Re: LF: WSPR LA3

["Cor PA0AM" <pa0am@online.nl>]

Special Message Formats

Normal WSPR messages consist of a callsign, 4-digit grid locator, and power level in dBm. These messages are always preferred when appropriate. However, compound callsigns (i.e., callsigns with add-on prefix or suffix) cannot fit into the 28 bits allocated in a standard message. Similarly, 6-digit locators cannot fit into 15 bits. Messages using these components are therefore sent using a two-transmission sequence. For example, if the callsign is PJ4/K1ABC, the 6-digit grid locator is FK52UD, and the power level 37 dBm, the following messages will be sent in alternating transmissions:

PJ4/K1ABC 37 <PJ4/K1ABC> FK52UD 37

If you have special need to use a 6-digit locator with a normal callsign, check the box Force transmission of 6-digit locator. If the callsign is K1ABC, the 6-digit grid locator FN42AX, and the power level 37 dBm, the following messages will then be sent in alternating transmissions:

K1ABC FN42 37 <K1ABC> FN42AX 37

Callsigns enclosed in angle brackets are actually sent as 15-bit hash codes. If such a code is received by another station before the full callsign has been received, it will be displayed as <...> on the decoded text line. Once the full callsign has been received, the decoder will thereafter recognize the hash code and fill in the blanks. Two very different callsigns might have the same hash code, but the 15-bit hash-code length ensures that in practice such collisions will be rare.

Please note that messages with compound callsigns or 6-digit locators will not be properly decoded by WSPR versions earlier than 2.0. Further details on message formats can be found in Appendix B, and in the WSPR source code.

7

From: Lee Hudson

Sent: Saturday, January 09, 2010 6:21 PM

To: rsgb_lf_group@blacksheep.org

Subject: LF: WSPR LA3

Hi Klaus,

 

Yes I'm using V2

However:

 

100109 1456   9 -22  2.4   0.503919  LA3/O28WJJ 10          -3    13    0
100109 1500   7 -24  1.6   0.503921  LA3/O28WJJ 10          -1     1    0
100109 1502   6 -25  1.8   0.503919  <...> JO28WJ 10         0     3    0
100109 1506  13 -18  1.7   0.503918  <...> JO28WJ 10        -1     1    0
100109 1508  17 -14  1.7   0.503916  LA3/O28WJJ 10           0     1    0
100109 1510  16 -16  1.8   0.503915  <...> JO28WJ 10         0     1    0
100109 1512  11 -20  1.8   0.503915  LA3/O28WJJ 10           0     1    0
100109 1516  14 -16  1.7   0.503896  LA3/O28WJJ 10          -1     6    0
100109 1518  15 -15  1.8   0.503895  <...> JO28WJ 10         0     1    0

100109 1520  15 -15  1.7   0.503896  LA3EQ/M 10              1     1    0
100109 1522  11 -19  1.8   0.503898  <LA3EQ/M> JO28WJ 10     1     1    0

 

The question I suppose is what was LA3EQ/M using to generate the transmissions,

WSPR on a PC, or something homebrew for /M use?

 

73,

Lee M0LMH.