Kenwood ts680s
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VK4HMW
Kenwood ts680s
G'day all I have a TS680S that wont transmit on SSB but still receives and still outputs with a carrier at full power has anyboby struck this problem before and maybe able to help out what the problem could be ... Cheers Mark VK4HMW.
Re: Kenwood ts680s
I used to have a 680 many, many, years ago, when it was new.
ie; no apparent O/P with SSB, but full carrier on FM?
Can you key up full power on CW?
Is this based upon the internal meter only?
Have you verified this with a trusted external inline power meter?
Can you monitor your transmission with another receiver?
(I would TX into a dummy load during this testing phase.)
Does your FM transmission sound OK?
That means the mic itself, and early audio stages are ok.
Perhaps a balanced modulator issue?
Is it apparent on both sidebands, or one only?
No transmitted audio at all on FM?
Perhaps it could be something really simple, such as the mic itself, or the mic connector.
Can you try plugging in another mic?
Process of elimination, ol boy!
Mark, are you saying this fault condition is mode dependant?vk4hmw wrote:.. still outputs with a carrier at full power...
ie; no apparent O/P with SSB, but full carrier on FM?
Can you key up full power on CW?
Is this based upon the internal meter only?
Have you verified this with a trusted external inline power meter?
Can you monitor your transmission with another receiver?
(I would TX into a dummy load during this testing phase.)
Does your FM transmission sound OK?
That means the mic itself, and early audio stages are ok.
Perhaps a balanced modulator issue?
Is it apparent on both sidebands, or one only?
No transmitted audio at all on FM?
Perhaps it could be something really simple, such as the mic itself, or the mic connector.
Can you try plugging in another mic?
Process of elimination, ol boy!
Adam, Brisbane
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VK6KXW
Re: Kenwood ts680s
Mark I still have one and kept the operating and service manual from memory.
There was some mods out on it at the time that I did on mine and the paper work
is still in my files.
My unit due to old age; has a vco display fault, namely all dots come up on switch on and a
cw warning message.
I haven't fault finded it yet but suspect old caps or vco volts wandered off, its still a great
rig.
If I can help let us know.
Peter
vk6kxw
There was some mods out on it at the time that I did on mine and the paper work
is still in my files.
My unit due to old age; has a vco display fault, namely all dots come up on switch on and a
cw warning message.
I haven't fault finded it yet but suspect old caps or vco volts wandered off, its still a great
rig.
If I can help let us know.
Peter
vk6kxw
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VK4HMW
Re: Kenwood ts680s
Thanks Guys for your reply Its not a problem with the mic thats was the first thing I checked and it was outputting a full power on cw & am but I didn't check FM so I'm not sure Ive now given it to ex work mate who is a tech I'm sure he will sort it for me for a beer our to ....will keep you posted on what the problem was maybe able to help someone else some day , I yes its a great old rig Ive had it for about 10yrs now ...cheers MARK
....will keep you posted on what the problem was maybe able to help someone else some day , I yes its a great old rig Ive had it for about 10yrs now ...cheers MARK-
VK4HMW
Re: Kenwood ts680s
Sorry havent checked here for ages , but I did get fixed by a fella down in the Central coast NSW he said some transistor had gone so it wasnt to expensive , but would love to know what it was and I maybe able to do it myselfvk3pa wrote:send me a email can help had same problem vk3pa@vk3pa.com
thanks for your reply 73s Mark VK4HMW