Grab 2 - 504.4 to 510.0 kHz is using a Softrock Lite SDR and a Mini-Whip active antenna designed by Roelof PA0RDT at about 9 metres. The capture software is Spectrum Lab produced by Wolf DL4YHF. The upload carried out using Argo-Upload written by Rik ON7YD. The screen shot may at times be disrupted depending on what is going on in the shack. Upload is set at 5 minute intervals and auto refresh at 3 minute intervals.

Grab 1 - 499.0 to 504.4 kHz is using a Softrock Lite SDR and a Mini-Whip active antenna designed by Roelof PA0RDT at about 9 metres. The capture software is Spectrum Lab produced by Wolf DL4YHF. The upload carried out using Argo-Upload written by Rik ON7YD. The screen shot may at times be disrupted depending on what is going on in the shack. Upload is set at 5 minute intervals and auto refresh at 3 minute intervals.

Grab 3 - 503.7 kHz Beacon From G4JNT is using a JRC NRD-345 receiver and a Mini-Whip active antenna designed by Roelof PA0RDT at about 9 metres. The monitoring software is the 5Mhz Beacon monitor program v3.12 written by Peter Martinez G3PLX. The upload carried out using SyncBack v3.2.19.0 by BrightSparks. Upload is set at 15 minute intervals and auto refresh at 3 minute intervals.

The red trace is Andy’s (G4JNT) 503.7kHz beacon at the quarter hour + 4 minute intervals, using the same Tx format as the GB3RAL/WES/ORK beacons which operate on the 5Mhz band, although the pulsed sounder has been replaced with a PSK31 transmission on Andy’s. The green and blue slots are available for other beacons at the quarter hour + 5 and + 6 minute intervals, the black is the noise measurement.

Beacon description at :-        http://groups.google.com/group/uk500khz/web/multi-function-beacon-by-andy-g4jnt

The monitoring software and more information is available at :-
http://www.rsgb.org/spectrumforum/hf/beaconauto.php     and     http://www.rsgb.org/spectrumforum/hf/5mhz.php