>
>Tom says:
>
>
>>Bunk. The claims that all kinds of splatter is produced are
>>nonsense, mostly based on not understanding the effects of IMD.
>
>
>Sorry Tom, you're missing the point. My statement is that if you have a signal
> going into the PA and you switch the bias sharply, (we are assuming from cut
>off, by the way), then you'll effectively pulse modulate it, giving a sinx/x
>
>spectrum. On CW, we call this 'key clicks'.
>
>Now you're saying that there are better ways to implement electronic bias
>switching than switching to cut off. That is a different argument.
>
? Peter - - I find it hard to believe that running 5 or so mA of ZSAC is
going to fully cure this particular distortion problem when the tube
manufacturer recommends 75mA per bottle for linear operation. .
. The amazing thing to me about RF-bias touters is that they seem to
cheerfully ignore the fact modern transceivers Already Have a
delightsomely-right +LV DC T/R signal wired to a jack at the back that
gives a positive output which preceeds the RF output by at least 5mS --
a veritiable plenitude of time for high-speed relays to switch.
>
- later
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|