hit again by a storm.

slide-18
SLIDE 18

2015 Which antenna should be used

DL7APV 2018 Egmond EME conference

  • The dimensions of the main frame were not variable
  • Max. 10m height
  • Width 18m
  • Many simulations with different boom length and number
  • f yagis showed that pre mast mounting with 128 yagi

was the optimum.

  • Longer yagi showed degration of pattern by support

structure

  • Even longer yagis with same stacking had lower G/T
slide-19
SLIDE 19

2015 Which antenna should be used

DL7APV 2018 Egmond EME conference

  • Next step to choose the design
  • Many different good designs are available
  • DJ9BV, DK7ZB, G0KSC, YU7EF, DG7YBN and more
  • The decision was easy, as I found only one design which

could combine all advantages

  • Low temperature / low internal losses
  • 200 Ohm at feedpoint
  • Excellent pattern
  • Uncritical at rain
  • Good boom length to mimimize waste material
  • Easy to built
slide-20
SLIDE 20

2015 Which antenna should be used

DL7APV 2018 Egmond EME conference

  • The DG7YBN 11el. Wide was the winner
  • SWR dry
  • SWR wet ybn
  • All other were

>>2

slide-21
SLIDE 21

2016 Test setup

DL7APV 2018 Egmond EME conference

  • 4x11el. Wide test setup to verify gain & pattern
  • Test of the open feed lines
  • Hint : use for test a wide band transformer
slide-22
SLIDE 22

2016 Which antenna should be used

DL7APV 2018 Egmond EME conference

  • Alu feed lines at stacking of 1,09 x 1,2m were tested
  • It is not easy to bent 6x1mm Alu
  • So copper feed lines were used for the first 4bay
  • 4mm enameled copper wire was much easier to

bring into correct form

  • Losses are nearly same as 6mm alu
  • Not easy to fix the joints.
  • Soldering joints need mechanical support
  • Need an „adapter“ Cu – Al wheather proofed
  • Need more PTFE spacers
  • Has to be stretch when comes from spool
slide-23
SLIDE 23

2016 copper wire stretcher

DL7APV 2018 Egmond EME conference

  • Cu has to be stretched when comes from spool !
  • Two towers and two man can do!
slide-24
SLIDE 24

2016 tubes

DL7APV 2018 Egmond EME conference

  • Looks more like a 20m beam
  • 24 tubes 6m extended to 8m
slide-25
SLIDE 25

2017 Antenna production

DL7APV 2018 Egmond EME conference

  • Marking & drilling 1792 holes into the booms
slide-26
SLIDE 26

2017 Antenna production

DL7APV 2018 Egmond EME conference

  • 1280 elements were cutted and filed into length
slide-27
SLIDE 27

2017 Antenna production

DL7APV 2018 Egmond EME conference

  • 128 yagi after inserting and adjusting 1280

elements with 2560 platic rivets

slide-28
SLIDE 28

2017 feed line production

DL7APV 2018 Egmond EME conference

  • Puzzle with copper wires
slide-29
SLIDE 29

2017 dipole production

DL7APV 2018 Egmond EME conference

  • The dipole bending machine
slide-30
SLIDE 30

2017 yagi mount

DL7APV 2018 Egmond EME conference

  • The first yagi mounted, only 127 to go
slide-31
SLIDE 31

2017 dipole production

DL7APV 2018 Egmond EME conference

  • Details of the holder of the dipole
  • Details of solder joint
slide-32
SLIDE 32

2018 feed line production

DL7APV 2018 Egmond EME conference

  • Al feed lines
slide-33
SLIDE 33

2018 transformation lines

DL7APV 2018 Egmond EME conference

  • N times transformation 4y to one feed point
  • till 2 lines are left and then a balun 100:50 Ohms
slide-34
SLIDE 34
  • pen feed line support

DL7APV 2018 Egmond EME conference

slide-35
SLIDE 35

Preamp Box

DL7APV 2018 Egmond EME conference

  • The HF4000-2Z and DJ3FI preamp + hb 2nd stage
  • NF=0.35dB G=42dB
slide-36
SLIDE 36

2018 April ready for test

DL7APV 2018 Egmond EME conference

  • The first SWR test I made in April on my birthday
  • SWR 1:1.3 without optimization.
  • Hurray Open feed lines are uncritical!
slide-37
SLIDE 37

SWR

DL7APV 2018 Egmond EME conference

  • SWR after optimization with some PTFE tubes
slide-38
SLIDE 38

Don´t fall asleep

DL7APV 2018 Egmond EME conference

  • Only a few more pages to go!!!
slide-39
SLIDE 39

Theory

DL7APV 2018 Egmond EME conference

  • The Theory of VK3UM software
slide-40
SLIDE 40

Pattern

DL7APV 2018 Egmond EME conference

  • Sun noise was >20dB on first test, after a few
  • ptimizations I got stable 21.8 +/-0,5 till today
  • Antenna pattern H and V at sun noise
slide-41
SLIDE 41

Used material

  • Concret

10tons

  • Big ball bearing

500Kg

  • 18m Horizontal boom

750kg

  • H Steel 120x120x12

x21.4m 440Kg

  • Steel square tubes 80x80x4 x31.3m

292kg

  • Steel square tubes 100x100x6 x25.6m

427kg

  • Alu 24 tubes 6m 60x5mm

348,5Kg

  • Alu 48 tubes 1,5m 48x3 (extension)

83Kg

  • Alu 128 booms a 3m 20x20x2

150,4Kg

  • Alu square tubes 20x20x1 18m

10Kg

  • Alu square tubes 18x18x1 124m

25Kg

  • Alu round pipe 6x1

223.6m 10kg

  • Alu 4mm rods
  • abt. 384m

13,5Kg

  • Copper dipoles 6x1mm 128x0.7m

18 Kg

  • CuL wire 4mm abt. 224m

28Kg = 3.1 tons plus concrete

  • And much much more…..
slide-42
SLIDE 42

Results

DL7APV 2018 Egmond EME conference

  • Pointing accuracy El. <0.1° H <0.35°
  • With US digital encoder and F1EHN tracking
  • Sun 21.8dB
  • Echoes
  • JT 100mW
  • CW abt. 200mW
  • Sagittarius 7.3dB
  • M17 6.1dB
  • Cygnus 5.4dB
  • Cassiopeia 5.3dB
slide-43
SLIDE 43

Results

DL7APV 2018 Egmond EME conference

  • First Pulsar detected in

July

  • B0329+54 was seen with
  • nly 200sec recording

time !

  • And the 8x9el. 3m FM DX

are still on top and make much fun!!

slide-44
SLIDE 44

Lowest ERP

DL7APV 2018 Egmond EME conference

  • M0ABA 2el. & 60W (at -25)
slide-45
SLIDE 45

Thank You

DL7APV 2018 Egmond EME conference

  • to my wife Astrid, and all who helped, special to Hartmut DG7YBN,

DL7SI, DL7ON, DL7ZN, DL7AIG, Hubert DJ3FI and my nice neighbors

slide-46
SLIDE 46

For G3LTF dual use antenna!