Another G1KQH bargain

This came in from Steve, G1KQH, today. It is often cheaper to buy the completed, built modules from China than to buy the parts in the UK! What is the world coming to?

I bought 5 LM317s on PCB with heatsinks for a fiver:

 

 http://www.ebay.co.uk/itm/5-x-LM317-Adjustable-Voltage-Regulator-Step-down-Power-Supply-Buck-Module-Board-/221577652687?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item33970ea9cf

 

Why bother building it any longer, that used to be half the fun! The heatsinks would of cost a Quid each over here, never mind the LM317 and the PCB with connectors..

 

Happy days 

 

73 Steve G1KQH

http://www.g1kqh.talktalk.net/

Not amateur radio - new blog

Today I started a new blog to keep a record of our visits to churches in East Anglia. We hope to visit quite a few through the year.Although the new blog is public it is primarily a record for our own use, so any inappropriate comments will be removed.

At one time we planned a full website on this subject when we retired but a blog seems more appropriate

See http://eachurches.blogspot.co.uk/ .

10m USA WSPR spots

The first spot of my 500mW 10m WSPR beacon was by KC1AWS (5308km) at 1250z.

UPDATE 2225z:   The last USA spot of my 500mW 10m WSPR beacon was KC1AWS at 1836z. I went QRT on 10m WSPR a little later, so it is just possible there might have been others later, but unlikely.

Sunspots and 10m - Jan 31st 2015

Sunspot number today was 193 (high) and 10m propagation was forecast to be "good".

How do they make a profit?

On eBay I have just seen a complete LM386 amplifier kit on a PCB for $2 with free shipping.  G1KQH has spotted Pixie transceiver kits for £5 with free shipping.  How do they make any money?

472kHz - same stations again?

I am beginning to get tired of 472kHz WSPR as the same stations are being spotted and are spotting me. It is some time since new stations have been spotted or have been spotting me.

Starting tomorrow, I think I may try a totally new band for me on WSPR. Unsure which band to try as yet. I'll stay on 472kHz overnight in case some new stations appear.

On 10m WSPR it is a similar story, although I find watching the changing conditions of interest and the DX is real DX.  The little WSPR-AXE-CW WSPR 10m beacon is also so tiny. I find it amazing that something so small and just 500mW can be heard all over the world.

10m USA WSPR spots

The first USA station to spot my 10m 500mW WSPR beacon today was KC1AWS (5308km) at 1404z. At least the band was open to the USA.

Recent 10m WSPR spots of my 500mW beacon

In a few years the best chance of copying the USA, or the USA copying me on 10m, will be on the rarer summer days with transatlantic Es.  F2 across the Atlantic will become very rare sadly, although WSPR should help to "winkle" out such openings as long as up to 2 minutes in length. The danger is people will desert the band as conditions dive. We've already seen this happen on 6m, which is a pity.

UPDATE 2024z:  The last spot of my 500mW 10m WSPR beacon was K9AN (6505km) at 1746z.  Now going QRT on 10m. Went QRT on 10m at 2034z. Still active TX and RX on 630m (472kHz) WSPR.

ET/G8DYK on 10m WSPR

I have just seen that ET/G8DYK (5931km) was spotting my 500mW 10m WSPR beacon this morning a few times. This my best DX so far today on the 10m band.

Low cost kits

See http://www.aliexpress.com/store/331885 .   This website has some very low cost rigs for sale. An example is a 40m Pixie at around $10 post free. You'd be hard pressed to buy the individual parts for less!

UPDATE 1430z:   I have just ordered a 40m Pixie kit from them.  Should be here in 2 to 3 weeks time. I hope I can manage to build it with my clumsy soldering currently.

