Icom R8500 Serial Numbers

On

Jan 09, 2015  If the first digit of the country/region prefix in the serial number is 1, the IC-7700 is unequivocally a Rev. 12 is the US/Canada version with S/N of the form 12XXXXX. Other prefixes are 11 for Japan (domestic) and 13 for EU.

  • Icom IC-R9000 Wideband Shortwave FM VHF UHF Receiver RF A Unit w/ Bandpass & IF

    This sale is for the RF 'A' module which contains the bandpass and IF and mixer circuits. The module worked perfectly prior to its removal from the R9000. When you remove the covers, the electronics appear to be in excellent condition.
    Type: Base Station
    $64.00 shipping
    Brand: IcomBand: HF
  • Icom IC-R7000 VHF UHF FM Radio Receiver 25 MHz thru 1999 MHz **CLASSIC UNIT**

    Over the years, we have sold about 85 of these Icom R7000 receivers. Icom designed this receiver to mate with its R 71A receiver which covers the low bands. We take HD pictures so that you can use the magnification to see even the smallest details.
    Type: Base Station
    $110.60 shipping
    Brand: IcomBand: VHF
  • Icom IC-R7000 VHF UHF FM Ham Radio Communications Receiver SN 06320 - L04

    This receiver is in good used working condition. It has been tested successfully.
    Top Rated Plus
    $32.10 shipping
    Type: Base StationBrand: IcomBand: VHFCustoms services and international tracking provided
  • Icom IC-R7000 VHF UHF FM Radio Receiver 25 MHz thru 1999 MHz **CLASSIC UNIT**

    Over the years, we have sold about 85 of these Icom R7000 receivers. Icom designed this receiver to mate with its R 71A receiver which covers the low bands. There is one broken screw head on the top cover which is of little significance.
    Type: Base Station
    $110.60 shipping
    Brand: IcomBand: VHF
  • Icom IC-R75 Shortwave Radio Receiver w/ UT-106 DSP Module & ***KIWA Sync Mod***

    When the Icom sync detector was installed in earlier manufactured units (it was deleted from later units), it had issues like easily losing lock and also sub-par performance. Kiwa provided two major upgrades to the synchronous detector and they combine to enhance performance to enable the PLL to remain locked under the most difficult signal conditions.
    Type: Base Station
    $115.45 shipping
    Brand: IcomBand: HF
  • NEW ICOM IC-R8600 #04 SSB/AM/FM/WFM/CW Desktop Wideband Radio Receiver unblock

    IC-R8600 Wideband receiver new in box. 10kHz to 3GHz Super Wideband Coverage. ModeUSB, LSB, CW, FSK, AM, FM, WFM. 1 BW: WFM=180kHz, FM=15kHz, AM=6kHz. WFM (at 12dB SINAD) NXDN is a trademark of Icom Incorporated and JVC KENWOOD Corporation.
    From Taiwan
    Free shipping
    Type: Base StationBrand: Icom
  • Icom FL-257 Wide SSB 3.3 Khz Filter For Receiver Transceiver **SCARCE**

    If you regularly listen to sideband, you know that when the bands are less crowded and there is less QRM, then using a wider filter such as this will enable you to enjoy a wider frequency response for more enjoyable listening.
    Type: Base Station
    $11.95 shipping
    Brand: IcomBand: HF
  • Icom IC-R7000 VHF UHF FM Radio Receiver 25 MHz thru 1999 MHz **BUILT LIKE A TANK

    Over the years, we have sold about 85 of these Icom R7000 receivers. Icom designed this receiver to mate with its R 71A receiver which covers the low bands. We take HD pictures so that you can use the magnification to see even the smallest details.
    Type: Base Station
    $114.70 shipping
    Brand: IcomBand: VHF
  • Icom IC-R7000 VHF UHF FM Radio Receiver 25 MHz thru 1999 MHz **CLASSIC UNIT**

    Over the years, we have sold about 85 of these Icom R7000 receivers. Icom designed this receiver to mate with its R 71A receiver which covers the low bands. We take HD pictures so that you can use the magnification to see even the smallest details.
    Type: Base Station
    $110.60 shipping
    Brand: IcomBand: VHF
  • ICOM IC-R8600 Desktop Unlocked Wideband Radio Receiver BOX SSB/AM/FM/WFM/CW

