Pixie Files

My assembled 40m Pixie

The Pixie is a very simple HF transceiver. Usual power out is in the 200-1000mW region, depending on band and DC power source.  It was first developed some years ago but the basic concept is using a PA transistor as a mixer in a simple direct-conversion receiver. On TX this is used as the TX PA.

Being simple, it has a number of limitations but it certainly works. A major issue can be AM broadcast breakthrough, although my 40m version is perfectly usable. I was very impressed with my little kit that came with all parts including a silk-screened PCB, all sockets and a crystal. It needed low-Z Walkman type headphones, a morse key and battery - that was all. On 40m the sensitivity is pretty good with 0.5uV clearly audible and my RF power out is around 400mW. A lack of both RF and AF RX selectivity is also noticeable.

Kits are available from several sources at prices that are hard to beat. I recently bought a kit for $10 with free airmail from China. It is available for less than half this price I subsequently found out. Unbelievable for a fully functional HF transceiver. Of course, being so simple you may prefer just to build it dead-bug fashion. I bought a kit as I wanted to see how my building skills were.

As a mature design, it has been through several iterations, some improve the basic design, but most do so at the expense of increased complexity. You'd be hard pressed to find a circuit for a complete HF CW transceiver much simpler.

See www.gqrp.com/The_Sprat_Pixie_File.pdf .

10m, 630m and 2200m WSPR

My little WSPR-AXE-CW beacon has been on 10m about 30 minutes. So far just G4IKZ (18km) spotting me but it is very early still. We are now approaching the Es season so there should soon be lots of Europeans on the band.

No new 472kHz stations overnight.

UPDATE 1026z:  Just G4IKZ so far today with zero DX on 10m o far. A disappointing morning so far on 10m WSPR. Of course, things may improve but the absence of even stations on the edge of Europe suggests a USA opening today is less probable.

UPDATE 1032z:   Only G3THQ (88km) spotting me on 472kHz WSPR and this was hours ago. All very quiet. I think there are fewer stations active on this band and mode than before? This certainly seems to be the case in daytime.

UPDATE 1325z:  Only 1 spot from EA8BVP (2986km) on 10m WSPR all day apart from local G4IKZ. So far a totally dismal day on 10m WSPR!

UPDATE 1800z:   Several spots from EA8BVP (2986km) but still no spots at all from the USA. Conditions across the Atlantic seem far worse now than a few months ago.

Maybe I need to try a new band? I fancy trying 136kHz (2200m) WSPR from this QTH as I think my earth electrode will be more efficient (bigger "loop in the ground") as I go lower in frequency. My best 136kHz WSPR DX from the old QTH was 250km. Some locals and semi-locals might copy me on 136kHz WSPR, although activity is very low on this lower band in the UK. I think some skeds would be needed.

Sunspots and 10m - Mon March 30th 2015

Sunspot number has dropped to 73 and 10m is again expected to be "fair". With k=2 I guess we may see some 10m WSPR spots from the USA later.

New soldering iron on order and beating disabilities

Based on recommendations, I ordered a new Antex soldering iron which should arrive later this week. In the meantime I'll try to assemble (find!) my kit for both VLF earth-mode and optical comms field work.  I am still getting very tired, so don't expect too much too soon.

The first tests will be very modest to get me back into "the swing of things".  Unless my health starts to make a big improvement, I fear I may have to live with some of my symptoms for the foreseeable future, if not for ever. This would be such a pity as there is so much I want to do. Compared with some though, I have been lucky. If at all possible, I really want to beat my disabilities. I hate being so useless. I remember my "old self" full of energy.

472kHz WSPR

I have remained active all day on MF, but WSPRnet only shows stations spotted in the last 10 minutes, so if there is no-one else spotting you, you do not get shown as being active. This is a pity, as it does not encourage people to take a look. Instead they may look elsewhere. I don't know why there is this 10 minute rule, but personally I find it unhelpful. It would be better to show all stations active, whether or not they are being reported.

UPDATE 1845z:  G4AYT (114km) has been copying me weakly, but consistently, for some time. He is located on the North Kent coast (JO01mi).

UPDATE 2022z:  M0PPP (182km), in IO93gm square, has been spotted here consistently this evening on my earth-electrode "antenna" and deaf FT817 RX on 472kHz WSPR.

UPDATE 2145z:  PA0RDT (243km) is now spotting me.

10m USA WSPR spots - none yet

It is currently 1512z and, so far, no sign of my 10m 500mW WSPR beacon being spotted in the USA. Based on recent days when openings have, on the whole, been poor, I guess I should give it several more hours to see if the band does open across the North Atlantic to the USA and Canada. Local time is now an hour later as we are now on BST. here in the UK. It will remain light here until around 7.30pm local time.

UPDATE 1706z:  Still no sign of any spots on 10m of my 500mW WSPR beacon by any USA stations. Maybe later?

UPDATE 1902z:  Still no sign at all of any spots from the USA. Unless USA stations start to spot my 10m WSPR soon, I suspect today will be another fruitless day to the states.

UPDATE 1930z:   I think there will be no 10m USA spots of me today.  Still no USA stations spotting me still on 10m WSPR.

UPDATE 2008z:   EA8BVP (2986km) has spotted my 10m 500mW beacon 99 times today, but no USA spots the whole day. I suspect EA8BVP may have closed down as his last spot of me was at 2002z.

Fell at the first fence!

Well, what a brilliant start! NOT.

My soldering iron has failed and I cannot find the replacement as my wife packed everything when I was in hospital, so I cannot do anything that involves soldering, which is just about everything with field work. So, as I cannot afford a new Weller soldering station, I shall have to invest in a new Maplins sourced soldering iron or soldering station. Just trying to find bits in boxes has just about flattened me too. I am now exhausted.  Bother, and I was so looking forward to this day.

Any recommendations for a decent soldering iron, not Weller?

VLF experiment?

VLF 5W TX beacon (as now)

Although I still feel unwell because of the after-effects of my stroke, I feel in the mood for some field work for the first time in a very long time.

I'll try to optimise the match of my VLF earth-mode QRSS3 beacon to my earth-electrodes as a first step.  This alone will probably exhaust me as it will probably mean re-winding a 3C90 toroid.

I can transmit a crystal derived, stable signal at 8.97kHz. Once done, I'll copy this on another PC in the lounge running Spectran software. If this all works, I'll go to my nearest test site to see what copy is like using a RX loop and preamp.

Sunspots and 10m - Sun March 29th 2015

Sunspot number has dropped back a bit to 82 today and 10m propagation is again expected to be "fair"., which is the same as recent days.

EA8BVP (2986km) has spotted my 10m 500mW WSPR beacon many times already this morning, but nothing reported from elsewhere as yet.

UPDATE 1106z:  I see that TA2AEG (2547km) has also spotted me a few times now as well.

472kHz WSPR

No new MF stations spotting me, just the same ones! My best spot this evening is currently from PA3ABK/2 (306km). We'll see if I am spotted by any new reporters overnight or if I spot any new DX. Somehow I doubt this.

I need to switch back from the earth-electrodes to my strapped feeder antenna to compare results. I've been using the earth-electrode "antenna" for several months now.