G3WKW ( Hampshire 135km) and I exchanged 2m WSPR reports eventually a few weeks ago . Since then, Bob has fixed a very stable reference to his rig to remove drift so we are currently repeating the test, this time using vertically polarised antennas. My V2000 vertical has considerably more gain than my horizontal halo whereas Bob has much less gain. We may swap back to horizontal later. Bob is using 10-20W and I am using 2W.
I see G4SMX has spotted a German (DB0XIT) on 2m WSPR this afternoon at 453km and an ON station even copied GI earlier. Despite the strong Doppler, stations ARE managing long ranges on 2m WSPR.
UPDATE 2300z: 2 decodes of G3WKW at 50, then 20W and LOTS of traces with LOTS of Doppler that would not allow decode. My 2W to halo seen by G6AVK (78km) tonight but no decodes (yet) at G3WKW. These were with horizontal polarisation.
1 Feb 2014
31 Jan 2014
The last 24 hours on 472kHz RX
Not having a suitable TX antenna for 472kHz I have been WSPRing (RX only) on the MF band using my untuned Par 10/20/40 end-fed antenna. In all, 10 unique stations were spotted including F and DL.
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| 472kHz unique RX WSPR spots over the last 24 hours with untuned Par antenna |
A new 5MHz band?
At WRC-2015 one of the possible discussion points is new 5MHz ham band to replace the messy channels allocated in some countries. Although I have held a 5MHz NoV for some time I have still to transmit at 5MHz.
One of the downsides of WRC-2015 is the possibility of losing access to the 10GHz band.
All these decisions are a long way off but your national society may get a chance to comment on proposals. Take the opportunity to add your voice if these decisions matter to you.
One of the downsides of WRC-2015 is the possibility of losing access to the 10GHz band.
All these decisions are a long way off but your national society may get a chance to comment on proposals. Take the opportunity to add your voice if these decisions matter to you.
30 Jan 2014
472kHz WSPR RX
Rather than go on VHF, I decided to take a look at 472kHz WSPR after a break of over 4 months because of my illness. I have no MF antennas currently so just received on my untuned Par 10/20/40m end-fed antenna. The usual suspects (!) are still about and RX reports (I think) little different to those with the earth electrode antenna.
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| 472kHz band WSPR RX this evening to 2130z |
20m WSPR success
I am about to turn off my 20m 2W WSPR but results have been good, as an example 11 spots from a single transmission at 1802z with the majority of reports being transatlantic.
Crystal sets
It is some time since I built a crystal set, but these are great fun and very easy to build. Remember you are using the TX station for all power. There are no DC supplies in a crystal set.
Most designs are still for Medium Wave reception, but I had most fun with short wave designs based around T50-2 (red) or T50-6 (yellow) toroids which allow small hi-Q coils to be wound. Larger T68 or larger diameters are also suitable.
There are PLENTY of resources on the internet (just Google "crystal set" ) but a typical one is:
http://www.mds975.co.uk/Content/crystalsets2.html . Never assume crystal sets are useless: I have copied stations (not via relays) directly from all over the world including All India Radio, Radio Australia and Cuba. The short wave design used just a handful of parts. Signal levels will be in 500uV to 2mV region. A good crystal set design can detect down to about 400uV or less, but a lot will depend on your earpiece(s) and your ears. One has to ride QSB as some distant stations appear to be co-channel with less distant stations.
It would be fun to build a multi-band (LW, MW, SW and VHF) design some day. There are even designs for Band II FM using slope detection. They should work well on VHF aircraft band which is still AM with local airports and planes. I have never seen an aircraft-band design. You can always add a small audio amp, but this rather defeats the purpose of a crystal set.
See also my own website about crystal sets :https://sites.google.com/site/g3xbmqrp3/hf/crystalset .
Most designs are still for Medium Wave reception, but I had most fun with short wave designs based around T50-2 (red) or T50-6 (yellow) toroids which allow small hi-Q coils to be wound. Larger T68 or larger diameters are also suitable.
There are PLENTY of resources on the internet (just Google "crystal set" ) but a typical one is:
http://www.mds975.co.uk/Content/crystalsets2.html . Never assume crystal sets are useless: I have copied stations (not via relays) directly from all over the world including All India Radio, Radio Australia and Cuba. The short wave design used just a handful of parts. Signal levels will be in 500uV to 2mV region. A good crystal set design can detect down to about 400uV or less, but a lot will depend on your earpiece(s) and your ears. One has to ride QSB as some distant stations appear to be co-channel with less distant stations.
It would be fun to build a multi-band (LW, MW, SW and VHF) design some day. There are even designs for Band II FM using slope detection. They should work well on VHF aircraft band which is still AM with local airports and planes. I have never seen an aircraft-band design. You can always add a small audio amp, but this rather defeats the purpose of a crystal set.
See also my own website about crystal sets :https://sites.google.com/site/g3xbmqrp3/hf/crystalset .
73kHz band in the USA
In recent days and nights European LF enthusiasts have been looking, with some success, for the transatlantic transmissions in the 73kHz band from W4DEX and others who have been granted special permits QRSS60 transmissions have been copied well in Germany by Marcus Vester DF6NM and others. See http://dl.dropboxusercontent.
