Solar CDX

Concours IF 2015: Sourire

15391458183_f602481b75_o“Sourire” s’agit d’une courte histoire racontée du point de vue d’une marionnette. Vingt-quatre commandes — 19 de spécifique et 5 juste pour passer le temps — suffissent pour atteindre la solution. Néanmoins, j’ai bloqué

quelques fois et de temps en temps j’ai eu besoin de jeter un coup d’oeil au walkthrough.

C’est un imposant défi d’écrire une IF dans laquelle le jouer est littéralement pendu des fils et presque immobilisé. Le joueur apprend immédiatement que ce n’est pas possible de se déplacer dans les directions cardinaux. D’ailleurs, il n’y a beaucoup de voir est les objets vus sont hors de portés du joueur. Qu’est-ce qu’on doit faire? C’est un bon commencement, pourvu que le joueur ne devient pas frustré après quelques tentatives de faire avancer la scène.

Intrigue: 6

Le personnage central, la poupée, a un but clair – elle veut sourire, mais son visage de bois peint ne change jamais son expression. Pour y arriver, elle doit négocie avec un rat peu fiable. Elle est si désespérée de sourire qu’elle obéit au rat, et …c’est parti. Qui est la poupée, le rat, les autres jouets, et le garçon qui se figurent dans l’histoire? Leurs descriptions sont plutôt superficiel.

Jouabilité: 6

Il y avait des situations ou une solution raisonnable a échoué à la première instance mais a réussi quelques tours plus tard. Par exemple, au commencement j’ai tenté de me balancer mais cette action est bloquée avant qu’on parle au rat. Pourtant, si une telle tentative ne réussit pas la première fois, c’est improbable que le joueur aille la répèter plus tard dans l’histoire. Le libre arbitre est limitée – une bonne chose pour une poupée, mais pas pour le joueur.

En plus, j’avais des difficultés de deviner les verbes attendues — par exemple, “tordre”. Je crois que cette verbe n’appartient pas aux verbes “canonique” d’IF. Ce n’est pas interdit de ajouter les verbes, mais je suggérerais d’accepter une gamme de synonymes.

Voix: 6

C’est difficile de etablir une voix dans une telle courte IF.

Raffinement: 8

La texte était bien rédigée. J’ai pas remarqué des erreurs.

Technique: 8

Ce qui m’impressionnait fortement était la “dactylographie automatique” — un effet où n’importe quel clef est tapée par le joueur, la texte se déroule selon la pièce de théâtre dans laquelle la poupée joue sa rôle. Le joueur a un bonne expérience d’être hors de contrôle.

Visit to Zambia

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Flooding in Madagacar after the most recent cyclone.

This year’s cyclone season has been unusually severe – folks in Madagascar are telling me that it is the worst one since around 1959, particularly from the perspective of the central highlands. However, most of the precipitation has been on the coasts, where towns are literally underwater. Storm systems tend to form over Mozambique, intensify in crossing the channel, land forcefully on the west coast of the island, cut across it, and continue into the Indian ocean, either eastwards towards Réunion or shifting towards the south. Along the way, the storms dumped enough rain to entirely saturate the soil in the first month or two. Now, there is nowhere for the water to go, and it is overflowing dikes, bursting dams, and causing mudslides. Before the rainy season, the government was struggling to keep the wobbly national infrastructure working, but at this point, it is struggling to maintain basic services such as electricity and road maintenance.

I have been here only about half the time due to business travel, but each time I’ve returned, the situation has gotten worse. However an end is in sight: the season usually resolves by the end of March, so another couple of weeks, and the skies should dry up.

Cancer delegation including staff from MD Anderson Cancer Center, the UICC, Albert Einstein Hospital of Sao Paulo, and Barretos Hospital of Brazil, the CDH, and Zambian Ministry of Health.

Cancer delegation including staff from MD Anderson Cancer Center, the UICC, Albert Einstein Hospital of Sao Paulo, and Barretos Hospital of Brazil, the US National Cancer Institute, the Lusaka CDH, and Zambian Ministry of Health.

