Icom just posted their new flagship product on the japanese website: IC-7851. It doesn’t seem to be a completely new product – as the front panel is almost identical to the IC-7800, but appearences can be misleading.
Icom claims redesigned insides for the IC-7851, aimed at improving performance “no matter what cost”. They targeted the LO (much lower phase noise local oscillator), the DSP (we might finally have a working bandscope), the exciter BPF block is now relay-switched (as the PIN diodes bring some distorsions into the mix) and they added few more bells and whistles such as USB mouse support, DVI display output and SP-DIF audio I/O. There is also a new 1.2kHz “OPTIMUM ROOFING FILTER” on the 1st IF (64MHz).
Probably the most effort was put into improving performance as the IC-7800 didn’t really measure up to the competiton from Yaesu and Kenwood, so the new figures for Reciprocal Mixing Dynamic Range look impressive:
Official claim is 110dB dynamic range and +40dBm IP3, wich is competitive enough. The price point for the Icom IC-7851 in the japanese market is 1.1 million yen, wich is about US$9200 – both the Yaesu FTdx-5000MP and the Kenwood TS-990S were initially listed around US$8200.
The complete list of specs below; not sure what’s with the limited TX range on 160m and 80m, might be a requirement of the japanese market.
|Mode||LSB, USB, CW, RTTY, PSK31 / 63, AM, FM|
|The number of memory channels||101 (split memory 99ch + scan edge 2ch)|
|Antenna impedance||50Ω (unbalanced)|
|Antenna terminal||HF / 50MHz band for M type 4 system, BNC type 2 system for reception|
|Power-supply voltage||85 ~ 265V AC|
|Grounding scheme||Minus ground|
|Operating temperature limit||0 ℃ ~ + 50 ℃|
|Frequency stability||± 0.05ppm within (at the time of 0 ℃ ~ + 50 ℃ / 54MHz)|
|Frequency resolution||Minimum 1Hz|
|Power consumption||Receiving standby time of 120VA (TYP)
Reception at the maximum 130VA (TYP)
Send at the maximum 800VA
(I except the projections)
|About 425 (W) × 149 (H) × 435 (D) mm|
|Transmission output||SSB, CW, FM, RTTY, PSK31 / 63: 5W ~ 200W
AM: 5W ~ 50W
|Modulation scheme||SSB: balanced modulation
AM: low-power modulation
FM: phase modulation
|Spurious emission intensity||Harmonic:
More than 60dB (HF band)
70dB or more (50MHz band)
Spurious area (I except the harmonic):
|Carrier suppression ratio||63dB or more|
|Unnecessary sideband suppression ratio||70dB or more|
|TX variable range||± 9.999kHz|
|Receiving scheme||Double superheterodyne system|
|Intermediate frequency||First: 64.455MHz (MAIN), 64.555MHz (SUB)
|Receiver sensitivity (TYP)||SSB / CW / RTTY / PSK (BW = 2.4kHz) (when 10dB S / N)
0.1MHz ~ 1.7999MHz: -6dBμ (preamplifier 1: When ON)
1.8MHz ~ 29.990MHz: -16dBμ (preamplifier 1: When ON)
50MHz ~ 54MHz: -18dBμ (preamplifier 2: When ON)
AM (BW = 6kHz) (when 10dB S / N)
FM (BW = 15kHz) (when 12dB SINAD)
|Squelch sensitivity||SSB / CW / AM / RTTY / PSK: + 15dBμ below
FM: 0dBμ below
|Selectivity (TYP)||SSB (BW = 2.4kHz): 2.4kHz more / -3dB 3.6kHz or less / -60dB
CW / RTTY / PSK (BW = 500Hz): 500Hz or more / -3dB 700Hz or less / -60dB
AM (BW = 6kHz): 6.0kHz more / -3dB 15kHz or less / -60dB
FM (BW = 15kHz): 12kHz or more / -6dB 20kHz or less / -60dB
|Spurious interference ratio||70dB or more|
|Low-frequency output||More than 2.6W (8Ω load, when 10% distortion)|
|Low-frequency load impedance||8Ω|
|RIT variable range||± 9.999kHz more|
● SD card
● AC power cable
● spare fuse
● speaker plug other
I read many figures about Icom new RTX IC-7851 but I do not find some numbers.
I am searching for a frequency of 14 MHz and a 2 kHz spacing,
the Blocking gain compression in dB anf the 3d order Interception point (IMD) in dB.
Used with factory settings and without Inrad filter, I have found an IMD of 116 dB (to confirm) but no data for the Blocking gain compression at 2 kHz ? Do you now its value ?
Thanks in advance
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