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81. LF: Re: Re: Re: Re: Off Topic---QRM (score: 1)

Author: "Dave Brown" <tractorb@ihug.co.nz>

Date: Thu, 10 Jun 2004 21:06:25 +1200

Basic rate ISDN lines usually have a locally powered (ac mains wall wart etc) NT at the customer premises-if the power goes off this will stop 'talking' to the exchange end-which it is normally doing

/rsgb_lf_group-archives/html/rsgb_lf_group/2004-06/msg00060.html (12,206 bytes)

82. LF: Re: Web site (score: 1)

Author: "Dave Brown" <tractorb@ihug.co.nz>

Date: Tue, 6 Jul 2004 16:59:03 +1200

Italian site faster in ZL Dave ZL3FJ Could you please all of you do me a favour ? As you may know, my Web site http://www.weaksignals.com is physically hosted by qsl.net, which more often than not is

/rsgb_lf_group-archives/html/rsgb_lf_group/2004-07/msg00022.html (9,789 bytes)

83. LF: Re: Re: Tin Plating compound (off topic LF, almost on topic microwaves) (score: 1)

Author: "Dave Brown" <tractorb@ihug.co.nz>

Date: Sat, 10 Jul 2004 10:26:47 +1200

A timely reminder, thanks Peter-- I have a quantity here still - way up on a back shelf inside several thick plastic bags. I need to safely dispose of it.......maybe I should keep just a small amount

/rsgb_lf_group-archives/html/rsgb_lf_group/2004-07/msg00050.html (9,458 bytes)

84. LF: RX320 receiver (score: 1)

Author: "Dave Brown" <tractorb@ihug.co.nz>

Date: Wed, 8 Sep 2004 22:43:36 +1200

Is anyone using the Ten Tec RX320 regularly for LF work?? (either with a converter or with the AMRAD mod to the 320 itself) Interested to hear any feedback, good, bad, or indifferent. 73 Dave, ZL3FJ

/rsgb_lf_group-archives/html/rsgb_lf_group/2004-09/msg00034.html (7,725 bytes)

85. LF: Re: Loading Coils (score: 1)

Author: "Dave Brown" <tractorb@ihug.co.nz>

Date: Wed, 17 Nov 2004 23:30:50 +1300

Chris Most of your losses will normally be in your ground system - not the loading coil. Amateur LF vertical antenna systems of necessity have severely constrained (size/efficiency) ground systems. S

/rsgb_lf_group-archives/html/rsgb_lf_group/2004-11/msg00123.html (12,017 bytes)

86. LF: Re: Off Topic, ZL rhombic (score: 1)

Author: "Dave Brown" <tractorb@ihug.co.nz>

Date: Mon, 29 Nov 2004 23:51:40 +1300

Possibly the late ZL2BT-QTH was on the east coast of the north island, and he did have rhombics (plural!) 73 Dave, ZL3FJ In the early 60s I had several QSOs with a ZL station who used to put out a co

/rsgb_lf_group-archives/html/rsgb_lf_group/2004-11/msg00267.html (9,952 bytes)

87. LF: Re: Re: Off Topic, ZL rhombic (score: 1)

Author: "Dave Brown" <tractorb@ihug.co.nz>

Date: Tue, 30 Nov 2004 18:02:05 +1300

That's right,Ed. But Peter didn't get his antenna farm until about the early 1970s when he shifted out of town (he used to live about 2 km away from me) - ZL2BT was running big rhombics quite some ye

/rsgb_lf_group-archives/html/rsgb_lf_group/2004-11/msg00283.html (10,936 bytes)

88. Re: LF: Re: SWR-off topic (score: 1)

Author: "Dave Brown" <tractorb@ihug.co.nz>

Date: Tue, 18 Jan 2005 10:19:25 +1300

The SWR measuring trolley was a standard piece of kit at multi-tx HF transmitter sites with multiple openwire antennas and feeders. Keep in mind the real estate involved was large, very large, and wh

/rsgb_lf_group-archives/html/rsgb_lf_group/2005-01/msg00411.html (11,282 bytes)

89. LF: Re: Untuned loops (score: 1)

Author: "Dave Brown" <tractorb@ihug.co.nz>

Date: Tue, 15 Mar 2005 23:23:57 +1300

Loop induced emf(volts) = 2*pi*(field strength in v/m)*(loop area in sq. metres)* (loop turns)/wavelength. Which for the single turn untuned circular loop case, can be simplified to; Loop induced emf

/rsgb_lf_group-archives/html/rsgb_lf_group/2005-03/msg00264.html (10,491 bytes)

90. LF: Heads up- linux users (score: 1)

Author: "Dave Brown" <tractorb@ihug.co.nz>

Date: Tue, 24 May 2005 21:10:34 +1200

In case there's any interest in an 'Argo-like' package-check this out. http://www.baudline.com/ Usual disclaimers apply. 73 Dave, ZL3FJ

/rsgb_lf_group-archives/html/rsgb_lf_group/2005-05/msg00144.html (9,684 bytes)

