NetStumbler.org Forums - View Single Post - 10 foot sat dish: why did you lock my thread?

rufusputnam · 09-12-2005

Wow. I'm sorry. Lots of obscenities and incorrect assumptions about what I'm doing.

At least I got the answer to my question:

The thread was locked because it is ILLEGAL to run this as Part 15.

Thanks for explaining why it was locked. However, it's not my intention to run an illegal setup. I know I'm just throwing gas on the flamefest, but let me explain what I'm doing, then I'll go away.

First, some accused me of being a thief, stealing internet access. Nope. My test connection is a public access point (as I said) run by the local government. Free. Public. If only other local communities were so enlightened.

But ultimately I want to run a link to a co-worker's home in the same general vicinity. If I can get a QRP (low power, for you non-hams) part 15-legal link up then I've got a means to access our company's VPN, and the general internet as well (and yes, our IT dept is cool with this, for those who might also accuse me of stealing from my own company).

The reason for my original question ("Recommendations for a feed horn for a 10' dish?") is that I have an abandoned 10' TVRO dish here, and if I run my rig sufficiently QRP I have the advantage of tremendous receive sensitivity while transmitting within legal limits. Part of this exercise is simple technical curiosity, to do it and learn from it.

If I've misread the part 15 stuff about ERP, please enlighten me. However, to my current understanding, it's not illegal to use a 10' dish under part 15, only to transmit a signal that's in excess of the legal limit.

For 802.11b point to multi-point uses, you are allowed up to 30 dBm or 1 watt of Transmitter Power Output (TPO) with a 6 dBi antenna or 36 dBm or 4 watts Effective Radiated Power over an isotropic antenna (EIRP). The TPO needs to be reduced 1 dB for every dB of antenna gain over 6 dBi.

No mention of antenna type or size. It's easy to pad tx output power, and to measure final output to assure compliance.

So the reason I originally posted my technical question about dish feeds was because I thought someone here might be able to share their knowledge. I didn't intend to piss anyone off.

09-12-2005	#7 (permalink)
rufusputnam Registered Member Join Date: Sep 2005 Posts: 3	Wow. I'm sorry. Lots of obscenities and incorrect assumptions about what I'm doing. At least I got the answer to my question: The thread was locked because it is ILLEGAL to run this as Part 15. Thanks for explaining why it was locked. However, it's not my intention to run an illegal setup. I know I'm just throwing gas on the flamefest, but let me explain what I'm doing, then I'll go away. First, some accused me of being a thief, stealing internet access. Nope. My test connection is a public access point (as I said) run by the local government. Free. Public. If only other local communities were so enlightened. But ultimately I want to run a link to a co-worker's home in the same general vicinity. If I can get a QRP (low power, for you non-hams) part 15-legal link up then I've got a means to access our company's VPN, and the general internet as well (and yes, our IT dept is cool with this, for those who might also accuse me of stealing from my own company). The reason for my original question ("Recommendations for a feed horn for a 10' dish?") is that I have an abandoned 10' TVRO dish here, and if I run my rig sufficiently QRP I have the advantage of tremendous receive sensitivity while transmitting within legal limits. Part of this exercise is simple technical curiosity, to do it and learn from it. If I've misread the part 15 stuff about ERP, please enlighten me. However, to my current understanding, it's not illegal to use a 10' dish under part 15, only to transmit a signal that's in excess of the legal limit. For 802.11b point to multi-point uses, you are allowed up to 30 dBm or 1 watt of Transmitter Power Output (TPO) with a 6 dBi antenna or 36 dBm or 4 watts Effective Radiated Power over an isotropic antenna (EIRP). The TPO needs to be reduced 1 dB for every dB of antenna gain over 6 dBi. No mention of antenna type or size. It's easy to pad tx output power, and to measure final output to assure compliance. So the reason I originally posted my technical question about dish feeds was because I thought someone here might be able to share their knowledge. I didn't intend to piss anyone off.