Hi all
This morning at 10 m band I`m received this one,
0910 -20 4.4 28.126173 -1 32B/PN7UPE 53
who knows this call and who received??

Hi All !

Since a few days my Locator Suffix is missing in the WSPR Database.
Now it is "JO50", but it should be "JO50cb".

Any idea what has happened ?

73 peter dl6nl

2013-01-13 07:28 KD8GBK 1.838034 -33 0 EN56st 5 F5OIH JN06ci 6384 55
2013-01-13 06:58 K9PAW 1.838189 -25 0 EN61ar 1 F5OIH JN06ci 6685 53
2013-01-13 07:22 K9PAW 1.838189 -23 0 EN61ar 1 F5OIH JN06ci 6685 53
2013-01-13 07:10 K9PAW 1.838189 -23 0 EN61ar 1 F5OIH JN06ci 6685 53
2013-01-13 01:06 K5DNL 1.838069 -30 0 EM15lj 50 F5OIH JN06ci 7742 47
2013-01-13 02:54 K5DNL 1.838069 -27 0 EM15lj 50 F5OIH JN06ci 7742 47
2013-01-13 02:44 K5DNL 1.838069 -28 0 EM15lj 50 F5OIH JN06ci 7742 47
2013-01-13 02:02 K5DNL 1.838068 -28 0 EM15lj 50 F5OIH JN06ci 7742 47
2013-01-13 01:16 K5DNL 1.838069 -30 0 EM15lj 50 F5OIH JN06ci 7742 47

73 de Vincent F5OIH / JN06CI

30 at 04:15UTC still good. Receiving eastern Europe on the east coast of the US

2013-01-11 12:18 DL5AKF 14.097140 0 0 JO50mx 0.05 F5OIH JN06ci 946 241
2013-01-11 11:02 DL1FX 14.097123 -11 0 JN49gr 0.1 F5OIH JN06ci 724 242
2013-01-12 00:06 F4DTL 0.475666 -16 0 JN18fp 0.2 F5OIH JN06ci 306 214
2013-01-11 23:44 F5WK 0.475716 -20 0 JN18hp 0.2 F5OIH JN06ci 313 216

2013-01-11 09:04 ZL4VV 14.097036 -18 0 RE79mc 5 F5OIH JN06ci 19280 327
2013-01-11 08:36 ZL4VV 14.097037 -16 0 RE79mc 5 F5OIH JN06ci 19280 327
2013-01-11 08:30 ZL4VV 14.097037 -14 0 RE79mc 5 F5OIH JN06ci 19280 327
2013-01-11 08:26 ZL4VV 14.097037 -18 0 RE79mc 5 F5OIH JN06ci 19280 327
2013-01-11 08:18 ZL4VV 14.097071 -14 0 RE79mc 5 F5OIH JN06ci 19280 327

Excellent, managed to master Ubuntu enough to install WSJT and WSPR this afternoon.
Now up and running again at a new QTH, hope to be very active once more now I'm not tied to windoze.
Just need a good time synch for the clock.

I decided it would be fun to process all of the spots in the spot database since the beginning (March 2008) and keep track of various "records", i.e. the top 25 spots per callsign in various categories. I had to pre-process some of the data to remove duplicates and properly sort LF/MF bands (newer monthly archive files have better filters applied, but corrections were never made to older data).

I chose to only allow one "record" per callsign in each category, otherwise some categories would be totally dominated by only one or two callsigns. For example PI4THT is a club station that runs a wideband receiver which is simultaneously receiving on most, if not all, amateur bands.

Currently I have not processed spots for transmit "records". My concern is keeping transmit statistics might encourage bad behavior (e.g. not reporting the correct transmit power and/or transmitting with excessive power).

Note that if there was a tie for the 25th spot I continued with results for another 10 entries if that would cover all of the tied entries. Otherwise I arbitrarily cut off the list at 25 entries and report how many more ties there are. Also, within a group of tied entries the "tiebreaker" is the starting time.

Anyway, here are the results:

WSPR Receive Records

I may look into automating this if there is enough interest. Comments? Suggestions?

New radio, need to get it cabled up.

today Sunday 6 Jan 1255
using 3 element SteppIR at 45 ft

Sorry to say that the participants in the ARRL RTTY Roundup 2013 have camped themselves all over WSPR on 20. Thats why I like the WARC bands so much.

homebuild SDR trx based on Flex1000 software: PowerSDR 2.5.3 Liniair amplifier homebuild 100W . Antennae wire dipole 2x 20m

I just finished construction of Jay Wilson's kit with the addition of a low pass filter from Kits-and-parts.
I attached the low pass board right above the WSPR-AXE board.
Broke the PC trace going to the output BNC and inserted the low pass filter.
Tomorrow I will strip the outer insulation from some RG-58 and fold back the braid to make a 1/4 wave vertical coax dipole.
I will run it up with a fiberglass surf fishing rod and get it on the air.
And will do it on the first day of a new year.
Who-Ya!

What a great kit!

Pete W6LAW
==================

Just beginning to spend some quality time setting up WSPR to receive on my old trusty Yaesu FT840. That's what extended holiday vacations are for.

