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- Icom 756 Pro Iii Serial Numbers List
- Icom 756 Pro Iii
- Icom 756 Pro Iii Mods
- Icom 756 Pro Iii Serial Numbers 1
Adam, VA7OJ/AB4OJ's IC-756Pro III User Review
Initial observations (July 2005)
Notes on ALC
Display quality
A few measurements
MDS at 14.1 MHz (dBm) | ||
---|---|---|
Preamp | SSB 2.4 kHz | CW 500 Hz BPF |
Off | -126 | -131 |
1 | -133 | -139 |
2 | -135.5 | -142 |
Recip. Mixing (dB) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Note:BPF Indicator was on for CW filters.) Shape factors for all 3 filter settings met or exceeded Icom's advertised specifications. The measured -6/-60 dB shape factor for the 2.4 kHz SSB filter was 1.24; the spec is 1.5. Tip: To achieve optimum S/N ratio, the selected IF-filter bandwidth should not exceed the occupied bandwidth of the received signal. 4. SHARP vs. SOFT SSB filter roll-off. Test conditions: 10.000 MHz LSB, 2.4 kHz filter selected, RF input power -103 dBm (below AGC threshold), AGC off, preamp off, ATT = 0, NR off, NB off, Twin PBT neutral. Table 3 shows the roll-off for the [SHARP] and [SOFT] filter settings.
5. NR noise reduction, measured as SINAD. This test was intended to measure noise reduction on SSB signals close to the noise level. Initial test conditions: Sinadder configured for SINAD measurement. 10.000 MHz LSB, 2.4 kHz filter selected, AGC MID, preamp off, ATT = 0, NR off, NB off, Twin PBT neutral. The receive frequency was offset +1 kHz to produce the test tone, and RF input power was adjusted for a 6 dB SINAD reading (-127 dBm). NR was turned on, and SINAD read at 30% and 50% (max.) NR settings. The results are given in Table 4.
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