My most recent trip took me back to Zambia to visit the Cancer Diseases Hospital in Lusaka. It is very likely that I will be back in Zambia in the future, and I would certainly like to take some time off there — perhaps a visit to the Falls next year. Consequently, I took some steps towards getting a Zambian license.

Prior to the trip, I corresponded briefly with 9J2BO, Brian, who I’ve heard frequently pounding out CW both under his own call and, in the last year, as a special event station commemorating the 50th anniversary of Zambia’s statehood. Brian helped me connect with Lloyd Matabishi at ZICTA, the Zambian Information and Communication Technologies Agency. I wrote to Lloyd just before I arrived, and his response was short but accurate: “You can walk in  and you will be attended to.”

The office is on the corner of Independence and United Nations Avenues — conveniently, between the hotel where I was staying and the hospital where i was working. I ended up there twice – once to get the application and once to drop it off; both times, the taxi driver knew exactly where to go. If they didn’t know ZICTA, though, it would be enough to say that I wanted to go to the old US embassy building.

As someone who frequents US embassies, I found the layout of the reception area of ZICTA strangely familiar. I signed in a the front desk and walked back to Mr. Matabishi’s office. Before going, I had downloaded a license application from the ZICTA website. It had an old address for the ZICTA office and the licensing fee was expressed into the former Zambian Kwacha (1000x devalued versus the current New Zambian Kwacha). He printed out a new version of the form for me and told me that the license application system is now in transition; in a couple months, they hope to have it entirely online.

IMG_20150306_143806The licensing document is used for multiple radio services, so it seems like overkill for the amateur radio service, asking questions about multiplexing methods, antenna diversity, etc. Amateurs filling out the form should be prepared to supply information about their intended rig and antenna system. Most of the rig information can be gleaned from a manufacturer specification sheet (sensitivity, spurious emissions, etc.). They ask that the applicant calculate radio power output, line loss, antenna gain, etc., and overall EIRP. While amateurs may be more at home with watts for power output, they ask that it be expressed in dBW. The form also asks about operating location, time, and frequency ranges. The form does have a checkbox for portable operation, but also asks for a fixed address, height above average terrain, etc. For that, I used the coordinates of my hotel in Lusaka, although the portable aspect of the operation may take me other places in the country. Regarding frequency ranges, I followed the IARU region 1 band plan.

In addition to the form, when I returned the next day, I submitted photocopies of my passport as a form of identification and of my US license. The form stipulates that the applicant have passed a morse code test; my present Extra class license was taken as evidence. It is true that I did pass a morse test at some point, but my present license is not really evidence of that as morse is no longer a requirement in the US. In any event, it never came up in conversation.

Mr. Matabishi did think it was strange that the FCC license was so small – I showed him the wallet version that I had with me. I also indicated that the FCC would no longer be routinely issuing paper licenses. If paper licenses remain an option, I’d suggest that future hams interested in operating overseas still obtain one, as it will make this process easier.

When I submitted the license, I also paid the processing fee of about 61.55K, a bit less than ten US dollars. I was told that the license could be renewed subsequently subject to a similar yearly fee that would not require resubmission of the paperwork (assuming no changes in the operating conditions), but could be handled remotely by bank transfer.

When I submitted the package, I had to provide a Zambian postal address, and this may be a limiting factor for those from abroad who are interested in obtaining a Zambian license. Luckily, I have several friends working in Lusaka and was able to ask that they forward any mail to me. I was told that if there were any questions/clarification, though, I could be contacted via the email address that I had provided on the form. Perhaps when ZICTA moves to a web-based application process the postal address requirement will go away.

So, I left Zambia without a license in hand, but am hopeful that the process is in motion — we’ll see.

2015 ARRL CW DX

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If North America were a toroid, one could pass the windings through the Dakotas.

Having recently put up the G5RV, I gave the ARRL DX CW contest a shot this past weekend. The antenna is up only about 10m and is not resonant on 15m, but it has performed well on 10 and 20m in the past. On the first night, 10m was very quiet, but activity on 20m was brisk, particularly in the early morning hours when I was working two calls per minute.