After years of WSPR-ing I decided to give two meters WSPR a try.
The radio has CI-V (CAT) commands for setting frequency but not
transmit/receive. So I went into the microphone input so I could
use VOX to key the transmitter.

The 706 stock oscillator is nowhere near stable enough.
I tried the little German crystal heater but I couldn't get
the expected results. It couldn't counter the temperature
variation from the fan going full tilt during transmit.

I picked up a synthesized signal generator with 10 MHz reference
input. That is now set to 60 MHz and injection locks the
706's oscillator.

Currently I cannot have both CI-V and RTS push-to-talk on the same port.
Accessing the port for CI-V data automatically asserts RTS and DTR.
So I have to choose between using CI-V and the data connector.
By bye CI-V.

I also found out that I had to select 1200 baud data on the 706
for WSPR to work.

Now to see if any of this actually works on Two.

Santa gave me a new WSPR transmitter for Christmas, the kit arrived from England well before christmas and was assembled in a few hours, since then it has been running on the bench, as I played with its many (9) different modes of operation.

Then came the task of putting it in a box and adding the finishing touches, and finally the big moment yesterday I connected it to the antenna.

What can you expect from two intergrated circuits, one a 74HC00 logic chip the other a small AT microcontroller with two 2N7000 MOSFETs as the PA, running from a 5 Volt supply pulling 110mA on transmit, the answer is 8.4volts P/P on 50 ohms, a quick calculation 175mW, increasing the PA volts (only) to 6 Volts produced the desired 9V P/P or 200mw RF output.

A quick touch up of the frequency to 10.140170MHz, selecting WSPR Mode and setting the realtime clock to UTC and into the antenna, a Vertical Moxon Rectangle (top at 30 ft reflector at 6ft) a real NVIS cloud warmer, SWR 1.2:1 and fingers crossed, where will my 200mW go.

Two and a half minutes later the answer a +10 s/n spot from VK4TMH 507km away a good start, as the afternoon progresses the reports get better VK5ZEA @ 1.817km, WA2YUN @ 5,409km, KL1X @ 11,169km, W5Olf @ 12,805, then just before bedtime several -28 s/n spots from OH8GKP @ 14,502km.(a total over 75 spots in 5 hours)

A quick final technical check, 200mW yes, the 2n7000's do run a little warm at that, but at 60 cents each that is not a worry, the realtime clock once set has kept time to better than a second (or my windows computer without help), the frequency has slowly drifted a few Hz with a 5 degree C change in ambient temperature.
(I am not at this stage using the external GPS time frequency input option provided in the software).

So we now have a viable battery powered, stand alone 200mW WSPR Beacon transmitter that works. (time to think about a small solar panel battery charger)

Usually when we talk about getting signal below noise, we imply spread spectrum. WSPR is no spread spectrum. On the universal conservation of energy perspective, spread spectrum spreading gain is no different from measuring input noise with a wide bandwidth filter and getting the signal with a narrow bandwidth (usually matched filter). WSPR belongs to the latter. So we need to estimate the real WSPR SNR with respect to the signal's noise bandwidth.

I estimated the minimum channel BER that WSPR FEC begins to work properly is 1.3 x 10^-2 or less. Theoretically for a 4-ary FSK to deliver this BER will require Eb/No ~ 7 dB. Unlike well known M-ary PSK, M-ary FSK is front loaded in terms of M vs Eb/No, ie larger M has smaller Eb/No. However, I believe WSPR needs ~ 9 dB Eb/No theoretically to deliver the starting minimum channel BER because WSPR delivers FEC protected signals at 1 bit per Hz per symbol. The 2-bits per Hz as a 4-ary FSK would deliver is for the convenience of Sync implementation. Therefore SNR > 4 dB is necessary for WSPR to work without counting the implementation losses.

WSPR display is referenced to a 2.5 KHz noise bandwidth. If we use 6 Hz signal bandwidth, the signal noise floor would be -26.2 dB, then the minimum signal energy needs to be at least -22 dB. This is obviously not the case, as I have seen as low as -29 dB often reported by my FT897--G5RV: 20 feet above ground--UBuntu 12.10 setup ( OK... I know about the antenna height deficiency). If we assume the decoding is based on the instantaneous single FFT bin energy of the 1.46 Hz symbol, then this signal bin noise floor will be -32.23 dB, and the minimum signal energy needed will be somewhere about -28 dB. This number would make sense. Firstly, we are getting only 1 bit per symbol detection, and secondly, unrelated but relevant, WSPR code only corrects down to 2 dB accuracy. I would like to know if I am totally off the garden path...Jonathon Cheah (NZØC)

I have enjoyed my first week using WSPR and have made regular postings on the facebook group, I shall be concentrating on 2M over the Christmas period.

Merry Christmas and a Happy New year

Martin
2E0JZT
IO92AK
Birmingham, UK
2e0jzt@gmail.com

What's the consensus of opinion on the advantage WSPR has over, say SSB. So, suppose I can "work" a tasty DX from IO82 on 5W WSPR, what would I need to work him on SSB?

I think it's at least 15dB. Probably a lot more.