[Elecraft] K3 and sticking amp T/R relay

[Igor Sokolov]

Brian,
Yes, it uses inhibit feature of K3. No delay on return to RX.
I always use PTT foot switch or  computer PTT (which has programmable delay) 
so no issues with chopping part of CW character.

73, Igor UA9CDC


----- Original Message ----- 
From: "Brian Alsop" <alsopb at nc.rr.com>
Cc: <elecraft at mailman.qth.net>
Sent: Tuesday, October 30, 2012 2:21 AM
Subject: Re: [Elecraft] K3 and sticking amp T/R relay


> Igor,
>
> Just what does this delay?
>
> Does it inhibit RF output from the K3 for 30 ms?  If so it may chop
> parts of CW characters.
>
> The formula T=1200/W gives the dot length for a given WPM (W)
> At 40 wpm, one dot is 30 ms.
>
> Does it delay return to RX?
>
> 73 de Brian/K3KO
>
> n 10/29/2012 19:54, Igor Sokolov wrote:
>> I had similar problem.
>> The solution I use is the external TX delay circuit of 30 ms
>> (adjustable) that utilizes 1 FET transistor, capacitor and couple of
>> resistors. It is built into  connector body and plugs into ACC socket of
>> K3. Now my T/R relays in the amp are safe.
>>
>> 73, Igor UA9CDC
>>
>> ----- Original Message ----- From: "briana" <alsopb at nc.rr.com>
>> To: <elecraft at mailman.qth.net>
>> Sent: Monday, October 29, 2012 4:01 AM
>> Subject: Re: [Elecraft] K3 and sticking amp T/R relay
>>
>>
>>> Do this at the risk of QSD CW.  Higher settings (>10ms) cause this.
>>> The bad keying is independent of internal or external keyer.
>>>
>>> It is a bug that has never been fixed in the K3.
>>>
>>> 73 de Brian/K3KO
>>>
>>>
>>> On 10/28/2012 3:23 PM, Don Wilhelm wrote:
>>>> Gary,
>>>>
>>>> The config menu TX DLY parameter will change the time from keydown to
>>>> the onset of RF.
>>>>
>>>> 73,
>>>> Don W3FPR
>>>>
>>>> On 10/28/2012 4:09 PM, Gary Smith wrote:
>>>>
>>>>> My question for here is; if the amp is not properly sequencing with
>>>>> the K3, what setting can I change within the K3 to provide more time
>>>>> for the amp's relays to close before the K3 transmits? I remember
>>>>> there was a feature to allow ms changes for QSK in the K3. How do I
>>>>> find that option? And should I decrease the MS time in the K3 or
>>>>> increase it to let the perhaps relay in the amp have time to close
>>>>> first to avoid hot switching?
>>>>>
>>>>>
>>>>>
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