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81. LF: RE: [off band Jason] (score: 1)
Author: "Andy talbot" <[email protected]>
Date: Thu, 8 Aug 2002 08:26:14 +0100
By USB, do you mean the frequency specified is the carrier and the centre 800 Hz (or whatever) higher, or is 7000.003 the centre of the transmission ? I'm assuming for now you mean the latter, so off
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-08/msg00163.html (8,512 bytes)

82. LF: Jason Testing (score: 1)
Author: "Andy talbot" <[email protected]>
Date: Wed, 7 Aug 2002 08:27:11 +0100
I will be transmitting another Jason test transmission at low power tonight 137.500000 kHz < 500uW ERP. Start time at least by 1900z, and probably earlier. Andy G4JNT
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-08/msg00170.html (7,707 bytes)

83. LF: Jason Test (score: 1)
Author: "Andy Talbot" <[email protected]>
Date: Tue, 6 Aug 2002 20:21:16 +0100
Test transmission going out on 137.50000kHz until at least 2200z ERP < 500uW Andy G4JNT
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-08/msg00172.html (8,038 bytes)

84. LF: RE: RE: Re Jason on the DDS (score: 1)
Author: "A C Talbot" <[email protected]>
Date: Sat, 3 Aug 2002 17:16:09 +0100
That would be very helpful. Now I've added the code to programme the Jason increment into EEprom via the 'normal' DDS control, (done this morning after sending the last EMail) there are only 60 words
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-08/msg00191.html (9,185 bytes)

85. LF: RE: Re Jason on the DDS (score: 1)
Author: "A C Talbot" <[email protected]>
Date: Sat, 3 Aug 2002 10:31:04 +0100
I'll put out a JASON test transmission tonight on 137.500000, at 1900 UTC (2000 local) using the low power Tx. I may be on sporadically earlier than that, using the high power Tx to test for any EMC
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-08/msg00195.html (10,039 bytes)

86. LF: Jason on DDS Module (score: 1)
Author: "A C Talbot" <[email protected]>
Date: Fri, 2 Aug 2002 18:38:32 +0100
I seem to have successfully added a Jason mode to the AD9850/51 DDS Module. It certainly works from compur to computer anyway ! The DDS module is put into Jaso mode by grounding PB2. Then it receives
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-08/msg00198.html (8,517 bytes)

87. LF: RE: Re: "Downward modulation" (score: 1)
Author: "Andy talbot" <[email protected]>
Date: Thu, 1 Aug 2002 15:10:29 +0100
Well, I think that solves the problem. Makes sense, and Droitwich is certainly a 'very high power transmitter'. But a lot has been mentioned over the last few days about the technology of high power
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-08/msg00205.html (9,479 bytes)

88. LF: RE: Narrow CW filter using 32kHz clock crystals? (score: 1)
Author: "Andy talbot" <[email protected]>
Date: Fri, 27 Sep 2002 17:29:32 +0100
This filter is shown in the LF Experimenters Handbook on page 25, as part of the outline design for a narrow bandwidth LF receiver. The frequency response I measured is given on page 26 If you view t
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-09/msg00035.html (11,006 bytes)

89. LF: RE: Narrow CW filter using 32kHz clock crstals? (score: 1)
Author: "Andy talbot" <[email protected]>
Date: Thu, 26 Sep 2002 08:36:04 +0100
Its was I ........... 1) Take a handful of watch crystals, from the same batch (buy 10 or 20 from Farnel / Maplin ??) 2) Connect 5 in series to form the top elements of a ladder filter; you now have
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-09/msg00051.html (9,754 bytes)

90. LF: RE: Plessey Figaro (score: 1)
Author: "Andy talbot" <[email protected]>
Date: Thu, 12 Sep 2002 08:14:10 +0100
I vaguely remember a mention in RadCom of long ago. Seem to recall it operated in the 3MHz region, SSB, with a antenna woven into clothing. Andy G4JNT This was a body-worn radio system intended for f
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-09/msg00161.html (8,063 bytes)

