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 Post subject: Reason for removal of my 0.5mW FM TX?
PostPosted: Sep Sat 11, 2021 5:16 pm 
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Joined: Mar Thu 01, 2018 1:30 am
Posts: 795
Is feeding well filtered 0.5mW FM signal into a tiny 47ohm 1/4 w carbon film resistor illegal? Why was it removed? May I know the reason? Is it illegal in the United States? Last time I checked I got a range of few feet only inside my room. Should I lower the power output to zero to keep it legal? This is clearly harassment by some particular moderator. The 0.5mW TX was carefully drafted as per the rules and regulations of FCC and this forum. A low pass filter was added too. Please tell me why it is illegal to post? mW means milliwatt, not megawatt FYI. This is ridiculous that my 0.5mW FM TX was removed. Expecting a public reply.


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 Post subject: Re: Reason for removal of my 0.5mW FM TX?
PostPosted: Sep Sat 11, 2021 5:36 pm 
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Joined: Jan Fri 06, 2012 8:47 pm
Posts: 7607
Dare4444 wrote:
Is feeding well filtered 0.5mW FM signal into a tiny 47ohm 1/4 w carbon film resistor illegal? Why was it removed? May I know the reason? Is it illegal in the United States? Last time I checked I got a range of few feet only inside my room.
It appears perfectly legal up to ranges of 200 ft. https://www.fcc.gov/media/radio/low-pow ... nformation

I saw that last post before it disappeared and saw nothing that I found concerning. I never saw if there were any responses to it.

Unfortunately radiated power is not specified in terms of what you are generating, but the field being produced see this... https://transition.fcc.gov/bureaus/oet/ ... t63rev.pdf page 15 for the FM band. Few people have the requisite measuring device for microVolts/meter (e.g. https://www.mrclab.com/rf-strength-magn ... elds-meter), but clearly something that does not radiate beyond 200 feet would be meeting the requirement.

Curtis Eickerman

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Last edited by Eickerman on Sep Sat 11, 2021 5:53 pm, edited 1 time in total.

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 Post subject: Re: Reason for removal of my 0.5mW FM TX?
PostPosted: Sep Sat 11, 2021 5:49 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 17002
Location: S. Dartmouth MA 02748-1225 USA
Dare4444,

Fair warning, re-posting a locked topic, even questioning moderators risks a strike against your account.

You have a lot to offer if you were to focus transmitter design to and for Hams where that is totally acceptable.

Projects for new Hams, projects to cope with Long wave, and new small space antenna designs for the top band and long wave, IMHO would be most help.


Continuing to stir the foul soup of banned topics will only get a probation or worse. You would be denying all those who would benefit from your imagination by "going away"...

chas

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 Post subject: Re: Reason for removal of my 0.5mW FM TX?
PostPosted: Sep Sat 11, 2021 5:59 pm 
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Joined: Mar Thu 01, 2018 1:30 am
Posts: 795
Okay Chas. I'll start designing ham radio transceivers then, or simple transmitter and receivers for the ham bands. LtSpice lets me perfect my ideas. So sharing circuits like 1W 2n2219A based amplifier for 2m ham band Or 144-148MHz is perfectly okay? I've a design on spice where 2n2219A is delivering 900mW on 145MHz.


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