Menu

Transmit but not Receive

Search this Thread

Prev

Previous Post

Next Post

Next

#8

Report Post

Old

August 23rd 06, 12:43 AM posted to rec.radio.amateur.antenna,alt.internet.wireless

Richard Clark Richard Clark is offline

Richard Clark is offline

external usenet poster

First recorded activity by RadioBanter: Jul 2006

Posts: 2,951

Default

Transmit but not Receive

On 22 Aug 2006 16:28:09 -0700, wrote:

Why would there be a significant problem in the first place....
these aren't CW devices, they are Packetized Spread Spectrum
and two devices next to each other, even on the same channel, would
not run into each other, due to different spreading code roots
anyway..... Hmmmmm, non problem, from where I sit.....

I'm running 802.11b @ 2.4Ghz. As I understand it at 11Mbps (which I'm
using) the signal is "spread" using the CCK code, and each packet/user
uses the same spreading function. So a transmission only goes forward
if the channel is "empty", i.e. the received power at the transmitter
is below some carrier sense threshold (dBm)......

Hi All,

Spread Spectrum is merely the 0 level of the protocol stack and has
nothing to do with "going forward." That is a software issue at a
much higher level that deals with packet collisions. The hardware may
augment collision detection through carrier sense (which would only
occur if both share the same code). In fact, thresholds may be well
below the noise floor (dBm) and still work with notably lower
throughput, but this is an even more remote issue, except you may be
fighting poor isolation from even the best of isolators.

73's
Richard Clark, KB7QHC

Reply With Quote

Reply With Quote

Thread Tools	Search this Thread
Show Printable Version	Search this Thread: Advanced Search
Display Modes
Switch to Linear Mode Switch to Hybrid Mode Threaded Mode

Posting Rules
Smilies are On [IMG] code is On HTML code is Off Trackbacks are On Pingbacks are On Refbacks are On

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
You too can receive $50,000 from spending only $5.00...read this to find out how, and receive a special added bonus!!! You too can receive $50,000 from spending only $5.00...read this to find out how, and receive a special added bonus!!!	Brooklynspy	Antenna	0	September 28th 05 05:01 PM
Are these antennas any good for both transmit and receive?	[email protected]	Antenna	10	January 15th 05 04:52 PM
Distance between transmit and receive antennas on 160 meters	Metalhead	Antenna	4	January 28th 04 05:09 PM
Active antenna combiner (transmit & receive), 30-87 MHz	Stefan Moscibroda	Antenna	0	August 24th 03 08:52 PM

All times are GMT +1. The time now is 03:05 PM.

About Us

"It's about Radio"

Contact Us RadioBanter forum home Privacy Statement

Copyright © 2017