    (Reception mode USB, LSB, CW, FSK, AM, FM, WFM. WFM (BW = 180 kHz; at 12 dB SINAD). Representative value) SSB / CW / FSK. (BW = 2.4 kHz for SSB / FSK, BW = 0.5 kHz for CW, at 10 dB S / N). Furthermore, it has excellent reception sensitivity and multi-signal characteristics such as adopting a bandpass filter of 11 division (HF band) and 13 division (V / U band) at the RF end front end.
    From Japan
    $15.00 shipping
    Type: Base StationBrand: IcomBand: AM
  • NEW ICOM IC-R8600 EXP SSB/AM/FM/WFM/CW Desktop Wideband Radio Receiver unblock

    IC-R8600 Wideband receiver new in box. 10kHz to 3GHz Super Wideband Coverage. ModeUSB, LSB, CW, FSK, AM, FM, WFM. 1 BW: WFM=180kHz, FM=15kHz, AM=6kHz. WFM (at 12dB SINAD) NXDN is a trademark of Icom Incorporated and JVC KENWOOD Corporation.
    From Taiwan
    Free shipping
    Type: Base StationBrand: IcomBand: HF
  • Icom FL-222 Crystal SSB 1.8 KHz Filter For Receiver Transceiver

    This sale is for the Icom FL-222 as a 1.8 KHz narrow sideband filter. This filter is used but is in perfect operational condition. The known Icom units that can utilize this filter are (there may be others).
    Type: Base Station
    $13.99 shipping
    Brand: IcomBand: HF
  • Icom IC-R8600 Wideband Receiver SSB/AM/FM/WFM/CW/DIGITAL Fast Shipping Japan EMS

    Analog signals such as USB, LSB, FSK, CW, AM, S-AM(Synchronous-AM), FM and WFM modes. Mode: USB, LSB, CW, FSK, AM, FM, WFM / DIGITAL(D-STAR, DCR, dPMR, NXDN, P25). Type: Wideband receiver. English version manuals can be downloaded for free from the iCOM global site.
    From Japan
    Free shipping
    Type: Base StationBrand: IcomBand: FM
  • Icom IC-R7000 Receiver Rear Panel w/ Power Supply ***REPLACEMENT***

    Type: Base Station
    $72.85 shipping
    Brand: IcomBand: UHF
  • Icom IC-R9000 Wideband Shortwave FM VHF UHF Receiver IF Board

    The board worked perfectly prior to its removal from the R9000. The filters have been removed so this sale is for the board minus the main RF filters.
    Type: Base Station
    $40.50 shipping
    Brand: IcomBand: HF
  • ICOM IC-R8600 Desktop Unlocked Wideband Radio Receiver BOX SSB/AM/FM/WFM/CW

    (Reception mode USB, LSB, CW, FSK, AM, FM, WFM. WFM (BW = 180 kHz; at 12 dB SINAD). Representative value) SSB / CW / FSK. (BW = 2.4 kHz for SSB / FSK, BW = 0.5 kHz for CW, at 10 dB S / N). Furthermore, it has excellent reception sensitivity and multi-signal characteristics such as adopting a bandpass filter of 11 division (HF band) and 13 division (V / U band) at the RF end front end.
    From Japan
    Free shipping
    Type: Base StationBrand: IcomBand: AM
  • Icom IC-R9000 Wideband Shortwave FM VHF UHF Receiver IF Board

    The board worked perfectly prior to its removal from the R9000. The filters have been removed so this sale is for the board minus the main RF filters.
    Type: Base Station
    $40.50 shipping
    Brand: IcomBand: HF
  • Icom IC-R9000 Wideband Shortwave FM VHF UHF Receiver Front Panel w/ Boards &Pots

    This sale is for the complete front panel and electronics.
    Type: Base Station
    $76.95 shipping
    Brand: IcomBand: HF
  • Icom IC-R9000 Super Receiver Top & Bottom Covers

    This sale is for the top and bottom covers of the receiver. As you can see, these covers do not include the cover plate on the top and the feet on the bottom. The speaker is included and works wonderfully.
    Type: Base Station
    $86.05 shipping
    Brand: IcomBand: UHF
  • Icom IC-R9000 Wideband Shortwave FM VHF UHF Receiver Front Panel w/ Boards &Pots

