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From: Charlie Mazoch <"CharlieM"
Subject: FT-847



Mod to install xtalfilter:

 An International Radio xtal filter 2.1Khz wide, 455Khz  filter will fit

into this radio. The top of it can be stuck to the diecast housing  on

left front of radio looking at the bottom of radio with front facing

forward. I used double sided tape to mount it to the chassis between the

circuit board and chassis.

The pins of filter are facing back and to the top. A couple of short

runs of minature coax and connectors and the ceramic filter on receive

can be replaced. There was a lot of difference using the xtal filter in

place of the original ceramic against strong signals close to the

receive frequency. Model # of filter is #702.





Charlie Mazoch Jr.   WA5KVS

2139 Vinita Street

Houston, Texas  77034

charliem






YAESU FT-847 ALL MODE HF/VHF/UHF TRANSCEIVER



 WARNING! Any modifications made to your equipment are performed at

 your own risk.  Be aware that these mods will probably void your

warranty.



 A modification to open up the radio.



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 to go out of band on hf and

6m.....replace cover and turn on radio while holding in the lock and

fast buttons....this resets micro-processor and you will also lose all

your memories that you have entered...you will have to reprogram

these....TX coverage will be 1.8-76mhz with no gaps...DO NOT TX BETWEEN

30-36MHZ -- not only is it illegal, but you may damage the HF PA.



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

information.



------------------------------------------------------------



Sirs,



Attached is a text file containing instructions on how to enable the

Yeasu model FT-847 to transmit out of band. I believe this will be of

interest to your readers. Please post this file on your site under

"RADIO MODS." The following text shows the exact contents of the

attached file. Thank you, Jeff Parker KF4SCI



Yeasu FT-847 Out Of Band Modifications



WARNING! There are apparently different versions of the FT-847, as such

some may not modify. Modifications made could void your warranty.

Perform any modification at your own risk. The author assumes no

responsibility whatsoever from the use or misuse of this information.

Please verify and obey local regulations prior to transmitting outside

your license allocations. © 5 JAN 00 KF4SCI



Once modified the Frequency coverage of the FT-847 in TX mode is: 1.8

MHz to 76 MHz (no gaps) CAUTION:DO NOT TRANSMIT IN THE RANGE 32 MHz TO

37 MHz AS YOU ARE TRANSMITTING INTO A LOW PASS FILTER AND COULD DO

DAMAGE TO THE POWER AMPLIFIER.  137 MHz to 174 MHz and 410 MHz to 470

MHz



The modifications are as follows ...

Remove bottom cover you should see the backup battery, on the left side

their are 6 solder pads numbered 1,2,3,4,5,6. Pad number one should

already have a 0 ohm chip resistor across it, short pads 2 and 3 with 0

ohm chip resistors, small wire, or a simple solder bridge.  Verify that

pad 6 has no chip resistor on it. If indeed it does, remove it.  The

radio will not transmit out of band on HF or 6 meters if this

resistor/jumper is left intact.  Replace the cover, make all necessary

connections such as power, antenna etc.  Now press the fast and lock

buttons simultaneously while powering up the radio. This will reset the

microprocessor resulting in the loss of any memory presets.  Your

modification is complete. RF power output should be the normal 100

watts through the six meter band however, output power may diminish to

as low as 20 watts as you reach 70 MHz and beyond. This is normal as no

cause for panic.



137 MHz to 174 MHz and 410 to 470 MHz ranges should produce a

respectable output power of 50 watts.





----------------------------------------------------------------------------



Yaesu 847  FC 20 tuner fix



The fix is on in one of the menus in the Yaesu 847

After this mod the 847 will tune up to a 7:1 insted of 3:1





The first thing you need to do is get into the service menu. You do this by

holding down the three buttons on the mic and turning on the radio. The

first menu will be Fm-51 do not change that one. Rotate the sub-tune knob

until you see the menu that says SWR 3.0 to the left this you will see two

small numbers or numbers letter combination. Rotate the MEM/VFO CH knob

until you see 9A then push the menu button and you are done.

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