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superzeeman
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Post subject: Tuning noise  Posted: Jun Sat 30, 2012 3:36 am |
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Joined: May Sun 13, 2012 2:30 pm
Posts: 277
Location: Mapleton, Mn
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I just recapped a radio and it plays very well and tunes very nice until I hit the 1500kc area and it "scratches" a bit then you can move on to the end of the range. it does not happen anywhere else on the dial, just there. Im thinking a bent plate?
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Pbpix
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Post subject: Re: Tuning noise Posted: Jun Sat 30, 2012 3:41 am |
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 9334
Location: Haledon, NJ, usa
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Could be. Have you examined the condenser plates?
If you can't tell by eye... you can turn off the radio and connect a DMM across the tuning condenser and set it for a continuity-beep.
Then slowly tune the plates and see IF AND where it is when it beeps. Then you can gently separate the plates till the beeping stops.
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superzeeman
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Post subject: Re: Tuning noise Posted: Jun Sat 30, 2012 3:53 am |
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Joined: May Sun 13, 2012 2:30 pm
Posts: 277
Location: Mapleton, Mn
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Not to sound like a newbie, but I am, what is a DMM?
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Alfred Corbin
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Post subject: Re: Tuning noise Posted: Jun Sat 30, 2012 4:01 am |
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Joined: Jul Sat 01, 2006 11:17 pm
Posts: 1121
Location: Northwest Florida (Panhandle)
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superzeeman
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Post subject: Re: Tuning noise Posted: Jun Sat 30, 2012 4:03 am |
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Joined: May Sun 13, 2012 2:30 pm
Posts: 277
Location: Mapleton, Mn
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Ok, gotcha. I just broke mine, so I need to go get one anyway,
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Jack Shirley
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Post subject: Re: Tuning noise Posted: Jun Sat 30, 2012 4:18 am |
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Joined: Mar Fri 14, 2008 1:40 pm
Posts: 8563
Location: SE USA
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How did you break it? It may be repairable.
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Pbpix
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Post subject: Re: Tuning noise Posted: Jun Sat 30, 2012 4:35 am |
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 9334
Location: Haledon, NJ, usa
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DMM means Digital Multi-Meter 
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" To be a man, Be a non-conformist, Nothing is as sacred as integrity of your own mind." Emerson
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Brett_Buck
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Post subject: Re: Tuning noise Posted: Jun Sat 30, 2012 5:49 am |
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Joined: Aug Wed 24, 2011 4:35 am
Posts: 1300
Location: Sunnyvale CA
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superzeeman wrote: I just recapped a radio and it plays very well and tunes very nice until I hit the 1500kc area and it "scratches" a bit then you can move on to the end of the range. it does not happen anywhere else on the dial, just there. Im thinking a bent plate? Maybe a bent plate, maybe some conductive crud in the plates, maybe some intermittent connection with the "fingers" that connect the shaft of the tuning cap electrically. Brett
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codefox
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Post subject: Re: Tuning noise Posted: Jun Sat 30, 2012 5:59 pm |
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Joined: Nov Sat 27, 2010 6:15 pm
Posts: 3677
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You can find out which plate is scraping with a piece of paper. If it binds, that's the one. Ususally on one end of the stack.
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superzeeman
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Post subject: Re: Tuning noise Posted: Jun Sat 30, 2012 6:35 pm |
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Joined: May Sun 13, 2012 2:30 pm
Posts: 277
Location: Mapleton, Mn
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Great Tip with the paper!
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