[Elecraft] K3 transmit/amplifier relay

[Scott Ellington]

In all fairness, I now see why the K3 behaves as it does, and that it's not a simple firmware mod to fix it.  KEY_OUT is derived from 7R, which switches all sorts of stuff between RX and TX mode.  If 7R were disabled in PTT RX mode, probably even the sidetone wouldn't work.  I don't even see a spare pin on the MCU chip that could be used to gate KEY_OUT. 

End of discussion, I think.

73,

Scott  K9MA
On Mar 11, 2011, at 3:26 PM, Scott Ellington wrote:

> Not necessarily.  The PTT Out line may control more than just the internal amplifier relays.  For example, if one uses a separate receiving antenna, there should be a relay which disconnects it from the receiver on transmit.  The amplifier output may also be switched by an external relay.  There might even be a relay which terminates a shunt fed tower on receive, so it doesn't re-radiate into the rx antennas.  So, there could be 3 relays switching. Even if they're quiet ones, I'd rather they didn't in PTT rx mode.  
> 
> Perhaps there is a situation where it is desirable to do what the K3 does, though it escapes me.  In any case, it would be nice to have the option of turning it off in PTT mode.
> 
> Scott  K9MA
> 
> 
> On Mar 11, 2011, at 3:01 PM, JAMES ROGERS wrote:
> 
>> It seems to me that switching your amp to standby while doing your adjustments would solve the problem?
>> 
>> 73s Jim
>> On Mar 11, 2011, at 2:47 PM, Scott Ellington wrote:
>> 
>>> I think this is normal, and it's annoying.  I don't know of any other transceiver that behaves this way.
>>> 
>>> 73,
>>> 
>>> Scott   K9MA
>>> 
>>> 
>>> 
>>> On Mar 11, 2011, at 2:40 PM, Sy Botan wrote:
>>> 
>>>> Most of my operating is on CW.  While staying in the CW receive mode I
>>>> operate the paddle to adjust speed and monitor level.  The transmit relay
>>>> activates and the amplifier relay also is activated.  Being in the CW
>>>> receive mode there is no RF output but the relay clanking is annoying.
>>>> Neither VOX or QSK is selected.  I tried to find some menu item that might
>>>> have an affect on the relay activation.  Did I overlook something or is this
>>>> normal?
>>>> 
>>>> Tnx de Sy K6PWP # 5223 (one week old)
>>>> ______________________________________________________________
>>> 
>>> Scott Ellington
>>> Madison, Wisconsin
>>> USA
>>> 
>>> 
>>> 
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>> 
>> JIM ROGERS, W4ATK
>> w4atk at bellsouth.net
>> http://web.me.com/jimrogers_w4atk
>> K3/100 P3
>> K2/10
>> 
>> 
>> 
>> 
> 
> Scott Ellington
> Madison, Wisconsin
> USA
> 
> 
> 
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Scott Ellington
Madison, Wisconsin
USA