RadioBanter - View Single Post - SUPER J-POLE BEATS YAGI BY 1 dB

February 9th 05, 05:49 PM

wrote:
On 8 Feb 2005 18:49:05 -0800, wrote:

+1 dB was what our theoretical
difference was, but it may have been more.

First the average reciever will not see the differnce unless right at
the threshold of detection (MDS). The only place I've seen a 1db
difference that was detectable is in really weak signal systems.
In those systems the 1DB differnce cosses the threshold from just
noise to marginally detectable. Such as EME or my favortie mode
troposcatter.

The average FM broadcast system TX and RX runs at high power because
the average FM rx has limited sensitvity due to the required wide
bandwidth. Those recievers require a much larger signals to hit an
acceptable signal to noise and rarely can differentiate between
a 1db difference.

Then we agree. Most listeners
will not notice a 1dB difference.

These things are easily tested and easy to verify. If your trying
to resolve to bettern than .1DB that may be harder but,
3DB is easy and tends to jump at you.

3 dB? 100 watts versus 50?

Yeah, I should hope so!

Slick