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#1
October 5th 06, 05:07 PM
posted to rec.radio.amateur.equipment
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FT-757 transmitter bursting into osillation
Bought radio with blown final which I repalaced with same gain color
dot . You can key the transmitter on ssb as soon as you talk off it goes into never never land . tried changing the 1000 uf cap at the b+ input no help. I don't know what stage is talking off. the tools at hand are a 35 mhz scope and a freq counter and of course a dmm with cap checker. help jon b |
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#2
October 9th 06, 05:54 PM
posted to rec.radio.amateur.equipment
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FT-757 transmitter bursting into osillation
KA2JBY wrote: Bought radio with blown final which I repalaced with same gain color dot . You can key the transmitter on ssb as soon as you talk off it goes into never never land . tried changing the 1000 uf cap at the b+ input no help. I don't know what stage is talking off. the tools at hand are a 35 mhz scope and a freq counter and of course a dmm with cap checker. help jon b ,,,,,,,,,Jon, I have found that the most critical thing in these high power devices is the BIAS... Get the service manual and make sure the PA bias is correct .. could be the reason for original failure ...GL Harold |
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#3
October 12th 06, 06:18 AM
posted to rec.radio.amateur.equipment
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FT-757 transmitter bursting into osillation
Inductors in final stage all shielded from each other?
-- god bless http://www.Hello-Radio.Com http://home.xandros.com/products/home/home_edition.html |
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