I am using the term CW splatter to cover clicks, phase noise, IMD and other hallmarks of a wide signal. >> >> To me, the graphs presented by K9YC are compelling. It is clear that a >> number of modern radios are significantly “dirtier” than others, while a >> TS590, that currently costs under $1500 at DXE, looks quite clean. The >> charts display TX spectrum images from mid range transceivers to >> premium rigs (15 rigs total) such as the K3, Flex and others. Take a >> look at K9YC.com/TXnoise.pdf. >> >> A dirty TX rig has much less impact on casual operating, or even most >> Dxing, as the band isn’t usually crowded. It is another story in a contest >> as many offenders run HP with huge antennas. They are LOUD. I have had >> to move many times when a loud, splattering CW signal parks a few >> KHZ away. >> >> The cost of a clean TX is insignificant compared to such station’s antenna, >> feedline and tower investment- plus all the other peripherals such a BPFs. >> >> Anyone who operates contests has heard such signals many times. >> It begs credulity that owners who are serious competitors aren’t aware >> of the issue. But it appears that little is done as most hams (including the >> log checkers) are reluctant to press. Rather than ignore the issue, radio >> manufacturers need to lose sales due to poor TX performance by hams >> voting with their dollars. I am glad the ARRL now takes a more proactive >> role in evaluating TX performance. >> >> I understand the argument that we need to encourage activity, especially >> from modest stations. I could not agree more, but in contests it is the loud >> stations with dirty signals -often using big antennas- that affect other >> competitors adversely, not just those nearby. >> >> It is time to place as much emphasis on a clean TX as on impressive >> receiver specs. Some manufacturers, including Elecraft, already have. >> >> The CW splatter problem is noticeable in EU and NA, sometimes emanating >> from huge MM stations. I imagine that it occurs worldwide, but the Asians >> are >> not generally that loud so their splatter is buried in the noise. >> >> 73, >> Phil KT3Y- KP2M >> >> >>
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