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Re: [LPFM] blowhole fm

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Message #3377 of 6138 |

Re: [LPFM] blowhole fm

> So use a dipole (approx 3dB gain)

I'm fairly sure a standard dipole was considered the base unit for measuring antenna gain, and it was given a 0db gain rating. ie. All other antennas gain is based on the dipole. I've always based by calculations around this fact. Maybe I'm wrong.

Ross.

Mon Feb 7, 2005 10:02 pm

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"Ross Levis" <ross@...>

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Message #3377 of 6138 |

Expand Messages	Author	Sort by Date
What do you mean Richard? Do you know something I don't? ... From: Richard Phelps To: LPFM_Radio@... Sent: Friday, December 03, 2004 11:53 PM ...	Ross Levis rosslevis	Dec 3, 2004 11:04 am
They got 96.7...	Richard Phelps customcuts_nz	Dec 4, 2004 2:54 pm
What sort of licence is it do you know? Commercial or somewthing else? RSM must be happy with 600khz separation. Radio Pacific is on 96.1 here, which was an...	Ross Levis rosslevis	Dec 4, 2004 9:12 pm
Hi Ross, No idea - I just got the press release. Theres nothing on RSM's website about the new freq yet although they have mentioned the feasibility of a...	Richard Phelps customcuts_nz	Dec 5, 2004 1:42 am
Joe Hodge Wanganui, Music Memories FM 88.6, Wangani Community Based Radio Staion for Senior Citizens We are a charitable natured organisation. A big Hi to the...	Jo Hodge j.c.hodge.bro@...	Feb 6, 2005 8:51 pm
Isn't 1 watt twice what you are allowed under the rules of LPFM here in NZ?? I'm just checking because I'm about to buy a TX too and 1 watt would be...	Michael Rowse valdusradio	Feb 7, 2005 5:33 am
... As I understand it, the 500mW is "radiated power" measured a certain distance from the antenna, not transmitter power, so it depends on what your antenna...	Chris Mackerell owdjim	Feb 7, 2005 5:46 am
Yes, but when you take into account loss due to SWR (which are affected by a number of factors), loss through co-ax cable, the fat pigeon that roosts on your...	Mix FM mix_fm_welli...	Feb 7, 2005 5:53 am
Do I? OK, here's how it works. First the golden rule: Everything in FM works backwards. Why? Receive level dictaes radiated power which dictates antenna gain...	Jochen Siegenthaler jochensiegen...	Feb 7, 2005 8:13 pm
Er Jochen, Since when has a dipole antenna had 3db gain? I am assuming a 1/2 wave ant. Cheers Brian ... Do I? OK, here's how it works. First the golden rule:...	Brian Gallagher brianislay	Feb 7, 2005 8:52 pm
... I'm fairly sure a standard dipole was considered the base unit for measuring antenna gain, and it was given a 0db gain rating. ie. All other antennas gain...	Ross Levis rosslevis	Feb 7, 2005 10:02 pm
Isn't the base unit on which antenna gains are measured is an isotropic radiator? A dipole does not radiate in an isotropic fashion but instead a flattened...	mixfm@... mix_fm_welli...	Feb 7, 2005 10:20 pm
I blame my poor memory :-) I've checked with the experts, a standard dipole has a nominal gain of 2.2dBi. But the principles are the same. I always forget the...	Jochen Siegenthaler jochensiegen...	Feb 7, 2005 10:25 pm
You can use dBi (gain over isotropic) or dBd (gain over a dipole) A dipole has 2.2 dBi, or 0dBd Remember the basics: To quote something in dB is only correct...	Jochen Siegenthaler jochensiegen...	Feb 7, 2005 10:28 pm

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