In principle, 10m should have been open starting the in mid-afternoon on Sunday, but it was slow until around dinner time. Again, 20m was my main band, despite having mostly mined it out the previous day. I managed to get a few contacts on 15m, and even fewer on 40m, where local noise was a problem.

I didn’t stay in the chair the full time, even when I had favorable North American windows. I had to disconnect the antenna for some time due to thunderstorms on Saturday afternoon and on Sunday evening I had a guest in town and went out for dinner. Still, I am happy with the number of contacts I made given my conditions.

I worked a few states that I hadn’t such as Vermont, Rhode Island, Delaware, West Virginia, Nevada and Wyoming — hopefully, those stations will QSL via LOTW. I heard a North Dakota station, but barely, and he was drowning in a pile up. Maybe I’ll take another shot when Sweepstakes or some other convenient contest rolls around and I have the hexbeam up.

My final tally:

Band QSOs Mults
40m 7 4
20m 418 52
15m 18 13
10m 56 26

3A/AI4SV Reverse Dxpedition

Sunset in Nice.

Sunset in Nice.

Living in Madagascar, I have enjoyed operating from a sought after DXCC entity; little did I suspect the same would be true on my recent trip to Europe. I packed along the FT817 on a trip to Nice, France, where I attended a business meeting. I had picked a hotel with an open 8th floor deck and hoped to string up the end-fed to operate in the evening. On the way out the door, my wife asked me, “so I don’t suppose you’ll have any time to visit Monaco, while you’re there?”  I have to admit that I hadn’t really thought about it, but as soon as she mentioned it, the gears began turning. I had meetings in Nice and Lyon, but some free time on Saturday before flying out. On the way to the airport, I double checked that Monaco was a signatory to the CEPT convention.

Continue reading 3A/AI4SV Reverse Dxpedition

How my antenna switch became a loudspeaker

ad4I envision having a few antennas: the hexbeam, the G5RV, lindenblads for 70cm and 2 satellite work, perhaps a vertical of some sort if I can figure out where to place it, and maybe some kind of beam antenna for six meters. To make all that work, I’ll need some sort of way to bring the lines in the shack and to switch among them. I brought four alpha-delta four position switches, which should be enough to both perform this function and switch the lines to the available rigs. With that intention, I laid the switches on the bench and drew out the wiring diagram.

However, I never got there; not yet, at least. After piling up some connectors and coax and wood, I realized that what I really needed in the garage in order to do this sort of work was some kind of background noise to keep me entertained. So, I pushed the very useful antenna switching project to the side and turned back to the computer that I had fried a few weeks ago by plugging it into the 230V while its power supply was set to 110V.

Continue reading How my antenna switch became a loudspeaker

The G5RV is up

G5RVF4The antenna situation has improved. There is progress on the hex beam, but in the meantime I’ve put up a G5RV. It is almost exactly the size of the largest run possible on my property. I had some difficulty getting enough angle on the trees to shoot the line and I am frankly surprised it all worked. The line is tied down to the tree trunk on one end, and the other loops over a tree, then through a metal loop screwed into the property wall, and that end suspends a brick, which maintains tension on the line but has enough give to allow tree motion. The center twin lead is centered over my house and I was not able to get the two arms of the antenna high enough to allow the feed line to hang down straight; this is not ideal as it will change the plane of radiation since the feed line is active in this design. I was also concerned about the feed line coming down too close to the metal roof, so I have arranged another support for the feed line, which pulls it close to horizontal. It also keeps it away from the high power security lights that rim the roof and which put out some RF.

I swept the antenna with an MFJ analyzer in the shack and the SWR is less than 3:1 on 80, 40, 20, 17 and 10m. I have had some good runs on 10, 17, and 20 meters, and a few contacts on 40m. Even on bands where it it not resonant, I’ve had reasonable success using a tuner; being able to run 100W gives me some margin for inefficiency. I worked one EU station after another one afternoon on 30m, and finally had a contact with Alain, 5R8AL, also in Madagascar on 12m. The additional power has allowed me to run a frequency on voice.  I’ve now set up the TS450 for digital communications and have had a few PSK31 contacts as well. I’ve getting some RF back, which is affecting the external USB sound card, so a near term project will be fixing station grounding.

wood mill workers milling the tree into a postAs for the hex beam, I finally have all materials. I visited a local lumber yard and had a 4m x 15cm x 15cm post milled. It arrived at my house on a cart and is now sitting across two chairs on my porch. I’ve given the post a coat of wood treatment (permethrin + cobalt salts) and will paint it for more protection. Meanwhile, an almost 2m deep hole has been dug in the backyard, and I’ve purchased about 200 kg of cement, which with some aggregate will become the base for the wooden support beam.

