"Telamon" wrote in message
...
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

Could be -- but I think it's more likely just a combination of wishful
thinking and enthusiasm getting in the way of objectivity.

The radios they're talking about (Kaito 1102 / Degen 1102) are extremely
good values at twice their price (I have the Kaito 1102). But some of the
stuff I was reading made me laugh out loud.

-- Stinger

In article ,
"Stinger" wrote:

"Telamon" wrote in
message
...
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.


Could be -- but I think it's more likely just a combination of
wishful thinking and enthusiasm getting in the way of objectivity.

The radios they're talking about (Kaito 1102 / Degen 1102) are
extremely good values at twice their price (I have the Kaito 1102).
But some of the stuff I was reading made me laugh out loud.

Well, I meant tabletop radio comparisons. I did not mean to extend it to
the portables but you have to agree that somewhere between these
extremes the truth must lie.

--
Telamon
Ventura, California