Hi Don
I had a 570 I bought new back in '98. I remember in the box, it said not to
use the auto tuner for anything over a 3:1 SWR. So, I assume the internal
tuner is a weak link in the 570. I never did have mine on Rtty because back
then, I was parked on 14.103 with a group on hf packet. The antenna I was
using (still am) was a Hy-Gain TH3 3el tribander and the swr on 14.103 was
only 1.5:1. I sold it to one of the locals here when my adjustable mortgage
adjusted way up, and I needed the money for refinancing. He has had it since
then, and sent it in for the G upgrade. I take care of the local for sale
list and see he has it up for sale. I'm pretty sure he uses it on ssb only.
73, Mike K9MI
----- Original Message -----
From: "druokonen" <druokonen@hotmail.com>
To: <rtty@contesting.com>
Sent: Wednesday, January 31, 2007 11 11
Subject: [RTTY] RTTY/Power Kenwood TS-570
> The previous question regarding an Icom rig and runing 100 watts on RTTY
> brings up my problem. I am runing FSK RTTY with my Kenwood TS-570Sg and
> twice I have burned out components in its internal auto antenna tuner. The
> manual with the Kenwood states that the unit is cable of runing 100 watts
> RTTY. My repairman states not to run more than 30-40 watts with this unit!
> I am currenlt runing 35 watts. My antenna is a 20' Force 12 flagpole
> (basically a vertical) fed with RG8U and tunes easily on 20 meters with
> the auto tuner. My Yaesu FT-1000MP Mark V Field also with auto tuner tunes
> this antenna easily as well. I realize that RTTY is a continuous duty mode
> but it seems that if the rig's rf amplifier circuit can handle 1oo watts
> RTTY that the self contained auto tuner should as well? I would appreciate
> comments and wondering if others using this rig have experienced similar
> problems? Don K3PRN
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>
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