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What kind/make of antennae are you using? Did you have it properly matched to the radio with an SWR meter? Possibly a short in the antennae wire? We need more info from you but you could check out what I've mentioned.
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use the vr adjustment points to adjust the AMC modulation. DO NOT cut the mic audio limiter tr-32 or the modulation limiter tr-54. it will over-modulate and splatter out of band if you do
you probably have a thermal problem.Get some mr.freeze and try it again .when the radio goes out spray some Mr.Freeze onto the final area.Just a dash will do,don't want to freeze the parts just want to cool the down quick to see if the radio comes back on. If it does go to the final when it goes back out and spray a little on it .If it comes on then change the final and problem almost solved. Now wait to see if it goes out again , If it does then you have to get a block diagram to work from and spray some Mr.Freeze on the main IC while you're at it. If it comes on then it should be changed .Now that everything is new it had better be working but if not start spraying other componants until the radio comes on and stays on .
Some possible issues may be a miss aligned receive section or a possible bad component in the receive section.
From my experience, Galaxy radio's have a much quieter receive, as were the cobra 29 seems to be a bit more loud, with more background noise.
The cobra 29 still has one of the best receives out there. There may be louder static, but it picks up amazingly.
If this radio had a clarifier it would be easy to tell if the receive was off. You could just tune it as you are receiving, and if it got better as you tuned it off center you would know. Otherwise you would have to open the radio, and adjust the receive by ear, which is something where you may do more harm then good.
The proper way to align the radio requires the use of a watt meter and volt meter, which are easy to come by, but as well you will need an oscilloscope, which is a more expensive piece of equipment to own.
If the unit is new, then it's under warranty. Contact galaxy, see what they say. Their tech support is pretty good.
But ALL in ALL,
If the unit seems to be receiving on freq, (no muffled or distorted receive) and it is working well besides having a less sensitive receive, then I would say it's just that radio.
I have a galaxy base radio, and it has a real clean quiet receive, but my cobra 29's seem to have a more sensitive receive, but I like that galaxy because there is less noise.
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