22 Meter ISM band

[DJboutit3]

22 Meter ISM Band 13.553-13.567 MHz part 15 should be good for broadcasting decent ammount of power can be used here. Anybody have any more info on this band?

 

[DJboutit3]

HF Part 15 stations occupy a narrow slice of the 22 meter shortwave band in accordance with the provisions of 15.225, which specifies a field strength limit of 10,000 uV (10 mV) per meter at 30 meters from the antenna. In practice this works out to 1.8 mW transmitter output power into a 1/2 wave dipole, or 3 mW into an isotropic (0 dBi) radiator. While this power level may sound minuscule remember that by comparison, only a fraction (< 1%) of the power a 100 mW Part 15.219 AM transmitter feeds to its antenna is actually radiated by even the most 'efficient' 3 meter antenna; in fact, the amount radiated is roughly comparable what is permitted in this HF band

 

[DJboutit3]

Lowfer is good for part 15 to

Longwave Part 15 stations operate under the provisions of 15.217 which permits 1 watt final input power, and an antenna, feedline and ground lead combined length (not height) of 15 meters (~49.2 feet) maximum. All LF systems known to the author use an antenna, which may be any of various types but usually are the typical vertical monopole, either a mast/tower or a "flattop" (wire "T" as used by aviation LF beacons) and with radials and/or a ground screen. The 160-190 kHz band is often referred to as "the 1750 Meter Band

 

[radiotower40]

Are there any part 15'S currently on this band? Is their any regular broadcasters on the band, and if so what type of programming
is it? Also, what type of radio do you have to have to pick it up?

 

[rfry]

HF Part 15 stations occupy a narrow slice of the 22 meter shortwave band in accordance with the provisions of 15.225, which specifies a field strength limit of 10,000 uV (10 mV) per meter at 30 meters from the antenna. In practice this works out to 1.8 mW transmitter output power into a 1/2 wave dipole, etc

Some unfortunate realities here are that propagation loss over the surface of the earth is very high using of a wavelength of 22 meters. Groundwave coverage of compliant 22-meter Part 15 systems would be worse than Part 15 systems using 540-1700 kHz, under 15.219.

And even if the skywave produced by a 1/2-wave horizontal dipole radiating 1.8 mW plus a 100 % ground reflection was 100% reflected from the ionosphere, the field strength that system could produce over a total path length of 200 km would be around 2 µV/m. Probably not "broadcast quality."

Finally, except for ham radio operators and a few others, there would no radio listeners with a suitable receiver and antenna system for 22-meter Part 15.

This post is not intended to discourage experimentation, but to show what performance such systems might produce.
//

 

[radiocph]

I think there are some "HFers" that play around in this band, but mostly using Morse Code or other digital modes.
http://www.lwca.org/

 

[4dude]

The 160-190 kHz band is often referred to as "the 1750 Meter Band

I wonder if anyone has ever pumped 100 or more watts down here to see how far they could get.. (Probably across the US ;D)

 

[dave388]

i know 100 watts ssb on 22meter would do pretty good lol.
not shure about the 100watts on the 160-190Khz band tho.

 

[LibertyNT]

i know 100 watts ssb on 22meter would do pretty good lol.
not shure about the 100watts on the 160-190Khz band tho.

on 160 KHZ i think most Longwave stations boradcast with a million watts or so.
But thats because at such a low Frequency it actually gets harder to radiate or something like that.