The plan is to get the base in place and set up a shelf using angle iron to support the G450 rotor. Further up the post, I will install a universal thrust bearing to handle the lateral load. A 10m spiderbeam telescoping mast will support the hex beam, and will itself be guyed at two levels. Finishing this project will await some good weather and enough time to see it through.

Concours IF 2015: Comédie

730px-New_Theatre_-_stage_-_The_Architect_1909Voici ma première critique d’une IF française en français (ou, j’espère en une langue qui se ressemble un peu au français)…

Comédie par “Edgar Havre” est composée des scènes liées par les courtes conversations. Grace au module “Simple Chat” par Mark Tilford, les conversations se déroule comme une série de choix. Pour commencer une conversation il faut “parler à qqn”. Les conversations se modifie un peu en fonction des événements observés. En cette manière, les conversations sont limitées, mais elles servent pour introduire les puzzles.

J’emploie encore les meme critères qu’auparavant, sur une échelle de 1 à 10 dans chaque catégorie:

Intrigue: 7

C’était un bon histoire. Au commencement du jeu ce n’est pas évident pourquoi le PC veut entrer dans un théâtre se faire passer pour l’assistant metteur-en-scène. En parlant avec les ouvriers, le joueur a l’opportunité d’explorer ses propres motivations et celles des autres personnages. Le seul négatif: l’histoire se termine trop rapidement et enfin on apprend que tous les efforts du joueur ont été réduits à zéro. Après avoir terminé le jeu, je crois que les joueurs trouveront cette conclusion un peu decevante.

Jouabilité: 8

C’était un plaisir de jouer, mais il y a quelques instances ou le joueur a besoin de choses qui ne sont pas décrits dans le texte. Par exemple, dans le première scène, j’ai trouvé le badge par hasard:

>parler

(-> le badge)

Vous ne pouvez pas parler au badge !

Oh? Un badge se trouve ici? D’accord, je le prends.

Dans une autre scène, il faut récupérer un objet dissimulé dans une pièce sombre. Comme d’habitude, j’ai cherché un feu pour illuminer la pièce mais la solution exige que le joueur prenne un objet invisible de la pièce. Une conversation donne une astuce, mais c’est au joueur de deviner le mot attendu.

J’ai trouvé le dernier puzzle difficile. Le mécanisme du puzzle marchait bien, mais j’ai eu du mal à “penser autrement”.

Voix: 7

Tous les personnages ont des personnalités bien caractérisés.

Raffinement: 7

En tant qu’un anglophone jouant au jeu francophone (merci, wordreference.com), le jeu m’est semblé bien écrit. J’ai remarqués quelques petites fautes de frappe qui peut être corriger après le concours.

Technique: 7

Pas de problèmes de programmation. Le système de conversation était performant et bien utilisé.

<Avertissement: les spoilers apparaissent après la ligne>

Continue reading Concours IF 2015: Comédie

Fried Power Supply

The original fuse (white tube) after cutting away black heats hrink tubing.

The original fuse (white tube, bottom left) after cutting away black heatshrink tubing.

As a public service message, I feel obliged to share the following nugget of wisdom: before plugging a tower computer into a 220V outlet, reach around to the back of the computer and make sure the input voltage select is 220. Sounds simple, right? This isn’t something you have to think about for most laptops, which have dual voltage power supplies. They are happy plugged into either voltage and the power supply brick just works.

I’m not [arguably, perhaps] an idiot – I was aware of the switch. I just thought that the power outlet was off, but also I didn’t expect to encounter an issue until the computer itself was turned on. Wrong — ATX switching power supplies are always on. When I plugged the computer in 220V, there was a popping sound followed by smoke from the back of the unit. Never a good sign.

