Connect with us

"Ravensbourne 2" FM tuner

Discussion in 'Electronic Repair' started by Engineer, Mar 5, 2004.

Scroll to continue with content
  1. Engineer

    Engineer Guest

    Hello.
    I'm in need of some help on this one...

    My circa 1960's vintage Rogers "Ravensbourne 2" transistorized (no
    IC's) stereo FM tuner receives all FM stations but with "twittering
    birdies" in the background.

    If I had the schematic I'd re-align it - but I don't have one and a
    Google search drew a blank .

    My questions to this group are:
    1. What is the cause of "birdies" in analog FM tuners?
    2. Does anyone have a Rogers "Ravensbourne 2" tuner schematic?

    Many thanks for all replies.

    Cheers,

    Roger (no connection!)
     
  2. Jerry G.

    Jerry G. Guest

    I would not do a realignment, since it was working correctly before. From
    the age of it, there are probably a number of components that drifted off
    value. Use an ESR meter to test all the caps, and replace the defective
    ones.

    Stay away from tampering in the front end where the oscillator and RF amp is
    located. This is a critical area, and just bending something out of place,
    or adding too much solder somewhere will effect its performance.

    Your best bet for success is to find a good tech who is experienced on FM
    tuner servicing, and has the necessary test gear to do the testing of it.
    This way you will have the unit reliably serviced.

    --

    Greetings,

    Jerry Greenberg GLG Technologies GLG
    =========================================
    WebPage http://www.zoom-one.com
    Electronics http://www.zoom-one.com/electron.htm
    =========================================


    Hello.
    I'm in need of some help on this one...

    My circa 1960's vintage Rogers "Ravensbourne 2" transistorized (no
    IC's) stereo FM tuner receives all FM stations but with "twittering
    birdies" in the background.

    If I had the schematic I'd re-align it - but I don't have one and a
    Google search drew a blank .

    My questions to this group are:
    1. What is the cause of "birdies" in analog FM tuners?
    2. Does anyone have a Rogers "Ravensbourne 2" tuner schematic?

    Many thanks for all replies.

    Cheers,

    Roger (no connection!)
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-