Why Coax Fails

Discussion in 'Amateur Radio News' started by M1MRB, Mar 29, 2020.

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  1. M1MRB

    M1MRB Ham Member QRZ Page

    ICQPodcast Episode 321

    In this episode, Martin M1MRB is joined by Leslie Butterfield G0CIB, Edmund Spicer M0MNG, Dan Romanchik KB6NU and Ruth Willet KM4LAO to discuss the latest Amateur / Ham Radio news. Colin M6BOY rounds up the news in brief and this episode’s feature is - Why Coax Fails

    ICQ AMATEUR/HAM RADIO PODCAST DONORS

    We would like to thank Dean Sproull (VE5SPR) and our monthly and annual subscription donors for keeping the podcast advert free. To donate, please visit - http://www.icqpodcast.com/donate

    News stories include: -

    • Scientists Create Quantum Sensor that Covers Entire Radio Frequency Spectrum
    • It’s Time for Remote Amateur Radio License Exams
    • WIA Board Comment
    • Need a new hobby? Try amateur radio!
    • Fair Lawn Amateur Radio Club Begins Daily Health & Welfare Broadcasts
    • Errata to 2020-2024 Amateur Extra-Class Question Pool Released
    • Hamvention Names 2020 Award Winners
    • EU to Impose VAT on Low Value Parcels
    • Ofcom Awards Six New Community Radio Licences
    The ICQPodcast can be downloaded from http://www.icqpodcast.com

    upload_2020-3-29_16-27-9.png
     
  2. W1YW

    W1YW Ham Member QRZ Page

    It's rare that a ham will see an actual FAILURE of typical (ham use) coax.

    More likely, water vapor gets into the jacket and or inner line and oxidizes the copper and/or degrades the dielectric. This oxidation leads to ohmic loss. If you put the coax on a VNA you will see it has substantially higher 'insertion loss' on its length. A good rule of thumb is to replace your coax every 5 years, if buried underground. I rarely obey that:-(
     
    WA4KCN, WQ4G, N7GPP and 3 others like this.
  3. HB9EPC

    HB9EPC Ham Member QRZ Page

    Voilà une bonne réponse, rien est éternelle...
     
  4. W8AAZ

    W8AAZ Ham Member QRZ Page

    Insufficient sealing at the ends. Animals that like to chew on it. Lawnmowers. Most of us will not be putting in enough power to damage coax.
     
    N3CIZ, SA6CKE and AE8W like this.
  5. SA6CKE

    SA6CKE Premium Subscriber QRZ Page

    Unless someone is crazy enough to run 1kW into a RG-174.
     
    W8KIC, NC7U, W2TB and 1 other person like this.
  6. KI6PMD

    KI6PMD Ham Member QRZ Page

    Rodents ! forgetting to seal with tape is a good way to turn your cable into garden hose ! Getting some one very upset on 80# meters ! there are many other ways to damage your cable I am sure ! Hi Hi 73 all stay safe & remember April fools day is just around the corner !
     
  7. W1YW

    W1YW Ham Member QRZ Page

    REAL Source of 'coax fail...'

    coaxfail.jpg
     
    K3RW, OH6XG, VA7UO and 20 others like this.
  8. K0UO

    K0UO Platinum Subscriber Platinum Subscriber QRZ Page

    Why====WATER more than 99% of the time.

    From
    Cuts, nicks, (from poor install, rodents or holes shot in it), & number one, is from not taping and sealing connectors properly.

    Less than 1% = lightning damage
     
    VK6APZ and W2TB like this.
  9. KC2YMO

    KC2YMO Ham Member QRZ Page

    Not scared .
     
    W2TB likes this.
  10. N2EY

    N2EY XML Subscriber QRZ Page

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    SA6CKE likes this.

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