My NoV for 500kHz came through yesterday, authorising 0dBW ERP, modes FSK, PSK, MSK and TBD just as I'd asked for. It also allows ASK, but didn't specifically request that :-) This morning got the 7m
ps I've started a grabber showing 503.5 - 504.1 and also I notice strong traces on the WSPR waterfall at 503.900 from I believe M0BMU, but very few decodes? I don't usually have a problem with Jim's
The figures won't go below 0dBm so they will no longer be a true representation of tx power. WSPRnet is still reporting several listeners copying my sigs, now at -28dB S/N, so will continue decreasi
I didn't say that. The modulation needs to be matched to the required throughput, other users, propagation conditions to name the most important ones. At the moment, both those modes appear to be par
Jim is 10 - 11dB SNR apart from the transmission at 1622 when there was a dropout of some kind in his signal Was about to say there's QRM on Jims signal (at 1639z), but its that funny on-off mode, de
I thought I'd set an ERP of 25dBm in the setup, will have to check... My ERP is around that figure when hitting antenna with 80 Watts. Not too happy with the WSPR windoze software. The COM port opera
Went to PSK31 for a one way QSO with G0API a few minutes ago. Dropped to 503.4 for that so hope it didn't splatter your reception of JIm. Andy G4JNT www.g4jnt.com
Amateur bands are typically 2 to 10% of their centre frequency, so lets take a figure of 5%, giving a useable band 95uHz wide. Allow a waveform that criutically fits inside this bandwidth - OFDM or M
But have you thought about the power DENSITY. Its a well known fact that spreading a signal in frequency improves channel usage and assists weak signalling - go back to Shannon's eqn. Look at first G
Is there some sort of unofficial bandplan on this band? I'm rather late coming on to it having only got the NoV last week, and haven't followed the reflector over the last year or two (microwaves wer
Does anyone have a copy of an electronic version of the NoV application form? The .PDF on the Ofcom website looks to be a standard doc for printing and filling out by hand. Not having handwriting fon
If you have a radio with adjustable CW mode like most SDRs, and the RA1792, its easier to use CW mode. Tune to the centre frequency of interest, set the filter appropriately and the BFO to the decode
I've just applied for an SRP for 501kHz, and noticed on the RSGB Spectrum Forum website, the existing extension was only until Feb 2009. Is there any update on that? Andy G4JNT www.g4jnt.com
Quite likely Schottky diodes. Much lower forward voltage drop - typical 0.15 to 0.3V at rated current, and OK for fasr SMPSUs. Reverse leakage can be very high. Andy G4JNT www.g4jnt.com
