these frequencies go unused in this country. They should allow part 15(or some type of license by rule service) to operate on these 3 frequencies using more liberal standards than for the rest of the band. 1700 should also be authorized for these liberal rules provided you are "X" amount of distance from the few existing stations occupying 1700. Just wishful thinking 🙂
Say 1W input to final RF stage and a 15 meter antenna.
Since no one is there interference should not be a problem
I think there is some other restriction to 1710 IIRC. Which is odd to me, because I've not owned a vehicle in 10 years that did not have a radio that tuned that high.
Anyone know the techie reason for not planting a 100mW Part 15 TX on this channel? And since I know the answer to "does anyone know" would that "anyone" mind tossing the explanation out in something normal hamsters can understand as well? 🙂
Parts 15.209 OR 15.219 apply for operation up to 1705 kHz. (which includes the sidebands) so accounting for the sidebands, the highest carrier frequency allowed will be 1700 kHz.
Above 1705 kHz a new set of rules applies; part 15.223 which limits the field strength to 15 uV/m at 30 meters and which does not specify transmitter power nor antenna length (as does 15.219) as an alternative.
Interestingly, the field strength allowed under 15.209 at 1700 kHz is 14 uV/m at 30 meters, and at 1710 kHz it is 15 uV/m at 30 meters under 15.223.
So, according to the rules one can operate at 1710 kHz as long as the field strength stays within the limits. The 100 milliwatt, 3 meter ant. rule does not apply and can't be used at this frequency though.
More of a legal thing than a techie thing.
Neil
Do we really want more regulations on part15? Sure,it would be nice if we could have a few channels where more range is allowed. But that would be kaos! What would happen if there were more part15 stations than available channels? More regulation? Approaching a licensed service again,which we may not like or want.
There are part15 assignments on other bands,like 13.56mhz,49mhz,160 to 190khz,even 27mhz to play with if you arent that interested in having a public audience.
You can also put up a bunch of legal part15 broadcast stations to increase coverage. I would like to hear from anyone doing multiple AM and FM transmitter sites as I am entertaining that concept. I am currently simulcasting on AM,FM and 13.56 SW.
Regards,Lee
http://www.freewebs.com/wilcomlabs/index.htm
Hi Lee,
You and I seem to be in agreement about how extra channels with higher power/antennas would play out. I, too, think it would evolve into a licensed or at least a regulated service.
How does your 13.56 MHz operation perform? Have you ever received any QSLs? If I have my facts straight I am about 180 miles from you which might put me too close to hear your station. I will give it a try anyway. Is your frequency 13.560000 MHz?
Neil
13.5600AM,1610AM,101.5FM,24/7/365
I give an email address for questions/comments but havent gotten any response. Local hams can hear it within a 5 mile radius. I am in EN92XC.
Regards,Lee
http://www.freewebs.com/wilcomlabs/index.htm
Even just a loosening of the antenna restrictions on part 15.219 and keeping the 100mW input. allow the operator to install whatever kind of antenna ground he chooses and keep the 100mW Power input restriction.
We are talking AM here. a 100mW even into a full 1/4 over a 1/4 wave ground plane is not going to cause any interference and lets face it. how many people are going to go to those extremes for 100mW. there is not much interest in part 15 as it is and maybe less than 1% of those can afford and/or are willing to go to those extremes.
the people who get into AM are people who truly want to serve their community and 99% of part 15 am people will co-ordinate with each other to mitigate interference.
look at the georgia cluster. they all pooled their resourses and made a massive community network.
Thank You,
Rev. Robert P. Chrysafis
Universal Life Ministries
http://www.ulc.org
Moderator Hunterdonfree
http://groups.yahoo.com/group/hunterdonfree