RadioBanter - View Single Post - Weird question

September 30th 05, 12:52 AM

In article .com,
wrote:

I'm a little surprised that the Sat 800 would generally outperform
the R-1000, but anyway...

On the day the R-1000 had the 'edge', had either it or the 800
changed position or orientation in any way? I'm wondering if, on this
particular day, you were using the R-1000 in a location that is
quieter than where it's usually situated.

Was there a change in the way either radio was powered?

I could be wrong, but I have the sneaking suspicion that something is
keeping the R-1000 from performing to its full potential most of the
time.

Maybe this is a good place to put in that most radios inputs are not
flat 50 ohms and with the antenna not matched perfectly on the far end
of the connecting coax moving the near end from one radio input to
another is not an equivalent situation. With reflections on the coax
both radios may not see the same signal level so even if they both have
the same level of sensitivity the same signal may appear much weaker on
one as opposed to the other.

It's a must at the least to check several frequencies and get the
averaged results to declare one more sensitive than the other.

The antenna, coax and receiver input match could change from day to day
changing results. The antenna is probably is what is changing the
equation, where the over all match is better with one radio over the
other. Antenna characteristics can change with temperature and
humidity. Ground conductivity can also come into play for single
element antennas that have ground as the other half of the antenna.

--
Telamon
Ventura, California