[Elecraft] 8R - 8T lines

[mikekopacki]

I'm trying to understand exactly (well, more or less) what the 8R/8T settings 
do.

In the primary menu, under T-R, you set it as either '8r hold' or '8r nor'.

The manual says to user the 'hold' option for all modes of operation.  It also 
says that it ...holds the 8R line low during the user programmed QSK delay.

Does this imply that if I choose the 'nor' option, and have the T-R delay time 
set to a longer period (say, 1 second), that the 8R line will not be held low 
during the entire 1 second delay?  And if not, what is the result?

Can anyone help me understand this?

Thanks,
Mike, NJ2OM



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Re: [Elecraft] 8R - 8T lines

[Vic Rosenthal]

[EMAIL PROTECTED] wrote:


Does this imply that if I choose the 'nor' option, and have the T-R delay
time set to a longer period (say, 1 second), that the 8R line will not be
held low during the entire 1 second delay?  And if not, what is the result?


I think that if you are talking about a K2 by itself, the result will be 
absolutely nothing.  The receiver will be muted for the period of the t-r delay 
regardless of the setting.  However, the amplifier keying output of the K2/100 
and (I think) the transceiver t-r switching is based on the 8r line.


So if, for example, you are using the K2 with an external amplifier or 
transverter that has slowish mechanical relays for t-r switching, you should use 
the 8r hold option so that you can control the hold time of the external relay 
with the t-r parameter.


8r normally goes low about 15ms (someone will correct me if this is inaccurate) 
before the K2 begins to make RF, and goes high again some time after output 
stops.  It can be used to key an external amplifier that has vacuum relays or 
pin diode switching directly without hot switching.


--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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