500kHz WSPR

Yesterday I fired up the 500kHz WSPR kit (2mW ERP from the loop antenna) for the first time in several months and was pleased with the reports and level of activity. Several people joined in the fun and some new stations are now monitoring and reporting on the band. I want to get my 137kHz WSPR kit sorted this week with around 25W RF and maybe 0.5mW ERP if I am lucky.

Sunspots update

As the days go by this autumn, the sunspot numbers continue to climb progressively and I am beginning to think we may be in for a decent cycle 24 peak after all. Certainly HF conditions have been excellent recently with MUFs up to 40MHz at times.  28MHz has been as good as I ever remember it in the last few weeks.

Have there been any recent revisions of the sunspot predictions for the next 12-24 months? If so, I would expect these to be upwards.

CQWW: update on 10m operation

After a few hours of intermittent QRP operation I've plenty of QSOs in the log, many when using just 500mW pep into my halo antenna. Stations have been worked with QRP in 5 continents on 28MHz SSB already. The band is almost filled with stations in a way that I've not heard since the last sunspot peak. If you want to work some QRP SSB DX on the HF bands, especially on 10m, then this weekend is your opportunity.

CQWW SSB Contest this weekend

This weekend it is the BIG contest of the year - the CQ Worldwide DX contest (SSB) which runs all of Saturday and Sunday. Unless the sun plays nasty tricks, all the HF bands will be absolutely humming with SSB activity and for 48 hours the bandplans will be thrown into chaos as SSB stations spread out to find space.  I am not a great contest fan, but I do enjoy this one and, almost without fail, manage to work loads of US states on the higher HF bands despite running 5W pep or less. This year on 28MHz there is a good chance of working some USA stations with 100mW pep or less, especially later in the contest.  Last year I was unable to take part as we were away. This year I have told my wife that I am not available for anything else.

IC703, K1 and MFJ Cub (15m) possible sale

The above QRP rigs, all of which are in good condition, are part of my station but very underused compared with the FT817 and my homemade gear. So, I am thinking about selling these and at a fair price. The 5W K1 has the 40,30,20 and 15m band module as well as the auto-ATU internally. The IC703 covers 160-6m at up to 10W. The Cub is 1W on 15m.

My question is what IS a fair market price to charge for each? Please note these are NOT yet for sale and I am only trying to judge what sort of price to charge if I do decide to do so.

XBM10-2 Micro-transceiver boxed

This afternoon I rebuilt the XBM10-2 28MHz micro-transceiver onto a small piece of copper laminate and put the whole transceiver in a small diecast box. The transceiver still chirps far too much, but it is in a state where more DX contacts will be possible and I can't see an easy way of reducing the chirp without making it more complex. Maybe I should call it the Chirpy-10?  I'm particularly pleased that the TX-RX offset is just perfect for operation on 28.060MHz CW.

I have just realised that by replacing the earpiece with my PC soundcard I can use several SDR packages to allow me to look either side of the QRP calling frequency. This rather defeats the simplicity though!

Getting the shack back

Tomorrow evening my house grows about 200% in size. Actually my 2 delightful young grandchildren and their mums and dads go home meaning I can restore the shack to its main use! At the moment it is a bedroom for the two grandchildren, so amateur operation is impossible. One thing on the agenda is the CQWW SSB contest at the weekend. This is one of the contests I enjoy as it is a good way to work lots of US states and Canadian provinces, even with 5W QRP. Another task is to further optimise the XBM10-2 tiny transceiver, put it in a tiny case and work some more countries with it.

2 countries worked with the 28MHz XBM10-2

Well, off to a good start today with a couple of QSOs with the 2 transistor XBM10-2 60mW 10m CW transceiver. Much to my surprise I got 439 from IT9QAU/QRP at 1547z today.  Distance was 1414km.

Then 599 (with chirp) from M0DRK, who is in the same village as me. So 2 DXCC countries worked already.  On receive, the oscillator will not always start in the latest circuit version in which I've reduced the component count by a further 2 parts (just 11 parts plus crystal and earpiece now).  Still, a very promising start for something so ultra-simple.

UPDATE 1850z 20.11.10: To get the oscillator to always start on RX, to get TX spot-on 28.060 with the right offset for RX I had to revert to the earlier design and put 2 parts back. The revised schematic is shown here. This IS such fun.

