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Band Plan Clarification

Apr 8th 2016, 15:55

AD5XJ

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
Here is the question on point. Can a Extra Class amateur (as an example) lawfully transmit MT-63 or OLIVIA in the voice / image segments of ham bands.

Using the ARRL current band plan it is not clear what is lawfully allowed. Since Digtal Voice is allowed and it is digital. So is SSTV and HDSSTV which are allowed. Not to mention ALE which is all over the place - all of which are digital modes.

Is it against the rules to transmit digital data (not necessarily or strictly image, or digital voice) in the voice / image segment of ham bands like 20 and 40?

Where is the restriction and what is the demarcation according to the FCC r&r.?

It is clear regular use of voice frequencies for data would be annoying and unnecessary. But in the case of an emergency (national or regional) it is not clear if that objection is valid assuming deliberate interference is not intended.

Also address bandwidth restrictions for digital modes. Are there any and where is this spelled out in the band plan chart.

de AD5XJ
Apr 12th 2016, 16:08

AD5XJ

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
What? ? ? Not even a post from the ARRL staff ? ? ? So how are we supposed to make the right decisions?
Apr 20th 2016, 15:01

WB1GCM

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
I’m sorry no one responded to your forum question.

Digital modes such as Olivia, MT-63, PSK31, JT-65, etc., are data modes and a Radio Amateur must only transmit data in the Data/RTTY segments of the Amateur bands. It is against FCC Part 97 Rules to transmit Data/RTTY modes in the Phone/Image segments of the Amateur bands.

Digital voice is a phone mode and can only be transmitted in the Phone/Image segments of the Amateur bands. It is against FCC Part 97 Rules to transmit phone modes or images in the Data/RTTY segments of the Amateur bands, even if the phone or image mode uses a digital format.

We publish a color chart that shows the Data/RTTY and Phone/Image segments of the Amateur bands:

http://www.arrl.org/files/file/Regulatory/Band%20Chart/Hambands_color.pdf

The answer to your question is not clear, looking at the chart. A think an extra footnote is needed to explain what I’ve just written.

Mind you, CW is allowed on all Amateur frequencies.

Regards,

Bob Allison
WB1GCM

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