Google Mars and Google Moon

Having played a bit more with Google Earth, I see that you can also view Mars and the Moon too. Quite fun to fly over the Martian and lunar landscapes.

When looking around the Moon tonight I noticed some quite strange markings in one area. Does anyone know what these are?

Again, I have attached a screenshot (Google copyright acknowledged - will remove if told to do so, but Google you are getting yet more FREE publicity for this tool).

http://www.google.co.uk/intl/en_uk/earth/index.html

Path profiles using Google Earth

My thanks go to Richard G3TFX for showing me this Google Earth feature, which may be of interest to VHF/UHF/SHF, microwave, nanowave and SOTA enthusiasts. I had no idea you could do this.

Using the ruler tool (in the menu at the top) in Google Earth click between two places. A line appears together with a distance measurement. Save this as a temporary file in Google Earth. Right click on this file in Google Earth and choose "show elevation profile" and a path profile between the 2 spots appears.

Google Earth path profile

The image above (screenshot from Google Earth - Google copyright acknowledged - will remove if a problem, but you are getting free publicity!) shows the non line-of-sight path between Burwell and the village of Stow-cum-Quy that I managed to span recently with my 481THz QRSS3 beacon using 100mm optics and a TX power of around 0.5W.

This does not appear to take any account of the Earth's curvature, so is probably only useful for relatively short distances. Does anyone know how to factor in this?

Looks a useful facility to me for seeing how close to line-of-sight a moderate length path is.

73s
Roger G3XBM

WiFi extenders?

At the new QTH, the ham shack will be some way from the wireless router and I will not be able to see if the signal will be usable in the shack for some weeks yet; I have yet to organise the move with the internet service provider. (Reminder to self: contact supplier)  Although I could run a network cable through, I'll not do this yet in case the signal proves to be good enough.  It means drilling yet more holes in walls and scrabbling around up in the furthermost reaches of the loft, not something I want to do at my age.

Does anyone have any recommendations for WiFi extenders? Maplin and others advertise these but I am concerned about pumping data along mains cables and the resulting QRN likely to be produced, especially in the lower HF spectrum. Does anyone know of one that is electrical quiet, if that is even possible?

In distance terms, the shack is about 20m from where the router is likely to be located, but the microwave signal will have to get through 3 doors (one is metal) and 3 walls. In the current home the router is upstairs and is a decent signal in the lounge downstairs, but through one more door the signal is non-existent. Incidentally I use a recent Netgear super hub supplied by Virgin Media.

WSPR on an Android or iOS tablet?

A version of WSPR that would run on my iPod Touch 4g or even a version that would run on an Android platform would be a very desirable app. Although there is at least one app for WSPR, this is just a way of looking at the on-line database and not a version of the actual WSPR beaconing software.

I asked this before (back in March), but does anyone know if such a WSPR beaconing app is likely soon, if ever?  Not being a software guru, I've no idea how difficult this would be, but can see a lot of demand for such an app.

Continuing radiated tests on VLF from Holland

Henny PA3CPM continues to fire up his VLF system on  8.270kHz from time to time. Henny has a very small antenna, just a top loaded 14m long sloper but he manages to get 0.6A antenna current and his signal is now regularly copied several hundred kilometres away by people with suitable antennas, preamps and software. Unlike my own VLF earth-mode transmissions, Henny's signals propagate by radiation. He is a shining example of what can be done with a modest set-up on the so-called "Dreamer's Band".  It is no mean feat to radiate a decent signal on VLF with such a small antenna. I have asked Henny for photos of his VLF TX, antenna and loading coil.

Ultimate 2 QRSS beacon TX

The Ultimate2 QRSS kit

The latest edition of SPRAT, mine arrived yesterday, reminded me that G0XAR and G0UPL have produced a very nice QRP beacon transmitter for weak signal modes including QRSS and WSPR. This unit can run stand-alone without tying up a PC to generate the WSPR message, although a GPS module is needed to get the WSPR time sync. The beacon will work on all HF bands with a suitable low pass filter and do other modes like QRSS too. There is even a version that can do WSPR and QRSS in alternative time slots.

See http://www.hanssummers.com/ultimate2.html . At just £17.50 this is a great value kit for those interested in weak signal beaconing.

