AmateurRadio.com

From my bank statement I see my 40m Pixie kit from China, that has shipped, cost a little over £7. This includes all parts including crystal and PCB. At this price it would be hard to buy the individual parts. I very much want to build this as it will be the first amateur radio construction here in a very long time.   It is sufficiently simple and low cost that I should manage it, even if I am a little clumsy still with the soldering iron.

 No doubt Andrew G6ALB (3km) will help with a first test.

Roger Lapthorn, G3XBM, is a regular contributor to AmateurRadio.com and writes from Cambridge, England.

Again, from Steve G1KQH, a link that may well be of interest to UK readers:

Did I send you this one Roger?

http://www.gridwatch.templar.co.uk/

73 Steve
http://www.g1kqh.talktalk.net/

Many times we hear that closing old and polluting power stations is putting us at risk of power blackouts. Check the electricity capacity yourself.

In the left hand corner you can also check for France.

Roger Lapthorn, G3XBM, is a regular contributor to AmateurRadio.com and writes from Cambridge, England.

My “first” KX3 during its early days at KG9DW.

I heard back from Elecraft yesterday, and my KX3 is officially toast. You see, it wasn’t ever designed to have 120VAC applied to the external power connector. As I feared, the current transitioned through the control board, wiped out some components, traveled across the leads to the RF board, took out multiple components, and then exited through the well grounded antenna connection.

Talking through the options, fixing it is cost prohibitive. The guys at Elecraft are working on an option for me, so I’m hopeful I’ll have a working KX3 back in the shack in the next couple of weeks. In the meantime, I’ve got a loaner radio from a buddy in the shack. It transmits fine but its receiver is so, so deaf compared to the KX3. It’s like going from an iPad Air to a Palm Pilot.

In the comments of my last post about this mistake, the suggestion of fusing along with a diode was brought up. I’ll definitely be putting more thought into my power supply cables after this costly error.

Michael Brown, KG9DW, is a regular contributor to AmateurRadio.com and writes from Illinois, USA. Contact him at [email protected].

To a novice it could sound worse. But to a seasoned operator I’ll bet is sounds like the equivalent of a rusty nail being used to score poorly formed tones in your ear hole. I’m referring to my CW style.

When I say amateurish I mean it in a couple of ways, firstly I am a radio amateur. This means I’m not getting paid for it (which, as my wife points out, is good as I would be bankrupt quickly). I’m also not a high performing (but talented amateur) mixing it with the pro’s. This means I’m somewhere down the peloton. Holding the latern rouge.

To carry on my cycling analogy. Mostly because I ride a bike as well. My gear isn’t a pinarello dogma, its not the latest shimano Di2. But its adequate, its circa 2007 and it works. My fitness is average but I can, when pushed, climb some steep hills.

The steepest hill I could find it morse code. So far I have spent nearly every lunch time since Christmas using LCWO to attempt to copy at 15wpm. This week marks the end of the letters. I can pretty much copy them all without too much trouble providing there is enough thinking gap.

I thought I’d have a go at sending tonight (Thanks Ian MW0IAN for the ear). CQ sounded like CQ in my head, but came out like QQ, T, K and a few other characters that I hadn’t intended to send but I’m hoping an operator on the other end will see through this. Just like when I hear bad practice or mistakes with SSB I hear operators ignoring their mistakes I’m hoping the same will happen with CW.

So forgive me. I have created some shocking characters. But stay with me because one day this year I will complete a QSO without making any mistakes. That much I promise! If you want to join me in rubbish CW then I can recommend it as a way to diet. I’ve enjoyed the learning so much I forgot to go for something to eat a couple of times. If you hear me calling CQ and respond only to get a seemigly random response, don’t worry its not you, its not me, its my novice brain not getting it right all the time.

 

Alex Hill, G7KSE, is a regular contributor to AmateurRadio.com and writes from Cumbria, UK. Contact him at [email protected].

See https://www.gov.uk/government/consultations/radio-equipment-directive-proposal .

