Ed,
Semi-break-in to me means has meant that one does not have to listen to
clacking relays during the QSO, only at the beginning and end of the
transmission. Elecraft uses all electronic switching, so for all
Elecraft gear, that statement is moot - there are no relays to clatter
either with QSK or semi-break-in. Semi-break-in means that the
transceiver does not drop out of transmit state until after some defined
time (the delay time).
BUT, that does bring up another point - when a non-Elecraft device
containing relays (such as an amplifier - the time between the amp
keying signal becoming active and the onset of RF is unchanged by the
selection of QSK vs. semi-break-in. If the amp's relays are slow, hot
switching may still occur.
The K3 does permit a variable delay between Keyout and the onset of RF,
but for the K2, it is fixed.
73,
Don W3FPR
On 12/4/2012 7:28 PM, Edward R Cole wrote:
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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