    This panel is being sold as a complete unit to allow for an easy swap or for you to have a wealth of parts including electronics, pots, etc. This sale is for the front panel and electronics.
    Type: Base Station
    $76.95 shipping
    Brand: IcomBand: HF
  • Icom IC-R7000 Receiver RF Board ***REPLACEMENT***

    This board is a 'plug-n-play' variety that installs with screws and then plugs into the circuitry and so does not require any soldering to install.
    Type: Base Station
    $26.00 shipping
    Brand: IcomBand: UHF
  • Icom IC-R7000 Receiver Main Board Unit (Left Side Location)

    This sale is for an Icom IC-R7000 main board as found on the left hand side of the receiver. Relay for Recording Remote Function. This board includes such operations as Signal Center Frequency Detector Unit.
    Type: Base Station
    $26.00 shipping
    Brand: IcomBand: UHF
  • Icom IC-R9000 Wideband Shortwave Receiver Rear Panel

    This sale is for rear panel of the receiver.
    Type: Base Station
    $37.50 shipping
    Brand: IcomBand: HF
  • Icom IC-R9000 Wideband Shortwave FM VHF UHF Clock Battery SW-D Board

    This sale is for the SW-D clock battery board of the receiver and it was tested and worked perfectly prior to its removal from the receiver.
    Type: Base Station
    $16.25 shipping
    Brand: IcomBand: HF
  • Icom IC-R7000 Receiver IF Board ***REPLACEMENT***

    This board is a 'plug-n-play' variety that installs with screws and then plugs into the circuitry and so does not require any soldering to install.
    Type: Base Station
    $26.00 shipping
    Brand: IcomBand: UHF
  • Icom IC-R7000 Receiver DC - DC Board ***REPLACEMENT***

    This board is a 'plug-n-play' variety that installs with screws and then plugs into the circuitry and so does not require any soldering to install.
    Type: Base Station
    $16.25 shipping
    Brand: IcomBand: UHF
  • Icom IC-R7000 Receiver S-Meter **Replacement**

    Type: Base Station
    $16.25 shipping
    Brand: IcomBand: UHF
  • Icom Small Control Knob For IC-R70 / IC-R71A / IC-R7000 Receivers **REPLACEMENT*

    This is the small knob that has the aluminum skirt and we ask you to carefully observe and verify that you are ordering the correct knob for your receiver. The knob is in nice overall condition showing only minor signs of age and use.
    Type: Base Station
    $12.99 shipping
    Brand: IcomBand: UHF
  • Icom Control Knob For IC-R70 / IC-R71A / IC-R7000 Radio Receivers **REPLACEMENT*

    This is the knob that has the aluminum skirt and we ask you to carefully observe and verify that you are ordering the correct knob for your receiver. The knob is in nice overall condition showing only minor signs of age and use.
    Type: Base Station
    $12.99 shipping
    Brand: IcomBand: UHF

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by Adam Farson, VA7OJ/AB4OJ

My IC-781, and its Successors

An IC-781 graced my shack from mid-1993 until late 1998. I found that it was lacking in adjacent-channel selectivity on SSB, so I installed the 'NATO' filter mod - FL-44A in lieu of FL-96. I also replaced the stock FL-102 with an FL-223 for narrow SSB.

Then, I bought an 'original' IC-756. The 756, with its DSP NR, outgunned the 781 + outboard NIR-12 on weak/noisy signals, and offered superior adjacent-channel selectivity with the FL-222/223 SSB filter pair installed. So I reluctantly let the 'old girl' go.

Whilst living in Florida, I was an NCS on the Icom Users' Net (formerly 14317 kHz, Sundays, 1700Z) for several years. At times, adjacent-channel interference became a severe issue, what with our frequency sandwiched between the 'hot-spots' which used to occupy 14313 and 14322 kHz. The Icom Net has since moved to 14.316 kHz, to get away from the fourth harmonic of the TV colour-burst.

Heredis 2014 mac serial number. Even with the 'NATO' filter upgrade and the FL-223, the ACI and splatter would sometimes overwhelm the 781. I found that the IC-756's cascaded 1.9/1.8 kHz narrow SSB filters (FL-223/222), together with Twin PBT, did a better job of 'pulling out' the desired signal than the IC-781.

Netgear R8500 Serial Number

Another situation which frequently arose was trying to copy a check-in station running barefoot to an indifferent antenna; often, his signal was in the noise. I found that the DSP noise-reduction feature of the IC-756 often resolved these weak signals well enough for Q4 to Q5 copy, when they eluded the 781 - even with an outboard JPS NIR-12 audio DSP box.

