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#1
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Richard the value changes per band and is stated in part 15. For example in
the broadcast band the formula is 24000 /F for microvolts at 1000 feet. There are certain bands that no emissions are allowed from a low powered device. For example setting up your neighborhood micro Rap Station on 121.5 MHz (aircraft emergency) would probably bring a swift shut down. I am still searching for the reg that allows fixed information stations. IIRC they can be run on 530 and 1750 KHz. I know in the past I had looked at the regs and the particular station I was researching was indeed legal. In the low freqs (140 KHz area) you can run up to 1 watt CW with out a license. "Richard Clark" wrote in message ... On Tue, 4 Oct 2005 17:31:37 -0400, "Fred W4JLE" wrote: In this case the milliwatts per meter refers to frequencies stated in meters. Hi Fred, Is this to suggest that for 300MHz it is 1mW total input power as say compared to 1MHz allowing 300mW? This would be uncharacteristically generous of the FCC whose regulations would ban emissions from dummy loads. Seems it would hardly serve Ari's search for pork, but I suppose grantsmanship would jump at sending a marathon of runners through the spill area - each carrying sub-Watt handi-talkies to provide the aggregate power, and spectrum, and lung volume necessary to "get the warning out." 73's Richard Clark, KB7QHC |
#2
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Not quite. That is the limit in 15.209, with the following caveat
"...except as provided elsewhere in this subpart..." Elsewhere in the subpart (15.219 and 15.221) we have the limit for the band 525-1705 kHz. (AM broadcast band) the 100 mW and 3 meter antenna restriction OR a 15 uV/m restriction at a distance of (47.715/(frequency in kHz.)) meters (which is also lambda/(2 * pi)) from leaky coax. BTW, it is 24000/F uV/m at 30 meters from 490 to 1705 kHz., which is more like 100 feet, not 1000 feet (15.209). Jim "Fred W4JLE" wrote in message ... Richard the value changes per band and is stated in part 15. For example in the broadcast band the formula is 24000 /F for microvolts at 1000 feet. |
#3
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On Tue, 4 Oct 2005 15:09:50 -0700, RST Engineering wrote:
Not quite. That is the limit in 15.209, with the following caveat "...except as provided elsewhere in this subpart..." Elsewhere in the subpart (15.219 and 15.221) we have the limit for the band 525-1705 kHz. (AM broadcast band) the 100 mW and 3 meter antenna restriction OR a 15 uV/m restriction at a distance of (47.715/(frequency in kHz.)) meters (which is also lambda/(2 * pi)) from leaky coax. BTW, it is 24000/F uV/m at 30 meters from 490 to 1705 kHz., which is more like 100 feet, not 1000 feet (15.209). Jim So if I need to go out 3500 feet or so, this won't work. Correct? -- Drop the alphabet for email |
#4
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Incorrect.
Jim "Ari Silversteinn" wrote in message ... BTW, it is 24000/F uV/m at 30 meters from 490 to 1705 kHz., which is more like 100 feet, not 1000 feet (15.209). Jim So if I need to go out 3500 feet or so, this won't work. Correct? -- Drop the alphabet for email |
#5
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You are correct Jim, mistyped the extra zero.
"RST Engineering" wrote in message ... Not quite. That is the limit in 15.209, with the following caveat "...except as provided elsewhere in this subpart..." Elsewhere in the subpart (15.219 and 15.221) we have the limit for the band 525-1705 kHz. (AM broadcast band) the 100 mW and 3 meter antenna restriction OR a 15 uV/m restriction at a distance of (47.715/(frequency in kHz.)) meters (which is also lambda/(2 * pi)) from leaky coax. BTW, it is 24000/F uV/m at 30 meters from 490 to 1705 kHz., which is more like 100 feet, not 1000 feet (15.209). Jim "Fred W4JLE" wrote in message ... Richard the value changes per band and is stated in part 15. For example in the broadcast band the formula is 24000 /F for microvolts at 1000 feet. |
#6
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Which zero?
On Tue, 4 Oct 2005 19:44:44 -0400, Fred W4JLE wrote: You are correct Jim, mistyped the extra zero. "RST Engineering" wrote in message ... Not quite. That is the limit in 15.209, with the following caveat "...except as provided elsewhere in this subpart..." Elsewhere in the subpart (15.219 and 15.221) we have the limit for the band 525-1705 kHz. (AM broadcast band) the 100 mW and 3 meter antenna restriction OR a 15 uV/m restriction at a distance of (47.715/(frequency in kHz.)) meters (which is also lambda/(2 * pi)) from leaky coax. BTW, it is 24000/F uV/m at 30 meters from 490 to 1705 kHz., which is more like 100 feet, not 1000 feet (15.209). Jim "Fred W4JLE" wrote in message ... Richard the value changes per band and is stated in part 15. For example in the broadcast band the formula is 24000 /F for microvolts at 1000 feet. |
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