I pulled the power supply out, opened it up, and looked around. Nothing was obviously charred. My nose has lousy spatial resolution — it confirmed that something wasn’t right, but couldn’t help me localize the problem. I followed the wiring from the outlet inward. For a cheap supply, I was glad to see some decent capacitors on both live and return wires to ground, and across them. Also, some inductors to quell EMI. Next in line: the fuse. It had blended in because as a safety precaution, it was wrapped in heat-shrink. I cut away the heat shrink to reveal a white tube. I couldn’t see into the fuse, but my continuity tester showed it had blown. There was no fuse holder; the fuse was just soldered in by its leads, so I dutifully unsoldered it.

I looked through the rest of the supply, and it looked fine. The next component in line was an NTC thermistor, and it seemed okay, then the primary transformer, and onward towards the voltage doubler circuits (since the switch was in the 110V configuration at the time it blew). It seemed to good to be true, but I thought I might get away with just replacing the fuse. Having ransacked some other switching power supplies in the past, I did have a 250V 6.3A fuse on hand (which is good, because it would have taken at least a month to order one).

Scorch marks at the location of the former MOV, to the left of the  bridge rectifier, also removed.

Scorch marks at the location of the former MOV, to the left of the bridge rectifier, also removed.

After encasing the fuse in heat-shrink tubing, I stuck the new fuse in, closed up the power supply, wired it back into the computer, and made sure the switch was on the 220 setting this time. I put on my safety goggles and plugged it in. Puff! Another impressive pop and some smoke.

Again, I yanked the supply. Obviously, the problem ran deeper than the fuse. I couldn’t see any failed components, but between various wires and component density, plus copious amounts of sticky glue used to pot the components, it was difficult to get a good look at the whole board. I like to find and fix problems, but I’m also not crazy. I ordered a replacement power supply from New Egg and got to work on a postmortem. At the very least, I figured that I could harvest the inductors and toroids.

When I dug down, I did find some scorch marks near MOVs that had given their lives for the cause. These charred little guys failed short, so no wonder the fuse kept blowing. They were also cloaked in heat-shrink tubing, which made the failure harder to spot.

As I dug through the board, I wondered if the bridge rectifier had also been damaged. So far as I can tell, no — it tested fine. In principle, I think I could have replaced the failed MOVs  and fuse and had a working supply. However, given the layout of the board, I’m not sure I could have gotten easily to the MOVs. Oh well, at least some more parts for the parts bin. I’ll shelf the computer until the new supply comes and see where we go from there.

Two bad fuses, two bad MOVs, and one good rectifier.

Two bad fuses, two bad MOVs, and one good rectifier.

First Big Storm

Friday afternoon, a “moderate tropical cyclone” swept west-to-east across the Island. It was a big enough storm to get a name, Chezda, and I’d been watching it on satellite pictures for a couple days. In the last afternoon, it hit the west coast, bringing rain and wind. This is what it looked like. It’s the swirly cotton thing on the left. The more ominous looking storm on the right is another one, Bansi, that wasn’t a problem for Madagascar, but did affect Ile Rodriques. It is headed southeast, so not so much of a concern.

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Since the picture was taken, the center of Chezda has moved off the east coast of Madagascar, but not before dumping a lot of water yesterday and blowing fiercely overnight. Many low-lying areas were flooded. We’re a couple weeks into the rice harvesting season, and in this area, it looked like only about half the rice had been harvested, so I would guess some crops might have been lost to inundation.

There were a lot of power fluctuations yesterday, but as far as I can tell, no major damage in the local area. The wind died down the the sun came out around ten this morning. I’m pleased to report that aside from a bit of water around the garage door, no water entered the garage. The improvements to drainage happened just in time.

The storm is predicted to continue to move south-east and should miss the populated islands in our region.

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More Garage

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Water in the garage. This is a problem.

In the previous post, I mentioned that our shipment from the US came in several large wood crates, just as the rainy season started. I had a lot of boxes of radio gear, tools, and other items that needed sorting and I wanted to work in the garage, but since the garage is built below ground at the end of a down-sloping driveway, I was worried that the garage floor could not be trusted to remain dry. As the rainy season picked up, I soon found that this concern was justified, as the french drain in front of the garage could not cope with the run-off.

