8R hold question

[Larry Clark]

Hi,

The K2 manual says to use "8R hold" to "improve"
amplifier keying.  It appears that this is to prevent
a mechanical relay in an amp from cycling too
frequently with the K2's QSK.  Is 8R hold necessary
with PIN diode switched amps like the Alpha?  Enabling
8R hold in my K2 introduces a slight popping into the
T-R switching as the rig returns to receive. This
degrades the otherwise nearly flawless break-in.  It
would certainly be preferable to leave 8R in the
normal setting if this does not introduce keying
problems.

73,  Larry,  K0RS



 
____________________________________________________________________________________
Don't pick lemons.
See all the new 2007 cars at Yahoo! Autos.
http://autos.yahoo.com/new_cars.html 
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Vic K2VCO]

Larry Clark wrote:

> Hi,
>
> The K2 manual says to use "8R hold" to "improve"
> amplifier keying.  It appears that this is to prevent
> a mechanical relay in an amp from cycling too
> frequently with the K2's QSK.  Is 8R hold necessary
> with PIN diode switched amps like the Alpha?  Enabling
> 8R hold in my K2 introduces a slight popping into the
> T-R switching as the rig returns to receive. This
> degrades the otherwise nearly flawless break-in.  It
> would certainly be preferable to leave 8R in the
> normal setting if this does not introduce keying
> problems.

There's no mechanical relay in the t/r path.  You don't need to use 8R
hold with an Alpha -- I used it both ways with an Alpha 86 that was pin
diode switched. There's enough delay built into the amplifier keying
circuit.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com