| Author |
Message |
    
Reddog355
| | Posted on Tuesday, April 22, 2003 - 8:17 pm: | 
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Well,I went outside to work on a freinds mobile and keyed it up a few times with the big box on,well came inside and it sounded like it was receiving(ground noise)with no one talkin.I hooked up my cobra 29 and everyone was talkin hooked the 2970 back up and nothin but ground noise.I guess i screwed up by forgetting to turn it off and key the mobile up to close.Has any one had this problem?What was the fix?I started to change the diodes(forgot number but their on paper in the radio room)but wanted to get somegood opinions and info on were to start |
Sqwirl2001
| | Posted on Friday, April 25, 2003 - 10:05 pm: |
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I had this same problem.Never got a reply when I posted it!Start by checking for a bad solder connection around the PLL chip. |
2600
| | Posted on Tuesday, April 29, 2003 - 12:23 am: |
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Uh, does the radio still transmit ???? Knowing that might narrow down the problem area a good bit. The problem will be with blown parts that LOOK okay on the outside. Sounds odd that a marginal solder connection would pick that moment to go bad. If it still transmits, that's one thing. If it won't, that's another.
73 |
Sqwirl2001
| | Posted on Saturday, May 03, 2003 - 9:21 am: |
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Due to me experiencing the same problem(just normal usage and not running it through another amp though)I sent mine to RCI for repair and came back saying bad solder connection at the PLL. |
Reddog355
| | Posted on Saturday, May 03, 2003 - 12:20 pm: |
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Yeah it still transmitts just no receieve.It even sounds like it receives but just static ground noise sound,you hook another radio up and everyone is talkin. |
Reddog355
| | Posted on Saturday, May 03, 2003 - 5:32 pm: |
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Ok,this is what its doing now.
Radio transmitts fine on am and ssb.On am receive the meter moves when people talk but everyone sounds like they are on side band(ssb)and cant understand what anyone is saying. |
2600
| | Posted on Sunday, May 11, 2003 - 2:42 am: |
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The receiver has a handful of diodes just downstream from where it taps into the antenna jack. If they fail, the radio can no longer automatically adjust its internal gain to match the signal strength. If turning down the RF gain control clears up the receiver audio, a real tech needs to look at it. Receiver problems tend to confuse the average "screwdriver jockey". Testing all of these parts, and using the correct replacement type for each blown one may well fix it. There are two different types used there, so you can't just rob a couple of parts that look the same from a junker, unless you are sure the replacements match the blown ones.
73 |
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