[Amps] Vox ssb, time for RF to appear ?

[Bob Wilson, N6TV]

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 at 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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