2 transistor transceiver for 28MHz CW

This afternoon I built what is probably just about the simplest CW transceiver possible for use on 10m. Based on my XBM80-2 design for 80m, this is essentially the same circuit redone for a 28.060MHz fundamental crystal.

Depending on how much chirp one is prepared to accept (there is quite a bit) the power output is around 50-70mW, which is enough to cross the Atlantic on a good day. With less output the chirp should be reduced. The receiver audio output into the high impedance crystal earpiece is low, but I can hear down to around 2uV (-100dBm) in a quiet room. The circuit is a colpitts oscillator used as a TX oscillator with the key down and as a direct conversion receiver with a single stage oscillator-mixer and separate audio gain stage with the key up.

The rig is full break-in going from RX to TX when the key is pressed. It works as I have already heard Ws on the band today. Broadcast breakthrough does not seem to be an issue. I hope to have a few local QSOs soon, but really believe it will get much further.  It could do with tidying up and boxing and it really needs a small low pass filter for serious use.

More WSPR database issues today

28MHz WSPR this afternoon - loads of signals

Sadly this afternoon the internet WSPR database crashed again, just at a time when 10m propagation was excellent and some decent reports were coming in from the USA and elsewhere with my 50mW to the halo. All afternoon I was getting an endless string of DX stations coming through on WSPR all running 5W or much less but I have been unable to upload these to the database or get my own reports from it. I noticed G4KPX about 15km away from me was testing on 10m WSPR with 5mW and I am sure he would have been getting plenty of DX reports in today's conditions. Let's hope the database is back soon so I can upload spots manually and see what reports I was getting in the last few hours.

My other blog: Miscellaneous Musings

There are times when I want to speak my mind or share thoughts on matters unrelated to amateur radio. Rather than post these here in future, except in exceptional circumstances, I've started a new blog called Miscellaneous Musings which will cover all manner of subjects. Feel free to follow me there too and make comments.

http://qss2.blogspot.com

10m AM DX QSO today

Today I had a nice solid AM QSO across the Atlantic to K2WF in Long Island on 29.010MHz when I was running just 4W to the halo antenna. My report was 55 and I gave Alan 57. He was running 25W carrier. This is my first 10m DX AM QSO in about 10 years and very welcome too.

Nostaglia - listen again to famous shortwave interval signals

If, like me, your first experience of short-wave radio was listening to DX broadcast stations back in the 1950s or 1960s on a simple home built radio you may want to take a nostalgic listen to the recordings of a large number of the interval signals from those far-off days. Even now, those evocative tunes send a shiver of excitement down my spine.  Some browsers may not like the link which is to my public Dropbox folder, but I assure you it is safe.

Superb HF conditions - sunspot count is high

Yet again, 28MHz is buzzing with signals right across the whole band with stations simultaneously coming through from the Far East and the USA. The sunspot number today is 166 which is very high. If the sunspot count and flux levels remain at this level or increase further in the next 12 months I think it is highly likely the peak will be a pretty good one, despite many predicting this would be a weak peak.

What I am hoping for now are some 6m transatlantic openings this winter. I well recall previous good peaks when 50-50.2MHz was filled with Ws and VE stations booming in at 59 on just a small wire dipole.

The Voice of the Common Man/Woman

This picture appeared on my Facebook pages today. It shows someone on one of the marches across the world protesting at bankers and the mess they have caused.  I think it is excellent and speaks volumes about the concerns of good, decent and ordinary people. Stupid bankers have gambled away OUR pensions and OUR livelihoods for the sake of THEIR short-term gain. Power to the people!!

29MHz AM Signals

For the first time in several years I am hearing 10m AM signals coming through from across the Atlantic between 29 - 29.1MHz. Good signals from N1GKX and KA1CU amongst several others including UA and G. For me, 10m AM is like a time warp, reminding me of how the HF bands used to sound in my youth back in the early 1960s. Yet to work any DX AM this season.

Wonder why the economy is in a mess?

