Icom 775Dsp Serial Numbers

Policy Change: Icom America and its Icom Service Centers will now support and validate warranty repairs based on the serial number. What this means for you: The. Mar 18, 2007 Icom 775's have been out of production for about 3 years now. A few dealers had old stock to sell up until Dec of 2002. The highest serial number.

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. 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. 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 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. Samsung Cell Phone Driver Download Free here. I then brought back an from Dayton 2002. The Pro II had significantly improved as compared to the Pro. An replaced the Pro II in mid-2005.

The Pro III is superior to the Pro II in many ways. Here is a of the Pro II vs. In mid-2008, an replaced the Pro III; it is the receiver/exciter in my current. There is no gainsaying DSP-based HF radio architecture. Defence suppliers such as, and 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.