Hi Bob, The Icom IC-703 was announced at HamFair Tokyo, and will be available in Japan at the end of this year. I should think that it will be available in North America by Dayton next year (or earli
Al, In this day and age, an HF transceiver capable of ham-band operation only is destined to have a very limited, and indeed diminishing market. The Japanese general-coverage HF radios find a wide sp
Hi Mike, Upon looking over your very impressive "AmpKeyer" product, I placed a link to your "AmpKeyer" page on the Icom FAQ site. This will be of great assistance to Icom HF radio owners who wish to
Gentlemen, Is it not high time we gave this melancholy thread the decent burial it so richly deserves? Best 73, Adam, VA7OJ/AB4OJ North Vancouver, BC, Canada http://www.qsl.net/ab4oj/
Mike, The IF filters do something which post-AGC audio filters can never do. As they are inside the AGC loop, IF filters remove strong interfering signals from the IF chain before they reach the AGC
Mike, Thanks for the heads-up. I was not aware that this was the case. In 1964, I designed and built a hybrid 20m SSB/CW transceiver in which the AGC was audio-derived. I considered placing a narrow
<<...Tayloe quadrature mixer direct to the A/D and DSP...>> The Rockwell-Collins 95S-1A receiver uses an image-reject I/Q mixer driving the ADC at zero IF. http://www.wa3key.com/95s1.html Best 73, Ad
<< ADVERTISING makes s** smell good :-) DSP radios are S** !! PERIOD, end of paragraph !! >> On the issue of DSP, leading radio manufacturers such as Rockwell-Collins, Harris and Rohde & Schwarz woul
Hi George, And in addition, my old IC-781 met NATO specs for frequency stability, accuracy and repeatability. I concur with your comments re PRO/PRO II. Cheers for now, 73, Adam VA7OJ/AB4OJ --Origina
<< Would someone kindly explain to me why I need to know my frequency with such precision? >> Simple answer: If your transmitter's frequency error puts you out of the band (or sub-band), you are oper
Hi Jerry, .....that is, before the Japanese manufacturers started using DDS. As far as I am aware, Icom pioneered DDS in amateur transceiver design. One of the first high-end Japanese HF transceivers
A preliminary study of the Orion information published thus far has peaked my interest in two areas: (1) I would be curious to know how the projected phase noise (transmitted composite noise) specs o
Hi Bob, Excessive transmitter IMD unnecessarily increases the occupied bandwidth of the transmitted signal, and has the potential to cause harmful adjacent-channel interference ("splatter") - particu