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Laurie Mayhead wrote:
In
a recent mail Mal said that he was not surprised that my sigs were heard/seen
in Canada, and that all that is required is a high/ long Ant and 1-5W ERP.
This is quite true but I should like to point out that my Ant. is only
48ft high,although the top load is 600ft. Also my power was only 125mW.
I agree that more could be done with a bit more power and a higher
Ant! but thats no reason for not trying Unfortunately I don't have a TX
at the moment after my Bar-B-Que,but there must be others who do.73s
Laurie.
Sorry Laurie to hear about your misfortune
just in the middle of of your experiments, perhaps it got over EXCITED
!!!!!!!!!!!!!!!
I use the same tx for both 73 and
136 khz, just change the drive input frequency and a different LPF at the
output for each band. The tx is similar to the YXM design and runs nearly
1kw output.
The tx is robust, no explosions to
date hi, but I monitor the SWR and DC current carefully for any changes.
My antenna is also robust, with good quality insulators and 2.5 mm insulated
wire through out. The system is all matched to 50 ohms, and every precaution
taken to avoid any variations in loading. I observe virtually no changes
regardless of the WX except in gales when there is movement of the
antenna wires, even then the swr does not exceed 1.5-1 but if it went higher
I would close down until the storm passed. Precautions like the above avoid
MELT DOWN !!!!!!!!!!!!!
My ground system consists of 2.5mm
insulated radials and some sheep fencing (no buried copper wire)
73 de Mal/G3KEV
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