✈✈ Aviation ✈✈

Rudderyaw

Member
Jul 2, 2015
3
4
0
yes:) I was thinking about it. after digging through the internet, i found this:)
groundplane_outside.jpg

Well, not bad. This is known as ground plane antenna. But you need high gain antenna for this purpose.
There are two types mainly
1. J-pole (omni-directional)
2. Moxon (Directional)
I think in your case, J-pole would be the right one. This can be constructed using ½ inch copper tubes. You can buy these tubes from AC repair shops.
Take 125MHz as the center frequency (so that you can listen to all from 118-137) Also you need RG 58 (50 ohms) cable. From second Cross Street you can buy this. 1m would cost you Rs 55-80
 

Local Disk (c:)

Well-known member
  • Apr 13, 2011
    4,194
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    A320 Hanger
    Well, not bad. This is known as ground plane antenna. But you need high gain antenna for this purpose.
    There are two types mainly
    1. J-pole (omni-directional)
    2. Moxon (Directional)
    I think in your case, J-pole would be the right one. This can be constructed using ½ inch copper tubes. You can buy these tubes from AC repair shops.
    Take 125MHz as the center frequency (so that you can listen to all from 118-137) Also you need RG 58 (50 ohms) cable. From second Cross Street you can buy this. 1m would cost you Rs 55-80

    thanks for the info. I really wanna try this. :)
    440-UHF-GMRS-j-pole-antenna.jpg
     

    Magodis-Thuma

    Well-known member
  • Apr 29, 2010
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    Magodilanthe
    These are the VHF frequencies use in air traffic control in Sri Lanka
    118.700 BIA Tower
    121.900 Ground Operation -Katunayake
    119.100 Ratmalana Tower
    124.900 Colombo Radar - Having its centre at Ratmalana Airport premises. Antenna fixed at Piduruthalagala mountain
    132.400 Colombo Director – Operation centre at Katunayake
    As soon as an aircraft reaches (South East sector) approximately 200 NM (VHF communication is not capable beyond this range) Colombo radar hands it over to HF. This centre (Colombo Radio) and the Colombo radar (124.900 MHz) are sharing the same building at the Ratmalana airport premises.
    These are the main frequencies use in Colombo Radio
    11285/6556 (11.285MHz 6.556MHz) You can listen to this ratio by tuning these frequencies in your short wave radio. As these channels use (single side band) you need a BFO (Beat frequency oscillator) or a radio with SSB. However, in a short wave radio still you can listen without having SSB BFO facility but hard to understand clearly as it uses different modulation
    CPDLC – will be used as an alternative to HF (High Frequency) But some aircrafts doesn’t have this facility onboard. They rely on HF. Some prefer to use HF to cut their operational costs (CPDLC is a commercial service and need to pay)
    I admire your work and thankful to every one of you for attempts taken to take aviation another step closer to Sri Lankans.

    Thanks Mate! Seems we got a one here who really knows about these stuff (Not like mos of us!):D
     

    Magodis-Thuma

    Well-known member
  • Apr 29, 2010
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    Magodilanthe
    කට්ටියට මේක මතකයි එනද -අද ප්‍රිලිමිනරි රිපොර්ට් එක ඉශූ කරලා - පයිලට් කන්ෆියුශන් ලු!:(:(:(


    Taipei-crash-2.png


    Source
    An official report into the fatal crash of a TransAsia Airways ATR 72-600 aircraft on 4 February confirms that the pilot flying retarded the aircraft’s only good engine

    Three seconds after the engine 2 flame-out occurred, the aircraft’s autopilot was disengaged while climbing through 1,300ft.

    Two seconds later, at 10:52:43, the pilot flying said, “I will pull back engine one throttle,” to which the pilot monitoring replied: "Wait a second cross-check.” Nonetheless, the flight-data recorder indicates a sharp reduction in the engine 1 power lever angle.

    Over 20s later, the pilot flying appears to have again reduced power to engine 1. Meanwhile the aircraft reached its highest altitude, 1,630ft, and started to descend. This was followed by a stall warning and the activation of stick-shakers.

    At 10:53:15, the crew were still unaware that that they had retarded the wrong engine, pushing the engine 2 throttle forward, while further retarding engine 1. Subsequently, the engine 1 condition lever was placed in the fuel shut-off position, and the propellers were feathered.

    At 10:53:35 the pilot monitoring declared an emergency flame-out and 30s later said: “Both sides lost.”

    The crew tried to restart the engine as the aircraft descended. Finally, at 309ft and a speed of 105 knots, the pilot flying said: “Wow, pulled back the wrong side throttle.”

    Shortly thereafter the aircraft crashed into the Keelung River. Of the 58 occupants, 43 died and 15 were injured. Two people on the ground also sustained injuries
     

    navodwickra

    Well-known member
  • Jan 17, 2007
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    Leeds, UK
    කට්ටියට මේක මතකයි එනද -අද ප්‍රිලිමිනරි රිපොර්ට් එක ඉශූ කරලා - පයිලට් කන්ෆියුශන් ලු!:(:(:(


    Taipei-crash-2.png

    මම GTA V එකේ Plane land කරන්නේ මෙහෙම තමා :sorry:
     

    rochel1977

    Well-known member
  • May 15, 2006
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    AKL, NZ and Kandy
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