WSPR with the X80 and 5W

Well, here is a summary of my (intermittent) QRP WSPR beaconing tests since I erected my X80 vertical at lunchtime today:

• Bands tried 80, 40, 30, 20, 17 and 10m (reports received on all bands tried)
• Reports from 25 different stations in 14 countries and 3 continents
• Best DX 6105km on 17m

So, a reasonable test for the antenna and I believe it is working out pretty well so far.

Pasties

As a west countryman from Devon I love pasties. We occasionally make our own, but usually buy Ginsters which are not a bad pasty. For the VERY best pasty, you will be hard pressed to beat those made in the west of England by Ivor Dewdney. Fifty years ago I remember a trip shopping in Plymouth wasn't complete without eating one of these! They are still made the traditional way, by hand. Heck, I could eat one now.

SRC X80 multi-band vertical erected

My SRC X80 multi-band vertical was erected without problems this morning. Fed via about 10m of coax through the house and matched to my FT817 via the Elecraft T1 auto-ATU, it managed a decent match on all bands from 80-10m. Within 2 minutes of tuning it up I'd had two QSOs with 5W QRP CW: HA3FTA on 10m (599) and LA5CB (559) on 12m. So, promising results so far. The next test will be to try WSPR beaconing on the various bands as this is a good check of general performance.

UPDATE 1hr later: Tried WSPR at 5W on 28, 14, 10 and 7MHz and have had decent reports from around Europe on all these bands. I've just got a WSPR report from W8LIW on 18MHz at 6105km. So, it's doing a credible job.

See my webpage about the antenna: http://sites.google.com/site/g3xbmqrp/Home/x80ant

6m WSPR - and tropo?

In between other things tonight I've been running WSPR on 6m. Interestingly I seem to be able to consistently copy G8JNJ 184kms away, presumably by tropo? He's also decoded me once. Don't think it is aircraft reflection as no Doppler evident on the WSPR display. Also managed to see and be seen by EA1FAQ. I use a V2000 triband vertical on 6m.

Twin tee oscillator

A twin-tee audio oscillator is a very useful item to have around the shack. Looking around the net for suitable circuit values yesterday I came across this page by G0XAN http://homepage.ntlworld.com/g0xan/twin-t.htm

I shall be using one this week with my CW keyer to send slow CW (QRSS) on 1.2kHz and 8.97kHz. For very slow CW I'll need a much more stable oscillator probably a crystal and digital divider, although many on the "Dreamers Band" are using a DDS source.

A very young trainee engineer?

This afternoon I had some "help" from a budding radio engineer aged 2.5yrs - my young grandson. We were in the lab mending a toy fire engine (see picture) but he was more interested in twiddling the audio generator and listening to the tones and watching these on the oscilloscope. To see the video go to http://www.youtube.com/watch?v=tRwaT9s6ZHM

Latest NOAA sunspot predictions for cycle 24

The very latest sunspot predictions from NOAA for cycle 24 make rather depressing reading showing a 95% probability of a peak smoothed sunspot number of just 91.8 in June 2013. By this autumn we should see counts in the mid 40s and the following autumn around 75.  10m transatlantic openings should be common again from this autumn, but the low sunspot peak suggests 6m openings will be much less frequent than in recent cycles. So, in my lifetime it is unlikely I'll ever see again the halcyon days of the peak of 1957-9 when conditions were remarkable.

Croatia on 500kHz

9A5K has been granted an experimental licence to operate on 493-510kHz as well as on the 5MHz band from June 10th.

Good Es today

Only had a brief chance to listen on 10m and 6m today but both bands were busy with Es signals from right across Europe. The season is well and truly underway now. A brief listen on 2m did not result in any DX being heard.

SAQ (17.2kHz) CW VLF transmission Sunday July 4th

There will be a further transmission from the historic VLF transmitter at Grimeton, Sweden on July 4th at 0900 and 1200 UTC on 17.2kHz CW with tune-up 30 minutes before each transmission. E-mail to: info@alexander.n.se or fax to: +46-340-674195 or via: SM bureau or direct by mail to:

Alexander

Grimeton Veteranradios Vaenner, 

Radiostationen                          

Grimeton 72

SE-430 16 ROLFSTORP, SWEDEN

See: www.alexander.n.se

SRC X80 antenna has arrived

Well, I'm very impressed with how quickly Snowdonia Radio Company despatched my X80 multi-band Rybakov HF vertical: it arrived on my doorstep early this morning only a few days after ordering it. I shall not be able to erect it until next week though as my little grandson is staying with us until Monday. All being well, I'll erect it on Tuesday.

San Marino on 4m

The San Marino authorities have authorised 4m operation (100W max) until the Oct 31st 2010, on 70-70.5 MHz. T77C and others will operate from San Marino 19-20 June.

