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| To: | <[email protected]> |
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| Subject: | LF: Re: TA DX on the dreamers band? |
| From: | "James Moritz" <[email protected]> |
| Date: | Fri, 9 Jul 2010 00:16:14 +0100 |
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| In-reply-to: | <[email protected]> |
| References: | <[email protected]><002301cb1e8c$d28d4740$4001a8c0@lark><[email protected]><003001cb1eba$b04ba950$4001a8c0@lark> <[email protected]> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
Dear Warren, LF Group,I think that is a slightly pessimistic view - the first acknowledged 2-way transatlantic QSOs on 137kHz were, if I remember correctly, between G3LDO, VE1ZJ, and VE1ZZ in a 3-cornered QSO, and between G3AQC and VA3LK in a QSO spread over a number of nights, with each station transmitting on alternate nights. There have been a couple of 2-way QSOs between VO1NA and M0BMU using QRSS30. However, it is cetainly difficult to have QSOs like this - often several attempts are needed, even when both stations are at the "legal limit" ERP. Having a beacon signal that is regularly received is one thing, but when you go for a QSO it is quite another, since at least a few hours worth of break-free copy in both directions are needed to complete even a minimal QSO at these very low speeds. As the distances increase, the probability of this happening gets lower and lower, which puts the US stations at a disadvantage compared to the VE stations. Reducing keying speeds further is of limited benefit, because still longer periods of unbroken propagation are needed. Achieving 1W ERP on 136k at M0BMU has always involved precarious methods of temporarily extending the antenna height, including rigging the antenna in the dark, and nervously checking it while hoping it doesn't fall down! This is just due to typical space limitations. Combined with the fact that propagation is usually most viable during the few hours before dawn in Europe, this quickly becomes an exhausting process if more than a few attempts are needed. So there is a pressing need to develop better ways of having a QSO under these conditions. But for me, that is what keeps it interesting... Cheers, Jim Moritz73 de M0BMU |
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