UPDATE 2000z: G1KQH has found the same Pixie at an even better price:

Greetings Roger

 

I could of saved you a fiver out of your pension but you had to rush in:

http://www.ebay.co.uk/itm/DIY-KITS-PIXIE-HAM-RADIO-HF-40M-CW-QRP-TRANSCEIVER-7-023-7-026MHz-/121521131018?pt=LH_DefaultDomain_0&hash=item1c4b394e0a

 

73 Steve
http://www.g1kqh.talktalk.net/

Sunspots and 10m

Sunspot number today has climbed to 181.  10m is forecast to be "good".

UPDATE 1125z:  So far this morning my 10m 500mW WSPR beacon has been copied by UR/SWL56 (2283km), 4X1RF (3519km) and local G4IKZ (18km). The usual reporters! I expect the 10m band will open to the USA after lunch.

UPDATE 1447z:   The 10m band opened to the USA for me here after 1404z.

472kHz WSPR

I have been using 5mW ERP and the earth-electrode "antenna" all day.  Best spots of me today have been from stations that have copied me before such as G3WCB (101km) and G8HUH (250km). It will soon be time to change antennas.

10m USA WSPR spots today

KE6BID (5295km) was the first USA station to spot my 500mW WSPR beacon today at 1300z. As I write this at 1624z, there are plenty of USA stations spotting me still. UPDATE 1920z:   It looks like W9ZOC (6259km) was the last USA station to spot my 10m 500mW WSPR beacon at 1818z. It is over an hour since the last USA 10m spot so it is unlikely that there will be others now.

Fredbox derivatives

Since my original Fredbox 2m AM design, a number of derivatives have been designed and built around the world. This is what our hobby is all about. Although the original Fredbox worked well and its results surprised me, it was always ripe for further developments, which is healthy. My Sixbox was a 6m version and at some point, when fitter, I'd like to make a simple 10m AM version for local natters.

See https://sites.google.com/site/g3xbmqrp3/vuhf/fredbox for the original Fredbox. Click on the schematic to enlarge. Other derivative ideas are on my website www.g3xbm.co.uk.   By the way, it got its name from Fred G8BWI who was a disabled local in the Cambridge area back in the 1970s. Fred was a regular contact and he could talk for hours and hours and hours and hours zzzzzzzzzzz. RIP Fred.

Stroke update

Last year I was expecting to be fully back to my old self well before now. As it is, I am still some way from that position.

Overall, I think I am still improving, but the big leaps I was expecting don't seem to be happening. Perhaps I should be satisfied with slow, small, moderate steps?  

I still feel as if I am living in a bit of a dream world, I still feel drunk when walking (feel giddy), still tire easily, and drinking thin liquids is still not easy.

Overall, I am getting slowly better, but perhaps I should expect to be left with a level of disability and will be pleasantly surprised when I get fully fit again. Perhaps my expectations were unrealistic? Whatever, I am not giving up: I want my "old self" back again this year.

At the moment I still feel unable to do field work, climb ladders (for antenna work)  or use a soldering iron. With time, this will improve.

Sunspots up again

Sunspot number today has risen yet again. It is 140 today. 10m is expected to be "good".

4X1RF (3519km) was copying my 10m 500mW WSPR beacon at 0924z. I remain hopeful of greater DX this morning. 10m should certainly open to North America after lunch. This happens on most days.

433MHz AM modules - G6ALB progress

G6ALB has reported some progress in his tests using 433MHz AM modules, although it looks like an external linear audio transistor stage may be necessary to get best AM (voice) sensitivity from the super-regen detector. On TX he is getting 10dBm from the TX module at 5V (more with higher supply voltages) although the mod seems to be a mix of AM and FM. Our first "DX" test will probably be from G6ALB to me using the voice modulated TX module. I'll receive Andrew on my FT817ND initially. When the super-regen RX is sensitive with speech I'll try to receive him with that. Super-regens should be sensitive on AM, but are usually poor NBFM detectors.  We are about 3km apart and both have V2000 verticals externally mounted. At 70cms these have gain.