PLT-Interference Range Contest

The EMCIA have announced a contest to identify the interference range of Power Line Telecommunications - otherwise known as PLC or BPL.  See http://www.emcia.org/documents/News/Rules.pdf

Useful multi-band HF vertical

The Snowdonia Radio Company is offering the SRC X80, a 5.8m long multi-band HF vertical matched via a 9:1 unun matching box. This sells for just £47, which is excellent value compared with similar offerings from the Japanese manufacturers. Such Rybakov antennas offer a decent match, easily brought to 1:1 VSWR using an auto ATU, on the higher HF bands. On the higher bands performance is quite acceptable considering the compromise in size. In the latest edition of PW Magazine G6MXL reports working plenty of DX with 50-100W using one.

4m beacon in the USA

This news is about 4 weeks old, but I missed it!

A new 70.005MHz (4m) beacon  WE9XFT is operational from Virginia, USA, FM07fm. Callsign and a short message is sent continously in CW at 18 WPM/90 LPM. It's a radio science beacon for sporadic-E propagation purposes. ERP is 3 kW from a 3 el. yagi at 60°, i.e. Europe. The beacon will run 24/7 until Sept 1st. The beacon is non-amateur and sadly no 2-way QSOs can take place.  Reports via e-mail to WA1ZMS.

2-way QSO on the 8.97kHz "Dreamers Band"

DJ2LF and DF6NM held what was probably the first two-way contact on 8.97 kHz. The distance between them was 20.2 km, well outside the reactive near field zone (λ/2π = 5.3 km). In each case the radiated power was about 5uW. They used a special QSO procedure using dual frequencies. Congratulations to both stations.

Noctilucent Clouds and microwave DX?

Noctilucent, very high altitude, night time visible, clouds are becoming more common and at lower latitudes. This may be a result of climate change. One phenomenon associated with these is strong microwave radar echoes, raising the possibilty of very long distance DX by reflection from these on bands like 10GHz. This is an area ripe for experimentation but I am unaware of ANY groups anywhere investigating this exciting new propagation mode.

There is a  link between noctilucent clouds and the solar cycle with NLC activity peaking just after solar minimum, possibly because low solar activity allows the upper atmosphere to cool, promoting the growth of ice crystals that make up the clouds.  See http://spaceweather.com/

SWLing in the 1960s

Back in 1961/62, when I first got interested in shortwave listening, a friend of mine and I had an intercom across our back gardens with a long piece of twin flex and a couple of DLR5 headsets. Now my friend's dad was a bank manager and he was "rich". Paul's dad bought him a Perdio 102 multiband receiver which made me green with envy! So, late at night, under the bedclothes, we'd both share listening on the Perdio102: Paul would put it to listen on 2.182MHz (the trawler band calling frequency) and we'd often hear an emergency and the local lifeboat being called out. We'd listen for hours. On this same receiver I recall being amazed at hearing South America hams on AM. We both became hooked and not many years later got our licences. See also the radio museum pages at http://www.radiomuseum.org/r/perdio_multiband_102.html

HF transceiver ideas site

Vanyi Istvan Vanyi YO5OFJ has an excellent website with links to a whole list of HF transceiver designs from around the world. Most are QRP designs with links to the originating sites.

Amateur Radio Wiki

Not sure how I'd managed to miss this amateur radio wiki site before, but it looks worthwhile bookmarking.  Being a wiki, it allows users to add or modify content in a similar way to Wikipedia. It has some useful links and data.

Elecraft K1 stand idea

Someone was asking about a stand to angle the Elecraft K1 transceiver at a suitable angle on the operating desk. A commercial version is available, but I found a simpler solution: two large rubber feet at the front and two small ones at the back. This angles the rig up about 10-20 degrees and is perfect for operating on a desk.

6m WSPR

Just decided to do a little 6m WSPR beaconing this afternoon and evening. So far no reports of my signal, but I'm copying EA4BMG quite well. There are many more signals weakly visible on the WSPR screen but these have Doppler shift which must confuse the software decoder as only EA4BMG has been repeatedly decoded.

Concorde to fly again?

There are moves afoot to get Concorde, the supersonic jet, flying again on memorial flights and it is possible it may yet fly over London at the 2012 Olympic Games opening. The only time I've been on Concorde was at Duxford Airport in Cambridgeshire in a static display. My wife's brother used to work for BT and fly to the USA and back in a day using Concorde so he could hold meetings in New York on a day trip - how times change!

See http://news.bbc.co.uk/1/hi/world/europe/8712806.stm

The latest VLF receiver

Here is a picture of the latest version of my VLF 1-2kHz receiver for use with my 80cm loop. The version before this (Wednesday) had one less Sallen-Key active high pass filter and was able to copy my 4W grounded electrode transmissions "by ear" at 0.5kms. This latest version now has 2 sections of 50Hz active high pass filtering so should offer better S/N at the limit of range. The audio above 2kHz is attenuated by the passive LPF.

RockMite 20 QRP build video (N2JMB)

Just came across this video showing the build of a Small Wonder Labs Rock Mite 20 QRP transceiver.

Portable crystal set DXing (in 1922)

Wonderful silent movie from 1922. See http://www.britishpathe.com/record.php?id=2616st5

Building a wax cylinder player

A band called The Men That Will Not Be Blamed For Nothing is putting one track of their next album on a wax cylinder available from 1 June. Don't ask me why! This is about an attempt to make a wax cylinder player to play the new record when it becomes available, the first commercially produced cylinder in 100 years.

