Using An Antenna Matcher? Good or Not So Good?

Discussion in 'CB Radio Forum' started by The Truckist, Dec 6, 2011.

  1. The Truckist

    The Truckist Medium Load Member

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    Thanks, Dubya...but I'm not sure what you mean by "it will do little".
     
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  3. The Truckist

    The Truckist Medium Load Member

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    Thanks, kd. The Para Dynamics is a cheap little box and maybe you get what you pay for in this case? I'm looking into the MFJ.
     
  4. WA4GCH

    WA4GCH Road Train Member

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    A matchbox ( AKA ANTENNA TUNER ) does nothing if you already have a good match ( AKA SWR READING ) ALL tuners are inpedance transformers which change the antenna inp to match the radio inp and ALL will give you some LOSS.

    They only help if the match is too poor for the radio to work right.
     
  5. The Truckist

    The Truckist Medium Load Member

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    OK. I understand that about a good SWR. The only reason I thought about using a matcher was the fact that the SWR will most likely change when a unit is loaded in that position as opposed to nothing up there when empty. The antenna is adjacent to this car (or van, SUV) when loaded and there's not a lot I can do about that as far as moving it, etc.

    I guess a matcher in my case is probably imperative rather than optional, especially if I turn on an amp.
     
  6. WA4GCH

    WA4GCH Road Train Member

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    EVEN a simple one will help what you get for your money is a wider range of matching and some have a built in SWR meter ( like the MFJ ) like anything else you can OVER BUY too .....
     
  7. mike5511

    mike5511 Road Train Member

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    The one I have might be one of those "over buys" to run in a truck. Although
    I used and had plenty of room on the dash. (passenger side)
     
  8. The Truckist

    The Truckist Medium Load Member

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    Thanks for the replies here all.

    Rather than start a new thread, I'll just throw this out in this matcher thread. My Stryker has an antenna flasher on the dial which I guess is kinda like a dummy light on the dash of a car....if it's flashing, it needs attention vs having a gauge reading current status. I had my SWR set right then I plumbed and wired everything to include an amp (new out of the box and mated to the radio on a bench). New good quality coax all the way. I mounted my amp remotely, run the coax, got everything wired and fused then I hooked up my SWR meter. Without changing anything else, I started with the SWR saying now my antenna was "long". So I started shortening the whip. I got it down to 1.2:1 on channel 1 and 1.5:1 on channel 40. My antenna flasher was flashing on both channel 1 & 40 even with the SWR at this ratio. Re-checked SWR with another meter I had and it verified the readings were correct. On channel 21, SWR was 1.3:1.

    My question...can the flasher feature on these radios be off? Is there an adjustment? It did not flash prior to installing the new amp. I have not turned the amp on and did not have it on checking and setting SWR today. I'm sure the SWR is OK but I don't understand why the flasher would be blinking if I have it this close. Same condition as before...no load on cab, etc.

    Worry about it or not?
     
  9. AB7IF

    AB7IF Light Load Member

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    I see no mention of which model but in any case first be positive SWR is good. Odds are the reactance loading the radio in the input of the amplifier (likely COR circuit connection) is tripping the comparator circuit on the antenna warning board. If so adjust VR1 on the little board up high near the final section to where it just stops the flashing. Or make like an Ostrich and flip the switch in the rear to turn it off. Assuming you do not really have SWR problems of course.
     
    The Truckist Thanks this.
  10. The Truckist

    The Truckist Medium Load Member

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    The radio is a 447 model. It doesn't have a switch on the back to turn off the flasher like some earlier models did. I just found out today that there is adjustment inside for the AWI.

    I've checked, checked and re-checked SWR making certain it was consistent. 2 different meters. I checked it between the radio and the amp but reading today, I saw I should be checking between the amp and the antenna too. I figured it was all one line and SWR should be the same at the second point.All this is with the amp OFF. I haven't even turned it on yet until I verify I am good to go on this antenna warning.
    Thanks for the advice.
     
  11. AB7IF

    AB7IF Light Load Member

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    Keep in mind when you do run it the radio will be looking at yet again a new impedance upon key up as it will now be looking at the input circuitry of the amplifier. Also I do not even know what amp. Any time you talk to a technician they will if a good one be going through the actual schematic in their mind in diagnosis. Which makes it nearly impossible to do as people posting questions invariably give little specific useful information. This is because the user is looking at the symptom while the technician needs to be looking at the circuit.
     
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