Talk:Radiofax: Difference between revisions

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Would a list of common/popular radiofax frequencies/stations be appropriate?

Please discuss... 66.28.178.67 17:29, 27 September 2007 (UTC)[reply]

That kind of stuff usually attracts a lot of spam, IMO. If there is a site with that kind of info we could link to, that would be a good addition for the external links. Recury 19:16, 27 September 2007 (UTC)[reply]

I believe that would enhance the article greatly--Read-write-services 01:22, 1 October 2007 (UTC)[reply]

The list I use most often is here: http://www.nws.noaa.gov/om/marine/rfax.pdf 66.28.178.68 21:37, 2 October 2007 (UTC)[reply]

Listed "frequency" for a fax transmission?

In this article: "With correct tuning (1.9kHz below the carrier frequency for USB, above for LSB), the signal shares some characteristics with SSTV, with black at 1500Hz and peak white at 2300Hz."

??? - The statement "black at 1500Hz and peak white at 2300Hz" can't possibly be true for both USB and LSB.

From http://www.nws.noaa.gov/om/marine/rfax.pdf: "Unless otherwise stated, assigned frequencies are shown, for carrier frequency subtract 1.9 kHz."

A bit confusing. What carrier? There can be a couple of meanings:

- Carrier = unshifted fax frequency, i.e. the absolute signal frequency while not carrying intelligence, which will fall 1900Hz lower, to be tuned in LSB.

- Carrier = virtual (suppressed) carrier frequency that will result in white at 2300 Hz and black at 1500 Hz, either USB or LSB.

If the suppressed carrier is at (f - 1900Hz) and the blank signal results in 1900Hz, blank will be a tone of grey. If blank means white, then the "unshifted" frequency will have to be 2300Hz above the suppressed carrier. This article says "shifted up OR down", meaning that blank is indeed grey.

Nowadays SSB generally means USB in utility radio, and "tuning" normally refers to the suppressed USB carrier, so -1900Hz refers to the tuning frequency of the radio, and most listed frequencies are absolute blank signal frequencies.

This would also mean that a fax frequency is normally listed exactly as CW was, not as SSB is, and fax would need the equivalent of a BFO offset of -1900Hz over the blank.

I am receiving GYA, 8040 kHz. With virtual carrier at at 8038.1 white seems to fall at 2300 Hz and blank at 1900.

Is this correct?

Spamhog (talk) 13:46, 23 November 2010 (UTC)[reply]

Kyodo News update

I have received these hffax's as recently as 11-Nov-2012 from the websdr in the Netherlands. 8.30.157.1 (talk) 18:00, 3 April 2013 (UTC)[reply]

Uses Beyond Weather

This article gives the impression that Radiofax is primarily a weather information technology, without any mention of the fact that it's how news photographs were rapidly shared around the world for decades. That may no longer be a current use, but it seems too important to leave out.

Revision as of 16:28, 3 May 2016 edit 71.37.40.158 (talk) →‎Uses Beyond Weather: new section ← Previous edit		Revision as of 16:28, 3 May 2016 edit undo 71.37.40.158 (talk) →‎Uses Beyond Weather Next edit →
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	== Uses Beyond Weather ==		== Uses Beyond Weather ==

	This article gives the impression that Radiofax is primarily a weather information technology, without any mention of the fact that it's how news photographs were rapidly shared around the world for decades. That may no longer be a current use, but it seems ~~pretty~~ important to leave out.		This article gives the impression that Radiofax is primarily a weather information technology, without any mention of the fact that it's how news photographs were rapidly shared around the world for decades. That may no longer be a current use, but it seems too important to leave out.