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Band plans
In article ,
Michael Coslo wrote: I think that on some bands, such as 20 meters, a person can accidentally stomp on another due to propagation, So often we only hear (or see) one side of the QSO. We fire up, and soon the Ham we can hear and can hear us tells us of our error. That can happen on any HF band, I believe. This issue was behind a lot of the protest over one aspect of the ARRL's now-withdrawn "sub-bands by bandwidth" proposal. The proposal had suggested opening up a much larger portion of the band to unattended and semi-attended digital stations (typically, email servers). Such systems are rather notorious for "stepping on" QSOs in progress, due in part to this "only can hear one half of the existing QSO" problem. -- Dave Platt AE6EO Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
#2
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Band plans
Dave Platt wrote:
In article , Michael Coslo wrote: I think that on some bands, such as 20 meters, a person can accidentally stomp on another due to propagation, So often we only hear (or see) one side of the QSO. We fire up, and soon the Ham we can hear and can hear us tells us of our error. That can happen on any HF band, I believe. True, I used 20 meters as an example because it is the most common band with the "worst" problem. This issue was behind a lot of the protest over one aspect of the ARRL's now-withdrawn "sub-bands by bandwidth" proposal. The proposal had suggested opening up a much larger portion of the band to unattended and semi-attended digital stations (typically, email servers). Such systems are rather notorious for "stepping on" QSOs in progress, due in part to this "only can hear one half of the existing QSO" problem. Many is the time that those robot stations have obliterated the PSK-31 segment of 20 meters. Two of them close the band. They don't check, they just start transmitting, and they keep it up, presumably until they get acknowledgment from another robot station. It got so bad that Digipan added a decoder for the mode (no transmit) so that we gould catch the callsigns, record the disruption, and and turn them in to the FCC. Apparently this worked, because the problem is diminishing. - 73 de Mike N3LI - |
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