Andrew has ordered 5  pairs of 433MHz AM modules (TX as well as RX) for not much more than £2 total from China. This makes each TX/RX pair very inexpensive. It amazes me that they can make these so inexpensively. I hope G6ALB succeeds in this venture. It would be good to be able to communicate with him using a really low cost 70cm transceiver. I expect Andrew will write up his results in an article for a UK magazine later.

It seems entirely possible that a complete 70cm AM transceiver can be made for just a few pounds based on these low cost 433MHz AM modules.

10m USA WSPR spots

The first USA spot of my 10m 500mW WSPR was K9AN (6505km) at 1352z. The last USA spot was W3CSW (5886km) at 1804z. It is still possible later USA spots may happen, but it is now over an hour, so unlikely.

UPDATE 2056z:   Only local spots since W3CSW at 1804z on 10m WSPR.  Now going QRT on 10m WSPR.

29MHz AM

The 29-29.1MHz sub-band continues to be the best place to find HF AM. This is the HF band with most space, although there are AM enthusiasts on 160m and other bands. When these bands are not busy AM has its place.

When 10m goes "off the boil" 29MHz AM will be ideal for local nets with very simple gear. Ranges are fine for local nets. Also there is a ready supply of ex-CB kit around, although making a wholly homebrew QRP rig for 29MHz AM is a nice group project. There are some ideas for starters on my main website.

As an example of how effective 10m AM can be see http://www.macnaughtonart.com/10metlog-ss24.htm .

Sunspots and 10m - Jan 28th 2015

Sunspot number continues to climb and is 119 at present. For the first time in some while, 10m propagation is forecast to be "good". LZ1OI (2153km) has spotted my 10m 500mW WSPR beacon 10 times this morning already. As I write this it is 1046z.

Today could be a good 10m day.

UPDATE 2215z:   Now QRT on 10m WSPR  Although the band did open to the USA after lunch, it was a rather disappointing day on 10m WSPR for me.

50MHz UKAC session this evening

Tuesday nights are the nights for the RSGB's UKAC sessions. Tonight it is the 50MHz (6m) leg. As I only have a vertical omni-directional antenna (a V2000) it is very unlikely I'll work very much.  Add to that my poor voice and it is not a great recipe for too much success! I'll give it a brief try. The contest starts at 2000z and officially ends at 2230z. If I last 1 hour I shall be doing well.

UPDATE 2135z:   3 QSOs managed before I had to go QRT because of my poor voice - all locals. Best DX heard was G3MEH (IO91QS). Of course my antenna was the wrong polarisation.

6m QRP rigs

In many ways, 6m (50MHz) is an ideal band for experiments. Short RF leads are always good, but 6m is a forgiving band and you can get away with HF constructional techniques. It is 2MHz wide here in the UK and this means all speech modes can be fitted and used. The page below shows a number of links to 50MHz projects.

See http://www.pg1n.nl/articles.php?lng=en&pg=145 .

See also my Sixbox 6m AM transceiver .

10m WSPR - USA spots today

Although the band did not open to the USA until very late (1454z), plenty of different USA stations have been copying my 500mW WSPR beacon all afternoon. This is much better than yesterday.

The first spot of me was KZ8C (6290km). At the moment (it is 1805z) I am still being spotted by several stations in the USA.

UPDATE 1945z: The last USA spot of my 10m 500mW WSPR beacon was by K9AN (6505km) at 1902z.

Sunspots and 10m

After a miserable 10m day yesterday sunspot number today is 110 but 10m propagation is still only forecast to be "fair".

472kHz WSPR

This last 2 weeks I have been spotted by 15 unique stations on 472kHz WSPR. I am still using 5mW ERP and the earth-electrode "antenna". Several stations who have not been on WSPR so often have reappeared today.