Quite soon this new directive will apply in Europe including the UK. Many low cost modules may cost a little more as receivers will need to be more carefully designed to meet RED requirements. It is likely that more stringent RX parameters will have to be met. I wonder if some of the very low module costs are as a result of the dumping of old stock? This could well impact super-regen receivers that are sensitive, but not very selective. Although fine in some markets this type of receiver is less than ideal in a very busy ISM band where they could easily be blocked.  Listening around 433.92MHz recently, very many ISM devices could be copied.  One of my old colleagues is involved in international committees working on RED.

The “internet of things” means very many devices will include radios in future, such as a basic internet terminal in washing machines or RFID tags.

Roger Lapthorn, G3XBM, is a regular contributor to AmateurRadio.com and writes from Cambridge, England.

Regular readers will likely recall  my early January blog describing the sudden and very unwelcome appearance of a severe noise problem badly affecting my LF reception. I had spent an afternoon D/F'ing the noise source (which was being radiated via the local power lines), only to discover that the residence in question was not occupied ... and has been vacant for the past seven weeks as the noise continued.

The culprit

Yesterday I noticed that the home was once again occupied and this morning, with radio in hand, I paid visit. It seems that the part-time residents had been spending the past several weeks in Hawaii and had just returned to the house to check up on things. I explained to the owner what I believed to be the problem and, as suspected, it was a CFL light ... a particularly noisy one. Turning the light on and off quickly verified the culprit light and swapping the bulb out for a different one produced no observable noise, as was the case for one that had been left switched-on in the living room.

Whether the offending bulb was just a poorly designed one, a very early manufactured model or one that was about to fail, I do not know ... but I am amazed at the strength of the QRN (and QRM) that the bulb was able to produce at such a distance, about ten properties away!

CFL Crud on LF

The owner was very concerned that he had unknowingly caused a problem and was very apologetic, as I have found with similar situations in the past.

One of the worst was also a CFL bulb that had actually burned-out and was located in a nearby (three properties away) crawl space. When finally traced, the bulb was heavily charred and had partially melted at the base, yet was still producing an ear-shattering level of crud right into the HF spectrum.

In cases like these, it is often difficult to get an accurate D/F on the signal through normal means since the signal is being propagated via the overhead powerlines. Attempts to D/F the signal almost always point to the closest powerline and not to the signal source. Usually such a noise generator will be confined to your local power grid ... that is, the homes that are powered between the two large power distribution transformers in your local neighborhood. In my case, this limits the search to about 15 homes.

I have found that the best way to tackle this is to make a 'noise map' and to try and measure the noise intensity at a similar point for each property - ie. directly beneath the powerline as it enters the property. This will usually put you at the same vertical distance from the line and will give you a better noise sample that is directly (or not) associated with that property. After mapping this out, if the culprit property is not obvious, then you will at least have narrowed it down to a very few choices. Other types of noise, that can be detected into the VHF range, are probably best detected using normal D/F methods.

After bringing the offending bulb home, I Google-searched the product name and number and came up with a 'product recall' for this particular model.

"According to a Health Canada and Electrical Safety report, the lamp may overheat and melt the enclosure exposing live parts, posing a risk of fire and/or electric shock."

Apparently they were indeed manufactured incorrectly and it's just as well that it was found and removed before causing serious damage!

Once again  LF sounds as it should. Hopefully it can remain this way for a long time but with the proliferation on noise-making appliances and 'improvements', I have my doubts.
Steve McDonald, VE7SL, is a regular contributor to AmateurRadio.com and writes from British Columbia, Canada. Contact him at [email protected].

A search on eBay has thrown up lots of useful RF transceiver modules, not as low cost as the AM ones found by G6ALB, but nonetheless very low cost and suitable for local communications, Some are 100mW and some 500mW or 1W.  The ones I saw were data units, but these should be suitable for speech  with simple mods. I am unclear how some of these are programmed to the correct frequency. There is usually a choice of either VHF or UHF and I think some are essentially FM.

Put  “UHF transceiver module eBay” into Google to see what comes up. Or try “VHF” instead of UHF. I was amazed how low cost these were.

Roger Lapthorn, G3XBM, is a regular contributor to AmateurRadio.com and writes from Cambridge, England.