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Content preview: Keying can be made sufficiently hard without generating clicks.
Instead of the old 5 msec rise time 'rule' make adjusts to the waveform so
that the edges are still rounded ... just not too much so. Listen locally
on a suitably attenuated receiver while making adjustments. [...]
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Subject: Re: LF: Soft keying...
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Keying can be made sufficiently hard without generating clicks. Instead of the old 5 msec rise time
'rule' make adjusts to the waveform so that the edges are still rounded ... just not too much so.
Listen locally on a suitably attenuated receiver while making adjustments.
Jay W1VD WD2XNS WE2XGR/2 WG2XRS/2
----- Original Message -----
From: "wolf_dl4yhf" <dl4yhf@freenet.de>
To: <rsgb_lf_group@blacksheep.org>
Sent: Sunday, September 29, 2013 5:40 AM
Subject: Re: LF: Soft keying...
> Pleasant to the ears of some maybe, and very annoying to the neighbours.
> Please, if you have the choice, do NOT use hard-keying whereever possible.
>
> 73,
> Wolf (who thought about returning to MF... up to now..)
>
> Am 28.09.2013 13:43, schrieb C. Groeger:
>> BTW, Stefan,
>> under difficult conds with low signal strength (which is the case on 630 m) hard keying greatly
>> enhances readability of your CW !
>>
>> And if you like QRQ, hard keyed CW is really essential for good copy!
>> You can check that easily on Hf, QRQ op's use hard keying...
>>
>> 73, df5qg
>>
>>
>> Christian Groeger
>>
>> Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de> schrieb:
>>
>>> Am 27.09.2013 20:51, schrieb Clemens Paul:
>>>> [...]
>>>> If you are seriously interested in generating a key click free CW signal,there's an
>>>> article about that
>>>> in QST 5/97 and 6/97 dealing with class E amps which would also apply to class D amps.
>>>>
>>>> 73
>>>> Clemens
>>>> DL4RAJ
>>> Yes.
>>> Or that one: http://www.classeradio.com/classh.htm
>>>
>>> I even built something similar some months ago. It is possible to adjust
>>> the power from 0...> 1 kW with a small potentiometer. Somehow
>>> fascinating. It was intended to send slow hell on the LF PA, not key
>>> click free CW. The project is maybe 90% finished but then other projects
>>> got priority. Image:
>>> https://dl.dropboxusercontent.com/u/19882028/LF/20130927_211117.jpg You
>>> can read the names of some ICs :-)
>>>
>>> BTW when will your MF PA be finished?
>>>
>>> 73, Stefan/DK7FC
>>>
>
>