Earth-mode transmitter on my website

I have added a page on my main website showing the VLF earth-mode beacon transmitter currently being used. In the next few days I'll add the article that appeared in RadCom in 2011 which shows the schematic as well as some more details of the recent tests.

At the moment, my earth-mode tests are on hold. I am finding more and more of my time is being taken up preparing for our house move. At some point in the next few weeks it will be time to take down the V2000 VHF/UHF vertical and the other antennas. It is a long time since I've had no antennas up at all! With luck I'll soon have them back in place at the new QTH and I can start DXCC chasing (gently!) from scratch again. I wonder how long it will take to work my first 100 DXCC countries with modest antennas at the new QTH?

The new home has a totally different shape garden and I shall be intrigued to find out how well (or not) an earth-electrode antenna works on VLF, LF and MF. A 20m baseline spacing between electrodes should be possible by placing the remote electrode at the far corner of the garden with the feed wire diagonally across the garden.

What happened to my PC memory?

My 7 year old Dell laptop with 30GB hard drive decided to tell me that I had no memory left today. I did the usual tricks: ran CCleaner, emptied the recycle bin got rid of lots of temporary files etc but still seemed to have freed up only a little. Then I searched the C drive for large files not in My Documents and sub-folders. To my amazement I found WSPRX and other similar programs had been storing WAV files of every time I'd used the software! In total over 5GB of disk space.  Having cleared these - no doubt there is an option to stop saving these - and moving little used files off the PC, I now have over 14GB of space. After a defrag and a full virus scan it is ticking along nicely. MS Essentials does a good job of keeping the rubbish out and CCleaner is excellent for house keeping.

SAQ (17.2kHz VLF) transmission June 30th 2013

It is always fun to listen on 17.2kHz for the special test transmissions from the historic Grimeton alternator transmitter in Sweden.  Lars Kalland writes:

"We will remind you of the Grimeton Radio/SAQ transmissions on 17.2 kHz, CW, with the Alexanderson alternator on Sunday, June 30, 2013, “Alexanderson Day", at 09:00 UTC and 11:00 UTC.  We will start tuning up some 30 minutes before message. "

They welcome reception reports for these SAQ transmissions either via info@alexander.n.se , via the Swedish QSL bureau or direct to:

     Alexander-Grimeton Veteranradios Vaenner,
     Radiostationen
     Grimeton 72
     SE-432 98 GRIMETON,
     SWEDEN

(NB: new address)

The QSL card from SAQ is something quite special. I was lucky enough to receive one a few years ago.  Also see their website at www.alexander.n.se .

A suitable downloadable software receiver (needs a wire connected to the audio input of a PC sound card - add back-to-back diodes to prevent damage) is available at https://sites.google.com/site/sm6lkm/saqrx/. 

Eagle comic and a mystery book

Back in the 1950s, my brother used to get the Eagle comic every week and I got Robin, then Swift. These were quality comics which, as well as the strip cartoons,  had lots of useful factual information and cut-away drawings showing how things were made and worked. The centre-fold was always a complicated cut-away drawing of something interesting for a future engineer!  A few Christmases  back I got a book called, "Eagle Annual, the best of the 1950s comic" which contained a lot of these stories and cut-aways.

One of the regular articles in Eagle was a strip-cartoon called "Professor Brittain Explains" in which a professor shows 2 youngsters how things work like a coal mine, parliament, weather forecasting etc.

Does anyone remember a hardback book along the same lines as the "Professor Brittain Explains" format that was available in the mid/late 1950s in the UK? 

Unless my memory is playing tricks, I had this book as a child and enjoyed looking at it for hours and hours yet I cannot remember the title or the publisher, so searching for it on the internet has proved impossible.

If anyone can remember the title of this book, the date it was published or the name of its publisher I would be immensely grateful and I'd pay generously for a copy.  I have been searching for it now for close on 40 years without success. My hope is that someone out there still has a copy and this jogs their memory. I've asked before and not been successful. The book is entirely in strip cartoon format with the professor explaining to the children about a particular topic on each page. It must have around 100-150 pages.

Trigger any memories? Hidden in the bookcase?