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Thread: best antenna

  1. #2741
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    Quote Originally Posted by abcd567 View Post
    First you should try improving the antenna.
    After antenna improvement is done, then add an amplifier.
    Good advice, thanks! Just straightened out my radials, added 4 more to make it an 8-legged spider, and I'm already seeing an improvement. I'll post back with results after a few days.

  2. #2742
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    Weather proofing makes ALL the difference, moisture is drawn into the coaxial cable like a sponge... even a night out with dew will draw in water - doesnt need to rain !!!
    Ive seen many a cable ruined this way, and theres no recovery... ALWAYS seal the end of the cable - beeswax, self amalgamating tape etc.
    Once moisture enters the cable the losses mount up exponentially...

  3. #2743
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    How-to Protect Outdoor Connectors and Cable From Ingress of Moisture (Due to Rain & Snow) and Resulting Short circuit, Corrosion, and Drop in Performance.

    The simplest way to protect your connectors and cable from ingress of moisture is to wrap self-amalgamating / self-fusing / self-bonding tape over the connectors. Please do NOT use ordinary electrical PVC tape as it wont protect properly, and soon deteriorate.

    An additional step in case of RG6 cable is to use Water Resistant type F-connectors which have built-in O-rings.

    Examples of applying self-fusing tape on antenna and coax connectors are given below:




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    https://www.amazon.co.uk/gp/aw/s/ref...lgamating+tape
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    Last edited by abcd567; 2019-01-22 at 04:13.

  4. #2744
    First officer 1090 MHz's Avatar
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    This is the one I use, Silicone Self-sealing Tape: https://www.homedepot.ca/en/home/p.t...00104039.html#
    It's in the electrical section.

  5. #2745
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    Quote Originally Posted by 1090 MHz View Post
    This is the one I use, Silicone Self-sealing Tape: https://www.homedepot.ca/en/home/p.t...00104039.html#
    It's in the electrical section.
    Thanks!

    Also, I’m looking for input on mounting solutions. Basically I need to figure out how to securely attach my antenna mast to the side of my building without drilling any holes (renting an apartment).

    The outside of my building is brick, and the brick protrudes about 1/4” from the mortar. I found some “brick clips” (like this: 4 Metal Brick Clip Fastener Hooks ) meant for hanging pictures, so my first idea is to somehow attach a PVC pipe to the brick clip, and then attach the mast to the PVC with either an elbow joint or something similar. The idea here is to get the antenna out away from the side of the building, ideally about 8” or so. However, I’m not sure that the brick clips are sturdy enough to support the weight of the mast + antenna.

    Option 2 would be to attach the mast to the fire escape railing outside one of my windows. The fire escape is of a fairly rudimentary style - just a ladder surrounded by a cage, not one of the (safer) stairway varieties. This option would be my first choice, but the closest window to the fire escape is also farthest from any interior power supply, so I’d have to run the coax cable quite a distance along the outside of the building to feed it through a different window where I can easily attach it to my RPi.

    So: has anyone successfully made an antenna mast that can:

    • attach to a window without drilling holes?
    • Attach to a brick facade without drilling holes?
    • Cleverly use gravity to “pin” the mast against the building?

    I've looked into using some kind of flag pole mounting solution, but so far it looks like I’ll have to Macgyver my way to a stable solution.

    Thanks for any help!

  6. #2746
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    1/4 wave antenna is very small and light... mount it on a bit of plastic conduit (or whatever you can find)
    Maybe hot glue would attach it to the brickwork in a few places ?
    Or maybe you could simply stand a "spider" in the guttering... even on a window sill would capture some aircraft.
    I have in the past used aluminium security tape to make antenna for amateur radio - this is self adhesive, and just sticks to the glass (its used in burglar alarms systems to detects a broken window)
    If theres a down pipe nearby, construct a coco and waterproof it, then simply wedge it into the top of a down pipe !

    There are dozens of ways to skin this cat ! LOL

  7. #2747
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    Two more questions for you hardware experts...

    • How much of a difference does RG8 coax make over the more commonly available RG6? I know the technical difference of 75ohms vs 50ohms, but I don't know how that difference is seen for ADS-B frequencies.
    • I've had limited success with soldering copper wire to a SO-239 connector. The solder doesn't take very well. Do I need additional flux? Maybe some cleaning solution on the connector first?


    Setup is coming along great... lots of planes so far. Just perfecting and building a second site.

  8. #2748
    Captain abcd567's Avatar
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    Last edited by abcd567; 2019-02-25 at 20:37.

  9. #2749
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    250+ nm?! Consider it done.

  10. #2750
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    Quote Originally Posted by aesoprrp View Post
    250+ nm?! Consider it done.
    Not necessay that every install gets 250+ nm. Only if no high rise building is obstructing the view of horizon, and antenna can "see" the horizon. Also the length of coax between antenna and DVB-T should not be long.

    My apartment (inside which Quick Spider is located) is about 60 feet / 20 meters above road, and I get 250+ nm only in unobstructed directions. In directions where there are high rise buildings, I get much less max range.

    The length of RG6 coax between my Quick Spider and the DVB-T/RPi is about 12 feet / 4 meters.

    It is worth trying Quick Spider. Whatever your location and height, the Quick Spider performs NOT LESS than the SO239 Spider at same location and height.
    Last edited by abcd567; 2019-02-25 at 22:45.

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