60m PSK31 ??? PSK31 is USB Right?
60m PSK31 ??? PSK31 is USB Right?
My question might be silly, but after reviewing the ARRL 60m FAQ, I'm not sure WHY PSK31 on 60m is not legal, after all PSK31 is USB, and 60m is all USB/SSB.
Sorry Voice only
I'm sure amateurs are restricted to voice comms on that allocation. Otherwise I would get on 60M CW ! ! !
Originally Posted by KI4SGU
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This post sounds very much like an issue that us Slow Scan operators have been wondering about for quite a while. I believe you will find the answer, if not directly, certainly in essence in Steve Ford's reply to a string that was on the ZED a few weeks ago. This is in regards to using narrow SSTV on 10 Mhz. Steve's answer is below as the major part of this post, which follows:
After Steve Ford WB8IMY wrote his article that appeared in the June 2008 issue of
QST magazine, I sent him an E-Mail, asking if he would clarify what he stated in that article, IE: that "recent changes" had been made which allowed narrow SSTV modes to be used on the 10 Mhz band. Here is a direct copy of the correspondence that led to his very excellent response to my query:
From: Jim Stanicek [mailto:email@example.com]
Sent: Mon 6/2/2008 7:31 PM
To: Ford, Steve, WB8IMY
Subject: Narrow bandwidth SSTV is "data" ? ? ?
In the "Electic Technology" article on page 98 of the June 2008 issue, you say, "Recent FCC actions have made it possible to legally exchange images in the data portions of the HF bands ... "
What you don't recite is the "Chapter and Verse" of the "actions" that the FCC has taken that affect longstanding legislation prohibiting such transmissions.
There have been numbers of us who have delved into the possibility of using a narrow mode of SSTV in the "cw/data" portions of the bands for a number of years, now. Witness the picture sending mode that was popular using a modified form of MFSK with MixW a few years ago. These experimental attempts never achieved greater popularity or widespread usage, because we have always been reminded of Part 97.305 of the FCC's rules and regulations that define a "Picture" as a "Picture" and "Data" as "Data", no matter WHAT the mode of modulation that was used. That current interpretation IS what allows the use of DRM to send pictures in the "voice/picture" portions of the bands, including very popular gathering spots, 14.233Mhz and 7.173Mhz. DRM may be a "digital" modulation protocol, but the CONTENT of the transmission is to be decoded as a PICTURE!
As far as I can tell, the FCC has NOT announced any changes to part 97.305, or elsewhere that changes the rules and regulations that have been in place for a good number of years, or their interpretation now!
I'm sorry to say this, but if the FCC came knocking on my door and arresting me for sending pictures on a frequency that was only authorized for narrow mode CW/DATA, I would not consider it an adequate argument to say, "But I read in QST Magazine, that it was OK to do it ! ". And that would be the ONLY argument I would have!
Would you or someone PLEASE tell us EXACTLY WHERE this alleged change to the rules and regulations or their interpretation is to be found? Many of us have been hoping and searching for this change for YEARS !
Sincerely, James Stanicek AG3Y
Steve Ford replied:
My apologies. "Recent" was actually 19 months ago. It is contained in the FCC Report and Order issued in November 2006. The R&O did, among other things, amend 97.305(c) to broaden permission for image transmission.
In the R&O, these relevant paragraphs appear:
16. In the NPRM, the Commission sought comment77 on whether it should revise the definition of data emission types contained in Section 97.3(c) of our Rules to include emission types A1C and F2C.78 This would permit amateur stations to transmit FAX emissions having an occupied bandwidth of 500 Hz or less on the frequency segments used for data communications.79 The NPRM also noted that limiting the occupied bandwidth of image emissions in data segments of the HF bands to 500 Hz or less would provide the amateur service community greater flexibility in developing communication systems and communications technology, thereby furthering that purpose of the amateur service while maintaining the narrow bandwidth nature of the data emission band segments.80
17. Decision. All commenters who addressed this issue support the NPRM proposal to revise the definition of data in the amateur service rules. We agree that permitting images to be transmitted on data emission frequency segments will “allow amateur radio to make the most of new [software] programs”81 thereby “advanc[ing] its technology.”82
73 . . . Steve, WB8IMY
The main point is that only VOICE transmissions are allowed on 60 meters, using USB. Sending DATA on that band would be a real NO NO !
Ham Radio, Amateur Astronomy, and Model Airplanes - what better way to spend some time!
No time is ever wasted that is spent LEARNING something !
My guess without having looked it up is PSK31 is a DIGITAL mode transmitted in USB. Digital and USB are not the same thing.
Originally Posted by KI4SGU
But, not working 60 meters, I can't say for sure it isn't legal to use . . . .
Off to the books . . .
60m only allows PHONE emissions using USB, not any other emissions.
That said, I wonder if you can transmit digital voice on 60m?
The answer to your question "why is it not legal" is because the authorities have decided that it is not permitted, and that's it. Just like its not legal to drive a car on the sidewalk. Why, because its not permitted.
Please don't get me wrong, I'm not trying to change anything, I'm looking for a chapter and verse answer as to why it is generaly believed that it is not legal. I too believe that it not, but I'm not sure why I believe it. And my other point is that psk31 could share one of those 60m channels and fill it with a dozen or more channels. And it would also generate more interest in 60m.
The rules specifically state that only the permissible mode on our 60m channels is emission type 2K8J3E, upper side band voice transmission, 2.8 kHz bandwidth. See CFR 47 Part 2, 2.106, Table of Frequency Allocations and Note US 381. Also, CFR 47 Part 97, 97.303(s).
PSK31 is emission type 60H0J2B, and therefore not allowed on 60m.
Last edited by KR2D; 07-09-2008 at 10:44 PM.
Reason: fixed emission type
73, Ron KR2D
By the way, PSK31 works perfectly well with your transceiver set to LSB, you don't even need to tell your software to use inverted tones. Other soundcard modes will also work on the "wrong" sideband if you use inverted tones.
Those data modes are not really USB or LSB. Do some research on modulation techniques to learn why. There's some good introductory material on wikipedia - but you better like mathematics!
73, Ron KR2D
From 97.303 :
(s) An amateur station having an operator
holding a General, Advanced or
Amateur Extra Class license may only
transmit single sideband, suppressed
carrier, (emission type 2K8J3E) upper
sideband on the channels 5332 kHz, 5348
kHz, 5368 kHz, 5373 kHz, and 5405 kHz.
Amateur operators shall ensure that
their transmission occupies only the
2.8 kHz centered around each of these
frequencies. Transmissions shall not
exceed an effective radiated power
(e.r.p) of 50 W PEP. For the purpose of
computing e.r.p. the transmitter PEP
will be multiplied with the antenna
gain relative to a dipole or the equivalent
calculation in decibels. A half
wave dipole antenna will be presumed
to have a gain of 0 dBd. Licensees using
other antennas must maintain in their
station records either manufacturer
data on the antenna gain or calculations
of the antenna gain. No amateur
station shall cause harmful interference
to stations authorized in the
mobile and fixed services; nor is any
amateur station protected from interference
due to the operation of any
Have you read part 97, if not you should. Also do you know that it is required of you to keep a copy in your shack?
Last edited by N2VWW; 07-09-2008 at 11:37 PM.