| Author |
Message |
    
Troyota
Junior Member
Username: Troyota
Post Number: 14
Registered: 4-2004
| | Posted on Tuesday, November 13, 2007 - 2:12 pm: | 
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a friend of mine brought me a 148 gtl phillipene model made in 1990. the modulation on this is very low. it has had variable key already in it. wired into vr 10. also it has had a mod kit with another variable key in it??? when i got it i can set the variable at 1/2 watt and it will swing 3. or i can set it at 3 and it will stay still no swing. so i tried to peak and tune, maybe got another 1/2 watt swing. anyway i unhooked the mod kit and hooked it back up without it and no change. turned r7 with no luck so, i put it back. i clipped 131 with no change, so i put it back. this has not had the r 194 changed with the 4001 diode. do you think this will help? or does it have more troubles? modulation transformer or audio chip weak? |
Troyota
Junior Member
Username: Troyota
Post Number: 15
Registered: 4-2004
| | Posted on Tuesday, November 13, 2007 - 5:42 pm: |
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thought i would add a little more. the key watts will only key about 3 watts max. everything else seems to work fine. rx and ssb ok. just about 5 watts swing on ssb. should be way stronger. |
Unit199
Advanced Member
Username: Unit199
Post Number: 559
Registered: 8-2003
| | Posted on Tuesday, November 13, 2007 - 5:48 pm: |
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IMHO,I would say that it needs more than a diode for resistor change. It could have a weak final.
HARVE
UNIT199
CEF210
CVC#18
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Tech858
Moderator
Username: Tech858
Post Number: 48
Registered: 10-2007
| | Posted on Tuesday, November 13, 2007 - 6:09 pm: |
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Possible audio tranny fault and maybe worth checking the voltage regulator chip too .
Tech858/Jim
MM0TXO
CEF#858
HAM#230
CVC#116
Wavin' a hand at ya' fae Scotland 
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Troyota
Junior Member
Username: Troyota
Post Number: 16
Registered: 4-2004
| | Posted on Tuesday, November 13, 2007 - 10:20 pm: |
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thanks very much for your insight. i was thinking maybe a final is weak. i looking thru my parts to see if i have an extra one. but before i do that. where is the audio tranny located? and the voltage regulator chip and what voltages should i expect? thanks for your help. |
Tech858
Moderator
Username: Tech858
Post Number: 50
Registered: 10-2007
| | Posted on Wednesday, November 14, 2007 - 12:04 pm: |
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Troyota
If you send me you're e-mail address to me I will send you info from the service manual for the 148 , you will find my e-mail in the CONTACT area under utilities on the sidebar to the left .
Tech858/Jim
MM0TXO
CEF#858
HAM#230
CVC#116
Wavin' a hand at ya' fae Scotland
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Troyota
Junior Member
Username: Troyota
Post Number: 18
Registered: 4-2004
| | Posted on Wednesday, November 14, 2007 - 9:12 pm: |
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thanks jim,
sent you an email. |
