LF: RE: QRP WSPR beacon

["Lee Hudson" <hudsonville@btinternet.com>]

Hi Andy, LF Group,

 

I left my station running overnight with the PA outputting 16mW from 00:10-13:00.

This supposedly equates to -10dBm erp according to Ae efficiency calculations.

But actual field strength tests still need to be made to confirm the radiated power is anywhere near as high as predicted.

 

Received consistent reports from G4FDD only a few miles away.

And a few longer spots from G3XVL and GM4SLV up until 02:32.

 

Should be interesting to see what you get from your similar power.

Hopefully you will catch a few more stations for a better feel.

 

73,

Lee M0LMH.

 

-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Andy Talbot
Sent: 31 January 2009 13:26
To: rsgb_lf_group@blacksheep.org
Subject: LF: QRP WSPR beacon

I have a QRP WSPR Beacon going on the usual 503870Hz frequency.     RF power is 100mW which gives an an estimated ERP of -6dBm - needless to say the reported power in the message is therefore wrong.

 

Its operating at 100% duty cycle at the moment while the band is quiet - if anyone has probs, just give a shout here and I'll drop the rate.

 

The WSPRnet database is showing Jim's copy of it at -29dB S/N, which compares well with the transmission an hour earlier when I made some antenna tuning tweaks and confirmed max power from the broadband PA as 140 Watts.  Jim's report on that was +2dB S/N.   31dB higher and within 0.5dB of expected.

Andy  G4JNT
www.g4jnt.com

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