[Kenwood] TS-870S Linear relay rating

Sat Nov 13 16:57:26 EST 2004

Al this question comes up all the time.
1. The relay in the TS-870 will work with the TL-922A without any 
problem as far as the rating. What I found is that the TS-870/TS-850 
start sending RF before the relay in the TL-922A is closed. This 
causing what is called 'hot-switching' and for just a second there is 
high SWR coming back on the rig until the amp relay close.
2. Many guys use some kind of interface to buffer the keying to the 
amp. This solves the problem.
3. On my website I have a nice artcle on the problem and any EASY to 
make interface using one transistor, with detail photos. I am using a 
Kenwood TS-850S with a Drake L-7 amp.
Please take a look at:
http://www.qsl.net/k0bx I hope QSL.net is up and working.
Then look for amp keying.
Hope this helps.
Joe K0BX
Alan Wolke wrote:
> Does anyone know the voltage/current relay contact rating for the
> linear-keying relay that is available at the REMOTE jack on the
> TS-870S? Just wondering if it can directly key a TL-922A (100VDC,
> 40mA).
>> 73 and Thanks,
> Alan
>> --
> Alan Wolke, W2AEW
> "i usta cuDn't speL enjinere, noW i ar wuN"
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