The lk amps don't require any special qsk loop to operate. The key goes
into the Amp and the Amp qsk board does the sequencing and then the Amp
keys the TX as the final step.
This is described in the lk manual interconnect diagrams.
As long as there is a qsk option in the lk.
The small cube relays on the qsk boards are pretty robust but are
inexpensive and easy to replace. With a scope you can monitor the lk key
in line to key out line delay.
We routinely operate with semi break in for all our cw multi multi stations
including the lk and alphas. 10ms delay from the TX is ok up to about 25
wpm for us and we choose not to use the qsk option at all. Switching to
ptt and relay operation in the lk makes it work just like a non qsk Amp but
the only difference is where step one signal comes from in the sequence.
Curt
KU8L
On Fri, Nov 10, 2023, 9:39 PM wb0gaz via Amps <amps@contesting.com> wrote:
>
> Thanks very much, Bill - I wasn't sure as I've never worked with the 590
> before.
>
> Dave
>
> On Friday, November 10, 2023 at 04:32:03 PM MST,
> hzp_electronics@juno.com <hzp_electronics@juno.com> wrote:
>
> 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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