More WSPR with 20mW

I've been WSPRing on 30m today, still with a power of 0.2W. I think WSPR is more interesting when you use low power: it's always interesting to see how far you can get.

20mW is not the lowest power you can use, though, it's just the lowest power the K3 will comfortably produce. (You can set the output power to 0.0W but I'm not sure how accurately the rig will maintain the power at such a low level - something to check.

Today my 0,02W into the MFJ magnetic loop in my attic was received by 30 different stations. Here's the list:

Timestamp	Call	MHz	SNR	Drift	Grid	Pwr	Reporter	RGrid	km	az
2014-01-13 11:52	G4ILO	10.140243	-11	0	IO84hp	0.02	ON7KO	JO21ce	637	124
2014-01-13 11:52	G4ILO	10.140209	-23	0	IO84hp	0.02	DL8HAF/P	JO53dm	899	92
2014-01-13 12:32	G4ILO	10.140206	-26	0	IO84hp	0.02	DK6UG	JN49cm	973	121
2014-01-13 12:54	G4ILO	10.140217	-22	0	IO84hp	0.02	DC5EO	JO31ed	760	117
2014-01-13 12:54	G4ILO	10.140210	-18	0	IO84hp	0.02	G8CRB	JO02bf	355	138
2014-01-13 13:18	G4ILO	10.140195	-19	1	IO84hp	0.02	G0GSJ	IO84jc	61	170
2014-01-13 14:20	G4ILO	10.140199	-19	0	IO84hp	0.02	G4ILR	JO02pp	379	124
2014-01-13 14:20	G4ILO	10.140224	-29	0	IO84hp	0.02	M0BLP	JO02ad	359	139
2014-01-13 14:30	G4ILO	10.140210	-20	0	IO84hp	0.02	OH8GKP	KP24rt	1945	43
2014-01-13 14:30	G4ILO	10.140203	-19	0	IO84hp	0.02	GM4SFW	IO77sn	331	349
2014-01-13 14:30	G4ILO	10.140199	-11	2	IO84hp	0.02	OH3HTI	KP21ag	1760	54
2014-01-13 14:30	G4ILO	10.140182	-13	0	IO84hp	0.02	LA5GOA	JO29oi	737	41
2014-01-13 14:38	G4ILO	10.140197	-23	0	IO84hp	0.02	OZ7IT	JO65df	1001	80
2014-01-13 14:38	G4ILO	10.140194	-13	0	IO84hp	0.02	SA6BSS	JO68	1084	60
2014-01-13 14:48	G4ILO	10.140189	-21	0	IO84hp	0.02	SM6WZI	JO67mp	1067	65
2014-01-13 14:56	G4ILO	10.140208	-21	0	IO84hp	0.02	DC8SE	JN48xi	1155	122
2014-01-13 14:56	G4ILO	10.140180	-7	0	IO84hp	0.02	ON7KB	JO21ei	634	122
2014-01-13 15:04	G4ILO	10.140204	-11	0	IO84hp	0.02	DK4TJ	JO31fc	768	117
2014-01-13 15:04	G4ILO	10.140236	-25	0	IO84hp	0.02	PA1GSJ	JO22da	586	117
2014-01-13 15:14	G4ILO	10.140238	-21	0	IO84hp	0.02	DL1WER	JN58dd	1189	122
2014-01-13 15:24	G4ILO	10.140195	-13	0	IO84hp	0.02	DL1KCQ	JO33uc	746	99
2014-01-13 15:36	G4ILO	10.140188	-25	-1	IO84hp	0.02	M5LMY	IO91oi	405	154
2014-01-13 15:36	G4ILO	10.140197	-12	0	IO84hp	0.02	PI4THT	JO32kf	729	107
2014-01-13 15:36	G4ILO	10.140196	-15	0	IO84hp	0.02	LA9JO	JP99gb	1949	26
2014-01-13 15:36	G4ILO	10.140191	-20	0	IO84hp	0.02	SM0FGT	JO89xg	1384	60
2014-01-13 15:36	G4ILO	10.140182	-12	0	IO84hp	0.02	LA5GOA/RX2	JO29oi	737	41
2014-01-13 15:46	G4ILO	10.140222	-12	0	IO84hp	0.02	DC0DX	JO31lk	776	113
2014-01-13 15:46	G4ILO	10.140215	-17	0	IO84hp	0.02	DC4LC	JN48np	1088	123
2014-01-13 16:22	G4ILO	10.140208	-17	0	IO84hp	0.02	DK4LA	JO54ae	868	88
2014-01-13 16:48	G4ILO	10.140196	-23	0	IO84hp	0.02	HB9FGQ	JN36kk	1163	137

