[RTTY] RTTY/Power Kenwood TS-570

[Mike Brown]

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 at hotmail.com>
To: <rtty at 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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