"Virtually all U.S. senators, and most of the representatives in the House, are members of the top 1 percent when they arrive, are kept in office by money from the top 1 percent, and know that if they serve the top 1 percent well they will be rewarded by the top 1 percent when they leave office. By and large, the key executive-branch policymakers on trade and economic policy also come from the top 1 percent."

This is a quote from a recent article in Vanity Fair.

A similar situation exists here in the UK. In my view this is a situation which cannot be sustained and we need to wake up and do something about it.

A VHF/UHF DX mode waiting to be discovered?

There is some indication that the long Europe to Japan path on 50MHz in the summer months is due to Polar Mesospheric Summer Echoes, or PMSE for short. Echoes of 224MHz radar in Norway suggest strong reflections, so I wonder why more radio amateurs are not trying for 2m DX using these mesospheric clouds?

See http://www.eiscat.se/raw/pmse.html. It is very likely these clouds and noctilucent clouds are the same phenomenon.

More success on 28.060MHz QRP

In the last few days I've been putting out more CQ calls on the 10m CW QRP frequency. This tactic is working as I've managed several decent QRP-QRP QSOs across the Atlantic including 8P6BX,  W3PO,  K1YAN and N0UR. HF conditions are certainly very good of late and 10m is back to its old ways when a few watts are all that is needed.

Steve Jobs - RIP

Today is a sad day for the electronics and computing world with the death of Steve Jobs of Apple. Not too many years ago Apple looked like simply fading into obscurity. Then Jobs came back and turned it all around. All my family have Apple products - PCs, iPads and, in my case an iPod Touch 4g. All work perfectly and are a credit to an innovative and creative company led by people with inspiration and vision. We need a few more people like this in the UK rather than giving credit to idiots in the banking and "investment" world who simply gamble our pensions and reap huge bonuses as a result.

RIP Steve.

Crossing the Atlantic again with Sputnik TX

My CQ call today on 21.060MHz (using G6ALB's 400mW Sputnik valve TX) resulted in a reply from Jim W1PID who was 549 initially but he faded out before I copied my report.

Sputnik valve TXs on air this week

All being well, for a few days starting October 4th I shall be on 21.060kHz using G6ALB's "Sputnik" valve TX which puts out 400mW. Several other stations around the world will be running similar rigs and with luck we will manage a few Sputnik-Sputnik QSOs. DL2BQD will certainly be on and also, with luck, some transatlantic propagation will be possible.

A decent 500kHz allocation a step nearer?

From a post on the GQRP Yahoo group....

"On the IARU Region 1 website Colin Thomas, G3PSM, reports on progress in Mainz towards an Amateur Radio allocation in the vicinity of 500 kHz.

WRC12 Agenda Item 1.23 says "To consider an allocation of about 15 kHz in parts of the band 415-526.5 kHz to the amateur service on a secondary basis, taking into account the need to protect existing services;"

The CEPT Conference Preparatory Group Project Team C (CPG PT C) meeting took place in Mainz, Germany and Colin Thomas, G3PSM, reports:

At its meeting between 26 and 29 September, 2011 the CEPT project team approved a draft ECP for an 8kHz-wide band between 472 and 480kHz. This draft ECP now goes to CEPT's Conference Preparatory Group for formal ratification in November. This breakthrough, at the 11th and final meeting of the project team, occurred with the submission by the UK's Ofcom of an RSGB-drafted compromise ECP proposal supported by France and Sweden. But the prospect of an agreed CEPT position is good progress, representing a 48 country block vote going into next year's WRC-12. It needs to be noted that the draft ECP comes with significant caveats to avoid interference to the primary user, as well as the existing secondary user services. These are the maritime and aeronautical radionavigation services respectively. As secondary users we would also not be afforded any protection. It should be acknowledged that we have had support from a number of Region 1 national societies in getting to this position."

Hospitals and life's (nasty) surprises

Yesterday we had a sudden shock when my wife was rushed into Addenbrookes Hospital in Cambridge suffering from severe back pains and sickness. The day before she had been fit and well. She has been diagnosed with acute cholecystitis and is now on intravenous antibiotics and drips.

As Julian G4ILO has recently found, life has a nasty habit of suddenly throwing a spanner in the works, usually just when things are going very well. Hopefully she will make a full recovery although she has to have her gall bladder removed in the next 6-8 weeks.