Roger, G3XBM - get well soon

I was enormously pleased to see a new post from my fellow blogger Roger, G3XBM Roger is recovering from a severe stroke and  facing difficulties I can only imagine. I'm sure I'm not the only one missing his posts about QRP projects nd accounts of his low power activities. Get well soon, Roger.

Who says it can't be done?

I always like reading about what can be achieved using a stealth antenna system, so I always enjoy reading the blog of John, N8ZYA.

From a town house in Charleston, West Virginia using 3 watts of CW to an indoor random wire, John has made 1,830 contacts including 361 DX stations in 73 different countries. Simply amazing!

I hope you don't mind me pinching your picture, John!

The accidental QRPer

HF band conditions are not all that good at the moment. I was on 20m (in itself an indication that conditions on the higher bands are poor) and tried to call a couple of US stations but all I got was QRZ? I heard Jarda OK1DMZ calling CQ and he was a strong signal so I replied. Back came a 599 report. It was only when I sent the station details and sent my power that I realized I had it set to 5 watts!

I've lost count of the times I've found myself accidentally operating QRP because the rig was set to 5 watts after having been WSPRing at that power level. In better conditions I've made several contacts before realizing my mistake, which just shows that QRP does not always result in having a weak signal. But when conditions are like they are at the moment, power helps!

A good QRP site

Michel F6FEO sent me a link to his website. Many projects of QRP interest will be found there. The site is in French but Michel has provided Translate links for each of the articles. Definitely worth a visit.

What is QRP?

Over on the Elecraft KX3 Yahoo group an argument has been raging as to whether running low power into a tower-mounted beam is QRP. Some folk feel that QRP also means using simple no-gain wire antennas. Others argue strongly that using an antenna with gain is a perfectly valid way to do more with less, that "less" relates to power and nothing else.

On his QRP - Do more with less blog, Larry W2LJ nails his colours (colors?) firmly to the mast. Saying those who use towers and beams aren't QRP is baloney, claims Larry.

Personally, I think QRP is whatever the ARRL, G-QRP Club, QRPARCI or CQ Contest committee says it is. If you are competing in one of their contests or applying for one of their awards you must follow their rules. And the only limitation they specify for the QRP category is power level. So I don't think it is possible to win an argument that QRP includes any other restriction besides low power. But I can understand why some people feel that those who have a lot of aluminium in the air have an advantage over those who only use a piece of wire and that lumping them into the same category is unfair.

To really put the cat among the pigeons does the spirit of QRP include the use of store-bought or kit-built equipment too? I certainly feel that the art of QRP is strongly allied to the practise of home-brew, but I still claim to be QRP when operating my FT-817, KX3 or K2. Should the ham who operates an Elecraft KX3 belong in the same class as one who uses a two-transistor Pixie?

Perhaps we need a new term to define this kind of minimalist operation?

QRP Web Ring

For more years than I care to remember my website G4ILO's Shack has been a member of the QRP Web Ring. Web rings are a tool dating from long before search engines came on the scene and were set up to help web surfers locate sites of similar interest.

In order to be a member of the QRP Web Ring I include some links to other web ring sites on my home page, plus a banner.

