OwenDuffy.net 


 

FSM Receiver Tests

Note the Effective Noise Bandwidth (wrt gain at 1kHz) can be quite a deal less than obtained by eyeballing the -6dB points. Further, the passband of receivers often exhibits a considerable downward slope with frequency across the passband. Attempts to guestimate the Effective Noise Bandwidth are likely to be in error by up to a couple of dB, see the article Measuring receiver bandwidth.

Table 1: Receiver tests at 7MHz
Model Lower 6dB point (Hz) Upper 6dB point (Hz)

Effective Noise Bandwidth (Hz)

Rx Noise Figure (dB)

Test date

ID

Comment
IC7000 216 2748 2090 17.4 30/06/06 VK1OD Pre-amp OFF, Filter 300/2400 sharp, AGC 30dB.
IC7000 216 2748 2090 6.5 30/06/06 VK1OD Pre-amp ON,  Filter 300/2400 sharp, AGC 29dB.
IC706IIG 339 2213 1875 6.25 20/02/05 VK1OD #1 Pre-amp ON. 
IC706IIG 339 2213 1875 10.00 10/06/05 VK1OD #1 Pre-amp OFF. 
IC706IIG 296 2277 2003 6.11 20/02/05 VK1OD #2 Pre-amp ON.
IC706IIG 296 2277 2003 9.61 10/06/05 VK1OD #2 Pre-amp OFF.
R5000 263 2664 1980 15.60 20/02/05 VK1OD  
TS2000 300 1900 1450 16.30 03/07/05 VK1OD Pre-amp OFF, Filter 300/2400, wider filter settings have noticeable slope. (AGC threshold is about 14dB with pre-amp ON, about 21dB with pre-amp OFF.
IC7400 (IC746PRO) 296 2567 1698 5.58 20/02/05 VK1OD Pre-amp ON, Filter 2400 soft, wider filter not as flat.
IC7400 (IC746PRO) 240 2740 2149 4.55 20/02/05 VK1OD Pre-amp ON, Filter 2400 sharp, wider filter not as flat.
IC756PROII 294 2715 2254 14.4 10/12/05 VK1OD Pre-amp OFF, Filter 2400 sharp, slight slope, AGC Threshold 25dB.
IC756PROII 294 2715 2254 5.0 10/12/05 VK1OD Pre-amp ON, Filter 2400 sharp, slight slope.
ICR20 300 2500 1580 5.59 20/02/05 VK1OD Poor IF filter shape factor, slope across pass-band.
FT920 340 2700 2100 7.65 01/10/05 VK2AAB Slope across pass band.
FT7 473 2626 2153 12.6 16/12/05 VK7TW  
R1000     1780 7.0 06/03/07 VK1GH 14MHz
DX-70 615 2130 1265 17.1 17/11/2006 VK2DKN Filter narrow LSB, no preamp, no att.
IC-910 270 2612 1971 4.9 18/10/2008 VK7MO NF based on specification sensitivity.
IC-7410 270 2754 2038 14.2 10/03/2014 VK2OMD Pre-amp OFF, Filter 2400 soft.
 

 


© Copyright: Owen Duffy 1995, 2016. All rights reserved. Disclaimer.