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hillbilly col Lifetime member
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Joined: 07 Sep 2007 Posts: 2377 Location: Co. Durham
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Posted: Tue Mar 08, 2011 21:18 Post subject: one for the cb guru's |
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i have a midland cb which was working perfectly until lateley....the needle used to go off the scale when i key'd mike but now only goes half way and when receiving it hardly moves where as it used to go right up depending on signal i was getting
i have checked all connections and tried a different aerial and it 's still the same.......
any ideas as it's got me stumped ![Confused](images/smiles/icon_confused.gif) _________________ LTM NO.41 |
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Posted: Tue Mar 08, 2011 21:18 Post subject: Google Ads keep this community free to join! |
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DYLAN Moderator
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Joined: 25 Sep 2006 Posts: 5115 Location: Chesterfield, Derbyshire
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Posted: Tue Mar 08, 2011 21:59 Post subject: |
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Do you mean the needle on an swr meter? or is there a needle on the midland? what type is it? _________________
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2002 S-TYPE JAGUAR 3.0 SPORT |
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hillbilly col Lifetime member
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Posted: Wed Mar 09, 2011 8:08 Post subject: |
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it's a midland 77-250k (pr27) dylan and the needle i'm on about is the s/rf on the actual cb
used to go right up when transmitting and depending on how far away i was receiving it would show a good strenth
but now it has dropped right down to half way
pic of cb
![](http://i214.photobucket.com/albums/cc145/hillbillycol/cbradio.jpg) _________________ LTM NO.41 |
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Benny90 **
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Joined: 13 Jan 2010 Posts: 54 Location: East Sussex
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Posted: Wed Mar 09, 2011 11:35 Post subject: |
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Mite be a silly question but has it got a high/low power switch? Thats what my cobra does on low. _________________ 1997 Isuzu Trooper 3.1 Duty LWB
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DYLAN Moderator
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Joined: 25 Sep 2006 Posts: 5115 Location: Chesterfield, Derbyshire
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Posted: Wed Mar 09, 2011 13:59 Post subject: |
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What setting is your srf swr switch on and what has it got (settings that is?)
If it's on Cal/Set it will go sky high if set to swr it will be lower, I dont know if this is what has happened with yours Col but just thinking of possibilities
There's a manual here for the model down/up from yours, should be similar though
http://www.cbtricks.com/radios/midland/77_250/graphics/midland_77-250_sm.pdf _________________
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2002 S-TYPE JAGUAR 3.0 SPORT |
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DYLAN Moderator
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Joined: 25 Sep 2006 Posts: 5115 Location: Chesterfield, Derbyshire
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Posted: Thu Mar 10, 2011 11:17 Post subject: |
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Did you work it out mate? _________________
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2002 S-TYPE JAGUAR 3.0 SPORT |
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hillbilly col Lifetime member
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Posted: Thu Mar 10, 2011 11:29 Post subject: |
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DYLAN wrote: |
Did you work it out mate? |
no not yet ... the s/rf meter on the cb is purely a gauge to tell you how strong you are transmitting/receiving and does not have any other function or can be set like an swr meter.......going to check aerial earth when i get a chance as that can cause this prob and will also swap it itnto my mates truck...if it's still the same then i no it's a fault with cb _________________ LTM NO.41 |
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hillbilly col Lifetime member
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Posted: Fri Mar 11, 2011 15:12 Post subject: |
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got cb sorted (fingers crossed) apparently it needed a jet wash to fix it (don't ask me why it's all witchcraft ) but s/rs meter is now working as normal
i thought the aerial may not be grounding properly but can't see how a jet wash has cured it as it's bolted to truck
rather than using a mag mount but who am i to question the greater workings of the universe
just in time aswell as i'm out laning on sun ![Very Happy](images/smiles/icon_biggrin.gif) _________________ LTM NO.41 |
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