This afternoon I fired up my 700mW 500kHz WSPR beacon and wet string antenna (ERP microwatts) and got 3 reports from G3XVL at 61kms. So, I tried putting a 6dB then a 10dB attenuator between the PA and the ATU. Even with a
power from the PA of just 70mW (never mind what that would be as ERP from the antenna!) he still gave me a -25dB S/N report! These were the three reports in reverse order:
| 2009-09-14 14:42 | G3XBM | 0.503829 | -25 | 1 | JO02dg | 0.001 | G3XVL | JO02nb | 61 | 112 |
| 2009-09-14 14:40 | G3XBM | 0.503827 | -23 | 1 | JO02dg | 0.001 | G3XVL | JO02nb | 61 | 112 |
| 2009-09-14 14:36 | G3XBM | 0.503823 | -18 | 1 | JO02dg | 0.001 | G3XVL | JO02nb | 61 | 112 |
This suggests that just 35mW from the PA would have been enough to span this distance, even with my tiny antenna and poor ground.
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