JT65-HF

In an attempt to brush up on my JT65 message techniques, I shall try a few QSOs today with JT65-HF (basically JT65A). I've used this mode before successfully. Then it will be back to 2m and JT65B to see if I can make that work.

JT65 is a very weak signal mode for 2-way communications, unlike WSPR which is essentially a 1-way  beaconing mode but WSPR will work with even weaker signal levels.

UPDATE 1645z: Plenty of EU and USA stations heard on JT65-HF around 28.076MHz,  but none raised for a QSO.  Moved to 28.078MHz for JT9-1 but band was dropping out.  Will try on HF again tomorrow AM.

JT65B on 2m

This evening I had an unsuccessful JT65B sked on 2m with G4DCV in Aldershot. I was using WSJT 9.7 software. Although I could hear his JT65B tones well (and his CW) I could not once decode his callsign in JT65B despite Paul using 200W. Later I checked with GB3VHF and was easily able to copy callsign and QTH locator in JT65B mode. I shall have to try this mode again until  I succeed. I have used JT65-HF successfully on several occasions. Paul could receive me despite me using just 2W to a halo at around 135km.Several times the WSJT 9.7  reported a runtime error and closed the program.

If anyone has any ideas why I did not decode Paul's transmissions please let me know.

6m GDX

Late evening yesterday and today I have returned to WSPR with 2W to the V2000 vertical on 50.293MHz WSPR. G4IKZ 18km west of me is monitoring with a Moxon antenna and despite polarisation differences gets a strong signal from me. G8EPA (61km) is about -22dB S/N with me. No other stations copied so far. Stations in Holland and Germany are too far for tropo and I have not seen any evidence (yet anyway) of wintertime Es on 6m. I keep hoping to copy some GDX from further afield.

UPDATE WED EVENING:  Having been on 6m ALL DAY LONG and only heard G8EPA  (61km)  I have QSYed back to 10m WSPR and intend to be on with 2W overnight and all tomorrow.

UK 2m beacon back in service

GB3VHF, which was off air because of a PSU issue went back on the air again on Monday Jan 20th. Up here in Cambridgeshire it is a moderate signal on my halo and very useful as a 2m propagation indicator. At its original Wrotham site it was once much stronger (S9 +). The beacon also TXs in JT65B allowing reception at great range.

See http://www.gb3vhf.co.uk/ .

Elecraft T1 ATU gone intermittent

http://www.elecraft.com/T1/T1_photo_b1.jpg

After 8 years of good service (kit bought 2005), my Elecraft T1 auto ATU seems to be playing up and it does not want to match SWRs of around 2:1 on 40m and on other bands. I have had this issue (not tuning) before, so will have to take it apart to see what is amiss. I am going to buy another one (or a Z817 from LDG) anyway. Means I cannot pull  my slightly off-tune Par 10/20/40 antenna in on 40m. Antenna is cut too long and because of my poor health/stroke I cannot climb a ladder to adjust it.. When the ATU works it is very good indeed. Battery lasts 12 months or more and the ATU is very small - pack of playing cards in size. Ideal for the FT817 and good for up to 20W.

10m 100mW WSPR

Today I WSPRed on 10m with 100mW RF, which is a little below the output of the unmodified Ultimate 3 WSPR beacon kit. Plenty of European and near east spots (best 4X1RF 3519km) received this morning, and transatlantic propagation after lunch. First transatlantic 100mW report at 1312z was from VE3SWS 5532km away to the north of the Great Lakes and the next from KZ8C 6290k away at 1334z and ND6M at  6914km.  Best DX report with 100mW was WA5NGP at 7878km. 100mW is obviously enough to lift me above the noise floor for several stations both sides of the Atlantic, unlike with 5mW. Reports from 4 continents today with 100mW.

10m 100mW spots received today

My last transatlantic  reception was VE3SWS at 1812z (way after dark), but the last report of my 100mW signal was at 1522z. Sunspot number 131-136 today.

Magic (well nearly) on 40m

This evening on 40m I returned to 2W out WSPR to my low Par 10/20/40 antenna. Initially the reports were from G4IKZ who is 18km west of me and they were not brilliant.  I was about to go QRT when my very next reports were from Western Australia (VK6XT) at 14719km and Tasmania, Australia (VK7BO) at 17244km.

Such is the MAGIC of HF propagation. With my low antennas I think 2W is a sensible WSPR RF power level. I have already proved that as low as 5mW gets some reports even with my antenna, but 2W is the level I really need to check propagation. It may well be much lower power if your 40m antenna is half decent.

Overnight there were plenty of stateside reports too. 40m is a good " all round the clock" WSPR band.

QRPp WSPR and small antennas

One thing the last few days of 5mW WSPR beaconing has taught me is others must be using better antennas than me.

At 5mW I am really struggling, whereas, for some, DX reports still flow in at this very low power level. All my antennas are low and compromised which is why 1-2W is a more sensible level for me. I suspect my ERP is lower than other QRPp stations when I use 5mW RF. Nonetheless, it was an experiment well worth doing.

In the end, 4X1RF at 3519km was my only report with 5mW on 10m.  I had no luck with transatlantic reports despite myself copying plenty of US and Canadian stations yet again,even with a 20dB attenuator in circuit.

From tomorrow I propose to run 100mW RF on 10m being much the same as the unmodified Ultimate 3 kit, although I intend to run 1-2W on my final version.

UPDATE 1700z:  10m closed transatlantic at 1700z.

10m 5mW WSPR so far

After beaconing at 5mW WSPR on 10m all afternoon, I have received not a single spot so far.

20dB attenuator directly on 500mW output of FT817 (note chokes on ground side)

I have copied many stateside stations today and yesterday. On Monday morning my 5mW 10m beacon as spotted by 4X1RF at 3519km, a new 5mW DX record for me. RX reports suggest reception in N.America of the 5mW beacon might  be possible, but no luck as yet.

10m WSPR spots, 5mW TX and RX via 20dB pad

40m 5mW Summary

After leaving the 5mW 40m WSPR beacon running for 24 hours, this is the summary.

In all I received 7 spots in that period with the best DX being a single report from Italy and a couple of reports from Denmark.

In all, quite an interesting exercise with very low power.  Clearly  my signal was sitting in the noise most of the time, being just over the noise floor on a few rare occasions for very small number of stations. I am convinced that 2W RF is a better level to aim for in any dedicated WSPR beacon. Even with a 20dB pad in series with the FT817 output, I was still copying stations from near and far including VK6XT on 40m. On TX it was much harder to be copied.

 40m 5mW WSPR spots received

Still, with my modest, low, 40m antenna 1183km is not bad with just 5mW. See later post about 10m results.