91. LF: Re: off topics: Inverter 12V/-12V wanted from DK 8 ND (score: 1)

Author: "Dave Brown" <tractorb@ihug.co.nz>

Date: Fri, 27 May 2005 09:15:59 +1200

There used to be a low frequency arrangement using a 555 timer as a DC-DC converter for charging NICds from a 12 volt supply-was common in the amateur literature maybe 20 years ago. Might be the sort

/rsgb_lf_group-archives/html/rsgb_lf_group/2005-05/msg00178.html (11,391 bytes)

92. LF: Re: Low power Tx (score: 1)

Author: "Dave Brown" <tractorb@ihug.co.nz>

Date: Mon, 20 Mar 2006 08:36:16 +1200

Any chance of seeing a cct of this, Walter? Info re xfmrs used would be particularly interesting-just to see how they compare to 'local' designs. 73 Dave, ZL3FJ (who has several tube/valve LF txs!) I

/rsgb_lf_group-archives/html/rsgb_lf_group/2006-03/msg00334.html (9,681 bytes)

93. LF: Re: ClickLock (score: 1)

Author: "Dave Brown" <tractorb@ihug.co.nz>

Date: Tue, 25 Apr 2006 21:50:46 +1200

From G3PLX: Dave asks how close do you have to be to see anything that isn't exactly on frequency. The answer is 'it depends'. snip -- That sums it up very well Peter, thanks for the reply. 73 Dave,

/rsgb_lf_group-archives/html/rsgb_lf_group/2006-04/msg00107.html (11,040 bytes)

94. Re: LF: Re: PhaseScope beta 1.0 release... (score: 1)

Author: "Dave Brown" <tractorb@ihug.co.nz>

Date: Mon, 24 Apr 2006 15:38:34 +1200

OK agn, Scott/Murray I had another look at the phasescope pdf file and with an integration time of 300 or so seconds its obvious the effective b/w is waaay down. I guess I was just interested to see

/rsgb_lf_group-archives/html/rsgb_lf_group/2006-04/msg00174.html (13,048 bytes)

95. Re: LF: Re: PhaseScope beta 1.0 release... (score: 1)

Author: "Dave Brown" <tractorb@ihug.co.nz>

Date: Mon, 24 Apr 2006 12:44:28 +1200

Scott, Murray Fine. Tks for replies. I'm not concerned about the RX stability contribution-that's under control (or should be!) But for non-GPS disciplined TXs I wondered just how good they would hav

/rsgb_lf_group-archives/html/rsgb_lf_group/2006-04/msg00176.html (14,147 bytes)

96. LF: Re: PhaseScope beta 1.0 release... (score: 1)

Author: "Dave Brown" <tractorb@ihug.co.nz>

Date: Mon, 24 Apr 2006 12:03:18 +1200

Hi Scott Wondering just how close to nominal does the tx have to be maintained to stay 'in view' so to speak? 73 Dave, ZL3FJ -- Original Message -- From: "Scott Tilley" <sthed475@telus.net> To: "LWCA

/rsgb_lf_group-archives/html/rsgb_lf_group/2006-04/msg00179.html (11,883 bytes)

97. Re: LF: 18.5 kHz in CT (score: 1)

Author: "Dave Brown" <tractorb@ihug.co.nz>

Date: Sun, 23 Apr 2006 09:09:25 +1200

Is VTX3 (India) still running on 18.2-used to be a solid signal here in ZL but not listened down there in a while. ZL3FJ (no 'LF' or 'VLF' ears at present) Markus Only receiving 18.1 here at the mome

/rsgb_lf_group-archives/html/rsgb_lf_group/2006-04/msg00280.html (12,025 bytes)

98. LF: Re: miniwhip testing - was T/A May 14 (score: 1)

Author: "Dave Brown" <tractorb@ihug.co.nz>

Date: Tue, 16 May 2006 09:20:51 +1200

Hi Roelof The results of testing with the battery operated SPM-3 may give a clearer picture of what is happening. Your test data appears to show the metallic pole is reducing the effective height of

/rsgb_lf_group-archives/html/rsgb_lf_group/2006-05/msg00022.html (10,693 bytes)

99. LF: Re: Re: T/A May 14 (score: 1)

Author: "Dave Brown" <tractorb@ihug.co.nz>

Date: Mon, 15 May 2006 22:16:14 +1200

Disregard the comment about signal strength variation with height, Roelof - I must have had a bad night last night! Of course it will vary with height, regardless of feedline issues - silly me! Inter

/rsgb_lf_group-archives/html/rsgb_lf_group/2006-05/msg00045.html (11,657 bytes)

100. LF: Re: T/A May 14 (score: 1)

Author: "Dave Brown" <tractorb@ihug.co.nz>

Date: Mon, 15 May 2006 09:01:20 +1200

Hi Roelof Can you be quite sure the feedline is not contributing to your received signal level? Any variation in strength with height would be a good indication that it is. Interesting to note your p

/rsgb_lf_group-archives/html/rsgb_lf_group/2006-05/msg00105.html (11,257 bytes)