Low cost netbooks and ReadyBoost

http://content.hwigroup.net/images/products/xl/132431/asus_eee_pc_x101ch_black.jpg

At the moment www.amazon.uk has a very good deal (£173) on the little 10 inch Asus X101CH netbook.  Reviews are mixed, but overall this may fit the bill for a small second PC that can be used to run simple (Windows software) tasks without much multi-tasking.  It should also be able to run WSPR or Spectran as long as nothing much else is required at the same time. There is a lot of bloatware supplied which probably slows it down for most novice users. With ReadyBoost installed on an SD card I think the 1GB of RAM should be less of an issue.

My question is have readers of this blog any experience of using ReadyBoost to speed up sluggish netbooks? Also, have any readers actually got an Asus X101CH and, if so, any views on its suitability for (single task) use with WSPR, Spectran or similar?

8.5km "over the horizon" on 481THz tonight

This evening I ventured further afield with the optical kit to see if I could copy my QRSS3 beacon signal in the village of Stow-cum-Quy which is 8.5km from home . This is non line-of-sight and nearly twice as far as my previous tests last week.

Path covered this evening NLOS

Success! After quite careful searching both horizontally and vertically, the signal was copied and recorded at around 14dB S/N (at best) pointing just above the horizon. After searching for a stronger signal, the sky became increasingly "murky" and I was unable to find the signal again, so I came back home.

1W LED TX in 100mm optics, SFH213 detector in 100mm optics

This range is about the practical limit: aiming is very difficult and I find it is hard to get back to the same direction/elevation if I move anything. I need a tripod that is far more stable with some sort of degrees marking (both horizontally and vertically) so that I can go back to the best settings with confidence. At the moment it is a bit "suck it and see" to find the best aim and nearly impossible to get back to those settings easily if the tripod gets knocked.

This was clear air scattering as there was hardly a cloud in the sky. I have still to try cloud-bounce with real low level clouds.

To see the signal play this recording through Spectran with it set to 572Hz in 0.34Hz bandwidth. QRSS3 signal will be clearly visible.

There is a chance that I may try a much longer 27km NLOS path before too long. Looking at the map, this should be a possibility but I may need another 6-10dB from a Phlatlight LED and a MUCH more stable tripod!

My books on eBay

This week I have 8 items for sale on eBay including a few radio books. I am trying to de-clutter ahead of our house move in a few months time. It is proving harder than I thought to get rid of things and in fact I am still collecting more things than I am disposing of!

The radio books are QRP Basics by George Dobbs. This is an essential guide to low powered radio operating. As I have the newer edition, this first edition version is for sale. Highly recommended book.

The next is LF Today by Mike Dennison G3XDV which is the first version of the guide to LF operating especially on 136kHz, although invaluable for 472kHz too. I used this version extensively when first setting up to TX on 136kHz.

The next is The Comprehensive Radio Valve Guide which is a Babani series book listing every radio valve since 1956. As a semiconductor man I hardly ever looked at it.

Another book is the 6 Metre Handbook, a guide to the magic band by Don Field G3XTT. This book is really aimed at 6m DXers and I was a bit disappointed that it didn't say more about using the band for simple local communications.

There are also a few other good books listed and a mock marble fire surround which my local builder tells me should sell for over £100.

You can find all 8 items for sale via http://myworld.ebay.co.uk/rlapthorn .

Get bidding if you are interested as they are sure to sell.

100 subscribers - thank you

Just noticed that the number of people who subscribe to this blog has now reached 100 for the first time.  Many people just drop in from other links, but it is good to see that so many people actually subscribe.  I try to post things that interest me, and I hope interest you too, here.  Please let me know if the blog can be improved in any way.

Things (such as designs) that are of longer term use are added to my main website www.g3xbm.co.uk so check there too if you've not visited it.

Android and iPod WSPR

WSPR on the iPod Touch 4g

To the best of my knowledge no-one has (yet) produced apps for these devices that allow them to be used as WSPR mode terminals.  Not being a software expert (at all) I am rather surprised at this: these are now very common platforms that a wide variety of people have. The number is growing daily. How much more convenient it would be to use my little iPod Touch 4g, for example, with a simple QRP WSPR transceiver, than with a PC or laptop. Are there any technical reasons why such apps haven't appeared?

If anyone knows if this has/is being done please let me know. I am aware of WSPR watch but this is NOT a WSPR terminal, just a neat reporting app.  The picture shows what WSPR might look like on such a device - I wish!

I wrote to Joe Taylor to find out if the creator of WSPR knew of any attempts. This was his reply:

"Hi Roger,

No such effort has been attempted, to my knowledge.

   -- Joe, K1JT"

A solar peak in late 2013 and another in 2015?

