I have a few questions about several frequency bands. Basically I'd like to know how they behave, including...
What is the typical noise floor (in mV/m, uV/m, etc, or dBu or dBm)?
How do you convert dBm to mV/m (or dBu to uV/m)? (this I think would apply to ALL frequency bands)
What's the typical rate of loss in relation to distance? (if I know my signal is a certain intensity at a certain distance, how do I figure out the intensity or distance at someplace else if I know one of those two values?) Also how would ground conductivity affect these calculations?
Basically, with the power/antenna/field levels specified, how far under normal conditions should I expect a signal to go that is one of several modes - CW, SSB AM 5kHz, mono DSB AM 10kHz, stereo AM 15kHz, narrowband FM 5kHz mono response, wideband (200kHz channel) FM, TV (6MHz)? (if you want to just specify for one mode, and tell me how to make necessary calculations to figure out for other modes, that's ok) (for bands in which something won't fit, don't include it)
If I think of anything else, I will edit (or if it won't let me, reply to) this message.
If power or field strength is not specified, what's the typical rule of thumb for safe human exposure to high RF fields?
Ok, here are the bands, and proposed power/antenna/field strengths?
9kHz and below - unknown power. Antenna most likely to be very short relative to wavelength. (not sure if would run wire around a perimeter of a property or a room, or would erect a short vertical radiator).
160-190kHz - 1 watt, 15-meter antenna
9-490kHz - 2400/kHz uV/m @ 300m
490-1705kHz - 24000/kHz uV/m # 30m
510-1705kHz - 100 milliwatts, 3 meter antenna (also could be 15uV/m at 47715/kHz meters)
1705kHz-10MHz - 100uV/m @ 30m (or 15uV/m @ 30m, or bandwidth(kHz)/frequency(MHz) uV/m @ 30m)
13.553-13.567MHz - 15.848mV/m @ 30m
26.96-27.28MHz - 10mV/m @ 3m
40.66-40.7MHz - 1mV/m @ 3m
49.82-49.9MHz - 10mV/m @ 3m
88-108MHz - 250uV/m @ 3m
902-928MHz - 50mV/m @ 3m
2400-2483.5MHz - 50mV/m @ 3m
5725-5875MHz - 50mV/m @ 3m
24-24.25GHz - 250mV/m @ 3m
300 GHz and above (can separate infrared, visible light, ultraviolet, x-ray, gamma ray, cosmic ray, etc) - currently unknown. (note that signal would need to be able to pass through optically solid objects - would this range even with high power be unusable?)
EDIT #1: I just came across <a href=http://www.srs.pp.se/phpBB2/viewtopic.php?t=22&sid=b53b4590da6952f9e5ce57e06b608434>this website</a>. I noticed they give some specs for AM broadcast. I'd basically like to know what those specs are for these other bands, too, and/or how to figure them out.<P ID="edit"><FONT class="small">Edited by tfcwings on 10/01/05 06:18 PM.</FONT></P>
What is the typical noise floor (in mV/m, uV/m, etc, or dBu or dBm)?
How do you convert dBm to mV/m (or dBu to uV/m)? (this I think would apply to ALL frequency bands)
What's the typical rate of loss in relation to distance? (if I know my signal is a certain intensity at a certain distance, how do I figure out the intensity or distance at someplace else if I know one of those two values?) Also how would ground conductivity affect these calculations?
Basically, with the power/antenna/field levels specified, how far under normal conditions should I expect a signal to go that is one of several modes - CW, SSB AM 5kHz, mono DSB AM 10kHz, stereo AM 15kHz, narrowband FM 5kHz mono response, wideband (200kHz channel) FM, TV (6MHz)? (if you want to just specify for one mode, and tell me how to make necessary calculations to figure out for other modes, that's ok) (for bands in which something won't fit, don't include it)
If I think of anything else, I will edit (or if it won't let me, reply to) this message.
If power or field strength is not specified, what's the typical rule of thumb for safe human exposure to high RF fields?
Ok, here are the bands, and proposed power/antenna/field strengths?
9kHz and below - unknown power. Antenna most likely to be very short relative to wavelength. (not sure if would run wire around a perimeter of a property or a room, or would erect a short vertical radiator).
160-190kHz - 1 watt, 15-meter antenna
9-490kHz - 2400/kHz uV/m @ 300m
490-1705kHz - 24000/kHz uV/m # 30m
510-1705kHz - 100 milliwatts, 3 meter antenna (also could be 15uV/m at 47715/kHz meters)
1705kHz-10MHz - 100uV/m @ 30m (or 15uV/m @ 30m, or bandwidth(kHz)/frequency(MHz) uV/m @ 30m)
13.553-13.567MHz - 15.848mV/m @ 30m
26.96-27.28MHz - 10mV/m @ 3m
40.66-40.7MHz - 1mV/m @ 3m
49.82-49.9MHz - 10mV/m @ 3m
88-108MHz - 250uV/m @ 3m
902-928MHz - 50mV/m @ 3m
2400-2483.5MHz - 50mV/m @ 3m
5725-5875MHz - 50mV/m @ 3m
24-24.25GHz - 250mV/m @ 3m
300 GHz and above (can separate infrared, visible light, ultraviolet, x-ray, gamma ray, cosmic ray, etc) - currently unknown. (note that signal would need to be able to pass through optically solid objects - would this range even with high power be unusable?)
EDIT #1: I just came across <a href=http://www.srs.pp.se/phpBB2/viewtopic.php?t=22&sid=b53b4590da6952f9e5ce57e06b608434>this website</a>. I noticed they give some specs for AM broadcast. I'd basically like to know what those specs are for these other bands, too, and/or how to figure them out.<P ID="edit"><FONT class="small">Edited by tfcwings on 10/01/05 06:18 PM.</FONT></P>