With the right kit (and stability) almost anything appears to be possible.
With the right kit (and stability) almost anything appears to be possible.
WSPRnet database was down
This morning, the WSPRnet on-line database has been out of action, so it is not possible to see who is receiving transmissions. This is a handicap of WSPR: when the database works it is a great asset and help, but when down for any reason, the whole fun of WSPR disappears. At best, WSPR is really a QRP BEACONING system, not really a 2-way communications system. JT65-HF and JT9-1 are ideal for QRP 2-way communications on HF.
As of 1500z, the database was still struggling - but there occasionally.
As of 1500z, the database was still struggling - but there occasionally.
29 Jan 2014
Health Update
I have now been out of hospital for almost a month following my stroke, so thought I'd better update you on progress.
Well the good news is my walking is coming along quite well. Although I still need a stick, the Zimmer frame is now almost unused. My wife and I do a 10 minute walk around the Close daily. A couple of weeks ago I managed a 1 mile walk at Anglesey Abbey (NT). My main issue when walking is giddiness. This is I believe improving. Another issue is feeling sick inside at certain times of the day. I sleep (usually) very well and for a long time at night. Getting around the home, even a stick is more for psychological support. I can get around OK apart from feeling giddy.
The BAD news is Community Stroke Support. I was told 1-2 week visits would be the norm, but I was, this week, told the waiting list is 13 weeks and I was 13th on the list! The CST refuse to leave messages on the phone and had I not chased them up, I would never have known my status! This part of my post hospital recovery is PATHETIC.
My experience is NHS clinical care is usually excellent but simple communications around the NHS is appalling. If this was the private sector and MY company several people would be SACKED without delay. Really, communications in the NHS is APPALLINGLY bad generally. This is my experience, my wife's and my daughter-in-law's. It HAS to improve. The sad thing is so little needs to change to make it good and save money and give patients and families a better experience.
I have written to the DVLA but don't yet know how long they will withdraw my driving licence, but I assume for 12 months. I now have a blue disabled badge which allows easier parking when my wife drives us to the shops and National Trust properties.
Swallow is slowly improving. I eat a Weetabix and banana at breakfast and pureed food lunch and tea. I am also on an 8 hour liquid feed.
Overall, I am making progress steadily on all fronts, still doing my exercises more despite the NHS than thanks to the NHS. My own doctor and local surgery have been excellent. At the current rate I can expect to be back to near normal health in the late summer.
Today, Thursday, I wrote an email of complant to the local NHS ,copied my MP, James Paice MP. I am pleased to report the NHS listened and I got some positive action this afternoon (speech and language lady coming to my home this coming Monday). It should not be necessary to do this to be heard. What if I was 85 and suffering from dementia?
Well the good news is my walking is coming along quite well. Although I still need a stick, the Zimmer frame is now almost unused. My wife and I do a 10 minute walk around the Close daily. A couple of weeks ago I managed a 1 mile walk at Anglesey Abbey (NT). My main issue when walking is giddiness. This is I believe improving. Another issue is feeling sick inside at certain times of the day. I sleep (usually) very well and for a long time at night. Getting around the home, even a stick is more for psychological support. I can get around OK apart from feeling giddy.
The BAD news is Community Stroke Support. I was told 1-2 week visits would be the norm, but I was, this week, told the waiting list is 13 weeks and I was 13th on the list! The CST refuse to leave messages on the phone and had I not chased them up, I would never have known my status! This part of my post hospital recovery is PATHETIC.
My experience is NHS clinical care is usually excellent but simple communications around the NHS is appalling. If this was the private sector and MY company several people would be SACKED without delay. Really, communications in the NHS is APPALLINGLY bad generally. This is my experience, my wife's and my daughter-in-law's. It HAS to improve. The sad thing is so little needs to change to make it good and save money and give patients and families a better experience.
I have written to the DVLA but don't yet know how long they will withdraw my driving licence, but I assume for 12 months. I now have a blue disabled badge which allows easier parking when my wife drives us to the shops and National Trust properties.
Swallow is slowly improving. I eat a Weetabix and banana at breakfast and pureed food lunch and tea. I am also on an 8 hour liquid feed.
Overall, I am making progress steadily on all fronts, still doing my exercises more despite the NHS than thanks to the NHS. My own doctor and local surgery have been excellent. At the current rate I can expect to be back to near normal health in the late summer.
Today, Thursday, I wrote an email of complant to the local NHS ,copied my MP, James Paice MP. I am pleased to report the NHS listened and I got some positive action this afternoon (speech and language lady coming to my home this coming Monday). It should not be necessary to do this to be heard. What if I was 85 and suffering from dementia?
Excellent amateur VLF reception
OK2BVG has been having very good results on 8.270kHz picking up Uwe DJ8WX. Note timescales of the plot are in many hours. The wideband noise blocks are nighttime when reception is more challenging.
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| OK2BVG's reception of DJ8WX on 8.270kHz |
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