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.
General specification
| Frequency range |
|
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|---|---|---|---|---|---|---|---|
| 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 |
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| External dimensions (I except the projections) |
About 425 (W) × 149 (H) × 435 (D) mm | ||||||
| Weight | About 23.5kg |
Transmission unit
| 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): Out-of-band region: |
| Carrier suppression ratio | 63dB or more |
| Unnecessary sideband suppression ratio | 70dB or more |
| Microphone impedance | 600Ω |
| TX variable range | ± 9.999kHz |
Receiving part
| Receiving scheme | Double superheterodyne system |
|---|---|
| Intermediate frequency | First: 64.455MHz (MAIN), 64.555MHz (SUB) Second: 36kHz |
| 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 |
Accessories
● SD card
● AC power cable
● spare fuse
● speaker plug other
Hi,
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
Thierry
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