Clicking some of the web ring links from G4ILO's Shack and other linked sites today I found that many of the links were broken and most of the rest were pages of extremely poor quality. So I am considering removing the QRP Web Ring code from my site.

Whether you still use the QRP Web Ring to find other QRP-related sites, or if you have never used it and have no intention of using it now that you know about it, I would appreciate your comments.

Looping the loop

Whenever I have taken a rig to operate in the Great Outdoors using a wire antenna I have often been disappointed. This is probably due to my use of inadequate antennas - Miracle Whips and the like. When I have tried wire I usually fail to get it up high enough. Usually when hurling a rock attached to a string into the trees, the rock rebounds off a branch and narrowly avoids hitting me on the head. If I do manage to get it up high the rock irremovably entwines itself with a branch just out of reach. There has to be a better way!

AlexLoop WalkHam carrying case

I have long been an enthusiast for magnetic loop antennas and have often wished I could use one as a portable antenna. My Wonder Loop was an attempt to make such an antenna, but it was less portable than transportable (by car) and has seen more use as a spare antenna from inside the shack.

I looked longingly at the WalkHam made by Alex PY1AHD and wished I could make a portable loop as neat and compact as that. If I had to make it myself it might never get done so I decided to bite the bullet and buy one of Alex's ready-made loops.

There are two versions of the AlexLoop. One is a kit using copper tube  for the radiating element and costs $199 US. The other version, called the WalkHam, uses stout coaxial cable for the main loop and comes ready built in its own custom made carrying case similar to a laptop case. The price of the AlexLoop WalkHam is $299 US. Shipping to the UK by express courier to the UK is a further $82 US. The total cost to me using PayPal was just over £250 at the present exchange rate.

AlexLoop WalkHam in its case

 The WalkHam is well made with gold plated connectors for the loop element. It is easy to assemble, though not so easy to pack away unless you have a photo to show how the parts go back! The mast is made of black plastic tubing and is in three push-together sections. Once assembled the antenna may be used whilst held aloft - hence the name. Most users will probably prefer some sort of mast.

The AlexLoop WalkHam ready for use.

The loop is 1 metre in diameter and tuned using an air spaced variable capacitor with a 3:1 reduction drive giving a 4 : 1 tuning range: 10m - 40m. Most magnetic loops including home-made ones only manage a tuning range of 3:1: 10m - 30m or 15m - 40m. My MFJ magnetic loop is the 40m - 15m version as it was bought during the last solar minimum when 12m and 10m were not much use!

The coupling loop has a diameter of about 20cm. The maximum power handling is 20 watts PEP, 10 watts continuous wave, making the WalkHam perfect for use with QRP radios like the FT-817 or Elecraft's new KX3!

Tuning as expected of a magnetic loop is extremely sharp but I noticed little or no hand-capacitance effect. With a little practice the loop can be tuned by peaking for maximum noise in the receiver. If the SWR isn't low enough then the tuning may be touched up using transmit and the rig's built-in SWR meter if it has one (both the FT-817 and KX3 do!) If not, a simple SWR indicator as I used in my Wonder Loop would be a big help.

Subjectively the AlexLoop seems to work as well as my MFJ magnetic loop in the attic, which itself is comparable to a full-size dipole. There are not many portable antennas that would beat the AlexLoop WalkHam for performance, unless you are able to erect a couple of 40-foot masts!

One thing that would improve the package would be a way of erecting the antenna so that it will stand on its own. I think my arm would soon get tired holding the WalkHam aloft! Possibly a short guyed mast made of sections of electrical conduit would do the job: magnetic loops don't need to be far above ground in order to work. Some users are reportedly using photographic tripods so I'll probably investigate that in due course.

Operatic debut

Nothing to do with Verdi or Rossini, nor the web browser of the same name. OPERA is a new weak signal digital mode that has been developed for use on the amateur LF (500kHz) and VLF (136kHz) bands.

