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101. Re: LF: Re: 136kHz WSPR experiment (score: 1)
Author: Roger Lapthorn <[email protected]>
Date: Thu, 25 Jan 2018 20:48:11 +0000
Thanks Mike. I seem to remember that I got surprisingly good results with my EFP (schematic shown a few days ago) feeding into the FT817 on 136kHz, This has not be tried since before my 2013 stroke.
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00342.html (15,254 bytes)

102. Re: LF: Re: Re: 136kHz WSPR experiment (score: 1)
Author: Roger Lapthorn <[email protected]>
Date: Fri, 26 Jan 2018 11:01:58 +0000
 Roger & All:  I ran my FT-817 on 137 kHz stateside here to see how well it would work with my W1VD version of the e-probe.  Initially it was 10 to 15 dB down versus my high level LF converter that 
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00349.html (32,985 bytes)

103. Re: LF: DF6NM is the inventor of the year ! (score: 1)
Author: Roger Lapthorn <[email protected]>
Date: Sat, 27 Jan 2018 21:59:00 +0000
It's good to put a face to a name! Great stuff Marcus. 73s Roger G3XBM On 27 January 2018 at 20:11, <[email protected]> wrote: Thank-you Donenico and congrats Markus! We are very fortunate to have his ex
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00390.html (11,082 bytes)

104. LF: 136kHz WSPR RX (score: 1)
Author: Roger Lapthorn <[email protected]>
Date: Tue, 30 Jan 2018 20:03:05 +0000
Thanks to the great kindness of one on this list, I have been sent a 136kHz preamp, so I am now on the lookout for 136kHz WSPR signals this evening and overnight. If you are able to come on 136kHz WS
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00423.html (8,433 bytes)

105. Re: LF: 136kHz WSPR RX (score: 1)
Author: Roger Lapthorn <[email protected]>
Date: Tue, 30 Jan 2018 21:30:12 +0000
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00424.html (9,483 bytes)

106. LF: 136kHz WSPR RX and OPERA RX (score: 1)
Author: Roger Lapthorn <[email protected]>
Date: Wed, 31 Jan 2018 20:04:11 +0000
At the moment I am monitoring 136kHz WSPR RX and OPERA RX. As yet, nothing copied here. If anyone wants to try I'd appreciate it. 73s Roger G3XBM
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00433.html (10,234 bytes)

107. Re: LF: 136kHz WSPR RX and OPERA RX (score: 1)
Author: Roger Lapthorn <[email protected]>
Date: Wed, 31 Jan 2018 21:44:22 +0000
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-01/msg00434.html (11,410 bytes)

108. Re: LF: VLF Small magnetic antenna for Tx (score: 1)
Author: Roger Lapthorn <[email protected]>
Date: Fri, 2 Feb 2018 10:14:41 +0000
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-02/msg00008.html (19,828 bytes)

109. LF: 136kHz RX (score: 1)
Author: Roger Lapthorn <[email protected]>
Date: Fri, 2 Feb 2018 18:53:43 +0000
After sorting out the issue with my shack PC battery not charging, I am now monitoring 136kHz WSPR RX and 136kHz OPERA. The shack PC battery (to reduce noise) should be good until late tonight. I'll
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-02/msg00010.html (8,342 bytes)

110. Re: [english 97%] LF: 136kHz RX (score: 1)
Author: Roger Lapthorn <[email protected]>
Date: Fri, 2 Feb 2018 20:24:15 +0000
Yes, basically the noise level drops dramatically when charging the internal battery pack. I am sure I can get the external noise floor lower. This has got worse in the last few years. 73s Roger G3XB
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-02/msg00012.html (11,128 bytes)

111. LF: 136kHz RX (score: 1)
Author: Roger Lapthorn <[email protected]>
Date: Sat, 3 Feb 2018 17:57:52 +0000
Once again I am looking on 136kHz WSPR and OPERA. It was quite late yesterday when I realised I had the wrong antenna connected! This evening I can confirm I have the right antenna! If you are on 136
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-02/msg00018.html (8,759 bytes)

112. Re: [english 97%] LF: 136kHz RX (score: 1)
Author: Roger Lapthorn <[email protected]>
Date: Sat, 3 Feb 2018 20:14:30 +0000
Hi Mike, Well otherwise this little laptop is fine. The batteries last for ages and ages once charged (6hrs plus), so I can easily do an evening on battery power. With a late evening charge it more o
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-02/msg00021.html (12,854 bytes)

113. Re: [english 97%] LF: 136kHz RX (score: 1)
Author: Roger Lapthorn <[email protected]>
Date: Sat, 3 Feb 2018 20:49:48 +0000
What I meant was the noise floor rises dramatically when charging the shack laptop's battery. That is why I use the (charged) internal batteries when looking on 136kHz and 472kHz. 73s Roger G3XBM On
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-02/msg00023.html (12,770 bytes)

114. Re: LF: 136kHz RX (score: 1)
Author: Roger Lapthorn <[email protected]>
Date: Sat, 3 Feb 2018 22:08:41 +0000
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-02/msg00024.html (10,407 bytes)

115. LF: 136kHz (score: 1)
Author: Roger Lapthorn <[email protected]>
Date: Sun, 4 Feb 2018 19:43:52 +0000
So far this evening just G4FTC (123km) spotted on WSPR and G3XDV (61km) spotted on OPERA. 73s Roger G3XBM
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-02/msg00034.html (8,026 bytes)

116. LF: Simple transverter for 472kHz (score: 1)
Author: Roger Lapthorn <[email protected]>
Date: Thu, 8 Feb 2018 12:45:33 +0000
If you want a simple way to get started on 472kHz maybe my transverter can help? This appeared in QST and in the book "LF Today". No great claims for it are made, but you should get 10-15W out into 5
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-02/msg00123.html (8,760 bytes)

117. Re: LF: RE: Simple transverter for 472kHz (score: 1)
Author: Roger Lapthorn <[email protected]>
Date: Thu, 8 Feb 2018 13:53:30 +0000
Here is a ready to go transverter from an Australian dealer. http://www.monitorsensors.com/ham-radio/630m-transverter Not cheap,though. See also http://www.monitorsensors.com/support/news/longest-63
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-02/msg00125.html (11,481 bytes)

118. Re: LF: RE: Simple transverter for 472kHz (score: 1)
Author: Roger Lapthorn <[email protected]>
Date: Thu, 8 Feb 2018 14:04:45 +0000
Here is a ready to go transverter from an Australian dealer. http://www.monitorsensors.com/ham-radio/630m-transverter Not cheap,though. See also http://www.monitorsensors.com/support/news/longest-63
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-02/msg00127.html (12,269 bytes)

119. Re: LF: VLF and Italy... (score: 1)
Author: Roger Lapthorn <[email protected]>
Date: Fri, 23 Feb 2018 18:58:43 +0000
VLF, http://s04.flagcounter.com/flags1/dyV/1 and yesterday there were 51 visitors from Italy on my VLF grabber ( http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html ). That is far
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-02/msg00455.html (12,730 bytes)

120. Re: LF: VLF and Italy... (score: 1)
Author: Roger Lapthorn <[email protected]>
Date: Fri, 23 Feb 2018 22:06:27 +0000
VLF, http://s04.flagcounter.com/flags1/dyV/1 and yesterday there were 51 visitors from Italy on my VLF grabber ( http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html ). That is far
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-02/msg00456.html (13,670 bytes)


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