Hehehe....what's a paddle ? Does that make the funny "beeping" noise that I
always filter out ?
(grin)
Gary
----- Original Message -----
From: "Arthur Trampler" <atrampler@att.net>
To: <geraldj@storm.weather.net>; "Discussion of Ten-Tec Equipment"
<tentec@contesting.com>
Sent: Tuesday, October 30, 2007 4:04 PM
Subject: Re: [TenTec] Omni VI and non TT Amp
> "So you NEVER get excited and shout when chasing DX, so never drive the
> PA to clipping??? If that never happens you are one cool ham."
>
> What's shouting? Is that when I hit the paddle a bit harder?
>
> ;)
>
>
>
> ----- Original Message -----
> From: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
> To: <tentec@contesting.com>
> Sent: Tuesday, October 30, 2007 2:51 PM
> Subject: Re: [TenTec] Omni VI and non TT Amp
>
>
> > On Tue, 2007-10-30 at 10:58 -0400, Paul Christensen wrote:
> >> > "Cuz an Omni VI doesn't have ALC jack. Where you going to pug it in?
> >> 73 de K1ESE
> >> John"
> >>
> >> There's nothing wrong with the concept of ALC between the transceiver
and
> >> an
> >> amp, but more often than not, the real-world implementation is nothing
> >> more
> >> than a "feel good" exercise that leaves the operator with a false sense
> >> of
> >> security.
> >>
> >> >From what I've seen, the better ALC systems are employed within a
> >> >product
> >> line under one manufacturer where the designer can calculate the ALC
> >> voltage
> >> "meet me" point with some semblance of precision. For this reason, ALC
> >> within the transmitter section of the transceiver is much easier to
> >> manage.
> >> Even when some form of ALC voltage adjustment is used between an amp
and
> >> transceiver of different manufacturers, the ALC transient dynamics may
> >> not
> >> be optimized. Simply connecting an ALC cable between a transceiver and
> >> amp
> >> is no guarantee of good linearity and amp protection.
> >>
> >> For this reason, I have always shunned the use of ALC and try to pay
> >> attention to proper amp drive level and loading to ensure maximum
> >> linearity.
> >
> > So you NEVER get excited and shout when chasing DX, so never drive the
> > PA to clipping??? If that never happens you are one cool ham.
> >
> >> A better means of proper amp operations includes the use of a scope in
> >> trapezoid X-Y mode between the input and output of the amp.
> >
> > But it may not always inspire you to keep from a bit of peak
> > compression, will it? A little bit of peak compression can show up as a
> > lot of higher order intermod, otherwise known as splatter.
> >>
> >> Until the advent of DSP, an even better method consisted of applying
mic
> >> audio to one set of scope plates while applying final RF to the
opposite
> >> set. The benefit is that the entire system from mic to amp antenna
port
> >> is
> >> used to measure total system linearity. However, since transmit DSP
> >> introduces latency, even if slight, I've found that method no longer
> >> gives
> >> an accurate display of linearity.
> >
> > It didn't work too good in the analog radio either because of phase
> > shifts through the audio chain and time delay in the filter.
> >>
> >> Paul, W9AC
> >>
> > 73, Jerry, K0CQ
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec@contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
>
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|