Information about it seems to be a bit hard to come by, but there is an OPERA Yahoo group from where I presume you can download the latest version of the software. I managed to find a copy and was surprised at the sophistication of the program. It already has working CAT support for many transceivers including my Elecraft K2 and K3. It also has a built-in chat system showing reported signals from other users.

Although the new mode is apparently the invention of Graham, G0NBD, the program has been written by Jose Alberto Ros, EA5HVK, author of the ROS digital mode, and there are clear similarities in the user interface. The program supports all amateur bands from VLF to 6m but currently you can only select the frequencies 136kHz and 500kHz.

There are actually two OPERA modes, one of which is claimed to be even better (i.e. work with even weaker signals) than the WSPR mode. What is particularly interesting about OPERA though is that it does not need to use a sound card to send a transmission. Although the sound card is an option - and a convenient one for users already set up for data modes - OPERA actually (if I understand correctly) uses on/off keying, in other words CW (though not Morse code.) This offers the potential for long distance contacts to be made using ultra-simple QRPP (very low power) transmitters designed for QRP CW use - though I imagine that success depends on use of a very narrow bandwidth so you might need to pay more attention to transmitter stability than you would need for Morse code.) If the digital encoding scheme is published then it would also be simple to build microcontroller based beacon transmitters.

As I am not equipped to operate on the 500kHz or 136kHz bands I have been unable to try OPERA out on the air myself. But it certainly looks an interesting mode, especially if it is opened up to allow use on the HF bands where it could be used as an alternative to WSPR and QRSS CW modes.

Simple keyer trouble

It should have been simple. I needed a basic CW keyer that would allow me to use a paddle with my homebrew QRP / QRPP rigs because my shaky hands make sending Morse with a straight key too difficult at the moment. I also needed to be able to record a message and play it once or repeatedly until I heard someone reply or was spotted on the reverse beacon network.

A couple of years ago I built a DC20B QRP transceiver. I didn't like it very much and eventually sold it on eBay but I did like the keyer built into it which used an ATTiny13 microcontroller. One day, I thought, I would build a keyer using this chip. I got two of the Atmel chips and Steve Weber KD1JV sent me the hex file so I could program them but I never got around to doing anything more until a couple of days ago.

The simple keyer circuit uses only a handful of components but due to my condition it took a lot longer than it would have done pre-tumour to work out a perf board layout and build it. So you can imagine that I was a bit upset when after all that effort the keyer didn't work. It responded to the dash key and the function button, but not the dot key. Also the sidetone was very high pitched and the Morse speed was about 100wpm!

Thinking I had made a mistake programming the clock setting in the chip I tried programming the other one. This ended up just the same. Unfortunately with the simple keyer program you have to disable the reset pin that is used by the programmer so you only get one chance to write the code to the EPROM. But as I don't have the source code and so can't try modifying it that shouldn't have been a problem. If I hadn't sold the DC20B I could have tried the keyer chip from that, but now I am now stuck with no idea what to try next.

I have the code for another keyer that uses a PIC12F509A - the K9 from K1EL's freeware page. But I'd have to start over with the circuit board as the pinouts of the Atmel and Microchip microcontrollers are not compatible. The functionality of the K1EL keyer program is not what I was after either, so I don't feel much like trying it at the moment.

Link between radio use and brain tumours?

A news item in the December 2011 CQ magazine caught my attention yesterday. It reported that a Danish study of more than 350,000 people found no evidence of a link between cellphone use and cancer. Cancer rates have not increased during the time that cellphone use has become widespread. "That's good news" I thought.

However, some websites that reported the story carried the additional information that the Danish researchers found a hint of a link between heavy phone use and the rare but usually fatal glioma brain tumours - exactly the bugger I have. Not such good news after all, then.

Another study by Swedish researchers found an increase in cancer in areas of the brain exposed to microwave energy during a mobile phone call. Most of this data was from users of older analogue phones which run higher power and cause three times the exposure of newer digital systems. However that would still apply to use of VHF and UHF FM hand-helds which are typically operated at a power of 5 watts.

