[ICOM] IC-7300 - a contest radio?

[Adam Farson]

To quote: ".it does not have filters preceding the first stage, it 

can have problems in a high RF environment."

 

The IC-7300 block diagram shows a preselector consisting of 12 contiguous
half-octave BPF's covering 1.6 - 74.8 MHz, plus a 1.6 MHz LPF. 

 

The OVF indicator lights when a -10 dBm or stronger signal outside the
detection passband is applied to the ANT port. As the IC-7300 has approx. 6
dB gain to spare, RF Gain can be turned town to extinguish the OVF indicator
without degrading the 7300's weak-signal performance.

 

The preamp should never be activated on or below 7 MHz, as all it does on
the lower bands is amplify band noise. In addition, RF Gain can be turned
down such that the S-meter barely deflects on band noise. As the band noise
on the lower bands is normally 10-12 dB below band noise, this will not
compromise usable sensitivity.

 

See also http://www.ab4oj.com/icom/dbmheaven.html

 

In extreme operating environments such as Field Day, external BPF's can be
beneficial. 

 

Here is the link to my IC-7300 test report:

 

http://www.ab4oj.com/icom/ic7300/7300notes.pdf

 

 

73, Adam VA7OJ/AB4OJ