433MHz remotes with >500ft range

Talking from experience are we?

 

This is where a number of folks insult you... and your mother... and
your little dog too!

You are about as utterly brainless as a person can get, and you claim
to be mature and educated. That claim is truly hilarious, and pathetic.

 

Perhaps I should qualify that. It certainly did when I was in Florida
20 years ago.

 

On Tue, 02 Nov 2010 18:39:37 -0700, TutAmongUs
^^^^^^^^
Another silly nym for your list, Michael.

 

Sorry, I haven't seen that one before.

What's the score now? Not that a list is necessary. Nymbecile's posts
are easily recognised.

 

You must still be on the sauce, you don't get it!

 

You are still in the barrel, dog piss mouth.

Qualify? Bwuahahahahahahahaha!

 

Simple proof that he is about as stupid as one can get. But hey, the
dumbfuck reads your pathetic horseshit, so it is a given that he is a
total retard.

 

Mouthy Mikey Picks and Chooses whom he wishes to mouth off at directly.

In other words, the motherfucking wuss is too pussified to banter with
real men. Even those he chooses to spat upon are far better than he.
Merely by the fact that he does it (insult) to those he has chosen to be
a fucking mouthy putz toward.

Good job, Micheal. NOT!

 

Care to repeat that rubbish? In English this time, please.

 

Jeez, it doesn't get much more wussified than a spelling lame and the
third person dialog... again.


Bwuahahahahahhahahaha! You're a joke, T E R R E L L

Did I spell that one right, ASSWIPE?

 

^^^^^^
Lurn tu spel Nymbecile. It's ARSEWIPE

 

Can't get into details but think "farm" or "golf course"

AFAIK they simply used its alarm clock function, at least that's what
our morning paper reported.

 

From propagation point of view, those are quite a bit different
situations.

At 150 m and 433 MHz, the free space loss is less than 70 dB, so even
if the transmitter power is less than 10 mW (+10 dBm) to remain within
international standards, the receiver power would be -60 dBm, i.e. a
very generous signal at least compared to thermal noise from the
receiver itself or the surroundings.

However, this assumes free space propagation, which should not be too
hard to achieve with one antenna in a high place on a golf course.
Some light vegetation (bushes) should not cause much problems on 433
MHz.

However, golf courses are typically locating within a short driving
distance from population centers, so if the receiving antenna is in a
high place, it will pick a lot of signals from other non-licensed
devices in the band, making it impossible to predict a reliable
communication range. The situation with a single transmitter high up
and the receivers close to ground is easier, since the terrain will
somewhat block distant signals.

The situation on a farm in the middle of nowhere is quite different,
you usually do not have to worry about other emitters on the band, so
a receiver high up in the air should not suffer. However, large
concrete or metallic structures often found on a farm, will cast a
shadow, if you are just behind it.

You need to specify the environment more accurately or take the worst
case of both the farm and golf course example to determine the
reliable range in an unspecified environment.

 

This assumes a full-blown antenna though which is usually not possible
or desired. Mostly it's the "rubber duckie" kind, meaning another 10dB
or so drop.

This is something that at least in the US we don't have to worry much
about. We live on a hill with the high-gain antenna pointing towards
Silicon Valley. No problem to listen to signals from there yet the 70cm
ham band is almost deserted. Not much going on there.

Non-licensed signals are quite weak and a good hopping scheme can get
around that. Problem is, most remotes aren't that smart.

Way to deal with that is, for example, FHSS. As long as the receiver
won't choke in the presence of strong signals and that's what I find to
be a rather sore point with modular designs. There I'd rather design my
own. But not the remote, that should come pre-certified and all. The
challenge that this presents is that many FHSS schemes are kept secret,
for whatever reason.

That is what we'll have in most cases, some sort of building the signal
has to go through. Or bounce around and get there on a secondary path
with a lot less amplitude.

Sure, but first I'd have to find a viable solution. Then we'll try it
out in the field. The solution requires most likely finding a good
quality remote with full documentation, then a matching chip set to
build a receiver around that. I'd really like to design my own receiver
because my experience with commercial modules is, let's say, rather "mixed".

 

Use a diversity receiver and several strategically located antennas.

 

I know, but in this case we don't want to drive the effort quite that
far