I think you would have to be an extremely active ham radio operator to expose yourself to as much RF as a heavy mobile phone user. But most hams are using much lower frequencies - though potentially higher power levels. Are the frequencies commonly used by hams more or less likely to cause cancer? I don't think anyone definitively knows the answer to that.

But it is certainly food for thought. I'd be more inclined now to use my HTs on low power or with a speaker mic so as to get the antenna further from the head. And if you must use indoor or stealth antennas that can only be sited a few feet from the operating position, life's too short for QRO!

Not so chirpy

Yesterday I attempted to have a QSO using the XBM-10-2 two transistor "Chirpy" transceiver for 10m. I asked Jim, G3XPD, who is about 8km south of G4ILO to listen out for me. Jim could hear the distinctive sound of my 100mW transmission, but I could not hear Jim, not even when he called using 100W.

I know the Chirpy receiver works because I can receive a locally generated signal such as my antenna analyzer. But I guess even that is a big signal compared to one received off the air. I need to find a way to improve the receive sensitivity if it is to be possible to make a real two-way contact using this simple transceiver circuit.

I have tried adjusting C2 for maximum noise in the earpiece rather than maximum output when the key is down, to see if that gives some improvement. If nothing else it seems to have tamed the chirp a bit.

Feeling chirpy

Not without some difficulty due to my shaking hands, I managed to modify my copy of Roger G3XBM's XBM-10-2 two transistor transceiver for 10m to his latest version. It is now named the "Chirpy" for reasons that will become obvious when you hear one on the air.

My version is exactly the same as Roger's except that R3 is a trimpot not a fixed resistor. This allows me to adjust the power output to what I want. I am getting 150mW output on a 13.8V supply, this drops to 50mW with a 9V power source.

So far I have yet to make a contact with the little rig. I have called CQ on 28.060 many times but my signal is yet to be spotted on the Reverse Beacon Network. I don't know if that is because my signal is too weak or too chirpy for decoding by the skimmer stations. Or perhaps the skimmers don't receive that far up the 10m band. I will probably have to arrange a sked with a local station who is near enough to hear me.

Two Transistor Tranceiver for Ten

With ten metres opening up it seemed the right time to try building Roger G3XBM's latest project: the XBM10-2. Roger describes it as probably just about the simplest CW transceiver possible for use on 10m, using just two transistors to produce about 60mW out.

This was my first attempt at construction since my radiotherapy and chemotherapy and I found it to be quite a struggle. First of all I found it difficult to concentrate while trying to work out the perf board layout. After that I got a bit frustrated with constantly juggling three pairs of spectacles due to my eyes apparent inability to focus at different distances. I also found soldering difficult due to my hands shaking whenever I brought the iron bit close to a component. I created quite a few solder bridges which I then had to clean up.

Construction took much longer than I would have taken a few months ago. But in the end it did work. Though not on ten metres yet. I'm waiting for a 28.060MHz crystal from the G-QRP club shop before I can try it out on the air.

One issue I have found (which Roger also comments on) is that the rig has a major chirp. It is definitely not T9 and I don't know whether it is possible to improve on that. But at least it has character. If you hear a weak, chirpy signal near to the 10m QRP activity frequency give it a call. It might be me!

VK on a whip antenna

The amazing power of the WSPR mode to enable weak signals to be received over long distances was demonstrated conclusively when my 2 watt signals, transmitted into a 1.3m long telescopic whip antenna from inside the G4ILO shack,were received in Australia and the USA, not once but several times with SNR reports of up to -19dB.

These spots were not achieved using a hand held radio as they occurred early in the morning when I was asleep. But they were made using a home made portable 30m whip antenna that I designed to be used with the VCXO-AXE portable WSPR transmitter I recently built. Here is a picture of the antenna taken during the tests.

The antenna consists of an L-match mounted in a small plastic project box, with BNC sockets for the transmitter and the whip antenna.

