[Elecraft] OT: definition of semi-breakin

[Ron D'Eau Claire]

IMX "semi breakin" means that you do not need to physically throw any
switches to go from transmit to receive. 

Compared to "QSK",  in semi-breakin you typically do not hear any signals
between code characters, letter or even words. Often the timing is variable,
but I've never seen anything approaching a specification for the fastest
switching that qualifies as "semi-breakin" any more than I've seen a
specification for the slowest switching that qualifies as QSK. Some consider
a rig full QSK if one can hear between letters, others expect to hear
between code elements. 

73 Ron AC7AC

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Edward R Cole
Sent: Tuesday, December 04, 2012 4:29 PM
To: Elecraft at mailman.qth.net
Subject: [Elecraft] OT: definition of semi-breakin

I suppose this forum is a good place to ask as so many are CW ops.

I am evaluating a pcboard relay for switching RF (Tx/Rx) and need to know
what speed that the relay needs to qualify for semi-breakin.  Also, a
precise definition of semi-breakin would be nice.

I get that QSK results in transfer from Tx to Rx after every CW character.
I'm guessing semi-breakin switches when there is a pause in transmitting.  I
can evaluate the switching speed of my candidate relays using a storage
scope but need a precise number on how fast they need to be.

73, Ed - KL7UW
PS: these relays will be switching 300w RF.

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