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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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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

  • 18 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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Yaesu 857D very poor audio out on SSB.


Dbl check your swr in am mode.. Ch your ssb power and mic gain default is 50 on both on hf .. If you use the mh-59 you will need to reduce the mic gain to 35 and it needs to be set for remote mic in the menu. Also the ssb needs to be set 2.5k wide with the ssb carrier zeroed both tx and rx

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VHF/UHF RF Power falls to Zero when the Auto ATU tunr logo is on the display. When the tunr logo is off the VHF/UHF RF power is only 10 watts on 2M and 3 watts on 70cms. The Yaesu FT 857 D should have no...


Check for open or shorted Veractor diodes and steering diodes there may be no direct interaction as you say but if a diode is open or shorted the RF circuits might still be selected for the higher bands and the lower output power on your vhf/uhf is an indication of this.
If you do not have a service manual you can get one hear, you will likely kneed one
http://www.tradebit.com/filedetail.php/127575994-vertex-yaesu-ft-857-ft-857d-2005-service-repair
Good Luck Best regarsds Falco

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Hi,

Not enough info supplied, the more info you supply, the easier for us to assist you, CPU dead, does not tell us enough.

Cheers,
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Yaesu FT-857D transceiver


Nice rig, what's the question?

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What's your problem?yaesu 857d service manuel


Hi,

Yaesu 857D service manual, right?

Are you looking for a downloadable copy or making one available?

If you are looking for a downloadable copy, say so, otherwise as you can tell, we're just guessing, which doesn't help anyone.

If you're making one available for other to download, then I would like to buy you a drink, because this would be so appreciated by yours truly and others with that same said model.

So, which one of the above is it, let us know and we'll respond ASAP.

Cheers,
Peter

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