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Thread: Aussie Feeders

  1. #951
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    Quote Originally Posted by bhaal View Post
    This is a bit extreme but will give you the idea of what I mean:

    http://www.rtl-sdr.com/reducing-usb-...l-sdr-dongles/

    a B I T extreme??? that's overkill of overkill - Unless of course he lives on or adjacent to whats known as an "RF mountain" (ours for example is Mt Coot-tha (incl high parts of Bardon, Red Hill), or on top of Waterfront Place) then yes, that would be a minimum setup.

    Merry Christmas.

  2. #952
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    Well I live within 500mtrs of our local water tower which has an unhealthy coating of cell phone transceivers, and then about 1.8km in the opposite direction is another well populated cell tower... So there is a reasonable amount of RF noise about the place, cannot wait till I add the filter and amp to my rig, and all the shielding mods, though not to the extreme of that copper based case haha... Probably mid year before it's complete I'd say...
    T-YBBN50 - Kallangur, QLD, Australia

  3. #953
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    Quote Originally Posted by bhaal View Post
    Well I live within 500mtrs of our local water tower which has an unhealthy coating of cell phone transceivers, and then about 1.8km in the opposite direction is another well populated cell tower... So there is a reasonable amount of RF noise about the place, cannot wait till I add the filter and amp to my rig, and all the shielding mods, though not to the extreme of that copper based case haha... Probably mid year before it's complete I'd say...
    500 mtrs wont be too bad at cell levels, unless they also have lots commercial gear as well, which can radiate much higher, 50 watts with 6-9db antennas and then there'd have to be a fair bit of it, and stuff that needs be close to an image, IOW, generally cell towers arent a problem.

    I cant see you gaining any advantage by overkill grounding since your not in a high RF zone, height will be your best advantage, along with masthead amplifier

  4. #954
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    Quote Originally Posted by Ressy View Post
    500 mtrs wont be too bad at cell levels, unless they also have lots commercial gear as well, which can radiate much higher, 50 watts with 6-9db antennas and then there'd have to be a fair bit of it, and stuff that needs be close to an image, IOW, generally cell towers arent a problem.
    Well I am getting a reasonable number of positions, given my antenna height, the base is 5mtrs above ground and ground is 35mtrs, the antenna itself is 2mtrs in height..

    Quote Originally Posted by Ressy View Post
    I cant see you gaining any advantage by overkill grounding since your not in a high RF zone, height will be your best advantage, along with masthead amplifier
    If I can get my antenna up another or 4mtrs should put it above the height of the 2 storey houses around me... I am aiming specifically to use a 1090Mhz amp, and I haven't seen any which would be masthead mountable...

    I have one other minor concern.. Lightning... Any recommendation on lightning suppressors? I have a lot of gear down wire of this antenna that I'd rather not have fried and short of air gapping with a wifi dongle (I hate wifi given it's lack of reliability), but that doesn't air gap the power source, the dump1090 Pi shares the same power socket as 3 weather cams and a half dozen cctv cameras, none of which I want fried. Whats the best option? Do gas tube arresters still need grounding? Just worried about insertion loss :/ HALP
    T-YBBN50 - Kallangur, QLD, Australia

  5. #955
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    Quote Originally Posted by bhaal View Post
    Well I am getting a reasonable number of positions, given my antenna height, the base is 5mtrs above ground and ground is 35mtrs, the antenna itself is 2mtrs in height..



    If I can get my antenna up another or 4mtrs should put it above the height of the 2 storey houses around me... I am aiming specifically to use a 1090Mhz amp, and I haven't seen any which would be masthead mountable...
    yeah, I have a problem with past twelve months with all the wet weather, the nearby trees have grown much higher, so I've lost out some distance low level stuff in a couple directions, and that two storey house behind me is still there so I'll never get under 900 ft YBBN, I do get down to 100ft at YRED though.. thinking about moving the antenna to other side of house but theres already a number of T&F feeders who get ground at YBBN so I probably wont bother

    Quote Originally Posted by bhaal View Post
    I have one other minor concern.. Lightning... Any recommendation on lightning suppressors? I have a lot of gear down wire of this antenna that I'd rather not have fried and short of air gapping with a wifi dongle (I hate wifi given it's lack of reliability), but that doesn't air gap the power source, the dump1090 Pi shares the same power socket as 3 weather cams and a half dozen cctv cameras, none of which I want fried. Whats the best option? Do gas tube arresters still need grounding? Just worried about insertion loss :/ HALP
    The loss would be minimal, maybe 2db, but if its a direct strike, it'll be the luck of the draw as to how much damage occurs, I've seen it where on commercial two way radios where transmitter stages are fried, but the receiver was untouched, also seen some totally disintegrate the insides, make sure its a class 1 device (firing level of 500v) and yes it must be earthed - ideally to a protected earth off your switchboard (you cant touch) or the ground stake (grey area for touching, either way you must not ever break that connection, you can clamp to it tho, I know certified/registered telco techs are allowed to do it, unless the laws changed I dont think "joe avg" can - I'll let any aussie sparkies reading this answer that one since theyd be more up on that area), and use minimum of 6mm sq earth (green/yellow) cable to that point.

