Re: LF: JA7NI in WSPR-15

[Knight Ao <ja10xx@yahoo.co.jp>]

Hi Stefan,

Since there is no modification needed for his DFCW tx, Kuni must have adopted 2FSK WSPR, hi.  Anyway, if he needs a real one, I could provide him with a SI570 based WSPR exciter or maybe and I/Q modulator. Guess he needs some more time to play with it and get used to a digital mode.

In the meantime, I have temporarily set up opds32 now, but don't know if my current setting really works!? Give me a few days before I can fully get ready.  Anyway, I will listen for you on WSPT15 tonight.

GL!

Yas - Tokyo

 

----- Original Message -----
From: Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>
To: rsgb_lf_group@blacksheep.org
Date: 2013/10/24, Thu 23:27
Subject: Re: LF: JA7NI in WSPR-15

Hi Yas,

2FSK, ooh. And this works?? Obviously.. But why not the real WSPR? Probably there is no TX converter available? I just thought about an analog circuit to modulate the xtal frequency of a normal VFO, using a varicap diode and a high Q resonance circuit, to allow TXing WSPR. Could work..

Yas, are you ready for OPDS now?
Today seems to be much better propagation to JA again. There is a first promising 10 dB SNR peak at 13:40 UTC!! If this continuea as expected, there could be a 30 dB SNR peak at 16 UTC! But first another dip will come arround 15 UTC, i.e. soon :-)
I will continue to try in WSPR-15 on 137.610 kHz.

73, Stefan/DK7FC


Am 24.10.2013 13:55, schrieb Knight Ao:

Hi Stefan,

JA7NI is using 2FSK instead of 4FSK WSPR.  JH1GVY has devised a method that can utilize a DFCW tx to transmit quasi WSPR2.  The 2FSK WSPR seems to be 3-5dB weaker, especially when there is QRN/QRM.  Even so, KL7L and UA0SNV/UA0AET might have a chance of receiving, but I don't think he is receiving WSPR for the time being. 

Yas - Tokyo

----- Original Message -----
From: Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>
To: rsgb_lf_group@blacksheep.org
Cc: Vasily Savchenko <ua0snv@yahoo.com>
Date: 2013/10/24, Thu 20:37
Subject: LF: JA7NI in WSPR-15

LF,

This morning i saw JA7NI on the WSPR database/map. As far as i know he was only QRV in QRSS/DFCW/CW during all the years. Maybe the very high number of active WSPR stns in JA convinced him to try this mode.
So far there were just "local" decodes, not sure if it was a QRP test. But it could be interesting for UA0SNV, KL7L and DU1GM? Maybe even interesting for me, if he is receiving :-)

73, Stefan/DK7FC