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

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 loss feed lines possible • Nobody tried such an array

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

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

2010 Puzzle DL7APV 2018 Egmond EME conference • When the concrete cured, the gear was disassembled and refurbished. • A real puzzle for men

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

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!

2011 Basic construction DL7APV 2018 Egmond EME conference • To be open to different solutions the height of the hor. Boom was planned with 5m. • The gears are from a fertilizer spreader

2011 Basic construction DL7APV 2018 Egmond EME conference • One hor. Boom is mounted • Some steel tubes are only for transport • Elevation chain is also mounted

2011 Basic construction DL7APV 2018 Egmond EME conference • The crane again did a good job.

2011 Basic construction DL7APV 2018 Egmond EME conference • A lot of steel tubes had to be welded

2012 horizontal rotor DL7APV 2018 Egmond EME conference • Background original gear, in front worm gear + motor • Encoder in shielded metal and waterproofed box

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.

Basic construction DL7APV 2018 Egmond EME conference • Very important detail. • Enough teeth must transmit the force.

2012 horizontal boom DL7APV 2018 Egmond EME conference • The crane was in action again

Questions ? DL7APV 2018 Egmond EME conference

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.

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 of 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

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

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

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

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

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!

2016 tubes DL7APV 2018 Egmond EME conference • Looks more like a 20m beam • 24 tubes 6m extended to 8m

2017 Antenna production DL7APV 2018 Egmond EME conference • Marking & drilling 1792 holes into the booms

2017 Antenna production DL7APV 2018 Egmond EME conference • 1280 elements were cutted and filed into length

2017 Antenna production DL7APV 2018 Egmond EME conference • 128 yagi after inserting and adjusting 1280 elements with 2560 platic rivets

2017 feed line production DL7APV 2018 Egmond EME conference • Puzzle with copper wires

2017 dipole production DL7APV 2018 Egmond EME conference • The dipole bending machine

2017 yagi mount DL7APV 2018 Egmond EME conference • The first yagi mounted, only 127 to go

2017 dipole production DL7APV 2018 Egmond EME conference • Details of the holder of the dipole • Details of solder joint

2018 feed line production DL7APV 2018 Egmond EME conference • Al feed lines

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

open feed line support DL7APV 2018 Egmond EME conference

Preamp Box DL7APV 2018 Egmond EME conference • The HF4000-2Z and DJ3FI preamp + hb 2nd stage • NF=0.35dB G=42dB

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!

SWR DL7APV 2018 Egmond EME conference • SWR after optimization with some PTFE tubes

Don ´ t fall asleep DL7APV 2018 Egmond EME conference • Only a few more pages to go!!!

Theory DL7APV 2018 Egmond EME conference • The Theory of VK3UM software

Pattern DL7APV 2018 Egmond EME conference • Sun noise was >20dB on first test, after a few optimizations I got stable 21.8 +/-0,5 till today • Antenna pattern H and V at sun noise

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 …..

Results DL7APV 2018 Egmond EME conference • Sun 21.8dB • Echoes • JT 100mW • CW abt. 200mW • Sagittarius 7.3dB • M17 6.1dB • Cygnus 5.4dB • Cassiopeia 5.3dB • Pointing accuracy El. <0.1 ° H <0.35 ° • With US digital encoder and F1EHN tracking

Results DL7APV 2018 Egmond EME conference • First Pulsar detected in July • B0329+54 was seen with only 200sec recording time ! • And the 8x9el. 3m FM DX are still on top and make much fun!!

Lowest ERP DL7APV 2018 Egmond EME conference • M0ABA 2el. & 60W (at -25)

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

For G3LTF dual use antenna!