From        :DK5YA @DB0GV.#HES.DEU.EU
To          :YAESU @WW
Date/time   :13-Jul 19:49
Message #   :817792
Title       :FT 847 Mods
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R:980713/1949z @:DB0GV.#HES.DEU.EU [Frank4t/Mtl OP:DF5FF] $:13782FDB0GV


de DK5YA @ DB0GV.#HES.DEU.EU   (Udo)
to YAESU @ WW

This is a summary of modifications from the FT 847 Home Page.
See: http://www.qsl.net/dk5ya then click hardware (in the upper frame), click
the FT 847 image, this will lead you to the FT 847 Home Page.

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Extending the transmit range

The modification posted earlier in this location was not working on most units.
 Here is a mod which appears to be correct:

Remove bottom cover..near battery there are 6 solder pads numbered 1 thru
6....pad 1 is already shorted with a chip resistor.....short pads 2 and 3 with
solder...check pad 6 and if it has a chip resistor on it ...remove it...this
one has to be removed tog


Thanks to Tom KF4TRZ, Brent K9WV, and others for sharing this information.

George Nelson WB7VWK     Email: WB7VWK.GEORGE@worldnet.att.net

I have just received the Technical Supplement (Service Manual) for the Yaesu
FT-847. This radio has an Alignment Menu in addition to a User Menu. To enter
this Alignment Menu, you turn off the transceiver, press the UP, DWN, and FAST
keys on the microphon

In the alignment procedure, each alignment parameter is selected by rotating the
SUB-TUNE dial. The alignment is performed by pressing the MCK/W key while
injecting a signal of the required frequency and level. Pressing the MENU key
after a setting is made stores the entry. To exit the alignment routine, press
POWER.
This radio seems to be very high tech in all. I have not entered the Alignment
Menu, and do not suggest that anyone do so, without the proper test gear and
electronic knowledge.


Dave Sublette K4TO - Help with a noisy fan

A common complaint about the FT-847 is that the fan noise is irritating (and it
is).  I have been able to quiet the whine using the following method:

Cut a 3" x 3" piece of soft packing foam that is about 2" thick. Be sure to use
the "open cell" type of foam.  You can tell that it is open cell type
construction by holding it up to your mouth and blowing air through it. Wedge
the piece of foam between t

dust from the air before it enters the radio.

Hope this works for you.


Bob Nagy, AB5N - Throttling back the audio output level


Although Yaesu did a fantastic job of gain distribution in the FT-847's
receiver, they bombed when it came to the last stage...the audio output. The
volume control's lowest setting results in room filling audio. The TDA200 audio
amp chip is not actually b


Take off the covers and turn the rig over on its top....exposing the bottom.
Near the rear, opposite side from the power input connector, you will easily be
able to locate the audio amp IC. It has 6 legs and is next to the purple 470mf
capacitor which it'


The 47K gives just enough level reduction that you will now set your volume
control at 11am instead of 10am, and the innitial lowest level point will be
about half what it was. You may find that 68K or 100K may still provide
acceptable volume levels.  The


Good Luck and 73's!

Bob Nagy  /  Chief Eng.  KVRX FM  /  KVR-TV9
Amateur Radio - AB5N    442.15/R    1292.3/R
email:  www.botany.utexas.edu/facstaff/stfpages/bnagy

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73 Udo, DK5YA