1. You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
    Dismiss Notice

102” HELP!!!

Discussion in 'CB Antennas' started by BammBamm, Nov 17, 2018.

  1. BammBamm

    BammBamm Instigators ...173 on the southside.

    Joined:
    May 24, 2010
    Messages:
    575
    Likes Received:
    163
    I am running a uniden 980ssb into a RM 203p and a Tram triple magnet mount with a Tram TBC-9 antenna with a SWR of 1.2 on both ends of the band and I also have the chassis of the radio and amp grounded to the seat mount bolts in my truck now here’s the new problem...I want to use a 102” whip but when I put it in my magnetic mount my SWR goes to 2.5 and yes I’m using a spring also. What gives?


     

  2. SIX-SHOOTER

    SIX-SHOOTER Well-Known Member

    Joined:
    Oct 2, 2010
    Messages:
    250
    Likes Received:
    125
    Do you have the nylon washer in the right spot? Only thing I can think of off the top of my bald empty head. LOL

    SIX-SHOOTER
     
  3. Handy Andy

    Handy Andy Do Your Research First, Then Decide...

    Joined:
    Apr 23, 2018
    Messages:
    1,586
    Likes Received:
    1,306
    Does the Spring you use, have a GOOD QUALITY braid rising up thru the center of the coil spring?

    To determine that, you may have to bolt both ends of the spring for you to be able to torque the spring open (flex it) to show if you have a braid or not.

    The braid is to allow RF signal to propagate up thru the path of least resistance - that is supposed to be the braid inside the coil of the spring - it's attached to both the lower and upper ferrule thread mount - the coil just provides length and tensile strength to handle the whipping and whacking that the whip will encounter in everyday use...

    Usually with a S/Steel spring - the braid is supposed to be a good quality thick flex braid.

    If it's used, then corrosion may have set in and you may not be able to use it...it is broken somewhere internally and won't be able to keep the SWR low.
     
    midnight special and TheRATT like this.
  4. loosecannon

    loosecannon Sr. Member

    Joined:
    Mar 9, 2006
    Messages:
    3,121
    Likes Received:
    1,415
    unground the chassis of the radio and amp.
    check SWR.
    post results please.
    LC
     
    357magnum and midnight special like this.
  5. BammBamm

    BammBamm Instigators ...173 on the southside.

    Joined:
    May 24, 2010
    Messages:
    575
    Likes Received:
    163
    Antenna and spring are brand new. Braid is good. Not sure of what washer you are referring to as I am using a triple magnetic mount. Will remove ground tomorrow and post results as it’s about 20 degrees outside here right now (Chicago).
     
    357magnum and loosecannon like this.
  6. BammBamm

    BammBamm Instigators ...173 on the southside.

    Joined:
    May 24, 2010
    Messages:
    575
    Likes Received:
    163
    Ok I have disconnected the ground and found no difference but....if I have amp inline but powered off I have a 2.23 on 1 and 2.41 on 40.....if I power up amp I get a 1.21 on 1 and a 1.27 on 40! I almost always have it on but is this correct?
     
  7. BammBamm

    BammBamm Instigators ...173 on the southside.

    Joined:
    May 24, 2010
    Messages:
    575
    Likes Received:
    163
    Also if I take amp out of line I have a 1.83 on 1 and a 1.16 on 40!
     
  8. Shadetree Mechanic

    Shadetree Mechanic 808 On The North Side of Dover

    Joined:
    Oct 23, 2017
    Messages:
    984
    Likes Received:
    714
    Maybe a bad jumper between radio and amp?
     
  9. undertaker

    undertaker Undertaker

    Joined:
    Apr 5, 2006
    Messages:
    1,858
    Likes Received:
    704
    You do not need a nylon washer................
     
    TheRealPorkchop likes this.
  10. Tallman

    Tallman W9WDX Amateur Radio Member, KW4YJ EXTRA class

    Joined:
    May 1, 2013
    Messages:
    3,041
    Likes Received:
    2,115
    Don't check SWR with an amp in line. If you measure the SWR going into the amp and it is high then the amp is bad.
    Check the SWR straight from the radio to the antenna and see what it reads.
    Radio----SWRmeter------Antenna.
     
    midnight special and Robb like this.
  11. Mudduckmobile

    Mudduckmobile Well-Known Member

    Joined:
    Oct 5, 2015
    Messages:
    597
    Likes Received:
    234
    Just my .02 cents worth.
    I run an SWR meter at the back of my Radio, then I have my Amp, Then I have an SWR meter on to my antenna.
    I have found this to be a great way of watching my Radio's health as well as the Amp's.
    Running mobile I find this very important as mobile's tend to have some swr problems at times. (I also do the same on my home base...I like to be safe).
     
    Shadetree Mechanic and Tallman like this.
  12. Tallman

    Tallman W9WDX Amateur Radio Member, KW4YJ EXTRA class

    Joined:
    May 1, 2013
    Messages:
    3,041
    Likes Received:
    2,115
    If you have to leave your meters in line that's the way to do it. And it also works only if the radio has not been tuned for "Ghost Watts".
     
    midnight special likes this.
  13. Mudduckmobile

    Mudduckmobile Well-Known Member

    Joined:
    Oct 5, 2015
    Messages:
    597
    Likes Received:
    234
    I always have my meters inline... I have meters every place....Power lines, coax, audio levels, you name it. If I can "see it working good I know to look for the bad"....Or something like that(y)
     
    Shadetree Mechanic likes this.
  14. Tallman

    Tallman W9WDX Amateur Radio Member, KW4YJ EXTRA class

    Joined:
    May 1, 2013
    Messages:
    3,041
    Likes Received:
    2,115
    Okay I got you now, gadget nut just like me!
     
  15. Mudduckmobile

    Mudduckmobile Well-Known Member

    Joined:
    Oct 5, 2015
    Messages:
    597
    Likes Received:
    234
    (y)
    It's cheaper in the long run.
     
    Tallman likes this.

Share This Page

  • About Us

    The WorldwideDX Radio Forum was originally established in 2001. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. We are working every day to make sure our community is the best Radio Hobbyist's site.
  • Like us on Facebook

  • Premium VIP Member

    The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Care to buy us a beer? We'd really appreciate it!

    Donate to us!