| Author |
Message |
    
20mg355
Junior Member
Username: 20mg355
Post Number: 19
Registered: 6-2004
| | Posted on Thursday, April 13, 2006 - 3:41 am: | 
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Hello folks
got my self a used Magnum S9. Everything works great except one thing and thats the FM mode.
After some time talking the FM power dropps from 40watts to 10watts and rigth down to zero and then just jumps between 10 and zero watts out.
then I release the ptt. and this thing starts over again, it does not matter if the SWR cirucit on the back og the radio is on or off. my antenna is clean for swr, also checked this via a dummyload with the same result.
Yours Sincerly
Tom
Of topic
PS sorry for my delay with the chat Lon. only recent got home from a work project in another city :-) Will be home 3 weeks now :-) |
Vanillagorilla
Advanced Member
Username: Vanillagorilla
Post Number: 525
Registered: 4-2005
| | Posted on Thursday, April 13, 2006 - 8:01 am: |
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Only thing I can think of would be the high duty cycle on FM. Perhaps talking with the VR power around 10-15w would stop it from overheating?
Didn't think you could turn the VR high enough for 40w FM power?
Just an idea...good luck!
Hank CEF559 |
20mg355
Junior Member
Username: 20mg355
Post Number: 20
Registered: 6-2004
| | Posted on Thursday, April 13, 2006 - 9:13 am: |
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Hello Hank
The FM output is fixed to 40 watts can`t change it with the pwr knob.and I cant find any VR pot for FM,the only mode the pwr knob works on is AM.and the only way to reduce output on ssb is using the mic gain.
Tom |
20mg355
Junior Member
Username: 20mg355
Post Number: 21
Registered: 6-2004
| | Posted on Thursday, April 13, 2006 - 9:42 am: |
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hello again
seems that AM and SSB also is effected by this, but in these modes AM dropps from about 9 Watts to 2.5 watts an stays there(not jumping up and down) on ssb from 40watt to 12watts, this happends when the S9 has been on for a while 10-15 minutes or so.
Tom |
Wankle
Junior Member
Username: Wankle
Post Number: 19
Registered: 5-2003
| | Posted on Thursday, April 13, 2006 - 5:18 pm: |
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sounds like one of your finals is intermittant.
call Sam at RF Limited and he will fix you up. |
Yankee
Senior Member
Username: Yankee
Post Number: 1137
Registered: 7-2003
| | Posted on Thursday, April 13, 2006 - 5:21 pm: |
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Not a radio technician by any means, but sounds like the final output circuit is running hot or has a voltage regulator breaking down, even possible the pre driver, driver or final transistors are weak. the cause of running into a high SWR before you got the radio. Sounds like it might have to make a trip to Sam Lewis. The radio can't be all that old. I don't believe the warranty is transferable. On the other hand I would not trust just anyone to work on a radio the likes of an S-9.
Just my thoughts and 2 cents worth. |
20mg355
Junior Member
Username: 20mg355
Post Number: 22
Registered: 6-2004
| | Posted on Thursday, April 13, 2006 - 7:18 pm: |
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thanks alot for your input guys. I live in norway,so i can probaly buy a new unit for the fee I have to pay for sending it to the US :-)
I will try to find a tech here in norway.
again thanks alot
Tom |
20mg355
Junior Member
Username: 20mg355
Post Number: 23
Registered: 6-2004
| | Posted on Saturday, June 03, 2006 - 1:42 am: |
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Hello friends
Just an update about my S9 :-) , Replaced voltage regulator and both finals, did the "remove diode mod" and all works 110 % , Thanks alot for all your help guys.
Tom |
