| Author |
Message |
    
Bluebird
Member
Username: Bluebird
Post Number: 74
Registered: 2-2004
| | Posted on Friday, January 04, 2008 - 8:59 pm: | 
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i have a cobra 142 gtl it powers up, but it tx on 26.295 on all channels, and if you keep it keyed up it will slowly rise up in frequency???????????????????
can anybody help?
mitchell
bluebird
cef 398
cvc 113
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Captian_radio
Intermediate Member
Username: Captian_radio
Post Number: 311
Registered: 9-2004
| | Posted on Friday, January 04, 2008 - 9:55 pm: |
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Sounds like the VCO needs an adjustment or a possible problem with the PLL or crystal or associated parts,sounds more like VCO problem though.
Bob CEF451/VE1CZ
Robert L. Spicer The days of radio are just beginning!
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Bluebird
Member
Username: Bluebird
Post Number: 75
Registered: 2-2004
| | Posted on Saturday, January 05, 2008 - 12:17 am: |
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thanks robert,,,i will try that,,just asked a friend and he thinks might be pll too.
pll was changed from 8737 to 8719
mitchell
bluebird
cef 398
cvc 113
|
Bluebird
Member
Username: Bluebird
Post Number: 76
Registered: 2-2004
| | Posted on Saturday, January 05, 2008 - 6:34 pm: |
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ok , i tryed a new pll chip,,same thing but now it tx on 27.315 on all channels,,is there anything else i can try without bringing it to a tech? techs are hard to find around here. THANKS
mitchell
bluebird
cef 398
cvc 113
|
Captian_radio
Intermediate Member
Username: Captian_radio
Post Number: 314
Registered: 9-2004
| | Posted on Sunday, January 06, 2008 - 8:53 am: |
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Still sounds like a bad VCO coil,try adjusting the coil and see if it helps if not try replacing it with another.I had the same thing happen with a Realistic and I found the VCO was bad.
Bob CEF451/VE1CZ
Robert L. Spicer The days of radio are just beginning!
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Bluebird
Member
Username: Bluebird
Post Number: 78
Registered: 2-2004
| | Posted on Sunday, January 06, 2008 - 9:37 pm: |
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do you rember where the vco is? is it L14?
mitchell
bluebird
cef 398
cvc 113
|
Bluebird
Member
Username: Bluebird
Post Number: 79
Registered: 2-2004
| | Posted on Sunday, January 06, 2008 - 9:41 pm: |
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come to think about it ,, I have a realstic {TRC 490}with the same board in my shack with the same problem....Hummmmmmmmmm
mitchell
bluebird
cef 398
cvc 113
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