[Elecraft] K3 and sticking amp T/R relay

[Vic Goncharsky]

I never control linears from transceiver's PTT OUT. Once had this bad experience with Italian transistor VHF amp at UR7D contest station which we weren't able to control by open collector. The first DOT wasnt' there at all HI HI.  
Always using PTT control from the logging software TRLog, TR4W and properly chosen software TX delay.
No need for expensive sequencers HI.

 73 Vic US5WE/K1WE (UW5W in VHF contests) KN29AU 
UARL VHF committee 
Chairman, UARL Lvov Branch "LKK" 
Moderator, UARL VHF portal http://www.vhfdx.at.ua 
DXCC card checker in Ukraine




________________________________
 From: Brian Alsop <alsopb at nc.rr.com>
To: 
Cc: elecraft at mailman.qth.net 
Sent: Monday, October 29, 2012 8:21 PM
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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