....and I haven't a clue how to drive the washing machine :-)

Reverse Beacon Network - brilliant resource

A couple of times in the last few days the Reverse Beacon Network (a worldwide network of receiving stations automatically uploading spots to to the internet) has come to my aid. Today for example: a couple of CW calls on 28.060 with 5W to the halo got no audible replies, but a RBN report from PJ2T in Curacao in the Caribbean at 10dB S/N on CW proved my signal was getting a very long way.   A few days ago I found my brief call had been copied in K3 land (that's the call district and not the Elecraft factory)..

Sputnik across the Atlantic today

The "team" today

This afternoon Andrew G6ALB, Ted G4NUA and I got together to finish building the "Sputnik" transmitter for 15m based on old Russian valves of the same type used in the first Sputnik satellite in 1957. These were given to us by AA1TJ. Andrew G6ALB did all the building work but I was the "air tester" as his CW is, he says, worse even than mine.

After a few false starts with the PSU arrangement we fired up the transmitter into Andrew's inverted-L antenna and had almost immediate success with a QSO (following our CQ) with K1GDH (Ed) near Cambridge USA who was running 5W and gave us 539.

From Andrew:

Our power out was 400mW.  PSU was nominal 24V AC @ 500 mA plug top followed by doubler for about 74V no load and 72 on load.  Grid Block keying uses -36V rail.  In all 3 diodes, 3 caps, 3 bleed Rs.  Very simple, fairly safe also. Filament supply is 5V DC plugtop [stabilised] and 18R resistor which gets warm!

A second Sputnik rig is being built now and all being well we will be on the air on Oct 4th (Sputnik Day) to try for some more QSOs.

Disappointing day on 10m today

Most of today 10m was relatively quiet here with just inter-G WSPR reports. I was about to switch things off when I noted a report from CX2ABP (11127km) just appeared. Maybe tomorrow conditions will be better.

10m - AMAZING propagation again today

Starting with reports of my QRP WSPR signal from VK6BN at 0640z, the day on 10m has been simply amazing. The band has been WIDE open to all continents today and sounded (almost) as good as I ever remember it. Several USA stations worked (with 59 reports) on QRP SSB. One report on WSPR from VK4 suggested just 50mW would have been enough to get me reports from Australia!

I just hope this upsurge in conditions lasts a while. Just maybe, the peak of cycle 24 could yet be a good one. An indication of conditions is how far above 28.5MHz stations spread out. Stations were spreading out to at least 28.6MHz on SSB and this is a weekday with no contests.

10m WIDE open - best for me in MANY years

Having just got back from France I switched on the FT817 on 10m to find the band wide open. Not that much on SSB (W4, 5B4 etc) but on WSPR with just 5W to my halo I was getting reports right away from the southern USA (-12dB S/N from W4DJW at 6537km and KB9AMG at 6300km). K9AN was giving me reports of +5dB S/N suggesting 5mW would be enough to cross the pond. Sounds like this autumn conditions are going to be excellent in 10m and possibly 6m.

UPDATE at 1845z: band still open to the USA, S.America and Europe. Just like the "good old days"!

Earth Mode VLF article in October RadCom

If things go to plan, there should be a 3 page article of mine in the October RadCom. As I am away in France I've no idea if this appeared or not.

IC7000, FT450D or KX3?

After many years I am thinking of upgrading my "main" HF/6m rig and these are my main options. Any views on which one to go for? I shall only use the rig for QRP mainly but a bit more power could be useful at times. VHF and UHF could be a nice addition with the IC7000 but the FT450D has better reviews. Of course the KX3 is some months away from production, especially in a CE approved European version. Ideally I'd like an FT817 successor, but this doesn't look likely before I die.

France

Enjoying a few days in the Perigord region of France with excellent scenery, history, food and wine. Rural France remains very unspoilt and beautiful. No ham gear with me at all though - too busy relaxing.

Nuclear Fusion - our energy needs met soon?

