[BC] "Cusp Rotation"

[Phil Alexander]

On 16 Mar 2007 at 12:31, tom at bosscher.org wrote:

> Phil said:
> > That is to say something approaching the idea of a
> > **true** PA load sample that might be read by a RF
> > vector analyzer.
> 
>     Phil, have you had the chance to check out the TAPR/Ten-Tec VNA? I
> bought one, but I have not tried it on an AM station yet. < $ 700,
> plus a laptop. I get some really cool smith charts on my ham antennas
> (impresses the other guys at the ham club meetings, not that I know
> what anything means!) I do not know if this unit is precise enough for
> broadcast use, although they supply precise terminations to calibrate
> it. The power level might be on the low side for some sites though.
> 
> http://radio.tentec.com/Amateur/vna
> 

No, Tom, I haven't checked it out because I lost the reference I had
on it about a year ago. (Thanks for correcting that problem.) Looking 
at the specs., I'd like to have a bit better phase resolution in some 
cases, but hey, the overall picture is going to tell you most of what 
you need to know (but hoped you wouldn't find). Send your application 
for commission on the sale to Ten-Tec. <g>  I gotta play with this toy.

Now think what a Tx manufacturer could do with the same technology.


---------------------------------------------
Phil Alexander, CSRE, AMD
Broadcast Engineering Services and Technology 
(a Div. of Advanced Parts Corporation) 
Ph. (317) 335-2065   FAX (317) 335-9037