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FM band tuning noise

Discussion in 'Electronic Design' started by JC, Mar 11, 2007.

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  1. JC

    JC Guest

    Picked up a 1976ish Panasonic RF-1080 and have restored it to working
    condition with one glitch, the FM band has "noise" when tuning between
    stations.

    Not a static like sound, as best as I can descibe it a "crackling"
    sound. It pops up and moves around different areas on the dial. Could it
    be dirt on part of the tuning capacitor vanes since it's not across the
    entire dial? It's a ganged polyester film unit with AM tuning also and
    that band has no problems. What type of cleaner might be best for this
    type of cap?

    Where might one still find a service manual or schematic? And where does
    one find a large selection of replacement knobs and antennas, this radio
    has missing/broken parts which I'm sure Panasonic can not help me
    replace. - JC
     
  2. This newsgroup is for the discussion about the design of electronics.

    It isn't about the repair of electronic devices.

    There is a whole newsgroup for that, which you were either too lazy
    or too clueless to find before you posted here.

    Michael
     
  3. Jim Thompson

    Jim Thompson Guest

    Michael! Oh, CRAP! What the **** have you contributed to this group?

    ...Jim Thompson
     
  4. That could be the problem, particularly if the crackling noise is worse
    while you are tuning the unit.
    I'm not familiar with the construction details of variable polyester
    caps, but the air dielectric variables have two places that dirt can get
    in. Dust can get between the plates. For this, just blow it out with
    some canned air. Some of these units have a wiper or sliding contact for
    the rotor side which can accumulate dirt. I'd use some tuner contact
    cleaner on a thin piece of cloth or other non abrasive material. Slip it
    between the contact surfaces and clean them. I've been told that some of
    these contacts have thin plating, so abrasives aren't a good idea.
    I don't know. That might be too new to interest antique collectors. A
    friend of mine was able to locate data on a 1940's era radio he is
    restoring on the web.
     
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