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61. LF: Re: Aerial tests (score: 1)
Author: "James Moritz" <[email protected]>
Date: Fri, 2 Jun 2000 18:48:27 +0000
Dear LF Group, Some comments on G3JKV's recent E-mail - I calculated the ERP on the basis of the measured antenna current and estimated radiation resistance of the two antennas. Part of the reasoning
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-06/msg00029.html (9,788 bytes)

62. Re: LF: Bessel bandpass filter? (score: 1)
Author: "James Moritz" <[email protected]>
Date: Mon, 5 Jun 2000 13:48:45 +0000
Dear LF Group, ZL2CA wrote: But the intended thrust of this email is to ask about if anyone can find a reference to a BESSEL BANDPASS filter. Text books all say that the Bessel low pass filter has th
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-06/msg00071.html (14,787 bytes)

63. Re: LF: Formula (score: 1)
Author: "James Moritz" <[email protected]>
Date: Wed, 7 Jun 2000 12:34:49 +0000
Quote: "The intensity E (known as the field strength) of a transmission at a distance D from a source transmitting P watts of RF power via a half-wave dipole in a free, unobstructed space, can be est
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-06/msg00096.html (11,195 bytes)

64. LF: LF crystals (score: 1)
Author: "James Moritz" <[email protected]>
Date: Wed, 14 Jun 2000 12:45:33 +0000
Dear LF group, Looking through my box of crystals recently, I found some operating in the range 30 - 40kHz. They are in glass envelopes, and I noticed that the metalisation on each side of the quartz
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-06/msg00159.html (8,276 bytes)

65. LF: Antenna wire (score: 1)
Author: "James Moritz" <[email protected]>
Date: Wed, 28 Jun 2000 13:45:50 +0000
Dear LF Group, I believe most LF amateurs favour string for their antennas - preferably well soaked in brine to maximise conductivity... But seriously, I have found 24/0.2 or 32/0.2 stranded PVC insu
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-06/msg00230.html (8,343 bytes)

66. LF: VE1ZZ signals (score: 1)
Author: "James Moritz" <[email protected]>
Date: Thu, 21 Dec 2000 12:41:18 +0000
Dear LF group, Congratulations to Jack and Peter on last night's reception of VE1ZZ's signals. Funnily enough, I was using DL4YHF's excellent Spectrum Lab software to record spectrograms of 136.5kHz
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00198.html (9,298 bytes)

67. LF: Decca guard circuit info (score: 1)
Author: "James Moritz" <[email protected]>
Date: Wed, 20 Dec 2000 18:49:07 +0000
Dear LF group, Seems that quite a few people are interested in the Decca "guard" circuit The original circuit diagrams are hierarchical and take up several pages, and most of the detail is not much u
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00217.html (8,296 bytes)

68. LF: Guard circuit (score: 1)
Author: "James Moritz" <[email protected]>
Date: Tue, 19 Dec 2000 18:03:36 +0000
Dear Andy, LF group, To a reasonable approximation, the voltages in the tank circuit, and the guard circuit, will vary in direct proportion to the supply volts for a given value of load impedance. Th
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00230.html (8,855 bytes)

69. LF: Guard Circuit (score: 1)
Author: "James Moritz" <[email protected]>
Date: Mon, 18 Dec 2000 14:44:01 +0000
<?color><?param0100,0100,0100>Dear Andy, LF Group,<br><br>Aha... wondered why you hadn't mentioned it before - unfortunately, the guard circuit is not shown in the simplified diagram in the LF handbo
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00254.html (10,435 bytes)

70. LF: FETs / Overload Protection/CFH (score: 1)
Author: "James Moritz" <[email protected]>
Date: Mon, 18 Dec 2000 12:20:57 +0000
Dear Richard, Andy, LF Group, I once had a similar problem where one FET blew up in an amplifier, and it's replacement immediately failed too. This turned out to be because the other FET, although no
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00256.html (8,769 bytes)