Nuclear fusion plant of the future

Are we getting close, at last, to making clean nuclear fusion, as opposed to dirty nuclear fission currently used in power generation, a reality? The BBC reports that the UK has joined a project with a US laser lab to work on the creation of powerful lasers to compress atomic nuclei to the point fusion occurs. See http://www.bbc.co.uk/news/science-environment-14842720. If this breakthrough can be achieved commercially it could radically change the outlook for the world. Growing energy costs prohibit widespread creation of water desalination plants, desert irrigation, electric cars and the like, but think what would be possible if energy costs became inexpensive and plentiful for ever. Global warming is only too real, but I have faith that with strong investment and push we will make nuclear fusion a reality in the next 30 years. This could well save the planet. The main dangers on the way are the vested interests of the US petrochemical companies who will do everything possible to bias US government policy in their favour, denying vital fusion research the funding it needs.

Success on 137kHz QRPp

 My 137kHz 0.2mW ERP signal by M0BMU at 69km

Today has seen some very encouraging results achieved on 137kHz with the QRSS30 0.2mW ERP beacon. Firstly copy from G4AYT in Whitstable Kent at 118km (in the null of my TX loop antenna) and excellent reception by M0BMU using his ferrite rod antenna at 69km - see screen shot. Several more stations are looking out for the signal which will remain on overnight.

LF kit improvements

24W 137kHz QRSS30 beacon TX (ERP 0.2mW)

137.5kHz 24W transverter (for WSPR) 0.2mW ERP

Today I completed the first stage of my ERP improvement programme on 137kHz completing the rebuild of the QRSS30 beacon and the transverter used for WSPR on the band. Photos attached show both of these. My ERP has now increased to around 0.2mW with both rigs. The output from the PA stage in both rigs is around 23-24W. More power will be easily possible by raising the PA supply voltage later.

Sputnik valve TX tests

This afternoon G6ALB and I got together to build a 2 valve 21MHz transmitter using a couple of Russian valves of the same types used in the original Sputnik 1 satellite in 1957. Surprisingly I've never built a valve transmitter before. Even today, Andrew did most of the building. My input was to wind a toroid and to help sort out the wire ends of the two valves. The valves were kindly supplied by Mike AA1TJ.  The breadboarded TX is shown in the picture. On a test this evening over the 3km path between our QTHs the 400mW TX was copied fine on my IC703 and 10m halo antenna.  Even at the lowest HT voltage (around 30V) his signal was still solid copy on the "Sputnik". Our aim is to have a pair of these units ready for Sputnik Day (Oct 4th) and to work each other and other more distant stations who are using similar rigs.  See also http://aa1tj.blogspot.com/2011/07/sputnik-qso-party-transmitter-prototype.html

Higher power on 137kHz

Today I did some work on increasing the output power of my 137kHz transverter used for WSPR, with mixed results. When driving the IRF540 PA with a decent square wave I can get around 24W out (was around 5-8W) from a 13.8V supply with decent efficiency. When using the drive from the mixed-down transverted signal I am having less success. The issue is driving the MOSFET gate from a really low impedance and ensuring it is as square as possible with the right mark-space ratio. Most 137kHz transmitters do this by driving at 274kHz with ICs designed to drive a pair of MOSFETs whereas I want to go in at 137kHz using discrete parts. This is a solvable challenge and I'll have this up and running in a few weeks. 25-30W would give me 6-8dB ERP improvement and more should be possible from a higher PA supply voltage. This would take my ERP up to around 0.5mW  ....heck that's high power for me!

More QRPp testing on 137.7682kHz

My QRSS30 137.7682kHz beacon is on until 0800z Tuesday morning sending XBM in QRSS30 with the full call at 10wpm periodically for full ID.  Reports (including no copy) would be much appreciated.  I'm hoping to improve on the recent best DX a few days ago - a report from G3WCB at 101km who got the signal pretty well at times despite the 140uW ERP.

CW training on the internet

If, like me, your morse code could be improved then you may like to go to http://lcwo.net/main and see the array of training material available there. It is probably the best place on the internet where you can brush up your skills.

Sunspots

At the moment we seem to be seeing quite impressive sunspot numbers, at last. See http://www.solen.info/solar/ . This bodes well for this coming autumn and winter which should see 10m well open to the USA on a regular basis by October. Such conditions offer the chance of transatlantic AM QSOs between 29-29.1MHz even with quite low power. In previous sunspot maximums it has been possible to work AM DX with just a few watts to a mag-mount on the car. AM makes a change from SSB.