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Re: LF: On air again in LF WSPR-15

To: [email protected]
Subject: Re: LF: On air again in LF WSPR-15
From: Daniele Caccia <[email protected]>
Date: Thu, 22 Nov 2018 12:40:45 +0100
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Ciao Luis!

2018-11-21 19:46  EA5DOM  0.137603  -36  0  IM98xn  1  I55387FI  JN52hx  1023  58  
2018-11-21 19:16  EA5DOM  0.137603  -37  1  IM98xn  1  I55387FI  JN52hx  1023  58 

Yesterday evening with a crazy noise, received !!!

Daniele Caccia
I55387FI  from ITALY jn52hx

Il giorno mer 21 nov 2018 alle ore 10:29 VIGILANT Luis Fernández <[email protected]> ha scritto:



After some time of forced QRT I’m again on air transmitting LF WSPR-15


Tried a first transmission in WSPR-2 yesterday at 19:30 and all the rest were WSPR-15 at minute 15 and 45

Found a “safe” combination of PA power for the 15min Tx. Need to modify the PA providing

proper cooling. Anyway last night could work at 1600mA RF using a [email protected] power supply


Got many spots from Paul, N1BUG but noting from Russia side. Completely different from Stefan

which got a single decode from Paul, eleven decodes from Ruben EB8ARZ  and many from four Russian stations


I’m in contact with Alex, LU8YD to setup his Rx in WSPR-15 using WSJT-X and the modifications

mentioned in this reflector. May be we can get some sourprises from South Amercia in LF. Worth a try


Talking about transistors, I purchased a pair of little beasts. This are TO-247 devices

rated 1Kw max dissipation and 500V 60A 0.1Ohm Rds. And the price is not so high for low quantities

€6.90 at Farnell for less than 5 pieces


It does not mean you can squeeze them to 1Kw but for a G0MRF classD PA they always run safely

so will last long and hopefully worth the purchase. For those interested, the device is made by IXYS



About WSPR-15 notification to SWLs I added a post to the WSPRNET forum


Some of the posts can be seen in the initial page at  but seems that they are selected manually by

administrators, so there can be some delay to see it in first page. Hope they can spread the news, because there are still many

SWLs using WSPR-2 only in LF, specially in north America. Would be also interesting to get the US Tx stations in WSPR-15 too

That would speed up transition. This is a RARE event this days, updating to an “old” mode. May be Microsoft take note of it and be

back to Win7  ;-)


73 de Luis


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