472kHz unique reports of my 5mW ERP to earth-electrodes in last 2 weeks

70cms AM using data modules

That font of all knowledge Steve G1KQH has found a useful YouTube video:

"They are all at it now

https://www.youtube.com/watch?v=4leNjynR0DM

73 Steve
http://www.g1kqh.talktalk.net/"

10m WSPR USA spots

It is now 1232z and, as yet, no USA stations have spotted my 500mW WSPR beacon. 4X1RF (3519m) and UR/SWL56 (2283km) have spotted me many times this morning. I think the band will open to the USA and I may be a little early.

UPDATE 1336z:  Still no spots from USA stations as yet.

UPDATE 1421z:  Still no spots from USA stations as yet. I have my doubts 10m is going to open to the USA at all today.

UPDATE 1445z:  First stateside spot of my 500mW WSPR was AB4QS (7087km) at 1426z - very late indeed today.  Conditions to the USA seem poor today.

UPDATE 1545z:  Today the only USA station to have spotted me on 10m WSPR is AB4QS and he has only spotted me twice. This is definitely a very poor day on 10m compared with recent months. Usually by now I have been spotted by loads of USA stations, despite running just 500mW on WSPR.

UPDATED 1858z:  AB4QS was the last station in the USA who spotted me at a very very early 1500z. This makes today one of the worst days on 10m in months.

Poppet 160m AM transceiver

This little top band AM transmitter and a companion receiver were first published in the GQRP club SPRAT magazine. This TX version was built by M0DAD. Where the noise floor allows, 160m AM is quite popular for local nets.  There is something nice about "rolling your own" builds and getting satisfying results without spending a fortune. For daytime local use 160m AM is a great mode and rigs are simple. I am still surprised that more is not made of AM on 10m at night for local nets here in the UK.

See http://www.delboyonline.co.uk/m0dad/construcion/poppet_top_band_am_transmitter.htm.

QRP 5W CW transmitter from SM0VPO

Many years ago Harry SM0VPO worked at Pye Telecom. I had no idea back then that he was such a prolific and good designer.  This is his design for a simple HF 5W CW transmitter. His website has loads of great ideas.

See http://www.qsl.net/qrp/tx/5wtx.htm .

472kHz WSPR overnight

G0MGM (101km) has spotted my 472kHz WSPR (5mW ERP or less) several times. I think he is a new reporter and very welcome too. Tonight I may go back on the HF and 6m wire antennas (with loading coil) to see how results compare with the earth-electrode "antenna" currently in use.  
 .
G8HUH (250km) always seems to copy me.  He has a good system on RX.  He even copied me on 136kHz WSPR from the old QTH, before I had my cerebellum bleed. I have yet to try 136kHz WSPR from this QTH.

Sunspots and 10m - Jan 26th 2015

Sunspot number has climbed a little to 65 and 10m propagation is forecast to be "fair" again today.

UPDATE 0925z:  4X1RF (3519km) has already spotted my 10m 500mW WSPR beacon 4 times,which is a hopeful sign on 10m.

Not amateur radio.

This weekend was the Big Garden Birdwatch. People in the UK were asked to observe a garden, park etc. for 1 hour and record the highest number of each species seen, then submit results online to the RSPB. It has become an annual event now. I did a record yesterday in our back garden and, just for fun, I did another 1 hour today at the same time but overlooking the local museum and windmill at the front of our bungalow.

More species were seen yesterday but far more starlings were seen today as they roost on the sails of our windmill next door.

I am still active on 630m and 10m, but will be going QRT on 10m quite shortly.

Interest in AM

I note that my most popular blog posts recently relate to Amplitude Modulation (AM). Who said this was a dying mode? Clearly it is not judging by the interest levels shown. RSGB and ARRL please take note.

USA 10m WSPR spots today

The first USA station to copy my 500mW 10m WSPR beacon today was WG2Z (5600km) at 1312z. Most of the morning 4X1RF (3519km) has been copying me.

