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

[Bob Wilson, N6TV]

Good data by W0QE, thanks, but VE7RF's original question was about SSB
using VOX, and these measurements were all made using CW.

Also, I don't really understand how the HSEND pin on the Icom ACC connector
can be both an input (like PTT IN?) and an output (like KEY OUT)?  I should
probably direct this question on one of the Icom reflectors.

73,
Bob, N6TV

On Wed, Oct 31, 2018 at 7:06 AM Jim <jimw7ry at gmail.com> wrote:

> Some various radio measurements here:
>
> http://www.w0qe.com/amplifier_timing.html
>
> Notice that the Ic706 and others actually unkey the relay (H-send line)
> before the tranciever stops sending RF.
>
>
> 73
>
> Jim W7RY
>
>
> On 10/28/2018 7:06 PM, Bob Wilson, N6TV wrote:
> > 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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