See http://news.bbc.co.uk/1/hi/technology/10171206.stm

0.5km on earth-mode with 4W

This evening I achieved my best results so far with 1kHz earth mode TXing on a 20m base electrode pair and receiving on an 80cm loop and listening by ear. Even this range I think can be bettered with yet more 50Hz rejection. With a PC at the receiving end I think 1km is certainly possible now.

Computer mouse problem

You must read this http://myweb.tiscali.co.uk/wgtaylor/FM.pdf . It is a true account of a PC problem that really did turn out to be a mouse problem ....a real mouse inside the PC that is.

Resonating the VLF receiver loop

Today I've been resonating my receiving loop to see if this improved things. Well, I tried it - no better. Then I improved the active high pass (50Hz) filter which got the mains hum down some more, removed an audio gain stage in the RX just leaving 2 common emitter stages. With this, 4W TX, and the loop resonated around 2kHz I did a further walk-about test. 0.42kms was the limit of range. S/N better and 50Hz hum not a problem even close to cables. The RX needs some more gain and narrower selectivity.

More earth mode experiments at 1kHz

This evening I extended my TX electrode spacings by connecting one end to the copper pipes in the house, almost doubling the effective TX baseline to about 20m. With this, my "earth mode" signals were much stronger and I was able to cover further than before in a "by ear" walk-about test around the fields locally.  Ultimate range tonight was 0.4kms using 4W (probably less as the TDA2003 was hot and probably turning down the power) and receiving on an 80cm 30t loop, active HPF, small AF amp and crystal earpiece.  Range was limited by 50Hz mains hum and background sferic noise. I must retry this set-up with my HF up-converter and FT817 this week, which has good rejection of 50Hz (and its harmonics) as well as a narrow CW filter.

San Marino on 6m QRP

Just worked T77C on 6m Es with QRP SSB. I think I've worked this station some years ago but it is one of the less common Europeans and a first for this season.

6m Es

Only had a brief chance to operate today as I was busy in the garden then out at a BBQ in the hot sunshine, but managed to work some 6m QRP Es this afternoon. Although I worked some DX last week when out pedestrian portable, this was the first 6m Es QSO this season from home. In the coming weeks we can expect 6m to be open for DX most days.

Tame Robin

Whilst out portable in Devon last week I was "visited" by this very tame robin who came so close he ate an ant from my hand. I was able to take a really close-up picture from about 20cms away. In the USA the American robin is a totally different, and larger, thrush sized bird. In the UK it is not uncommon for robins to be so tame they will come very close to you when gardening and they can be trained to eat from your hand. There was a good book called "The Life of the Robin" by David Lack published by Fontana in their New Naturalist series. This is no longer in print.

Pedestrian Portable webpage added to site.

See http://sites.google.com/site/g3xbmqrp/Home/portable for my thoughts and tips on portable HF SSB DXing. If you have further thoughts or tips please let me know. Also, I'd be interested to hear about results YOU have had with true handheld HF DXing.

M0BMU's latest complete 8.97kHz Portable Receiver

Jim Moritz M0BMU has updated his loop/preamp circuit for 8.97kHz turning it into a complete direct conversion receiver for 8.97kHz. He posted this on the LF reflector in the last few days. I have added this to my sub-9kHz website (scroll down for Jim's description and schematic on the webpage. See http://sites.google.com/site/g3xbmqrp/Home/10khz

Further 8.97kHz DX tests from Germany

DK7FC conducted more tests on 8.97kHz last weekend. Best DX was 300kms mainly because the noise levels are now higher than in the earlier tests. However it allowed Stefan to test some new equipment successfully.

Portable clifftop DXing

No updates for the last week as I was on holiday and out of internet contact. This last week I had a couple of chances to do some handheld SSB DXing with the FT817 from a Devon clifftop near Thurlestone. Although I think I stood a chance working LU2DO last night (I called and called and no-one else seemed to be hearing him), I did manage some European QSOs on 15m (HB9CVQ and a DL) and 6m SSB (IW0HLE) when running just 2.5W to a small whip antenna. I use an 8 foot long dangling wire counterpoise which helps a lot. On 6m I was just using the short helical supplied with the rig and only about 20cms long! Clifftop portable sites are magic with a decent low angle take-off, not that this matters so much with sporadic-E. In the past I've worked South America and the USA with handheld SSB.

IC7000 reliability

Some people have had issues with the reliability of the IC7000 driver transistor which gets too hot and can self-destruct. SV8YM has some modifications to help, putting improvised heatsinks on the effected devices so they run cooler. See his blog at http://sv8ym.blogspot.com/.  This is a rig I've considered purchasing but I have been concerned about the heat in such a small box and consequential reliability.

New 500kHz beacon in Norway LA1ASK/B

A temporary beacon LA1ASK/B will be operational during May until mid-June from the island of Toftöy near Bergen, Norway (locator JP20LL).  Frequency 509 kHz, mode A1A (CW), transmitter power 5 W to a 35 m vertical antenna. Reports to <post@bergenkringkaster.no> or QSL via the LA Bureau or direct, info at www.la1ask.no .