472kHz WSPR overnight

No new stations copied overnight but those copied were at good strength.

UPDATE 0850z:  F5WK (364km) is still coming in on MF. I am still on 630m WSPR but may switch to 6m shortly. Not sure why as 6m has been useless here for days!

10m WSPR comes to life

With 4 spots from 4X1RF (3519km) and one from KD0VWO (7412km) looking in Brazil, 10m WSPR has sprung into life. I think both of these are F2 propagation. I am pretty sure there will be further reports later. WSPR

I am also on 472kHz RX but nothing copied on MF, as yet, this evening.

UPDATE 2000z:  Plenty of stations being copied on MF WSPR. All DX seems to have stopped hours ago on 10m so I shall close down until breakfast on 10m, but I shall be monitoring 630m WSPR overnight again.

ICOM IC7300 transceiver (more)

At the moment, the best value for money for a 100W transceiver looks like the ICOM IC7300. This is an SDR based transceiver that covers HF, 6m and 4m (in Europe). The selling price is expected to be a way below £1000, making it far less than the FT991 from Yaesu. A 10W version of the IC7300 is not available outside of Japan, sadly. The SDR based architecture means BOM (bill of material) costs should be low. Much of the RX processing is done in software. The realtime spectrum scope is a nice feature.

I quite fancy one, but may wait until some of the early problems are ironed out. It would be good to have 50W on 4m too as more and more countries are appearing on the band.

See http://www.icomamerica.com/en/products/amateur/hf/7300/default.aspx .

The image below is located on the ICOM America website and not on this blog. 

August 70cm UKAC results published

I see from the results of this contest that I managed to come 98th out of 162 in the AL section. I was pleased with this as I was just using a 2m big-wheel horizontal omni antenna and was only "on air" for around 40% of the time because of my poor, stroke affected, voice. I was only using 5W pep from my FT817. Activity levels are high in these contests and even if you don't bother to enter the contest you are almost guaranteed a QSO unless you are located in some extreme location.

472kHz sensitivity with a signal generator

With the preamp in front of the FT817 I can copy down to at least -127dBm, which is the lowest the generator will go without external attenuators. Without the preamp, sensitivity is at least 10dB worse. Of course, in reality, external noise will set the real limit. On my FT817, the IPO in/out made little difference to the sensitivity. I suppose the NF was being set  by the preamp. It is definitely worth having the preamp (with filtering) in circuit.

I am so grateful to the kind anonymous person who sent me this preamp. Thank you again. I have no idea who you are but I am extremely grateful for your great kindness. There really are some very kind people around.

Sunspots and 10m - Thurs Sept 24th 2015

Sunspot number has climbed again. It is now 95 (K=3) but 10m is again expected to remain "poor". It is your guess how 10m will be today! 

As previous days have shown, there is still some Es about around Europe, (I am sure we'd see even more if WSPR activity was greater) and F2 DX is starting to occur and even my 500mW WSPR is being spotted at some distance again (Brazil and Reunion Is.).

472kHz WSPR RX overnight with preamp

Overnight, I used the FT817 on MF RX with a preamp and the (short) earth-electrode antenna in the garden. Subjectively, the sensitivity is better and I am able to copy stations at better strength. I will do a straight comparison of sensitivity, with and without the preamp, using a signal generator later.

These are the unique station spots given to others overnight. Many stations were copied many times of course:

Unique 472kHz WSPR stations copied overnight

472kHz RX with a preamp

I am currently looking on 472kHz with the earth electrode antenna but with a preamp ahead of the FT817. Tomorrow I will check the sensitivity with and without the preamp at 472kHz using a signal generator. Already I have copied a couple of French stations at good strength.  Overnight I'll leave the system running to see what I copy. I am not on TX overnight, just RX.

UPDATE 2136z:  I managed to dislodge the laptop power lead, the battery was very low and the PC shut down, so no WSPR for some while. All now plugged in again and working. Initial results are very encouraging.

472kHz WSPR RX with preamp - to 2150z

Another good day on 10m WSPR

10m WSPR has been good again with both F2 and Es propagation. Best DX is again a spot by FR1GZ (9724km). 4X1RF has been spotting me all afternoon.This could well be F2.

Unique 10m WSPR spots today

Visible Light Communications

There is a nice precis on Wikipedia about this. It is some time since my health has allowed me to do experiments with light. My special interest is NLOS data comms. That is sending data over the horizon using light.

See https://en.wikipedia.org/wiki/Visible_light_communication .