The constructional details can be gleaned from this internal view here. Click the image to see a much larger version.

The loading coil consists of about 46 turns of 28SWG wire on a T80-6 toroid. The matching capacitor is a 4 - 40pF trimmer. The number of turns was determined empirically (i.e. using trial and error) so don't ask me for details of how to make one for other bands. There may be formulas for calculating things like that but I don't know them.

It would have been difficult to make this antenna without an antenna analyzer like my RigExpert AA-200 which displays the SWR across a range of frequencies graphically. With my first attempt at the inductor it was possible to obtain an SWR null at 10.140MHz but it was rather a broad dip and the minimum was around 3:1. However at lower frequencies I saw that I was able to obtain a much deeper, sharper null. This made it clear that what I needed to do was remove some turns until the deep, sharp null was at the frequency I wanted. A deep null indicates higher Q and therefore better efficiency.

You can see the SWR curve of the final version below.

Note, however, that this was taken inside the shack in the test position where reflections spoiled the SWR and broadened the dip. When measured out of doors the SWR curve dipped deeper and was narrower as long as I stood clear of the antenna. (It was interesting to note how the SWR was affected even if I was a metre away from the telescopic whip. This suggests efficiency would be adversely affected when used in true hand held fashion.)

A good ground or quarter wave counterpoise wire is needed with this antenna. The resonant frequency is affected by the ground system used as well as the length of the whip and the position of the trimmer. If you don't want to take an antenna analyzer to the field to check and tune the antenna before operation you should use the same counterpoise. So it would be advisable to pair the counterpoise with the antenna.

Further tests would be useful to determine the extent to which a good match is reproducible in different locations using the same whip length and counterpoise without retuning.

In case retuning is needed I added an access hole for the tuning trimmer. The resonant frequency can also be changed (increased) by shortening the telescopic whip a section or two.

This has been an interesting project. As a result of it I now have a completely portable, pocketable, battery powered system capable of sending a radio signal half way round the world, and I have developed a useful monoband 30m antenna.

Should I or shouldn't I?

Thanks to the latest blog post from John AE5X I have the web page for a new QRP kit open in another browser tab and the pointer keeps hovering over the Buy Now button. The kit in question is the TJ2A, a two-band handheld SSB/CW transceiver for the 20m and 40m bands that has just been produced by YouKits of China.

Regular readers of my blog will know of my fondness for handheld radios. I'm finding this one very hard to resist even though I have an FT-817 and so no need for another handheld 20m/40m radio. At this point in my life I'm not even sure if building it is still within my capabilities. If I did try, it would be the most difficult kit I have attempted since my Elecraft K2, and I built that 12 years ago when my eyes were a lot sharper and I was not suffering the after effects of a brain operation. Should I or shouldn't I?

The TJ2A looks like an updated and improved version of the Mizuho HF handhelds that were produced during the late 1970s which still fetch a tidy sum whenever they change hands on eBay. Like the Mizuhos, the TJ2A is VXO controlled and covers a portion of each of the two bands, though you can install alternative crystals if you would prefer to have full coverage of one band in two ranges. You could also choose other bands by changing the VXO crystal and bandpass filters.

The building instructions are on the web and it looks as if the kit uses mostly through hole components but there are some SMD transistors. It isn't perfect. There is mention of warm-up drift in the first 5 minutes after switching on or changing bands. There is also a mod already to stop BFO leakthrough into the IF stages. And there doesn't appear to be any high SWR protection for the PA so using the rig with handheld antennas - or any type of antenna that presents a mismatch prior to tune-up - might be problematic.

But it looks really cute. And it's a kit. There are few things in ham radio more rewarding than hearing the first signals, then making the first contact, on a radio you built yourself. Should I or shouldn't I?

Whispering with a VCXO-AXE

My VCXO-AXE WSPR transmitter kit from W5OLF came this morning. It was two weeks in the post, doubtless due to Customs which had opened the package. I wasted no time in building it, though it did take me somewhat longer to complete than it took AE5X.

