Skip to main content

STEPPIR is up

the beam  tilt up leveled exact with the rotor pipe makes it a one man job. 


Some issues came up during assembling.

The rotor pipe is limited to 50mm by the U-bolts while even a light Kenpro 400  accepts 65mm.
Why using  outlet muffler type "no grip"  U-bolts   instead of threaded  U-bolts
Threaded U-bolts have much more grip and do not need to be bolted extreme to prevent the antenna twisting around destroying the cables.
I made my own stainless M8 threaded U-bolts again..
Also Fritzel beams FB33 use this type of non threaded U-clamps they hold only  when the tube diameter fits precise the clamp saddle and then bolt it very firmly with the risk of lacing up the beam.
The first storm here  already did break the beam through the clamps.
But must say I am using temporary a  40mm rotor pipe not the 50mm maximum size. That makes it a lot weaker connection.  Since 50 to 40 mm diameter means 20% more force on the clamps plus that they do do not fit correct.


A weatherproof coax connection to the EHU SO239 is not provided.
A fixed flexible cable outlet with a SO239 seems a better solution to me.

 
You see my point..

The beam seems to work very well  after having possible bad terminal connection to the reflector.
Even 6m did receive  but about 10db weaker signal compared to the 7ele  at 22m and 30m H2000 not bad at all.
Compared to my trap dipole at 22m,  28MHz is clearly better   20 and 15 too and having lower noise level.
F-B  is very good now   at least 3 S units at 20m  I could reverse the beam to east for TA  close to a strong W con-tester  and that really made the difference between bad and clear copy.
Need more time to compare to say more.

Comments

PE4BAS, Bas said…
Mooie foto's Jaap, de mast lijkt helemaal niet zo hoog als de antenne omhoog staat. Inderdaad is een stukje coax met een connector dan wel een betere optie. Maar met een beetje zelf vulcaniserende tape kom je ook een heel eind. Antenne werkt goed neem ik aan? Nu nog condities. 73, Bas

Archive

Show more

Popular posts from this blog

2011-01-22 DIAMOND 2m 70cm 1m30 Colinear inside

Having relative poor signals on the local 70cm / 2m channels using this X50 Diamond collinear 70/2  1m antenna at a height of 25m. I needed to investigate what could be wrong. Measuring the cable only 3W is left for the antenna of the 10W 435MHz output from a IC451E The cable is 30m type H100 Z50 10mm outside diameter it is semi air-spaced but has an impossible 4mm² solid CU inner conductor not much air left. I preferred the H43 Z75 cable having lower loss and mechanical better ratio in conductor size. My antenna uses SO239 connector UHF type semi air spaced isolator.  3W should be enough for a comfortable noise free FM signal. But only 27km away at PA0A the signal is weak too weak something must be wrong? I made a simple reference dipole of 2x17cm CU wire. With this dipole the signals where totally worse. So the Diamond does work? I got curious to look inside. Maybe moisture penetration degraded the antenna. This  antenna is rainwater close in its normal vertical mounting posit

SPF5189z Low noise preamp 23cm

 14-4-2018 updated Above the low noise  preamp 50 - 4GHz    ebay  6€ Tested  2 small porto antennas 1 Baofeng UV antenna left   2nd best signal on PI2NOS 2 eBay DIAMONDSRH805S  wide band 144/432/1200  it works for its size as expected 3 piece of wire :   best signal in the setup... Unit under test at workbench. It was stable  50mA  at 5V   few days,  but sudden the current went up to 100mA And i could  no longer adjust it with the negative bias Voltage. The - Voltage went to zero and the SPF input port became low Z. This SPF5189z was broken  no oscillations, no input overload just it broke while i was receiving the PI2NOS 430.125 using a small antenna at the workbench. The specs of  SPF5189z  say it has an internal circuit  regulating the bias current. Replaced . again   with an other of the 5 spare SPF i have. The new one again could be adjusted at 50mA  5V  The current raises to 150mA  when removing the  negative gate voltage. Where is that internal bias cir

BIJZEN mast en ontwerp fouten.

In 2013 heb ik een Bijzen aluminium mast 3 x7m  opgehaald  bij iemand die hem niet mocht plaatsen Gemeente Oss  dat zegt misschien al genoeg.. Pas in 2018 heb ik hem geplaatst had ik veel eerder moeten doen. Mooie mast, mijn xyl vond hem zelfs mooi. Hij is licht, de 3 delen wegen  235kg  het vaste deel 102kg dus het te lieren gedeelte weegt   slechts 133kg + ca 50kg rotor + antennes etc.  De elektrische lier is wel erg zwaar 30kg misschien wel maar die zit onder    Antenne  3ele Steppir  19kG  +  G2500DXC rotor: 3.6kg  + rotorbuis 12 kg  +  kabels 10kg  + 5/7 ele 6m beam. ongeveer 50kg Je moet niet te dichtbij  kijken, dan valt op dat het Aluminium lastwerk heel slordig is gedaan, scherpe bramen aan de lassen waar kabels door kunnen worden beschadigd of haken Er is zeer ! weinig ruimte voor de rotor een YAESU G2500DX past net maar dan ook net  met beetje buigen van  kruisverband. Het Rotor platform kan wel een meter hoger dat geeft meer  buislengte boven het zit nu op 3.5 meter van het