| Date | Time | Station | dBuV/m | Rx i/p dBm | S meter |
| 7.1.00 | 2328 | CFH | 27 | -70 | S9+3dB |
| 7.1.00 | 2329 | Greek | 34 | -63 | S9+10dB |
| 7.1.00 | 2334 | DCF39 | 79 | -24 | S9+49dB |
| 8.1.00 | 0504 | CFH | 27 | -70 | S9+3dB |
| 8.1.00 | 0508 | Greek | 32 | -65 | S9+8dB |
| 8.1.00 | 0512 | DCF39 | 65 | -32 | S9+41dB |
| 8.1.00 | 0748 | DCF39 | 63 | -34 | S9+39dB |
| 8.1.00 | 0820 | PA0LEG | 26 | -71 | S9+2dB |
| 8.1.00 | 0827 | G4GVC | 13 | -84 | S7+1dB |
| 8.1.00 | 0830 | CFH | 11 | -86 | S6+5dB |
| 8.1.00 | 0841 | OE5ODL | -3 | -100 | S4+3dB |
| 8.1.00 | 0906 | ON7YD | 17 | -80 | S7+5dB |
| 8.1.00 | 0911 | Greek | 15 | -82 | S7+3dB |
| 8.1.00 | 0913 | DCF39 | 66 | -31 | S9+42dB |
| 8.1.00 | 0943 | G6RO | -3 | -100 | S4+3dB |
| 8.1.00 | 0948 | ON6ND | 28 | -69 | S9+4dB |
| 8.1.00 | 0958 | DK8KW | 12 | -85 | S7 |
| 8.1.00 | 1024 | DL3FDO | 6 | -91 | S6 |
| 8.1.00 | 1034 | PA0BWL | 23 | -74 | S8+5dB |
| 8.1.00 | 1045 | G3OLB | 6 | -91 | S6 |
| 8.1.00 | 1140 | DCF39 | 64 | -33 | S9+40dB |
| 8.1.00 | 1215 | DK5PU | 7 | -90 | S6+1dB |
| 8.1.00 | 1238 | G3AQC | 8 | -89 | S6+2dB |
| 8.1.00 | 1250 | Greek | 15 | -82 | S7+3dB |
| 8.1.00 | 1254 | G3XTZ | 19 | -78 | S8+1dB |
| 8.1.00 | 1315 | G3YXM | 17 | -80 | S7+5dB |
| 8.1.00 | 1320 | G3YXM | 16 | -81 | S7+4dB |
| 8.1.00 | 1358 | DJ9IE | 7 | -90 | S6+1dB |
| 8.1.00 | 1436 | DJ6FU | 12 | -85 | S7 |
| 9.1.00 | 0824 | CFH | 20 | -77 | S8+2dB |
| 9.1.00 | 0826 | Greek | 19 | -78 | S8+1dB |
| 9.1.00 | 0828 | DCF39 | 65 | -32 | S9+41dB |
| 9.1.00 | 0841 | G4GVC | 13 | -84 | S7+1dB |
| 9.1.00 | 0858 | ON7YD | 19 | -78 | S8+1dB |
| 9.1.00 | 0915 | GI3PDN | - | - | S3 by ear |
| 9.1.00 | 1018 | G3KEV | 20 | -77 | S8+2dB |
| 9.1.00 | 1023 | G3YXM | 15 | -82 | S7+3dB |
| 9.1.00 | 1028 | Greek | 24 | -73 | S9 |
| 9.1.00 | 1029 | DCF39 | 64 | -33 | S9+40dB |
| 9.1.00 | 1058 | DJ9IE | 19 | -78 | S8+1dB |
| 9.1.00 | 1100 | G3XDV | 9 | -88 | S6+3dB |
| 9.1.00 | 1110 | PA0BWL | 24 | -73 | S9 |
Method of measurement.
I could not use my Wandel & Goltermann PSM-5 selective level meter. The needle jumps around too wildly for a proper reading on CW (and they call CW Continuous Wave ...). Also its selectivity is not sufficient.
Instead I applied a substitution method. The receiver is a Teletron LWF45.The output goes to a passive audio filter; its bandwidth is 35 Hz on CW and 200 Hz on RTTY. The output from the filter is fed to ex-WW II headphones type DLR 5 and to the Y-input of an oscilloscope. The deflection is adjusted to a suitable value by means of the manual gain control of the receiver (which has no AGC), being careful not to overload the RX. Next a HP signal generator type 604B is substituted for the aerial, tuned in for maximum signal and its output level adjusted for the same deflection on the scope as produced by the received signal. The signal strength in dBm is then read from the signal generator.
I did use the selective level meter on the carrier of DCF139 between bursts of data. The result was exactly the same as found by the substitution method. A useful cross check. I measured the signal strength of DCF139 with my home made field strength meter in an open field near to our house where there no underground cables, pipelines or other disturbing objects. I measured 1.66 mV/m, or 64 dB(uV). The input to the receiver at that moment was -33 dBm. So the field strength in dB(uV)/m can be found by adding (64 + 33)=97 dB to the input of the receiver in dBm.
For the S-report I applied the IARU recommendation: S9=-73 dBm and 1 S-point=6 dB. I used the expression (S + dB) also below S9 to avoid loss of information due to rounding. A description of my home made field strength meter and its calibration can be found at www.picks.f9.co.uk/pa0se/htm or www.lwca.org/library/global/pa0se/fsm.htm.
73, Dick, PA0SE