| Author |
Message |
    
Liz
| | Posted on Sunday, December 01, 2002 - 11:18 pm: | 
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The radio puts out 2watts on am and has no modulation,sideband USB/LSB transmits fine with no receive I've changed speakers and external speakers oh the PA doesent work either. The radio lights up the S-meter doesn't move and not a peep of receive. Can a technician please help I would like to fix it myself any and all HELP would be appreciated. Thanks Liz. |
307
| | Posted on Monday, December 02, 2002 - 6:35 pm: |
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Does the "S" meter work at all? Thats strange...I would have said to change the Audio IC....Thats most likely the problem in these cases , however with the "S" meter not working , it is 50/50...
TA7222AP is the IC...
307 |
2600
| | Posted on Monday, December 02, 2002 - 11:45 pm: |
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Ummm Liz, did this thing perform normally and then just QUIT all at once? Did it work until you loaned it to someone, and didn't when you got it back? Or is this a radio that has NEVER worked for as long as you have had it? If someone has worked on it since it failed, other things may have been messed up besides the original problem. If any adjustments have been turned, who can tell if they are set right if it won't receive at all?
The symptoms you described CAN each have more than one possible cause. Besides, you have more than one problem, with no AM modulation and NO receive. Oops, forgot to ask if SSB receive has any audio or meter jiggle. That alone makes the list of possible causes REALLY long. The 148 has been around for nearly 25 years, and made in a half-dozen factories. A 20-year old radio made in Taiwan SHOULD have problems that a 3-year old one made in Thailand shouldn't have, yet.
If you can narrow some things down, like where it was made (or when), or did it work and then quit all at once, or did someone turn all the adjustments inside, so that now you need the tools to set them BACK where they belong? What tools have you got, besides a wattmeter? A frequency counter is pretty well a must if you have to align a SSB radio.
Help us out with some info, we'll see what we can figure out. Might be enough, might not.
And if three different people have worked on it, and it still doesn't receive, you need a real expert who can sort out multiple problems. A single problem is always easier to track down and fix.
73 |
Cdn_superpower
Junior Member
Username: Cdn_superpower
Post Number: 33
Registered: 6-2005
| | Posted on Tuesday, May 23, 2006 - 12:54 pm: |
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Thats interesting, my cobra 2000 is stamped taiwan...... |
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