[AMPS] QSK5 Unit

[measures]

>
>>I think the speed you need depends on whether you can get a good early
>>'transmit' signal from your exciter
>
>As an alternative, I presently use a CMOS II keyer with an "auxiliary"
>open-collector transistor to ensure that the amp is keyed fractionally ahead
>of the transceiver.  The primary keyer output connects to the transceiver
>key jack in a bussed arrangement to all my transceivers.  Then, the
>auxiliary open collector is run in parallel with the transceiver's external
>amp relay or open-collector.  In effect, I have a key bus of open-collector
>outputs that run into all my amps.  With the bussing technique, I do not
>need to worry about switching or directing the control of my amps; it's all
>automatic and transparent to me and hot-switching is avoided at all keying
>speeds.  The keyer's auxiliary output ensures that the amp "makes" fast
>enough, then the transceiver's own amp key line ensures that the "break" is
>adequately long to avoid hot-switching on waveform's trailing edge.
>
€  A break delay necessarily subtracts from the next make.  QSK has way 
more gotchas than it looks.  An o'scope is indispensable.  

cheers, Paul

-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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