The kit itself has been impressively put together. The PCB is extremely high quality and the instructions are almost of Elecraft standard. If the horrible Spectrum Communications Off-Air Frequency Standard kit had been produced to this level of quality it might not have turned out to be a failure for me. If American kit makers can produce nice silk screened and solder masked boards, why do ours make us struggle with boards that look like they were made by hand on somebody's kitchen table?

The VCXO-AXE kit uses almost all through hole components and there is plenty of space around the solder lands. I doubt that anyone would have any trouble building this. The one part that induced a feeling of terror when I saw it was the VCXO itself.

As described, it is a "larger surface mount component." But what I didn't expect was that it didn't have any pins or legs that stick out to solder to. Instead, you have to solder it so the solder goes under or up the side of the chip. You need a very fine tipped soldering iron for this. I couldn't really see if I had successfully soldered the chip or not, so I took a couple of pictures.

The result is not very pretty, but it must have been OK because the transmitter eventually worked!

When ordering, I specified  my call, locator and the supply voltage I would be using (12V, as I planned to power the transmitter off a pack of 10 NiMH batteries.) The PICAXE controller chip came programmed with this information and a power level of 33dBm - 2 watts.

On a freshly charged battery pack I was actually getting nearer 3 watts output once the PA tuning capacitor had been peaked up, but after the first few transmissions the power did drop off a bit to become nearer the advertised 2 watts.

I hooked the VCXO-AXE up to my attic MFJ magnetic loop, watched the radio-controlled clock in the shack until it rolled over to an even minute, pressed the transmit button and a couple of minutes later had my first WSPR spots.

Soon after that I had several more. No great DX, but perhaps that is just down to conditions at the moment.

The instructions warn that second harmonic suppression of this transmitter is not great and an external low pass filter is advised. However, the magnetic loop (either the MFJ or my portable Wonder Loop) has a very high Q which I am sure does a good job of attenuating out of band harmonics on its own.

My next move will be to build the little transmitter into a plastic box and use it as a hand held portable WSPR rig. It would be fun to try making a 30m base loaded whip - which should also be fairly high Q - and see how well that works. So expect some WSPRing from various locations around Cockermouth some time soon!

This was a fun project and a good morale booster to prove to myself that I can still build stuff - and with an SMT part in it, too! Thanks to Jay W5OLF for making the kit available. A 20m version would be nice, as well!

If you want to buy one of these kits for yourself you have to look on eBay, though as of right now there doesn't seem to be any for sale.

Bicycle mobile

I've always been a bit of an armchair traveller, and also an armchair cyclist. I like to read accounts of people's travels through foreign lands, particularly if they are travelling by bike. The slower pace and need to stop and talk to more people means that they are able to convey more of a feel for the place than you get from reading grossly overrated travel writers like Bill Bryson. So having just come across the blog of Raf, ON5RZ, who is currently cycling through the USA and Canada with an FT-817 and wire antennas, I have some reading to catch up on. Perhaps you'll enjoy reading it, too.

Whispering with wonder

A few days ago I dug out of the cupboard the Wonder Loop portable magnetic loop that I made a while ago. I had lost the pieces of uPVC electrical conduit that made a Heath Robinson support for the coaxial cable loop element. But I had always felt the saggy coaxial loop was a bit of an eyesore anyway. So I decided to make a new loop using microbore copper tubing. It turns out that you can buy this stuff on eBay - any diameter and length that you want shipped to your door next day by first class post. Three metres of 1cm dia tube cost just over £12.

The new loop looks a lot better and certainly hasn't harmed the performance of the antenna which continues to amaze me. I tested it using WSPR at a 1W power level on all bands (40m - 15m) that my Wonder Loop covers. The best result was obtained yesterday afternoon on 20m, between 16:30 and 19:38z, when I received 15 reports from VK2XN of from -9 to -25dB SNR, at a distance of 16579km. This, I repeat, was using just 1 watt from the FT-817 with the Wonder Loop sat on my shack "workbench" almost exactly as in the picture. (The FT-817 was moved to the radio/computer desk during transmission.)