  6. #956
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    Quote Originally Posted by Ressy View Post
    yeah, I have a problem with past twelve months with all the wet weather, the nearby trees have grown much higher, so I've lost out some distance low level stuff in a couple directions, and that two storey house behind me is still there so I'll never get under 900 ft YBBN, I do get down to 100ft at YRED though.. thinking about moving the antenna to other side of house but theres already a number of T&F feeders who get ground at YBBN so I probably wont bother
    I don't watch FR24 or FA much, I watch everything locally on VRS, so I am keen to see down to GND at the locals, I still may not due to the actual airport buildings, but I'm gonna give it a good shot. I can see down to 50ft at YRED, and not really sure about YCAB, somewhere between 50 and 200ft I think, don't see a lot of transponder equipped aircraft use that AP... Oh, and I can also almost see the helipad at RBWH...

    Quote Originally Posted by Ressy View Post
    make sure its a class 1 device (firing level of 500v) and yes it must be earthed - ideally to a protected earth off your switchboard (you cant touch) or the ground stake (grey area for touching, either way you must not ever break that connection, you can clamp to it tho, I know certified/registered telco techs are allowed to do it, unless the laws changed I dont think "joe avg" can - I'll let any aussie sparkies reading this answer that one since theyd be more up on that area), and use minimum of 6mm sq earth (green/yellow) cable to that point.
    I was given an arrester a few years back, it was used with 2.4ghz wireless, I am not sure what it's lower frequency range is, will have to find it and check it's stats before I go buy something.. As for the earth, I was thinking of putting down a separate ground spike to try and keep it as far away from everything else as possible... Where should the arrester be placed though? Directly below the antenna, or can I put it in a roof level to limit the length of earthing cable that would be required. The antenna will be 4 or 5 metres above roof height, so it's a lot of extra cable... Sooo many questions..

    Also.. We need someone in the Redcliffe area.. I have an MLAT blindspot locally to me below 1500ft .. And that's very annoying when I am trying to watch specifically where Polair2 is So someone in Redcliffe preferrably with a western view to me would be ideal, as it's about the perfect distance from me for MLAT to be reasonably accurate...
    Last edited by bhaal; 2015-12-23 at 02:16.
    T-YBBN50 - Kallangur, QLD, Australia

  7. #957
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    Here's a little bit of Qantas weirdness ... Firstly, the route....what the? Secondly, I guess something has gone wrong:

    weirdqantas.jpg
    T-YBBN50 - Kallangur, QLD, Australia

  8. #958
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    Quote Originally Posted by Ressy View Post
    ............. but if its a direct strike, it'll be the luck of the draw as to how much damage occurs .....
    yuuuup - had a direct strike on a palm tree next door - surprisingly, only thing it took out was any active ethernet port on my LAN - anything that had an active ethernet port, the port got zapped; took out the ethernet ports on my TV, server, an Arduino and the active ports on the LAN side of my router. Interestingly, the ADSL modem and the WAN ethernet port of the router survived !!???

    having worked in the broadcast transmission game - the only industry where you go and put a 400ft metal lightning attractor on a mountain top - I've seen some weird ass effects of a direct strike and often it doesn't matter how well you earth things - if mother nature wants to fry your piece of kit, she will !!
    Last edited by rodeo; 2015-12-23 at 11:15. Reason: typos galore!!
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  9. #959
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    Quote Originally Posted by rodeo View Post
    yuuuup - had a direct strike on a palm tree next door - surprisingly, only thing it took out was any active ethernet port on my LAN - anything that had an active ethernet port, the port got zapped; took out the ethernet ports on my TV, server, an Arduino and the active ports on the LAN side of my router. Interestingly, the ADSL modem and the WAN ethernet port of the router survived !!???

    having worked in the broadcast transmission game - the only industry where you go and put a 400ft metal lightning attractor on a mountain top - I've seen some weird ass effects of a direct strike and often it doesn't matter how well you earth things - if mother nature wants to fry your piece of kit, she will !!
    I don't mind too much if she fries the antenna and Pi it's connected to, but damn I'd like to limit to that, but it wouldn't be likely being that I have cat5e running around the outside of the house under the eaves... But yeah, you are right, a big enough strike is going to blast a whole through the house if it wants to... But if I can get some protection than I'll take it and hope it works... The next question, by adding an arrester and connecting it to ground, am I more likely to attract a strike?
    T-YBBN50 - Kallangur, QLD, Australia

  10. #960
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    Quote Originally Posted by bhaal View Post
    As for the earth, I was thinking of putting down a separate ground spike to try and keep it as far away from everything else as possible... Where should the arrester be placed though? Directly below the antenna, or can I put it in a roof level to limit the length of earthing cable that would be required. The antenna will be 4 or 5 metres above roof height, so it's a lot of extra cable... Sooo many questions..
    We were taught to use the buildings electrical ground system, as a separate rod wont do much good due to the electrical potential rise that would occur with such high power of a strike, we put the arrestors close to equipment or where cables enter the building, not up the masts, so roof level (assuming thats where it enters the building) would be fine.

    Quote Originally Posted by bhaal View Post
    Also.. We need someone in the Redcliffe area.. I have an MLAT blindspot locally to me below 1500ft .. And that's very annoying when I am trying to watch specifically where Polair2 is So someone in Redcliffe preferrably with a western view to me would be ideal, as it's about the perfect distance from me for MLAT to be reasonably accurate...
    We have a lot of people covering YRED, but I suspect they are windows feeders or regular dump1090 users like myself, I know T 1, 27 and I think 29 and Sunny Coast 2 also sees ground or very close to it at YRED, FR24 are severely limiting themselves for only supporting mlat on pi's

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