Pagina 9
KB2LJJ Radio Mods Database and Manuals
03/05/2008 08.24.31
http://www.kb2ljj.com/data/yaesu/ft-817.htm
74;DCS;FM;Modulation;129;
75;LSB-CP;SSB;Carrier Point;-19;
76;USB-CP;SSB;Carrier Point;-20;
Proceed at your own risk.
73 from ron, dl5gbl
Subject:
Voltage alignment successfull !!! User comments
My 817 showed 15V @ the Input Voltage of 13,6 V. So i pushed the 3 Buttons while powering up. At
Menu Number 17 I chose 136 and Voila, 13,6 V is displayed @ 13,6 V !!! Thank you for this detailed
Service Menu Overview.
Improvement of the ALC - better modulation and throughput
Author: Andreas Duessler
Hi ladies and gents,
The FT-817 is a lovely rig, isn´t it? This is a radio one must have - without special reasons. But
anyway, when I got the radio one week ago, I started to test it against exciting others. (like TS-870).
Everything was quite okay, but the output in SSB is not reaching the 5W-mark, even when the CW-
tone and in FM the rig runs on specified power. I walked through the circuit-diagram and found the
reason. The capacitor C1113 on the main board is too small. This has to be changed to bigger values.
In my case it´s now 470 uF instead of former 1uF.
To find the place inside the rig .... boy! This took some time. But after locating the place, it´s now
easy to describe:
Open the upper side (where the loudspeaker fits) and locate the red jack on the rear side. Inside a flat
band-cable comes up and is connected. Right beside this cable you find C1113, but it´s not labeled.
But anyhow, look for the pictures taken and I´m sure you find the place. The new C is visible in the
lower right corner of the picture (big and black) I removed the original C from the board before - but
it´s still not necessary.
After finalizing, close the rig and test the output in SSB in comparison to FM and CW. The
throughput is now there. And believe me, you get better voice reports. And running qrp - it´s
sometimes the needed peace of junk !
