[Namaste-dev] Part 97 Restrictions for 2m, 70cm, 9cm, 5cm

Michelle w5nyv at yahoo.com
Thu May 8 17:44:17 PDT 2008


For Frank, et al
OK, first I considered 2m.
I got the band plan. 
from http://en.wikipedia.org/wiki/2_meters
USA band plan
144.300 - 144.500 MHz Satellite
145.510 - 145.790 MHz FM simplex, digital, and Satellite. Channels are spaced 20kHz apart (145.510, 145.530, 145.550).
145.800 - 146.00 MHz Satellite
And then I looked up the emission types.
Authorized emission types on 2m (144.1-148.0) MHz MCW, phone, image, RTTY, data, test. 
Standards as as follows:
1. "No non-phone emission shall exceed the bandwidth of a communications quality phone emission of the same modulation type. The total bandwidth of an independent sideband emission (having B as the first symbol), or a multiplexed image and phone emission, shall not exceed that of a communications quality A3E emission."
2. "A RTTY, data or multiplexed emission using a specified digital code listed in §97.309(a) of this Part may be transmitted. The symbol rate must not exceed 19.6 kilobauds. A RTTY, data or multiplexed emission using an unspecified digital code under the limitations listed in §97.309(b) of this Part also may be transmitted. The authorized bandwidth is 20 kHz."
3. "A RTTY or data emission having designators with A, B, C, D, E, F, G, H, J or R as the first symbol; 1, 2, 7 or 9 as the second symbol; and D or W as the third symbol is also authorized."
Ok so what does that mean?
The list of emission types can be found at this helpful page:
 http://en.wikipedia.org/wiki/Types_of_radio_emissions
The emission types are a combination of letters and numbers. These letters and numbers were referred to above in #3 in the Standards section. So, you can play around with the different emission types and see what works.
I think that the 20 kHz is what applies here, because of the "using an unspecified digital code". The specified digital codes include Baudot, AMTOR, or ASCII, CLOVER, G-TOR, or PacTor and other published codes. 
Did I interpret that correctly?
Next I considered 70cm.
http://en.wikipedia.org/wiki/70_cm
In the US and Australia the band ranges from 420 to 450 MHz with some geographical limitations; in Canada, the band is only 430 - 450 MHz; in the UK, amateurs are allocated 430 - 440 MHz.
ARRL US band plan
435.00 - 438.00 MHz Satellite only (internationally) 
Authorized emission types on 70 cm (entire band) include MCW, phone, image, RTTY, data, SS, test. 
Standards are as follows:
1. A RTTY, data or multiplexed emission using a specified digital code listed in §97.309(a) of this Part may be transmitted. The symbol rate must not exceed 56 kilobauds. A RTTY, data or multiplexed emission using an unspecified digital code under the limitations listed in §97.309(b) of this Part also may be transmitted. The authorized bandwidth is 100 kHz. 
2. A RTTY or data emission having designators with A, B, C, D, E, F, G, H, J or R as the first symbol; 1, 2, 7 or 9 as the second symbol; and D or W as the third symbol is also authorized. 
Using the same reasoning as for 2m, it sounds like the digital mode bandwidth for 70cm would be 100kHz, since we are not using one of the specified digital codes.
While we're at it, here is the information for the authorized emission types for 3.4 GHz and 5.6 GHz.
9 cm (entire band) MCW, phone, image, RTTY, data, SS, test, pulse 
5 cm (entire band) MCW, phone, image, RTTY, data, SS, test, pulse 
Standards for both bands are identical and are as follows:
1. Emission F8E (Normal FM stereo broadcast) may be transmitted.
2. A RTTY, data or multiplexed emission using a specified digital code listed in §97.309(a) of this Part or an unspecified digital code under the limitations listed in §97.309(b) of this Part may be transmitted. 
3. A RTTY or data emission having designators with A, B, C, D, E, F, G, H, J or R as the first symbol; 1, 2, 7 or 9 as the second symbol; and D or W as the third symbol is also authorized. 
FSK (designated as emission type F1B or F1D) is allowed.
SS stands for Spread-spectrum emissions using bandwidth-expansion modulation emissions having designators with A, C, D, F, G, H, J or R as the first symbol; X as the second symbol; X as the third symbol.
Meaning frequency modulation, none of the above, none of the above.
I'll take another stab at this tomorrow with attention towards finding anything satellite service specific. All of this was from part 97. 
Please comment and critique!
More soon,
-Michelle W5NYV
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