I had a few of the bottom pallets from the shipping crate; each sits about 8 cm above the floor on wood blocks. I moved these to the back of the garage (since the floor slopes towards the front where the drain is) and piled everything on top of them, while I considered my options.

Although it is rainy season, most of the time it is not actually raining. Most of the water in the front of the garage would run out almost immediately, and the floor would often be dry a half hour later. Unfortunately, the receding water would always leave behind a fine red mud, or after drying, dust.

Making some sort of raised flooring seemed like a good idea. Unfortunately, the plywood used in shipping crates is of very poor quality and only about a cm thick. I could walk on it, but it would groan and sag. However, I had a lot of it.

Fine, government-quality plywood.

Fine, government-quality plywood.

I spent the next couple weeks disassembling all of the crates, pulling out the useful two-by lumber. I must have pulled out thousands of nails — most of which I was able to straighten and use again. I remember the day I packed out in Virginia: it was also raining. The moving guys covered the crates in copious amounts of plastic wrap. The corollary is that both the framing lumber and the plywood were chock full of staples. I painstakingly yanked them all because I was paranoid that I might hit them with an electric saw later in this process.

I piled up the lumber, trimmed off bits that were too damaged to be useful, and played a constant game of shifting around unpacked boxes, lumber and tools, to get at the materials I needed while still keeping everything high and dry.

Since the plywood was so thin, I added some reinforcing cross members to the lumber framing and then tossed another layer of plywood on top, laminating it to the existing plywood with some locally purchased wood glue. Between the wood glue and additional nails, the double-thickness plywood made a solid floor. Still a little creaky, but no real give.

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Two of the pallets support a table on the left and a pile of bricks on the right. Note the red stain on the floor, where water had accumulated transiently.

The water never got more than a centimeter or so high in the garage, but I didn’t like the idea of wood blocks sitting in water. This set up has to last four years or so.  I needed some kind of solid, water-resistant material to serve as supports for the wooden feet below the platforms. Not surprisingly, I obtained locally produced bricks. Bricks are very common here — they are produced from rice paddy mud between crops. They are not the best quality bricks as they lack binding materials and fiber; they are just baked mud. They are relatively fragile to shocks, but resilient to compressive force. For my application, they worked fine, and the price is right: 80 ariary each (about three cents a piece).

So, in boosted the existing flooring up, with two bricks under each supporting wood block, and then fabricated some additional flooring so I had covered the rectangular middle portion of the garage. The back of the garage is strangely trapezoidal, so I put that off for a bit.

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A view from the back of the garage looking towards the door (which is down).

I needed a place to work and also some storage, so I made some work benches. I more or less followed a design from a YouTube video for a bench that looked very solid. I already had an Ikea table, which works best at a sitting height, so I made the benches to be used while standing. Like the floors, the benches are made out of wood recovered from the packing crates (although I did top one with some nicer, sanded plywood that I had shipped for that purpose).

Going back to the source of the problem, drainage, I had some workers clean out the drain area at the left end of the grill, above. I hadn’t realized how much silt had collected. They reamed out the pipe downstream as well. I watched the drain during the next heavy storm and was pleased that it had no problem diverting the water as fast as it came.

With less worry about moisture, I decided to install a short carpet in the central area of the garage. The addition of the carpet made it feel much more comfortable. Next came the rolling office chair.

Finally - some storage. All those tiny parts!

Finally – some storage. All those tiny parts!

Finally, I set up the Ikea shelfing and was able to unpack the many boxes of hoarded electronic bits and pieces. I still have some unpacking to do, but I am now able to get to everything: patch cords, adapters, tools, etc., which will let me get going on station and antenna set up.

The first project for the new workspace: construction of an antenna panel to bring coax into the shack through lightning arrestors and antenna switches. Other projects on a near infinite list include finishing the back portion of the garage and installing some storage shelves for larger items, working on the mount for the hex beam antenna, and fabricating some additional antennas.