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YAESU FT-857D TRANSCEIVER

TRANSISTOR SB1143 OVERHEATET and burnt out ???

how can that be prevented from doing that again

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  • 298 Answers

SOURCE: Transceiver signal interference

you have an oscillsocope to see the
signal imposed on the output signal.or
are you talking about sound(hum)
AC line interference is usually
power supply filter caps or
output filter caps or bad
ground (ground loop)
1 check grounds
2.check for bad antenna cable
3.check power & output amp filter capacitors

Posted on Dec 23, 2007

  • 1 Answer

SOURCE: yaesu Ft 2200 transceiver operators manual

Found a couple of ham radio sites that had manuals for sale or free downloads. Took several hours on net to find but it worked. had at lest 3 responses in 24 hr period of time.

thanks for yur help.

Posted on Mar 28, 2009

  • 16 Answers

SOURCE: AC line interference

I experienced very similar or the same problem with FT-840. When power is inceased over about 50 W, an AM on RF signal arises. Even when TCVR is supplied from accu and connected to dummy load. Period of interferencing signal is about 7.5 ms (130 Hz), so it cannot be hum from mains. I have not opened the PA block yet but i guess, it could be caused by damaged capacitor(s). Jiri

Posted on Dec 07, 2011

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Found a couple of ham radio sites that had manuals for sale or free downloads. Took several hours on net to find but it worked. had at lest 3 responses in 24 hr period of time.

thanks for yur help.

Mar 27, 2009 | Transceivers

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1 Answer

AC line interference


I experienced very similar or the same problem with FT-840. When power is inceased over about 50 W, an AM on RF signal arises. Even when TCVR is supplied from accu and connected to dummy load. Period of interferencing signal is about 7.5 ms (130 Hz), so it cannot be hum from mains. I have not opened the PA block yet but i guess, it could be caused by damaged capacitor(s). Jiri

Dec 23, 2007 | Transceivers

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