In article ,
Dan wrote:

In article ,
longwave wrote:

He doesn't need to own both radios to evaluate them. You conveniently
snipped the part where he made a direct comparison using the same
antenna and found that the 800 could hear anything the R75 was receiving
and with better audio. He made up his mind based on real world evidence.
That's the best anyone can do.

Indeed.

If anyone cares, I will be taking delivery of a new 800 and a little
used 700 this week (probably Tuesday, 4/13). I will be doing extensive
comparisons with my other radios, and will be happy to report my
findings.

What I find interesting is in another thread someone compared his $60
dollar Chinese portable to his IC-R75 and found that it heard everything
the IC-R75 did.

I've done some thinking on this "one radio hears a station and the other
didn't" situation when the sensitivity of the radios are within a few
dBm of each other. Normally it would not be reasonable to expect this
result.

I think the reason has to do with the radios input impedance changing
over frequency and not looking like a resistive load. With an antenna
not matched well on one end of a coax and the radio not being a good
match on some frequencies on the other end results can be unpredictable
with resonances at different frequencies for the different radios. This
will lead to unpredictable results.

In order to flatten out the response of the antenna / coax an attenuator
could be used absorb the reflections in the antenna system.

--
Telamon
Ventura, California