u/ElectroMast

From: Locked On Cougars podcast

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Cougars vs _____.

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Posted based off Reddit’s site wide rules 1 and 2

Heya there everyone!! Welcome to my profile!

I'm about to start researching low-power FM broadcasting theory very soon before purchasing or assembling any equipment as a full grown adult.

I’ll be looking at the math surrounding the FCC Part 15 limit (250 microvolts per meter measured at 3 meters)

Based on free-space path loss models, effective coverage seems limited to a very short radius.

First: What are the cleanest, compliant transmitter setups or antenna configurations for maximizing signal clarity within legal bounds?

Second: How do path loss calculations differ when accounting for suburban structures vs. open line-of-sight?

Looking purely for technical insight on RF propagation, filtering, and compliant Part 15 performance, and moderating the comments based off Reddit’s site-wide rules.

And under rules 1 and 2 I really have to break it to you! No harassment, intimidation or violence is allowed and I don’t wanna start an online fight with you so none of that is allowed either so if you do so I will report your account to the admins for harassment. Both also under rule 1 trolling and spam are a huge no-no so don’t spam in the comments either! I will block you if you do. And also remember the human.

One last thing under rule 8 before you comment: A lot of you like it on Reddit, including but not limited to…
• Cat lovers
• Low iq RF engineers
• Radio enthusiasts
• Low iq/effort radio engineers
…so DO NOT break the site either!1!

Edit under rules 2 and 7: And before I crosspost to r/AmateurRadio I’m warning you tonight! I will mod remove anything that seems like pirate radio!!

Edit 2 also under rule 2: And breaks the rules of that subreddit!

Edit 3 also under rules 1 and 7: And don’t tempt me either, First stop is Google AI’s most AI-recommended; r/pirateradio.

Heya there everyone,
I am planning a very low-power, micro-FM setup for a hyper-local solo project. My absolute top priority is maintaining 100% compliance with FCC Part 15 regulations for intentional radiators in the broadcast band (strictly staying within the 250 microvolts/meter at 3 meters limit).
Because I want to completely avoid any accidental "pirate" territory or interference with licensed broadcasters, I am looking for advice on the engineering side of things:

1. Measurement Tools: What is the most reliable, budget-friendly way to measure field strength or signal drop-off at the 3-meter mark to verify compliance? Would a basic SDR (Software Defined Radio) setup suffice for relative measurements, or do I absolutely need a calibrated field strength meter?

2. Harmonics & Filtering: For tiny, low-power dongles/transmitters, what kind of basic low-pass filtering should I look into to ensure I'm not throwing off spurious emissions or harmonics into adjacent bands?

3. Antenna Setup: What are the best practices for keeping the signal strictly contained within a small indoor radius?
I want to make sure my engineering is sound and entirely legal before anything is plugged in.

Any advice on the technical measurement side to guarantee compliance would be very greatly appreciated. Thanks in advance!

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Look. My ears aren’t steaming yet, but the pressure is building and the fuse is lit. I am trying to set up a legal, solo, compliant FM broadcast right here in Orem, UT. I do NOT want a non-compliant, uncertified piece of junk from Amazon being shipped to a locker. I want a setup that strictly respects the FCC’s uV/m at 3 meters limit (120 uV/m at 1 meter absolute minimum before it's just static). I am trying to avoid an NAL while actually getting full-quieting operation within a tight 10-20 foot radius.

Because LPFM is completely locked down for individuals and families, Part 15 is the only legal cliff I have left to hang onto.

I need TECHNICAL HELP ONLY. No lectures on how hard Part 15 FM is compared to AM. No unsolicited advice telling me to just give up and buy an illegal import.

The Ultimatum: You have exactly until the first firework explodes over the Utah Valley on July 4th. If there are two or fewer legitimate technical comments on this thread by then, the terrestrial experiment is dead. I will pull the plug, rage-quit the airwaves, and take my audio strictly to the internet.

Don't waste my time. And DO NOT make me block you! Give me actual engineering solutions for a compliant solo FM setup. Go!

Remember that I’ll check my Reddit notifications and this thread on my profile on July 4th when the fireworks start!

Hopefully no FCC fleet of black or white direction-finding vans pull over in front of our house to file an NAL due to a complaint from a neighbor.