71. LF: Loop Antennas (score: 1)
Author: "James Moritz" <[email protected]>
Date: Sat, 16 Dec 2000 16:25:44 +0000
Dear John and LF group, I was interested in G4CNN's experiments with loop antennas - in response to some of the issues he raises here is another long E- mail - please delete now if the subject bores
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00280.html (13,652 bytes)

72. LF: 73kHz / Loops (score: 1)
Author: "James Moritz" <[email protected]>
Date: Sat, 16 Dec 2000 14:45:49 +0000
Dear LF Group, Nice to see a new face on 73kHz - I was very pleased to work G3AQC for his first 2-way QSO on 73kHz. It was a bit "asymetrical", I gave Laurie a 589 report, but had to resort to QRSS t
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00284.html (8,216 bytes)

73. LF: Phase Modulator (score: 1)
Author: "James Moritz" <[email protected]>
Date: Fri, 15 Dec 2000 15:17:11 +0000
Dear Andy, LF Group, To generate linear phase shift, how about a PWM: Generate a sawtooth at carrier frequency, feed into one input of a comparator. Other comparator input is analogue "phase" signal.
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00300.html (8,327 bytes)

74. LF: 73kHz band plan (score: 1)
Author: "James Moritz" <[email protected]>
Date: Fri, 15 Dec 2000 15:03:34 +0000
Dear Laurie & Group, Not sure if a band plan exists as such, but the way it has normally been worked in the past is something like: 71.6kHz - 71.75kHz manual CW "window" (when the Rugby TX is running
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00304.html (8,531 bytes)

75. LF: CFH/73kHz Tonight (score: 1)
Author: "James Moritz" <[email protected]>
Date: Fri, 15 Dec 2000 13:01:43 +0000
Dear LF group, I have been trying the 'Eclipse' data logging software in preparation for group CFH monitoring experiments - it seems to be working fine, although I can't get all parts of the eclipse
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00307.html (9,153 bytes)

76. LF: G3AQC on 73kHz/Transatlantic (score: 1)
Author: "James Moritz" <[email protected]>
Date: Sun, 10 Dec 2000 11:49:48 +0000
Dear LF Group, Heard 589 QRSS signals from G3AQC on about 71.7kHz last night and this morning - Laurie is now one of the best signals on the band. I tried calling you on 73k, Laurie, but think you mu
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00375.html (8,495 bytes)

77. LF: CFA Antennas (score: 1)
Author: "James Moritz" <[email protected]>
Date: Sat, 9 Dec 2000 14:34:15 +0000
Dear Martin and LF Group, The CFA antenna has been doing the rounds for a while - the problem is, like most "miracle" antennas, it does not seem to live up to it's claims in real life. Nobody, includ
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00396.html (9,811 bytes)

78. LF: 73kHz Last night/This morning (score: 1)
Author: "James Moritz" <[email protected]>
Date: Sat, 9 Dec 2000 12:11:11 +0000
Dear LF Group, Thanks to DF6NM and ON4ZK for the cross-band QRSS contacts last night; also thanks to DK5PT and G3OLB for the reception reports. I did not hear any other stations on 73kHz last night.
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00397.html (8,356 bytes)

79. LF: Re:amplifiers (score: 1)
Author: "James Moritz" <[email protected]>
Date: Fri, 8 Dec 2000 18:52:52 +0000
Dear LF Group, I think this is the main function of the "transient soak" chokes in the Decca design - diverting the current into the fast diodes rather than through the Mosfet diodes during the switc
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00408.html (9,917 bytes)

80. LF: 73kHz Tonight (score: 1)
Author: "James Moritz" <[email protected]>
Date: Fri, 8 Dec 2000 11:41:21 +0000
Dear LF Group, I intend to be QRV on 73kHz this evening from about 2000utc. I will use 71.65kHz, unless other stations want to use it for manual CW. In that case, I will use my "normal" QRSS frequenc
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-12/msg00415.html (8,478 bytes)


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