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81. Re: LF: AW: VO1NA on 137.777 (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Mon, 28 Sep 2015 16:43:54 +0100
Joe (VO1NA), last night (27.28 Sep) your sigs were very good when I switched on at 2305UTC and received "NA" very clearly. Then you sent "RDI" which had some frequency wobble. This was followed by a
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-09/msg00163.html (11,302 bytes)

82. Re: Re[2]: LF: First LF TX's from 2E0ILY (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Sun, 18 Oct 2015 12:13:12 +0100
Chris, I have been following your exploits with getting going on LF tramsmit. You certainly have a very good signal for the relatively low RF input so there is actually not a lot wrong with what you
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-10/msg00243.html (14,890 bytes)

83. LF: Good 136kHz conditions (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Sun, 18 Oct 2015 12:53:34 +0100
Good conditions and activity last night on the 136kHz band. My Op32 transmission at midnight UTC last night produced reports from nine countries, including LA, SM, EW6, SV, SP and EA. I also received
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-10/msg00244.html (8,592 bytes)

84. Re: Re[4]: LF: First LF TX's from 2E0ILY (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Sun, 18 Oct 2015 20:48:35 +0100
Well, that makes sense if (as I suspect) your impedance is a few tens of ohms, ie you barely need a transformer (at least for matching purposes). de Mike ==
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-10/msg00260.html (9,946 bytes)

85. Re: LF: Administrative prohibition (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Mon, 19 Oct 2015 11:57:45 +0100
Sheep defeats wolf! G3XDV ==
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-10/msg00282.html (11,181 bytes)

86. Re: Re[2]: LF: Where to measure antenna current? (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Tue, 20 Oct 2015 11:15:13 +0100
Your scope match measures the current in the feeder. This is not the same as that in the antenna which may be a different impedance - which is why you need a matching circuit (eg transformer). You c
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-10/msg00318.html (10,266 bytes)

87. Re: LF: Re: RE: [rsgb_lf_group] QRSS questions (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Sun, 25 Oct 2015 14:03:29 +0100
The transatlantic frequency for Eu stations is 136.172kHz plus or minus a couple of Hertz. As you say, Eu stations listen around 137.777kHz for intercontinental DX. Mike, G3XDV ==
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-10/msg00415.html (13,338 bytes)

88. LF: VO1NA last night (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Thu, 29 Oct 2015 12:59:44 +0100
Another solid 136kHz band transmission from VO1NA, mostly strong with some fading. A long CQ call lasting from when I started watching at 0205 until he faded just after sending "QSX" at 0740UTC. The
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-10/msg00441.html (8,785 bytes)

89. Re: LF: Zmag of 45.6 Ohms OK, or should I try for better? (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Fri, 30 Oct 2015 21:43:20 +0100
I agree with Stefan. A transformer (using a suitable core material such as 3C90) gives you more flexibility in the future It also provides the opportunity to isolate the RF ground from the mains supp
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-10/msg00483.html (10,911 bytes)

90. Re: Re[2]: LF: Zmag of 45.6 Ohms OK, or should I try for better? (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Mon, 02 Nov 2015 14:05:48 +0100
Chris, my 3C90 transformer has about 16 turns on each winding. (I say approximately as I need to adjust by a turn or two between summer and winter due to absorption/detuning by trees. I would suggest
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00035.html (12,949 bytes)

91. Re: Re[2]: LF: Zmag of 45.6 Ohms OK, or should I try for better? (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Mon, 02 Nov 2015 16:21:42 +0100
Well, I specified the core type as Chris was originally using a different type, but of course the size is relevant. The diameter is 55mm and I use two cores, one on top of the other, to reduce heat.
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00044.html (15,293 bytes)

92. Re: Re[2]: LF: Zmag of 45.6 Ohms OK, or should I try for better? (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Mon, 02 Nov 2015 17:03:49 +0100
55mm is the OD. Did you need the ID? Mike ==
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00047.html (10,902 bytes)

93. Re: Re[2]: LF: Zmag of 45.6 Ohms OK, or should I try for better? (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Mon, 02 Nov 2015 17:31:09 +0100
The ID is 40mm. It is similar to the one at: http://uk.farnell.com/ferroxcube/tx58-41-18-3c90/ferrite-core-toroid3c90/dp/1784191 Mike ==
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00049.html (12,006 bytes)

94. Re: LF: Capacitive top hat question (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Sat, 07 Nov 2015 12:03:04 +0100
To all intents and purposes a short (in wavelengths) vertical attached to an arrangement of horizontal wires is a simple (capacitively) loaded vertical. The horizontal part will radiate, especially i
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00115.html (17,437 bytes)

95. LF: 136kHz activity last night (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Sun, 08 Nov 2015 11:40:07 +0100
Opera 32 activity was high and widespread last night. My transmissions were reported by: DF2JP, DB1EPO, PA7EY, TF3HZ, SP5XSB, SV8RV, EW6BN, G3XKR, EA5DOM, DF6NM*, DK7FC*. IS7SLZ*, YO/4X1RF*. (* = OPD
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00153.html (8,340 bytes)

96. LF: VO1NA - interesting condx (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Tue, 10 Nov 2015 15:14:15 +0100
Very interesting reception of VO1NA last night on 137kHz Opera32. Firstly, for a long period those stations in the west of the UK (GW0EZY, G3XKR, G4WGT, G8HUH) seemed to have much better reception th
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00201.html (12,722 bytes)

97. LF: LF receiver (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Wed, 11 Nov 2015 14:34:34 +0100
Chris, What receiver are you using? By how much does the background noise go down when you disconnect the antenna (ideally replacing the antenna with a 50-ohm resistor)? Do you have any local QRM? Ar
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00219.html (9,273 bytes)

98. Re: Re[2]: LF: LF receiver (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Wed, 11 Nov 2015 15:55:36 +0100
Chris, You should not need to use the 's' meter on HDSDR when taking relative readings. The (wideband) waterfall display is already in decibels - just place the cursor at the position you want to mea
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00223.html (10,463 bytes)

99. Re: Re[4]: LF: LF receiver (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Wed, 11 Nov 2015 17:37:44 +0100
Hmmm. Interesting. You don't show DCF39 (I wrongly called it DCF38 before) as it is outside your passband. However you show HGA on 135.42 at 40dB above noise. I see it at 59dB above noise and that co
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00225.html (11,840 bytes)

100. LF: Off air for a few days (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Tue, 17 Nov 2015 14:56:41 +0100
My antenna came down in the recent gale (the wires,not the poles so no harm done). It will take a few days to restore it. I may be able to run a temporary receive antenna in the meantime. Mike, G3XDV
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00367.html (7,762 bytes)


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