I also spotted 9 reports of VK2XN during the same period, which surprised me due to the extremely high noise level I have here on 20m. The SNRs weren't so good, though, and he was running 10 watts. Still, that almost qualifies as a two-way contact.

I haven't tried other modes yet, mainly because the shack is so small and these days I'm a bit wary about sitting inches from an antenna even if it is radiating no more than a watt or two. But the original Wonder Loop was very successful using PSK31 and I hope to try this one with JT65A shortly.

The one disadvantage of the new copper loop is that it isn't exactly portable, which had been one of my original objectives when building the antenna. If you could get hold of some metal strip it might be possible to make the loop from six pieces that you can join together using bolts and wingnuts to form a hexagon. Possibly you could even do this using tubing, flattening the ends of each 60 degree segment and then drilling them so the loop could be bolted together. But as I'm not planning on taking the antenna anywhere at the moment I'll keep the one-piece loop which I can stick behind the shack door for storage.

This is a really great antenna that should enable anybody to operate HF from anywhere.

QRP and DXing

I rarely post on the Elecraft reflector these days but I do check Nabble from time to time to see what's going on and today I saw one thread that got me annoyed. Someone who had just built a new base version K2 posted that until he had done so he hadn't realized that it was possible to work DX using 15 watts. Someone then piped up that QRP DX claims are pretty meaningless unless the antennas used are also mentioned - a point with which I'd agree. But then someone had to add the hoary old argument "They also don't report how the guy they worked had to struggle to pull them out or what his equipment was."

This argument gets my goat every time. Whilst many people use QRP through choice, when it comes down to antennas many people don't have a choice. If you live in an apartment, or like me in a tiny house on a postage stamp sized plot, or if you have HOA restrictions, or again like me have an awkward neighbour who likes to make your life difficult just because he can, then having a tower and a beam, or even a decent long wire antenna high and in the clear simply isn't an option.

What these people seem to be saying is: "If you can't run high power and a beam like me then don't waste my time." Now, excluding a lot of people from the hobby just because they aren't fortunate enough to be able to put together a top class station doesn't seem to me like a good thing for the future of the hobby.

It is surprising what you can work using low power, even with modest antennas. And what the naysayers who have probably never even tried using low power and simple antennas don't realize is that it is also surprising how many contacts don't have to struggle to pull the QRP station out of the noise. In fact they have probably worked many low power stations themselves without realizing it because the other guy never mentioned he was using QRP. The attitude that "life's too short for QRP" is just bullshit.

But when making contacts with low power and limited antennas is a struggle there are always other things you can do. Personally, ticking countries off a list has always seemed to me to be an exercise in frustration, especially since the advent of the DX Cluster which means that you'll almost never come across a DX station that isn't on the end of a pileup. And whilst it's nice to have a chat uisng the radio, these days it's so much easier to have a discussion about the hobby online using forums, blogs and so on.

For many of the QRP persuasion, ham radio is a lot to do with seeing how far a little radio signal can go. And there are so many ways you can do that - with QRSS beacons, WSPR and weak signal digital QSO modes like JT65A. Today I saw a Google Groups post from Joe W6CQZ/4, the author of the JT65-HF program, who is using the mode to make contacts running 500mW to a 20m Hamstick mounted on the metal roof of his shed. This sort of thing is much more satisfying than working DX using a superstation. Let's fact it, anyone could do that if they had deep enough pockets and enough real estate. Where's the challenge in it?

So if you can't run a superstation don't be discouraged by the braggers with their QRO gear and big antennas. There's a heck of a lot of fun to be had in this hobby using low power and simple gear. And I'll bet a whole lot less frustration, expense and envy as well.