91. Re: LF: sound cards...well amybe if..... (score: 1)
Author: "Andy talbot" <[email protected]>
Date: Wed, 30 Oct 2002 19:39:35 +0100
Yes please, I would like the PIC code. I did something similar in the past using a 16C71 PIC with 8 bit A/D. This sampled at 4kHz and formed I/Q samples at 1kHz output rate as follows for every 4 inp
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-10/msg00015.html (11,927 bytes)

92. RE: LF: sound cards...well amybe if..... (score: 1)
Author: "Andy talbot" <[email protected]>
Date: Wed, 30 Oct 2002 15:14:35 +0100
If anyone does design a USB interface for a medium to high speed A/D they could do well marketing it commercially. And then go on to look at other USB driven test equipment modules. As far as I can s
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-10/msg00019.html (10,300 bytes)

93. LF: Posting from different accounts (score: 1)
Author: "Andy talbot" <[email protected]>
Date: Wed, 30 Oct 2002 09:43:11 +0100
My works account comes through a firewall on another site, then over a more secure network to the desk, so has the advantage of being always on and having all working files to hand for sending or dow
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-10/msg00021.html (10,974 bytes)

94. LF: RE: Re: Re: Vacuum tubes on Motherboards... (score: 1)
Author: "Andy talbot" <[email protected]>
Date: Wed, 23 Oct 2002 08:35:56 +0100
Does the 4CX250 know that ? The screens in those can be blown as quickly as any transistor if you get an anode to screen arc-over. I've seen 24 '250 valves in a big ship transmitter blown in a single
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-10/msg00150.html (8,185 bytes)

95. LF: Re: Osc drift (score: 1)
Author: "Andy talbot" <[email protected]>
Date: Fri, 29 Nov 2002 20:59:30 +0100
I don't know about the IC756, but the IC746 derives all frequencies from one master oscillator at 30MHz. The high stability option for this is an ovenned crystal, and takes several minutes to get to
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-11/msg00017.html (12,691 bytes)

96. RE: LF: loop antenna (score: 1)
Author: "Andy talbot" <[email protected]>
Date: Thu, 28 Nov 2002 14:17:34 +0100
There is an awful lot of controversy over the G3LHZ theories on loops...................... Andy G4JNT Dear Dave, Rik, LF Group, At 06:36 28/11/2002 +0000, you wrote: I have just done a couple of cal
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-11/msg00038.html (9,298 bytes)

97. LF: RE: Tuesday's riddle (part 2) (score: 1)
Author: "Andy talbot" <[email protected]>
Date: Wed, 13 Nov 2002 15:33:50 +0100
I didn't get anything like that, but the negative voltage generator has a pronounced threshold as the device starts to avalanche. I wonder if you are getting an effect caused by the capacitive loadin
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-11/msg00209.html (10,161 bytes)

98. LF: FW: Re: Etiquette: Off-subject (score: 1)
Author: "Andy talbot" <[email protected]>
Date: Wed, 13 Nov 2002 10:40:52 +0100
No, where is his article ? I remember Bob Pease and many of his practical engineering tips made fascinating reading, but don't read EDN now. Is he a Ham, or just an analogue person ? This one is a wi
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-11/msg00217.html (8,112 bytes)

99. LF: Re: Etiquette: Off-subject (score: 1)
Author: "Andy talbot" <[email protected]>
Date: Tue, 12 Nov 2002 20:18:53 +0100
Has anyone complained ? The first one certainly created enough interest, even led to a few ideas for loop resonating. You need an ordinary NPN transistor (eg. 2N2222), a 9V battery, a 1k resistor and
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-11/msg00231.html (9,477 bytes)

100. LF: Re: Tuesday's riddle (score: 1)
Author: "Andy talbot" <[email protected]>
Date: Tue, 12 Nov 2002 19:37:23 +0100
Right, done it. Now that's very interesting !!!!!! Exactly as you specified, even down to the same 2N2222 device. The B-E junction breaks down at 7.56V, ie. Vbe = (minus) -7.56V With a DVM, 10M input
/rsgb_lf_group-archives/html/rsgb_lf_group/2002-11/msg00233.html (11,300 bytes)


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