It should be noted that reciprocal mixing noise (a function of DDS spectral purity) is a very strong attribute of the IC-781. On 20m, with 10 kHz offset, the measured reciprocal mixing noise 'numbers' for the IC-781 are 1 dB better (RF preamp off) than those of its competitor, the Yaesu FT-1000D, and 11 dB better with RF preamp on. The IC-781 uses the same DDS synthesiser chipset as the IC-275 family of VHF/UHF all-mode radios.

In 2000, an IC-756Pro replaced the 756, and I found it even better all around. It even has a tuneable pre-AGC notch filter, unfortunately omitted from the 756. I then brought back an IC-756Pro II from Dayton 2002. The Pro II had significantly improved strong-signal handling as compared to the Pro.

An IC-756Pro III replaced the Pro II in mid-2005. The Pro III is superior to the Pro II in many ways. Here is a comparison of the Pro II vs. the Pro III.

In mid-2008, an IC-7700 replaced the Pro III; it is the receiver/exciter in my current station.

There is no gainsaying DSP-based HF radio architecture. Defence suppliers such as Rockwell Collins, Harris and Rohde & Schwarz have been using DSP for years in their HF equipment. It is only in recent years that DSP chipsets have reached a price/performance level accessible to the amateur community.

Radio architecture is now at the point where classical analogue designs are no longer cost-effective to manufacture, and DSP will only get faster and better. However, analogue radios (such as the IC-781) will still be available in the second-hand market for years to come.

From the ham radio standpoint, the IC-781 was an accident of history which turned out very well indeed. Icom developed this radio under a defence contract; soon thereafter, the ham community 'discovered' its incredible performance - way ahead of the pack at the time - and its unique features such as the Spectrum Scope, Dual Watch and Twin PBT. Those radio amateurs who could justify its (then) $5000 price tag bought every IC-781 available on the open market.

Technology has moved on, now, and the 'old girl' is discontinued - but many of these fine radios are still on active duty in government communications centres (and ham shacks) world-wide.

The IC-781 on the Used Market

I sold my then 5-year-old IC-781 in December 1998, when I found that the IC-756 outgunned it in weak-signal reception. The later serial number ranges (anything above 2500) are preferable; the newer the radio, the less likely it is to have heat damage on the power-supply (PI Unit) board, or CRT screen burn. My radio was S/N 2936, manufactured in mid-1993.

At the present time (2014) one should not pay more than around $2000 for a used IC-781. In 2001, a good friend of mine in New England paid around $2700 for a 781 in the S/N 2900 range.

One should also consider that IC-781 parts have become very scarce. The CRT module, which used to cost $800, is no longer available, although replacement tubes can be had on the surplus market. The monochrome LCD display module used in the R-9000L will fit in the IC-781; it used to cost over $1000, is difficult to find and is no match for the old CRT in image quality.

This does not take away from the superior reliability of the radio in its time; in the five years I had my 781, it never gave a lick of trouble. There have been no more than two or three service bulletins during the entire product life of the 781.

The power-supply heat problem in the IC-781 is a matter of concern. The power supply uses a shunt regulator, and was designed for the Japanese 100V mains supply. When connected to 120V mains, the power supply dissipation increases by 44%. The heatsink was not designed for the additional thermal load; consequently, the power-supply area runs very hot. This can lead to component breakdown over time. Further reading.

Icom R8500 Serial Numbers

Download Traian YO9FZS' excellent article 'IC-781 & IC-R9000 technical and maintenance issues'.

Read Refurbishing the Icom IC-781 Regulator Unit.

SSB Filter Upgrade Modification (the 'NATO' Filter Mod)

There is a filter upgrade which I also posted on mods.dk It consists of replacing the FL-96 with an FL-44A, and the FL-102 with an FL-223. The FL-44A improves the adjacent-channel selectivity and Twin PBT operation, and the FL-223 provides a Narrow SSB setting.

ALC Modification

Icom R8500 Serial Numbers

Vince Fedele K1VF has developed an excellent ALC modification for the IC-781, to eliminate the initial RF power spike on keying the transmitter. Download the PDF here.

UX-R9000 LCD Display Installation

Download the installation manual.

  • IC-7800 vs. IC-781: Comparative review by Johnny Siu VR2XMC

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