[Yaesu] Fw: [CTDXCC] Antenna Tuner Problem??

John Wagner jwagner at dxengineering.com
Mon Sep 26 08:39:19 EDT 2005


I would suggest going to the Yahoo Groups and then the 920 group. There has
been a lot of discussion there about the tuner needing to be reset and the
low power issue. I'm sorry I don't have al link.
It's on my home PC. I will post it tomorrow if no one else does.

Good Luck

John

-----Original Message-----
From: yaesu-bounces at contesting.com [mailto:yaesu-bounces at contesting.com] On
Behalf Of Robert Pack (NX5M)
Sent: Saturday, September 24, 2005 11:27 PM
To: Yaesu at contesting.com
Subject: [Yaesu] Fw: [CTDXCC] Antenna Tuner Problem??


Perhaps someone on this reflector can help this fellow out.


----- Original Message ----- 
From: "N5IET Bob" <rtnmi at sbcglobal.net>
To: "Central Texas DX and Contest Club" <ctdxcc at kkn.net>
Sent: Saturday, September 24, 2005 10:02 PM
Subject: [CTDXCC] Antenna Tuner Problem??


I just bought a new (used) FT-920 S/N 980108C and it
receives beautifully but seems my SWR is better without
the Auto tuner inline.

I wish there was a way to make it forget any memorized
stuff that the previous owner might have put into it for
his specific setup. I have already checked the menus as
you will see later on and have soft erased and written
over the Q MEMS AND MEMORY BANK with new data.

At times with the tuner inline it acts like it is having a problem tuning
the antenna system to resonance. But either way (with or without an
indicated low SWR) I have low power output on all bands.

For some reason it tells me HIGH SWR but will eventually
tune the frequency if I play with it enough. Then at times
it seems to tune it and then JUMPS all the way to the
right.

I just had this same Antenna system hooked up to an IC-728
with the AT-160 AutoTuner and it would bring it into 1:1
almost immediately and full power output with no over
heating at 100% duty cycle on PSK.

With the new FT-920 setup it takes a while for it to bring
it into 1:1 if it even does.

But whether it does or not the power output is still low. 

MAX POWER OUTPUT I have out is 75W on 40 and 80. On 20 it
is about 50W and above 20 it deteriorates to 5W-10W. Do
not have an antenna for 6 Meters so I have not checked it
yet.

I have checked the menu and submenu and all is as default.
Here are the settings:
F01  1.15     CPU VERSION
F02  1.29     DSP VERSION
FO3  Fin1.26  Tuner Version
FO4  OFF      TUNER CLEAR
FO5  OFF      TUBER PLATE ADJUSTMENT
FO6  OFF      TUNER WRITE TO TUNERS MEMORY
FO7  OFF      TUNER MOVEMENT TO CENTER

S/N 980108C

Any help would be appreciated


 73 fer nw,
Bob N5IET

(old calls KE5CTY - WB5ZQU - WY5L)
10X# 37210, FP#-1141, SMIRK#-5177
http://www.qsl.net/ke5cty/
Code may be taking a back seat for now,
but the pioneering spirit that put the code
there in the first place is out front of it all.


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