Using a scope on a Elecraft K3 with KSYN3A upgrade, K3 in SSB mode + VOX,
I measured a 30 ms delay between KEY OUT (amp relay) going to ground and
the first RF output from the transceiver. That's significantly longer than
CW mode + VOX (about 6 ms TX delay with *CONFIG:TX DLY nor 008*, about 4.3
ms in CW QRQ mode, with or without QSK enabled). There is a jitter in the
delay. It varies +/- 1 ms (approx.).
I haven't done this measurement on any other radios.
73,
Bob, N6TV
On Sun, Oct 28, 2018 at 5:52 AM Jim Thomson <jim.thom@telus.net> wrote:
> RE: TR relay timing, hot switching etc. What is typ time, between
> talking into mic on SSB VOX,
> and when RF 1st starts to even appear at the output of the typ xcvr
> ?? On my yaesu MK-V, on CW
> mode only, I can vary the delay between internal keyer.... and RF
> appearing at the output of xcvr,
> by anywhere from 0-30 msecs.... in 1 msec increments. That adjustment
> allows for precise external
> amp TR relays to get a ..head start... depending on how fast the TR
> relays are in the external amp. IE:
> will allow for vox cw, when using slow open frame relays..... or sped
> up, faster vac relays, or pin diodes
> etc, when using qsk cw.
>
> I see no adjustment for plane VOX SSB. Is this a concern..esp with
> slower TR relays in an external amp ?
> I can add additional delay via the... TX inhibit lead, if required.
> But IF the xcvrs natural delay is say 7 msecs,
> inserting 7 msecs delay into the TX INHIBIT lead will buy me..nothing.
> Any added TX inhibit delay would have
> to be longer than what is in the xcvr. IE: xcvr is say 7 msecs,
> between coughing into mic on vox ssb, and TX inhibit
> delay set to say 15 msecs..or longer..to match the slow TR relays in an
> external amp.
>
> I dont see any delay specs on typ xcvrs.... when used on vox ssb. And
> I dont mean between coughing into mic...
> and full pep output. I mean between coughing into mic....and just a
> few watts pep appearing at output of xcvr.
>
> Jim VE7RF
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