Elector valve radio kit

Not having built valve radios (far too young at 62, HI HI!) my eyes were drawn to the latest offer from Elector magazine for a complete valve radio kit built into a neat wooden case. See https://www.elektor.com/Uploads/2011/6/Valve-Radio-Kit.pdf. This uses a low voltage valve (6J1) in a regenerative design with a transistor audio amp. At around £50 with shipping it is not cheap, but it is a complete kit. For the offer see https://www.elektor.com/extra/valve-radio.1843103.lynkx .

WSPRnet database issues

Several times in recent weeks the WSPR on-line database has been unavailable. Not sure what the problems are. It is a pity as this database of reported WSPR spots is a remarkably useful resource. Maybe it is simply that there are too many users now and the database cannot cope? Like many, I'd like to thank all involved in providing and maintaining this database - thank you guys.

Amateur VLF transmissions this week

G3XIZ as received at 45km 4.6.11

Both Marcus DF6NM and Chris G3XIZ have been active on VLF this last few days. G3XIZ was a good signal on 8.976662kHz with his improved antenna and DF6NM has been copied in Yorkshire by Paul Nicholson. Although QRN can be a problem at this time of the year there is still activity. The screen shot here shows G3XIZ's VLF signal with me today.

6m WSPR

At this time of the year 6m is a great band for sporadic-E DXing with QRP and simple antennas. All of Europe and North Africa is in range with 5W SSB and a dipole, halo or small vertical. At the moment I'm putting my WSPR beacon on 6m whenever I can in the hope of catching some short openings in unusual directions. Best DX reports so far are to/from CN8LI in Morocco at 2113km. With some luck, the band will open up to the USA and Canada soon (multi-hop Es) and I'll get some spots from across the Atlantic on 6m.

The Elecraft KX3 Ultra-portable multimode QRP rig

There is much excitement about the latest product from Elecraft, the KX3. This was announced at Dayton and it looks like a marvellous addition to the Elecraft range. See http://www.elecraft.com .

The RSGB Luso Tower fiasco

Some time back, the RSGB bought a huge Luso tower - list price £31k, although they got it for less - but are now selling it for £13.5k as they can't get planning permission for it at their new home at Bletchley Park.  What has this sort of monster got to do with amateur radio? What sort of example is our national society giving to newcomers? Pay BIG money for everything to get a BIG mast, BIG yagi, BIG rig and BIG linear?

The RSGB must give more of a lead by showing that this does not have to be a "fat cheque book" hobby and that simple, low cost, equipment can be effective. RadCom does carry some excellent articles, but I fear many newcomers reading the magazine would come away thinking it's an expensive hobby.

10m Sporadic-E and BIG signals

As an example of just how strong signals can be on 10m with strong Es conditions take the reports this afternoon from DJ0ABR. With 500mW to my halo he was giving me a WSPR report of +7dB S/N. This suggests I'd still be OK with just 500uW from the transmitter. I know others have achieve far better than this but it does remind you that a big sporadic-E "cloud" acts as a very good mirror.

Sepura introduce intrinsically safe TETRA portable

My colleagues at my old company, Sepura, have just released details of their new ATEX intrinsically safe TETRA portable. From my own experience of designing intrinsically safe products (PF2UBIIC, EXPF85) this is a far from easy task, especially today when the tests are even more extreme and challenging. Well done to the team involved.

Intrinsically safe radios are designed to be used in very hazardous locations such as oil refineries or petrochemical plants where the risk of explosion is high. They are designed to be safe even in certain fault conditions.

My first JT65 QSO

Although I've listened/looked at received signals with this mode, this morning I had my first ever JT65 QSO (using QRP of course) with EA1YV on 14.076MHz. I used the JT65-HF package with the simplified interface for HF QSOs. It worked a treat. See http://physics.princeton.edu/pulsar/K1JT/JT65.pdf.

As I've no antenna for 20m I just used my 10m halo tuned via the Elecraft T1 auto-ATU.

4m transverter - some builder feedback

Just got this very nice email about my 4m transverter:

Hi Roger,

               My name is Mark (mi0bdz) and I was browsing the net for 70mhz projects when I came upon your site. I could hardly believe the simplicity of the little 70mhz  transverter you designed and built. I decided to copy it. I started on Friday afternoon after gathering the bits together and completed it by Saturday evening. I could not have done this without thanking you for sharing the project,  which I class as the best usable project I have come across in many years.

   I have found that by careful selection of the TX transistors and bias resistors that 3 watts is possible. I did have to alter the values of the bias resistors quite a bit, but that is all. Everything else is as your schematic. Thankyou again for a wonderful little project. This is a gem. The sensitivity is also excellent. You were right about packing a lot into a chip indeed. Thanks again Roger.

  Regards

             Mark