[Lowfer] Looking for 73 kHz band modes to try...

[Bob Raide]

John;
That may be but I am operating under an experimental part 5 license-it is part of our experimental purposes.  However, it would appear that the Commission, at this point, doesn't care as they no doubt have bigger fish to fry.   Our part 5 licenses so issued to Warren Zeigler allow it's use and in fact is the main reason we are authorized our licenses.  
As to authorizing use by amateurs, these freqs may or may not get to amateur status.  There is resistance from the power grid people and it certainly has held things up with all the smoke they have been blowing-Bob
 
> From: listread at lwca.org
> To: lowfer at mailman.qth.net
> Date: Thu, 5 Dec 2013 19:06:23 -0600
> Subject: Re: [Lowfer] Looking for 73 kHz band modes to try...
> 
> >>> Opera is not legal to tx in the US, FCC thinks it is a spread-spectrum 
> >>> mode.
> 
> Actually, Cliff, that's what its own, er, inventor called it, way back when. 
> Perhaps they took his word for it.  It's not really SS, of course.  It uses 
> no energy-spreading techniques; it's merely frequency agile.
> 
> But it's still not legal below 50 MHz in the US amateur service for a much 
> more fundamental reason...the same reason WSPR and PSK31 and others *do not* 
> meet the published Part 97 requirements on HF, either!
> 
> In 160m and all relevant segments of the HF bands through 12 meters where 
> RTTY and data are permitted by Sec. 97.305, Note 3 of 97.307(f) also 
> applies:  "Only a RTTY or data emission using a specified digital code 
> listed in §97.309(a) of this part may be transmitted. The symbol rate must 
> not exceed 300 bauds, or for frequency-shift keying, the frequency shift 
> between mark and space must not exceed 1 kHz."  (At 10m, it's Note 4 
> instead, which is exactly the same except for a 1200 baud symbol rate.)
> 
> Well, obviously the baud limits and the maximum frequency shift are not the 
> problem.  But if you follow on to 97.309(a), you find that there are only 
> three coding methods specified for RTTY and data emissions...5-level Baudot, 
> AMTOR, and ASCII.  That's all!
> 
> Unspecified codes _are_ permitted by Notes 5 and 6, but those notes apply 
> only within bands above 50 MHz.  Thus, OPERA and the other aforementioned 
> modes are legal up there, with a few restrictions.  And, Part 5 licensees 
> are not under the requirements of 97.309(a) at all, so there's presently no 
> problem using any of these modes in the US at LF and VLF.
> 
> (QRSS employs International Morse, the coding method explicitly defined for 
> CW in 97.3(c)(1) and permitted virtually everywhere in the ham bands by 
> 97.307(a).  Hellschreiber is an image mode, on which few specs are stated in 
> the Rules other than bandwidth limits, so no problem there either.)
> 
> But assuming we do someday get 2200 and/or 630 meters in the amateur 
> service, one of two things will need to happen before it's legitimate to use 
> popular digital modes in those bands:  (1) there will need to be yet another 
> new slow mode that does, in fact, utilize one of the currently specified 
> codes; or else, (2) developers of this sort of software will need to get 
> together and agree on a nice, efficient varicode they can all get behind, 
> publish it, and then petition the FCC to include it in the specified codes 
> of 97.309(a).  I have no doubt most of us here would gladly support such a 
> petition.  Then some variant of each of these worthwhile digimodes would be 
> legitimate for American ham use in all bands.
> 
> 73
> John 
> 
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