Some experts at NASA are predicting some strange behaviour in the next few years with the possibility of a twin peak for cycle 24 but with one peak being this year and the other on 2015. A similar twin peak occurred in cycle 14 in the early 1900s.  See http://www.arrl.org/news/solar-cycle-24-may-have-double-peaks-says-nasa-solar-physicist.  If this happens we may have (half) decent conditions for several years yet in this current solar cycle.

Conditions in this peak really are very different from the massive peaks in the middle and late 20th century when worldwide DX was workable with ease on the higher HF bands and even 6m. OK, it is still possible to work all over the world but, believe me, it WAS a lot easier back then.

24 hours with 1mW output on 40m

Well, that was fun: a 24 hour period with my WSPR beacon running at just 1mW RF output on 40m into the Par 10/20/40 antenna at just 5m up in the garden and yet still plenty of reports from around western Europe. Best DX reports were from F6HTL (737km) and F1ING (581km) with reports from G, PA, and F.  I shall now have a try at the same power level on 10m or 20m and see how it goes. It was interesting that there were few reports last evening and overnight on 40m, possibly because my 1mW signal was being crowded out by others running "high" power like 1-2W, HI.

Some of the reports with 1mW on 40m WSPR

A WSPR beacon TX at the 1-5mW power level is feasible with just one transistor and a single balanced diode mixer and may be one of my next "just for fun" projects.

UPDATE 1700z: on 20m WSPR with 1mW output I managed just one report this afternoon from F1JRC/2 at 971km.

Chinese FT817 a step closer?

Steve G1KQH has alerted me to a new Chinese HF SSB/CW transceiver kit called the KightKit KR-10 that retails in the USA for $259.95  Although this is a kit, it is available ready made for just $30 more. That is less than $300 for a built HF QRP rig.

The rig doesn't look very pretty, in my view, and I/ve no idea about its availability in Europe including the UK.

The spec is:

• RX frequency range: 0.1 ~ 30MHz
• TX frequency range: 0.1 ~ 30MHz
• Operating Mode: SSB / CW
• Receiving sensitivity: better than 0.45uV,
• RF output power: ≥ 4.5W
• Frequency stability: better than 0.5ppm
• Operating voltage: 12.0 ~ 14.0V DC
• RX Standby Current: 0.5A
• TX current: 1.5A Max
• Dimensions: 97 x 40 x 155 (mm)

See http://www.kightradio.com/X1M-QRP-SSBCW-Transceiver-Kit_p_305.html for more details.

Now, there are clearly signs that the Chinese are coming up fast on the HF QRP transceiver front. It surely cannot be long before a Chinese company launches an FT817 competitor. They have a tall order to exceed its spec but they've had 13 years to dissect and analyse the Yaesu radio.  

1mW (0dBm) TX on 40m WSPR

Just for fun I'm having a go at QRPp WSPR on 40m. The set-up is the FT817 on 500mW going directly into a 26dB attenuator that feeds the Par 10/20/40 end-fed longwire antenna in the garden at around 5m above ground. So far, after about 10 minutes a few spots received: G3XVL at 61km being the best DX with reports also from G4IKZ and G4NRG.

Amazing NLOS 481THz reception tonight!

This morning I realised that I was 2.5 degrees out in my aim last night with my optical beacon, so this evening I repeated the over-the-horizon optical test, moving instead to a new location fully in the beam at a distance of 4.8km. The difference was astounding! Last night I was struggling to copy the signal even with a long carrier. Tonight it would probably have been audible in 10wpm CW!

Excellent NLOS 481THz copy this evening

I ran QRSS3 tonight and was rewarded with signals 20dB over the noise in 0.34Hz bandwidth when beaming just above the horizon. At higher elevations the signal was weaker. With this strength I am very confident that with QRSS3 the signal should be copyable non line-of-sight (NLOS) out to at least 10km by forward scatter and possibly much further, even with my 1W LED running at 250mA in 100mm optics.  This was an excellent result and I am now confident the RX is working very well indeed.  Cloudbounce is another mode I have yet to properly exploit. The reception tonight was as a result of clear air scattering presumably from water droplets or dust particles.

This time I made recordings which are linked from my website. These can be played back through Spectran or Spectrum Lab software and further analysed. See https://sites.google.com/site/g3xbmqrp3/vuhf/optical/481thz-nlos .

Rapidly I am learning the absolute importance of accurate aim: 2.5 degrees out last night probably reduced the signal level by around 20dB. For serious tests over longer ranges a means of very accurately aligning the TX and RX is essential. Unlike with line-of-sight where the red dot can be seen by eye usually, NLOS requires careful alignment from map features.