"Geoffrey S. Mendelson" wrote in message
...
On Thursday, July 19, 2012 4:20:02 PM UTC-7, foxbrain wrote:
hi

i'm just new to this field and i need some help on it and i appreciate

any help...

my aim is to make a 315 or 433 transmitter and receiver so what ics is

the best for that and where can i buy them and so for the antennas(but i

would like to build them)...

wrote:

You have no business on either of those frequencies.

Depends upon where you are.

433mhz is a SHARED ham band throughout the world.

In ITU zone 1 and possibly elsewhere, there is a small allocation
of 433mHz for unlicensed devices.

There also is one at 315mHz, but that may be a different part of the
world.

It is used for wireless doorbells, security systems, etc. Basicly low
power
unlicensed telemetry.

If you look on eBay, you will find hundreds of the devices. A quick web
search
shows the 433 mHz units sold in the US.

Geoff.


--
Geoffrey S. Mendelson, N3OWJ/4X1GM/KBUH7245/KBUW5379




315 mHz is in a band used by the US military, where they are already
"tolerating" a fair amount of intrusion from garage door openers and similar
devices. I was privvy to some US Navy classified message traffic that
discussed the issue. (It was classified because it identified specific
frequencies and such are always classified.)

This fellow, "new to the field," as he self-indentifies, seems like a source
for interference more than learning. A bit risky.

73,
"Sal"

Sal M. O'Nella wrote:
315 mHz is in a band used by the US military, where they are already
"tolerating" a fair amount of intrusion from garage door openers and similar
devices. I was privvy to some US Navy classified message traffic that
discussed the issue. (It was classified because it identified specific
frequencies and such are always classified.)

This fellow, "new to the field," as he self-indentifies, seems like a source
for interference more than learning. A bit risky.

It depends upon where he is. Outside of the US, the US military is a guest,
and has no authority to use those frequencies. Certainly no claim.

There was an international incident here in Israel a few years ago when
a foreign miltary ship with a new radar system parked off the coast of
Lebanon with a new radar system which used the downlink frequency for our
local DBS system.

Within a week, the radar system was shut off, and they ship left.

So just because a military uses a frequency in their home country does not
mean that anyone elsewhere can not use it if it is legal, nor can that
military tell them to stop.

Geoff.



--
Geoffrey S. Mendelson, N3OWJ/4X1GM/KBUH7245/KBUW5379

"Geoffrey S. Mendelson" wrote in message
...
Sal M. O'Nella wrote:
315 mHz is in a band used by the US military, where they are already
"tolerating" a fair amount of intrusion from garage door openers and
similar
devices. I was privvy to some US Navy classified message traffic that
discussed the issue. (It was classified because it identified specific
frequencies and such are always classified.)

This fellow, "new to the field," as he self-indentifies, seems like a
source
for interference more than learning. A bit risky.

It depends upon where he is. Outside of the US, the US military is a
guest,
and has no authority to use those frequencies. Certainly no claim.

There was an international incident here in Israel a few years ago when
a foreign miltary ship with a new radar system parked off the coast of
Lebanon with a new radar system which used the downlink frequency for our
local DBS system.

Within a week, the radar system was shut off, and they ship left.

So just because a military uses a frequency in their home country does not
mean that anyone elsewhere can not use it if it is legal, nor can that
military tell them to stop.

Geoff.

I thought they were internationally allocated worldwide ... that is, certain
bands like 225-400 were reserved for government use, exclusively. (I guess
even so, government could certainly be non-military, too.)

Thanks for the info.

Overcoming my ignorance one day at a time,
"Sal"