Pagina 4
KB2LJJ Radio Mods Database and Manuals
03/05/2008 08.24.31
http://www.kb2ljj.com/data/yaesu/ft-817.htm
I tried the extended TX modification using the blue numbers in the photo ie : where jumper 1 is at the
left, and it worked. I found, tho, that you have to hold down the F and V/M buttons together whilst
powering up the FT-817 for the changes to take effect.
Subject:
The BLUE numbers are correct User comments
I tried the extended TX modification using the blue numbers in the photo, where jumper 1 is at the left
it works. Reset CPU: hold down the F and V/M buttons together whilst powering up the FT-817 for the
changes to take effect. 73 Igor OM3CUG
Subject:
Extended TX User comments
Well after doing the mod & soldering the pos 1,2,3,4 and resetting the unit my ARS function
disappeared?
Have any one else noticed this.
greetings Lars
Subject:
Verifed Jumper IDs user comments
I rang out the jumpers to the foil traces on my FT-817 and found that the red numbers of the photo
above agree with the schematic included with my radio. J4001 ~ J4009 follow the numbering in red
from 1 ~ 9. This then changes the four (left hand) jumper IDs to 6 ~ 9 (J4006 ~ J4009) that should be
shorted in order to open the transmit range of this rig.
My radio was a type BY3 (purchased in Singapore Feb. 2002). When I opened it up, jumper five
(J4005) was not soldered but position 6&8 (J4006 & J4008)were. I soldered position 7&9 (J4007 &
J4009)and checked out the rig. This mod opened up the transmit capability just as the posted mods
above stated. No negative results were noted.
This modification worked on my rig, I take no credit or blame for your results.
Subject:
817 BLUE number mod User comments
Use the BLUE numbers on the US version of the 817 for increased transmit. That is what worked for
me.
Subject:
Jumper Numbers User comments
I have modified the 817 for UK 5MHz operation and have found that the RED set of numbers is
correct. This also agrees with Yaesu's own US modification sheet. For full coverage, bridge J4007, 8
and 9. If you also bridge J4006 the coverage remains the same. My 817 is a US Version and was
originally bridged 5,6 and 7.
Full TX coverage is:
1.8 - 33 Mhz
33 - 56 MHz
140 - 154 MHz
420 - 470 MHz
Subject:
frequency expansion User comments
I posted my workings on the frequency expansion in the yahoo.group FT817 reflector and received
many enquiries. Perhaps, I would like to repeat here on what I did:
1.I follow the RED numbers in the previous messages;
