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

[Jim]

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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