Hi Dick,
Thanks very much for the reply. As I said, I was checking out a rumor,
and am very glad to know that there appears to be no foundation. One
less thing for me to worry about in my preparations. I will have to
check to see if TRlog will allow the character tailoring you suggest
to deal with the "lightening" issue.
Again, thanks very much.
cheers, Paul - VE7CQK - email: paule@sfu.ca
>
> Hi Paul...
>
> IF a first-character-clipping problem as you describe below exists with the
> ALPHA 86 itself, it's something I've never heard of in the ~13 years since
> ETO/ALPHA introduced that amp.
>
> The 86-87-89 PIN diode T/R-QSK systems generally are so much faster than that
> of popular transceivers' QSK systems that the amps are transparent in terms
> of keying/timing.
>
> I've used ALPHA 86, 87A and 89 amps (all having similar PIN T/R-QSK systems)
> with a variety of common transceivers including particularly TS-940, 950S, &
> 950SDx, and FT-1000D, and unless I'm mistaken, all first-dit-shortening
> observed in full CW QSK operation has been easily traceable to the
> transceivers.
>
> My experience is that each of these xcvrs' full QSK mode shortens ALL
> characters enough to make the output CW signal "lighter" than what comes from
> the keyer output.. not noticeable at 5-15 wpm, but VERY noticeable at 30-50
> wpm. Best solution I found was to use an external "LogiKey" keyer, which can
> be easily programmed (from the paddle) to add any desired number of
> milliseconds duration to each dit and dah. In some cases it could be that the
> first dit of a transmission isn't fully compensated by this approach, but
> I've found it fully satisfactory. Of course it doesn't fix clipping of the
> first syllable of an SSB/voice transmission due to slow transceiver VOX T/R
> transition to "T."
>
> OTOH, if anyone on the reflector has demonstrable first-hand knowledge of
> initial character clipping by any ALPHA QSK amp (especially if it's
> significant enough to be actually noticeable and bothersome in normal
> operation) we'd definitely like to know the specifics.
>
> 73, Dick W0ID
>
>
> -----Original Message-----
> From: Paul Erickson [SMTP:paule@sfu.ca]
> Sent: Thursday, December 02, 1999 9:20 AM
> To: Amps reflector
> Subject: [AMPS] Alpha 86 qsk question
>
>
> In preparation for the IARU next year, the station I will be using
> has an Alpha 86. I had heard that there may be an issue with this
> amp in qsk mode regarding clipping the first character. Anyone
> familiar with this amp know if it is true, and if so, what is the
> most elegant way of dealing with it?
>
> cheers, Paul - VE7CQK - email: paule@sfu.ca
>
> --
> FAQ on WWW: http://www.contesting.com/ampsfaq.html
> Submissions: amps@contesting.com
> Administrative requests: amps-REQUEST@contesting.com
> Problems: owner-amps@contesting.com
> Search: http://www.contesting.com/km9p/search.htm
>
>
--
FAQ on WWW: http://www.contesting.com/ampsfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|