Atlas 210x with carrier oscillator way off frequency...

Discussion in 'Radio Circuits, Repair & Performance' started by KB0MM, Oct 25, 2015.

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  1. DV9IOQ

    DV9IOQ Ham Member QRZ Page

    Hi, just hoping this thread is still active. I recently got an Atlas 210x and found out that it transmits and receives in slightly off-frequencies (though really not that far off) . During QSO's I would have to make the other guy sound "mickey mouse" just so I would sound "natural" to him. Has anyone experienced this? How did you deal with it? I would appreciate it if somebody can help me on this one... 73 de DW7DWB
     
  2. W9GB

    W9GB Ham Member QRZ Page

    IMG_3669.JPG
    ON6AB Service Information on Atlas 210x and 215x transceivers.
    http://www.qsl.net/on6ab/Atlas.html

    Use a frequency counter or service monitor and determine the actual frequency (crystal oscillators) used in mixing scheme.

    This was noted in July 2012, here on QRZ.
    http://forums.qrz.com/index.php?threads/connection-counter-frecuency-on-atlas-210x-help.351290/

    RF Parts (San Marcos, California, USA) has a small collection of Atlas radio parts, for restorers.
    https://www.rfparts.com/radioamp-service/radiorepair-atlas.html?p=1

    Old Atlas Newsletter
    http://atlas.wireless.org.uk/Atlas Radio Newsletter.pdf
     
  3. DV9IOQ

    DV9IOQ Ham Member QRZ Page

    Thanks W9GB... I really appreciate the quick reply. Another thing about my Atlas 210x is that the TX/RX relay does not release after letting go of the PTT. I have to give it a gentle nudge to force the relay to switch back to RX mode.... What could have possibly cause this? ... 73 de DW7DWB
     
  4. W9GB

    W9GB Ham Member QRZ Page

    Do you know how a relay works?
    What you are observing is Ab-normal behavior.
    SO, what are the external conditions that would cause this?
    IF you know a relay's Normal behavior -- THEN measure what is "not normal".
    ---

    Quick Investigation leads:

    1.) Mechanical issue within relay. Dirty, sticking contacts, bad spring.
    2.) Electrical issue with relay coil. Leakage of capacitor or switching transistor in coil circuit.
     
  5. DV9IOQ

    DV9IOQ Ham Member QRZ Page

    Thanks again... will follow your leads. Actually, I have already performed a tedious and careful cleaning of the relay, so lead #2 is next...
     

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