LF: Re: WSPR MF

[Minto Witteveen <minto.witteveen@gmail.com>]

..and I just received a PM from Marco DD7P that he decodes my WSPR-15 just fine!

So an FSK freq deviation of nearly 5% is handled just fine.

 

Minto pa3bca

 

 

 

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From: Minto Witteveen

Sent: Wednesday, February 06, 2013 23:09

To: rsgb_lf_group@blacksheep.org

Subject: Re: WSPR MF

 

Hmm I just found an email (to this group) from Andy G4JNT, dated 17 jan 2013.

w.r.t the AD9850 and WSPR-15 he writes the following:

 

Incidently, the low cost AD9850 DDS modules with their 125MHz clocks
do not have good enough frequency resolution at 0.029Hz. You'll need
to replace the clock with one running at a lower frequency. 10MHz
would be a good choice as that will allow easy upgrade to a higher
spec reference later.

But your experiments proved otherwise.

Andy (if you’re reading this), do you have information on the maximum allowed frequency and timing deviations for WSPR(2/15)? The Internet has failed me

Regards, Minto pa3bca

 

 

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From: Minto Witteveen

Sent: Wednesday, February 06, 2013 23:01

To: rsgb_lf_group@blacksheep.org

Subject: Re: WSPR MF

 

Hi Marcus,

 

That’s good to hear. So it seems that WSPR is more forgiving than the documentation suggest and I expected (giving the tone separation with a 4 digit accuracy...)

 

Regards, Minto pa3bca

 

 

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From: Markus Vester

Sent: Wednesday, February 06, 2013 22:51

To: rsgb_lf_group@blacksheep.org

Subject: Re: LF: Re: WSPR MF

 

Hi Minto,

 

I recently tried the same device for a local WSPR 15 test and had the same concern about DDS step size, but it decoded ok immediately.

 

73, Markus (DF6NM)

From: Minto Witteveen

Sent: Wednesday, February 06, 2013 9:58 PM

To: rsgb_lf_group@blacksheep.org

Subject: LF: Re: WSPR MF

 

I am currently TX-ing WSPR-15 @ 472800..
Just finished WSPR-15 programming in my PIC controlled AD9850 + 100W TX
'Normal' WSPR works fine (got lots of spots today) but with a tone
separation of only 0.1831 Hz for WSPR-15 the error in FSK tone separation is
nearly  5%:
Minimum stepsize of the AD9850 = 125.000.000 / (2^32) = 0.0291 Hz. 6 *
0.0291 = 0.1746 Hz in stead of 0.1831 = -4.6% too low

We'll see.

Minto pa3bca




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-----Original Message-----
From: Roman RW3ADB
Sent: Wednesday, February 06, 2013 21:17
To: rsgb_lf_group@blacksheep.org
Subject: RE: LF: WSPR MF


Who is planning to TX today?



Roman RW3ADB.

> Wed Feb 06 2013 21:38:39 GMT+0400 (Local Standard Time) пользователь Andy
> (uw8sm@rambler.ru) написал:
>
> WSPR-15
> 2300 -34 -1.3      0.475805    0    M0BMU IO91 37
> 0000 -28 -0.6      0.475811    0    M0BMU IO91 37
> 0030 -34    0.1      0.475811    0    M0BMU IO91 37
> 0030 -18 -4.3      0.475821    0    DK7FC JN49 30
> WSPR-2
> 130205 2036      7 -25 -0.2      0.475696    DK7FC JN49 30
> 0          8        0
> 130205 2208      8 -23 -0.6      0.475785    PA0A JO33 33
> 0          1        0
> 130205 2254      9 -22 -0.5      0.475695    DK7FC JN49 30
> 0          2        0
> 130205 2306    12 -20 -0.6      0.475695    DK7FC JN49 30
> 0          1        0
> 130205 2318    14 -17 -0.5      0.475695    DK7FC JN49 30
> 0          1        0
> 130205 2324      9 -22 -1.1      0.475695    DK7FC JN49 30
> 0          1        0
> 130205 2330      7 -23 -0.5      0.475695    DK7FC JN49 30
> 0        55        0
> 130205 2342    16 -15 -0.7      0.475695    DK7FC JN49 30
> 0          1        0
> 130205 2348      9 -20 -0.2      0.475696    DK7FC JN49 30
> 1          9        0
> 130206 0012    11 -19 -0.4      0.475695    DK7FC JN49 30
> 0        22        0
> 130206 0024      7 -25 -0.3      0.475695    DK7FC JN49 30
> 0          8        0
> 130206 0036    10 -19 -0.3      0.475696    DK7FC JN49 30
> 0          1        0
> 130206 0042    10 -19 -0.6      0.475696    DK7FC JN49 30
> 0          1        0
> 130206 0048      6 -23 -0.2      0.475696    DK7FC JN49 30
> 0          2        0
> 130206 0100      7 -23 -0.3      0.475696    DK7FC JN49 30
> 0          1        0
> 130206 0106      7 -22 -0.2      0.475696    DK7FC JN49 30
> 0        31        0
> 130206 0112      5 -24 -0.3      0.475696    DK7FC JN49 30
> 0          9        0
> 130206 0118      6 -24 -0.2      0.475695    DK7FC JN49
>    -1    3769        0
> 130206 0212      5 -23 -0.4      0.475696    DK7FC JN49 30
> 1    7912    -12
> 130206 0218      8 -22 -0.3      0.475696    DK7FC JN49 30
> 0          4        0
> 130206 0230      9 -21 -0.5      0.475696    DK7FC JN49 30
> 0          3        0
> 130206 0248    10 -20 -0.3      0.475696    DK7FC JN49 30
> 0          1        0
> >
>
> --
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