Hi Adam,
I don-t think you published classic DR3 for the R8600 S/N 02001177.
Here are my initial measurements on 20m for noise floor and dynamic range.
Noise floor, 500 Hz
Preamp OFF: -131 dBm
Preamp ON: -142 dBm
Pre OFF IP+ ON: -130 dBm
Noise floor, 2400 Hz
Preamp OFF: -124 dBm
Preamp ON: -135 dBm
Pre OFF IP+ ON: -123 dBm
Sensitivity, 10 dB S+N/N 2400 Hz
Preamp OFF: 0.40 uV
Preamp ON: 0.12 uV
Pre Off IP+ ON: 0.49 uV
Classic DR3 (the first time IMD = NF, as it goes up and down above this value.
IP+ OFF
88 dB regardless of spacing at 20, 10, 5 and 2 kHz
DR3 with IP+ ON
20 kHz 109 dB
10 kHz 109 dB
5 kHz 108 dB
2 kHz 107 dB
Note: If the radio is tuned 1 kHz below or above the nearest 2 kHz DR3 test, the phase noise equals the noise floor.
In other words the RMDR is about 107 dB at 1 kHz, but with a 2-tone test, not a one tone test.
Let me know if you see anything that doesn-t jibe with your sample.
Rob
From:
ic-7300@yahoogroups.com [mailto:ic-7300@yahoogroups.com]
Sent: Thursday, November 02, 2017 3:32 PM
To:
ic-7300@yahoogroups.com
Subject: RE: [ic-7300] IP+ & FT8
Hi Rob,
To quote: "...so one would hope that IP+ in the 7610 will perform similarly. "
At the Dayton 2017 Icom stand, I listened to the intrinsic noise of the IC-7610 with the antenna port terminated and NR off, whilst toggling IP+ on and off. There was no audible change in noise level. That looks promising.
73, Adam VA7OJ/AB4OJ