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Bose AWRC1G wave radio

Discussion in 'Troubleshooting and Repair' started by kempga, Jun 29, 2017.

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  1. kempga

    kempga

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    0
    Jun 29, 2017
    tried to hook up external antenna for better reception (75 ohm). no change in reception. used ohm meter to antenna connection,no reading on meter. any help?
     
  2. davenn

    davenn Moderator

    13,672
    1,891
    Sep 5, 2009
    welcome to EP :)

    I have absolutely no idea what that means, please clarify
     
  3. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    A 75Ω connection describes the impedance of the cable which should be connected to an antenna of 75Ω.
    A dipole half a wavelength long will look like a 75Ω resistance at its resonant frequency.
    There will be no DC connection between the two sides.

    Some antennae have folded elements and will show a DC short, this is most common with TV antennae. You will also see a short with a halo where the cable is tapped into the element.
     
  4. davenn

    davenn Moderator

    13,672
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    Sep 5, 2009
    antennas, not antennae ;) antennae are on insects

    also, for interest, a folded dipole is 300 Ohms ( at resonant freq)
     
  5. 73's de Edd

    73's de Edd

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    Aug 21, 2015
    Sir kempga . . . . .

    Me thinks that the mentioned resistance testing is to see if there is continuity between the F connection shell and the central pin connection going on into the internal FM tuner .

    THAT IS . . . if there is NO series capacitor being involved in its circuitry design.

    My left reference is showing the standard connection of a bit of RF parasitic wire with its proximity / capacitive coupling to the AC line to pick up and get some acquired FM RF into the radio.
    That is the case in its factory shipped condition.

    If more sensitivity is needed there is the option of external FM antenna input.

    BUT that metal boxed tuner schematic does not show on the main schematic, to see if a series cap is being inside.

    That should explain all of that, UNLESS your problem is related to AM reception in which case on your age of a set I believe that they had an external AM antenna loop that connects to the radio via a miniature phone plug in addition to and . . . . vice the F connector used on the FM section.
    That connection goes into and feeds into a coupling winding on TP611 and TP 612 on the internal AM Ferrite loopstick.

    You can get one of them via E-bay if yours is lost or if you are a second owner and never even knew of such a possibility of that AM accessory existing .

    Now . . .which is your situation ?
    If its the AM situation, I can give you another alternative.

    Tech Info Illustration:

    Bose Wave Antenna info.jpg


    73's de Edd
     
    Last edited by a moderator: Jul 1, 2017
    Richard9025 and davenn like this.
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