[Elecraft] Default K3 transmit delay may be too short for slow QRO amplifiers

[Wayne Burdick]

Also, a reminder: this is nothing new. We’re just clarifying a delay offset that has existed for a long time. There have been no recent firmware changes.

It would be possible to modify the K3’s keying algorithm to allow for much longer delays (say, 0 to 200 ms). Of course this would significantly shift CW RF output in time relative to keying input. 

Fortunately, very few amplifiers require more that a few ms of extra delay. 

73,
Wayne 
N6KR


----
http://www.elecraft.com

> On Jun 8, 2018, at 7:33 AM, Wayne Burdick <n6kr at elecraft.com> wrote:
> 
> The delay can be set from 8-20 ms at present. Given the small time offset, this is actually 5-17 ms (approx). Use small values if possible. 
> 
> With external keying, you can generally compensate by reducing the device’s weighting. 
> 
> Wayne 
> 
> ----
> http://www.elecraft.com
> 
>> On Jun 8, 2018, at 5:02 AM, "john at kk9a.com" <john at kk9a.com> wrote:
>> 
>> I agree that 5ms is too fast for many amplifiers. Is computer sent CW also
>> spoiled when increasing the delay?  Does it only effect QSK or all
>> transmissions?
>> 
>> John KK9A
>> 
>> Igor Sokolov ua9cdc wrote:
>> 
>> Wayne it is a pity that TX delay setting affects CW timing. Changing TX
>> delay from default even one or two steps makes CW much worth. Can you
>> figure out a way to make CW timing independent from TX delay? With 5 ms
>> TX delay working in many contests I already had to change a pair of
>> relays in the amplifier. 10-12 ms would be fine for me. 20 ms will
>> probably suit the majority of users. But 5 ms is way too fast and
>> unfortunately cannot be altered without spoiling CW sending. I know that
>> I could build external sequencer but this does not look neat enough
>> especially for portable field operation. Every other radio I had allowed
>> TX delay adjustment to at least 20 ms.
>> 
>> 73, Igor UA9CDC
>> 
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft at mailman.qth.net
>> 
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to n6kr at elecraft.com