UPDATE 1924z:  CX2ABP/D (11080km) has been copying me several times this afternoon. The last USA station to spot my 500mW WSPR beacon was K1OF (5500km) at 1718z. This indeed proved to be the last spot of me from the USA.

Sunspots and 10m - Sun Jan 25th 2015

Sunspot number today is 57 and 10m propagation expected to be "fair". I definitely think solar activity is starting to fall away (on average).

Micro 40 - 40m DSB transceiver

See http://home.alphalink.com.au/~parkerp/projects/projmicro40.htm .

Also: https://aa7ee.wordpress.com/2013/10/19/the-vk3ye-micro-40-dsb-transceiver/ .

Well designed DSB transceivers are much simpler than SSB rigs as no SSB filters and mixing to final frequency is needed. They must not be over-driven to avoid a spreading signal. The PA needs to be linear too. These issues being carefully considered, you end up with a rig that has the same bandwidth as an AM rig but with a suppressed carrier. DSB transmitters are usually received as an SSB signal. The downside is that if a simple direct-conversion receiver is used then there is no rejection of stations sitting on the other sideband. So, they are best on quieter bands, rather than busy HF bands. Bands like 10m, 6m and 4m are probably good candidates.

Although not impossible, it is quite difficult to demodulate a DSB signal on a simple direct-conversion receiver. DSB rigs are ideal as simple transceivers to communicate with SSB rigs.

10m USA WSPR spots of my 500mW beacon today

WG2Z (5600km) was the first USA station to spot my 500mW 10m WSPR beacon today at 1302z. I see that FR1GZ (9724km) on Reunion Is, South Indian Ocean, has already spotted me a couple of times already on 10m WSPR today!

UPDATE 1728z:    KU4QI (6406km) was the last to spot my 500mW 10m WSPR-AXE-CW WSPR beacon at 1708z. There is still a chance others will spot me later.

UPDATE 2110z:   The last USA station to spot me was K9AN (6505km) over an hour later at 1838z. It all depends who stays around and who is active! I was surprised.

UPDATE 2140z:  I went QRT on 10m WSPR at 2112z.  I have now QSYed to MF for the night.

G8HUH - multiple spots of my 5mW ERP on 472kHz WSPR

G8HUH (250km) in IO81 square has spotted me on 472kHz WSPR 16 times so far today since the middle of the night.

Sunspots

Sunspot number is up to 70 today and 10m propagation forecast to be "fair".

UPDATE 1346z:  So far, the 10m band is behaving predictably.

70cms AM

As you may recall, I am quite a fan of super-regen receivers. Nothing as simple is able to match their AM sensitivity, but they tend to have poor selectivity.

With the availability of very low cost 433MHz modules (TX and super-regen RX) designed for AM data, these modules could be ripe for conversion to ultra-simple 70cm AM voice transceivers. One local friend, Andrew G6ALB, is currently carrying out experiments to see if this is feasible. I hope to work him on 70cm AM using such a rig in the months ahead. Sadly, I am still too clumsy to do any building work - very frustrating.

I am wondering if anyone else has tried these modules in such a circuit? With a simple MMIC PA (50 ohms in and out) the power output could be lifted to around 25mW carrier or more. With V2000 verticals this should be good for local ranges. Even at the low milliwatt level from these QRPp modules several km range should be possible with co-linear antennas.

UPDATE 2310z:   I wonder what sort of power the TX modules typically produce with linear (speech) modulation rather than 5V square wave data modulation? Presumably much less than their rated power, so an add-on PA may be essential?

South Indian Ocean on 10m WSPR

Best DX today on 10m, despite the "poor" forecast was FR1GZ (9724km) on Reunion Is who has spotted my 500mW 10m WSPR beacon 17 times this afternoon so far.  Quite a few times recently I have had very good reports on 10m from distant stations when the forecast has been "sub-optimum". It goes to prove that 10m and 6m are fickle bands: don't take propagation expectations as gospel.