Pagina 42
KB2LJJ Radio Mods Database and Manuals
03/05/2008 08.24.31
http://www.kb2ljj.com/data/yaesu/ft-817.htm
Click here to get the BMP file of the PCB 13 Kb.
For an exact print of the PCB you should use this PDF file of the PCB.
Software for using the CAT interface can you find on this links:
Direct download the FT-817 Commander (HB9DRV).
This article can also be found at http://www.pi4frg.cjb.net/schema1.
Yaesu FT-817 Mod/Fix
Author: Tom
I am posting the following as a service to all 817 owners. Even if you do not experience these 70cm
transmit problems, I would not be surprised to find out that this fix also improves receive by making the
radio quite a bit more quiet---here is my story
Recently I found that my 817 occasionally did not put out any power on 440 transmit when using a duck
on the front BNC.
Further examination showed that when set to low power and the antenna was flexed just so the power
meter would peak but actual output power disappeared.
Some experimentation showed that grounding the big covered can on the main board solved the problem.
A bit more investigating showed the bottom of the main board is not well grounded.
A little search work produced the official Yaesu fix document (the actual document used at Yaesu) along
with part numbers needed to implement the fix (available from Yaesu, or you can send the rig to them
and wait for them to repair it). Yaesu will fix the rig for free if it is under warrantee. If not you will have
to order the fix part (the part# is in the attached tiff file), don't worry it only costs .22 USD (22 US cents).
