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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*LF\:\s+Selection\s+of\s+spot\s+frequencies\s+for\s+DX\s*$/: 8 ]

Total 8 documents matching your query.

1. Re: LF: Selection of spot frequencies for DX (score: 1)
Author: "Vernall" <[email protected]>
Date: Thu, 27 Mar 2003 07:06:55 +1200
Jim and others, Thanks for getting the numbers straightened out. I've been hasty with email recently due to "not enough minutes in the day". The mains harmonic situation is that "very high" frequency
/rsgb_lf_group-archives/html/rsgb_lf_group/2003-03/msg00084.html (10,923 bytes)

2. Re: LF: Selection of spot frequencies for DX (score: 1)
Author: "James Moritz" <[email protected]>
Date: Wed, 26 Mar 2003 11:25:59 +0000
I made a numerical mistake in my last posting. 25 Hz shift at 136 kHz is a ratio of about 0.009, or 0.9%. Of course, we would like the "QRM deviation" of 50 Hz lines to be much less than plus or minu
/rsgb_lf_group-archives/html/rsgb_lf_group/2003-03/msg00097.html (10,624 bytes)

3. Re: LF: Selection of spot frequencies for DX (score: 1)
Author: "Vernall" <[email protected]>
Date: Wed, 26 Mar 2003 07:29:53 +1200
Hi all, I made a numerical mistake in my last posting. 25 Hz shift at 136 kHz is a ratio of about 0.009, or 0.9%. Of course, we would like the "QRM deviation" of 50 Hz lines to be much less than plus
/rsgb_lf_group-archives/html/rsgb_lf_group/2003-03/msg00108.html (10,278 bytes)

4. Re: LF: Selection of spot frequencies for DX (score: 1)
Author: "Vernall" <[email protected]>
Date: Tue, 25 Mar 2003 08:56:37 +1200
Hi Jim, Alberto, Rik and others, I agree that the frequency stability of the mains network is a point to consider further. However, I think there are two interference mechanisms at play in the LF ban
/rsgb_lf_group-archives/html/rsgb_lf_group/2003-03/msg00136.html (15,027 bytes)

5. Re: LF: Selection of spot frequencies for DX (score: 1)
Author: "Rik Strobbe" <[email protected]>
Date: Mon, 24 Mar 2003 17:17:30 +0100
The picture seems to confirm Jim's remark, a variation of 1-2Hz at the 53rd harmonic results is a variation of 50-100Hz at the 2740th harmonic (137kHz) 73, Rik ON7YD At 15:43 24/03/2003 +0100, you wr
/rsgb_lf_group-archives/html/rsgb_lf_group/2003-03/msg00139.html (11,714 bytes)

6. Re: LF: Selection of spot frequencies for DX (score: 1)
Author: "Alberto di Bene" <[email protected]>
Date: Mon, 24 Mar 2003 15:43:06 +0100
James Moritz wrote: Not sure about ZL, but here in the UK the 50Hz nominal mains frequency drifts around quite a bit - perhaps a few tenths of 1%. Seen on a fairly coarse resolution spectrogram, the
/rsgb_lf_group-archives/html/rsgb_lf_group/2003-03/msg00141.html (11,250 bytes)

7. Re: LF: Selection of spot frequencies for DX (score: 1)
Author: "James Moritz" <[email protected]>
Date: Mon, 24 Mar 2003 13:42:21 +0000
Dear LF Group, At 17:09 22/03/2003 +1200, Bob wrote: So my suggestion for selecting frequencies for long haul DX between amateur stations is to avoid multiples of 50 or 60 Hz (50 Hz mains being used
/rsgb_lf_group-archives/html/rsgb_lf_group/2003-03/msg00144.html (11,817 bytes)

8. LF: Selection of spot frequencies for DX (score: 1)
Author: "Vernall" <[email protected]>
Date: Sat, 22 Mar 2003 17:09:32 +1200
Hi all, I originally thought that 137.7000 kHz was clear of QRM in this corner of the world, however lots of capture time on trying to find a UA9OC signal (with success on 13 March) found a weak QRM
/rsgb_lf_group-archives/html/rsgb_lf_group/2003-03/msg00161.html (10,900 bytes)


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