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Re: [Amps] QSK between TS590 and LK550 - was Re: LK550 ALO/Meter board

To: wb0gaz@yahoo.com
Subject: Re: [Amps] QSK between TS590 and LK550 - was Re: LK550 ALO/Meter board interconnect - anyone know...
From: "hzp_electronics@juno.com" <hzp_electronics@juno.com>
Date: Fri, 10 Nov 2023 23:30:43 GMT
List-post: <mailto:amps@contesting.com>
Hi Dave,  
I have the TS-590SG.  It does not have a keying loop for QSK.  TenTec is the 
only rig that I am aware of that supports the keying loop. TS-590 TX Delay is 
fixed at 10ms according to the manual.
   73
.... Bill K3HZP


---------- Original Message ----------
From: wb0gaz via Amps <amps@contesting.com>
To: amps@contesting.com
Cc: wb0gaz@yahoo.com
Subject: Re: [Amps] QSK between TS590 and LK550 - was Re: LK550 ALO/Meter board 
interconnect - anyone know...
Date: Fri, 10 Nov 2023 20:04:17 +0000 (UTC)

 My work with a friend's LK550 is making forward progress (quick catch-up - the 
amplifier has had a history of faults and repair attempts that converge back on 
ALO/Meter board - now disabled - and QSK board.)

ALO/Meter board has now been de-powered (disconnect 12V from XMT/STBY switch to 
J1 DC input pin), taking the "overload" aspects of the ALO/Meter board out of 
operation, just leaving the basic passive meter scaling and protection 
components in service. The result is that a spurious short circuit (12V rail to 
ground, occurring in the ALO/Meter board) has been worked around (not concerned 
about the "ALO" functions of the board -it's a mess and appears it would serve 
no value at this stage). Now getting 12V when amplifier is enabled (via orange 
wire from ALO/Meter J2 to contact 7 on QSK board) as originally intended. This 
is forward progress and advice contributions over the last few weeks here have 
been invaluable.

Next step is to begin testing QSK operation (between TS590 and LK550.)

URL of the operator's manual I'm using to explore QSK integration at end of 
this post.

New question is this - does the TS590 support keying loop (so that the LK550's 
KEY OUT connector would inhibit the TS590 generation of transmit RF while the 
amplifier is doing it's short delay after getting KEY IN signal)? KEY IN loops 
out to KEY OUT with a time delay imposed by a NE555 on the LK550 QSK board. 
Should I try to interface the TS590 to the LK550 using KEY IN and KEY OUT, or 
should I use open-loop control (TS590 RL signal from Remote connector to LK550 
RELAY input? The QSK board appears to buffer transmit enable from the 
transceiver (so the TS590's 12V 10mA limitation of it's transmit enable output 
should not be a problem), however, it's not clear if/how I should use KEY OUT 
to inhibit TS590?

Thanks again for the ongoing help as I/we work on resuscitating the LK550...

Dave WB0GAZ

https://manual.kenwood.com/en_contents/attachDownload/95191


  
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