| Author |
Message |
    
Swamper105
New member
Username: Swamper105
Post Number: 1
Registered: 12-2004
| | Posted on Monday, March 21, 2005 - 2:36 pm: | 
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receives fine on am and ssb . Transmits fine on am . The ssb side receives but I lost my transmit . So in the nut shell it works good on Am . , when I switch to SSB it will receive ok but no transmit |
Kid_vicious
Intermediate Member
Username: Kid_vicious
Post Number: 295
Registered: 9-2004
| | Posted on Monday, March 21, 2005 - 10:08 pm: |
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swamper105, i think there is a cap in this radio, that if it goes bad, you will have no ssb transmit. i will check my refernce material when i get home tonight. check back in a day or two.
matt |
Swamper105
New member
Username: Swamper105
Post Number: 3
Registered: 12-2004
| | Posted on Monday, March 21, 2005 - 11:38 pm: |
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I would very much appreciate it |
Kid_vicious
Intermediate Member
Username: Kid_vicious
Post Number: 298
Registered: 9-2004
| | Posted on Tuesday, March 22, 2005 - 10:15 pm: |
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ok, im not done looking yet, but here's something to get you started.
in these radios, there are a mess of electrolytic capacitors that are rated at 10 volts. these are all used in circuits using less than that, but these are still the most likely parts to fail due to age. look near the rear right corner of the radio. (radio facing you, right side up)
just in front of VR12 (AMC) you will see a group of elec. caps. using a flashlight, look closely at each one. make a note of any that are 10volts, and buy 16volt or higher replacements. dont bother checking them, just replace them. you could replace ALL of the elec. caps, but this is pretty time consuming.
replace C18 first. see if this fixes your problem. next, try C95. i'll post more as i find them. also, look at TR41, its probably a 2SC1419. these are junk, replace it with an NTE152 and dont spare the heat sink compound.
let me know how its going.
matt |
Swamper105
New member
Username: Swamper105
Post Number: 7
Registered: 12-2004
| | Posted on Wednesday, March 23, 2005 - 9:31 am: |
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Thanks kid .I`ll was thinking the same thing about the caps i ran into a no modulation on AM problem with a 148 gtl and it was c18. Your a great guy thanks . What ever you can think of if theres any change i let you know |
2600
Advanced Member
Username: 2600
Post Number: 516
Registered: 7-2002
| | Posted on Thursday, March 24, 2005 - 2:33 am: |
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Sounds like it's past time for me to write up the "Ten-Volt Blues" web page. A handful of specific caps will shut down 1) all transmit, 2) transmit audio only (am and ssb), 3) receiver audio, but not transmit audio, and 4) makes SSB transmit choppy and AM transmit weak, both at once.
This problem isn't on that list, unfortunately.
73
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Kid_vicious
Intermediate Member
Username: Kid_vicious
Post Number: 312
Registered: 9-2004
| | Posted on Friday, March 25, 2005 - 12:32 am: |
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i know ive read about this exact problem before. and i think it was a bad cap. ill find the info, just give me some time.
matt |
Sg569
Intermediate Member
Username: Sg569
Post Number: 109
Registered: 12-2004
| | Posted on Sunday, March 27, 2005 - 3:33 pm: |
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Please do 2600 I want to learn more about what causes what prob.
sg569 |
