30 Apr 2010
Shack repainting
Just got back from a few days in Brittany and straight into DIY! The small bedroom used as the operating shack, and a bedroom for my little grandson when he comes to stay, was in need of a repaint, so everything was removed and the whole room is being repainted. All being well, the radio gear should be operational again by Sunday.
25 Apr 2010
8.97kHz RX started
Today I made the loop antenna for the front-end of my 8.97kHz receiver. This consists of 24 turns on an 80cms square frame (the most I could wind with the 0.2mm PVC covered wire I had). Next stage is to resonate the loop and add some gain and selectivity so it can be used with a PC based SDR such as SpectrumLab or with a stand-alone direct conversion receiver.
24 Apr 2010
My 2 year old grandson's CW
My grandson trying his hand at CW - despite being only 2yrs 5 months old!
Further 8.97kHz earth-mode tests
All being well, I'll be carrying out some more earth-mode (through ground conduction current) WSPR and QRSS tests on around 1kHz and 8.97kHz in about 10 days time. My aim is to achieve a new personal DX record for the mode using about 4W. My previous best distance is 0.3kms, but I'm pretty certain that with QRSS or WSPR this can be bettered. Remembering an earlier post, 18dB more system gain is needed to double distance using this mode of propagation. This can be achieved by raising TX power or effectively improving the RX sensitivity, in this case mostly by better filtering and signal processing.
Got my shack back
G3RJV QRP lecture on the BATC streaming site
A talk called "QRP Why and How" by G3RJV is available now on the BATC website. Go to http://www.batc.tv/ and click on the 'Film Archive' icon and select "G3RJV QRP Lecture" from the drop-down list on the left hand side. The BATC site has a wide choice of videos available to view on-line as well as streamed outputs of amateur TV stations and repeaters.
23 Apr 2010
Sporadic-E season
As we approach the end of April, the first signs of the summer sporadic-E season will be appearing with decent, strong openings to Europe from the UK on the higher HF bands plus 6m, 4m and occasionally 2m. Every year there are also multi-hop openings to much greater distances such as the USA, Middle East, Caribbean and South America. This year, more stations will be using WSPR beaconing on these bands, so even fleeting openings will be noticed. My plan is to WSPR beacon on 6m whenever around and not working stations using QRP on 10m or 6m. It will be good to see some remarkable 6m DX on the WSPR database.
20 Apr 2010
Volcanic ash and propagation
My son, his wife and 1 year old son are currently stuck in Los Angeles: all came down with a virus and were unable to travel back to the UK after a 2 week holiday. Not that they could have flown anyway, because all the planes were cancelled as a result of the Icelandic volanic ash. They are now stuck there until May 1st, the next available flight, and that is assuming the volcanic ash is not an issue then.
An upside of the flight ban are the beautifully clear blue skies in the UK completely devoid of vapour trails for days now. Not sure what effect, if any, this has on VHF/UHF tropo or even sporadic-E conditions.
19 Apr 2010
DX birds: swallows have arrived
This morning I saw that the first swallows of the spring had arrived in our village. The swallows fly from Southern Africa all the way to Europe every spring arriving between late March and the end of April. Many nest in the same nest for years and years. The returning swallows, house martins and swifts remind me that this magical journey has been done for thousands of years and that we humans are just one small part of the Earth's diversity.
18 Apr 2010
New 80m AM transceiver kit from Small Wonder Labs
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