Assasin-uk

Ok whilest im still reading 3 books on the go (Jeff Duntemann's wifi guide , WDDD, and wireless hacks) i thought i would ask some more questions..
Apologies if there are still noobish..

Ive orderd my wireless nic card from ebay..
Link , It is running the Herms chipset and not the proxim one so hopefully it will be ok.. Comments? This guy was realy helpfull btw..

One other thing, the pci converter, on http://www.fab-corp.com/ website they show 2 types of converter.. a cardbus on and a generic ricoh one which one am i after for my new nic?

The pig tail for this, i need an N type female right?

And when it comes to cableing... Whats the best low loss cable to use with this type of equipment? ive seen some LMR900 on fab corp again and it says "boasts an incredible 2.92 dB of loss for every 100 foot at 2.4 GHz!"
Is it my or is that alot of loss for 100foot?


And last but not least the antenna..
I was originaly thinking of fitting some type of yagi on a rotator on my roof, but after reading about radial patterns and not being able to find a real high Db yagi im thinking of looking for the highest Db omni i can find..

I just want to make the best possible range i can from my static location without having nasa on my roof.. anyone know of a 20Db omni? or is this unrealistic..

Any advice gladly welcomed...

/me puts on flame suit and anti sarcasm helmet..

__________________
Thanks in Advance.

Mark
Assasin-uk
www.xtremesystems.org

Thorn

That should be fine.

The Ricoh has the best compatibility, and since the ORiNOCO is a 16-bit card, it will be fine.

Typically you need an MC (ORiNOCO) to N-Male pigtail. Although the Ebay link shows an antenna that doesn't require a pigtail at all.

Actually that is VERY low loss.

Here's a quick repeference:
Attenuation (dB at 2.5GHz per 100 ft.)
You can look up the full chart at the Times Microwave site.

You probably don't actually want LMR900. It's really made for things like microwave or cellphone towers. It is almost 1 inch in diameter, and very had to work with. The connectors cost about $50USD (about £90 at the currect exchange rates) each.

As any FYI, most WISPs typically never use more than LMR400.

All of this cable requires special tools. You really need the proper tools to work with this stuff, or you'll introduce loss when you attach the connectors. Can you do it with a jackknife, a pair of dikes, and a pair of pliers? Sure you can. You can also do surgery with those same tools, but either way you won't like the results.

Here's what you'll need:

• Crimper with a full set of dies
• Coax stripper
• Coax cutter

This will cost about $100-$200USD (£180-£360.)

It's unrealistic. You might find one, but the pattern would be so flat as to be unusable. A 12dBi omni typically has a horizontal pattern of only 15º. A 20dBi omni would only have a pattern of 2º-3º. If this make no sense, look at page 18, Figure 1.12 of WDDD, which explains this concept of omni patterns. The Antenna FAQ also has some information on patterns.

I'm not sure what you consider "high" gain. Here's a quick chart showing some typical gains for the standard antenna types:

• Omni: 3dBi to 12dBi
• Yagi: 8dBi to 15dBi
• Panel: 13dBi to 19dBi
• Sector: 13dBi to 19dBi
• Dish: 19dBi to 24dBi

Obtaining "super" high gain is impossible, or so impractical as to amount to the same thing. Just as an example: The Radio Telescope at Arecibo has a gain of about 70dBi at 2.5GHz, but you probably can't afford that.

__________________
Thorn
"Lawyers should never marry lawyers. This is called inbreeding. It produces idiot children and more lawyers."

sykojester

Wow Thorn, that was more useful information that I could shake a stick at. I liked your comparison to the Arecibo dish. Very cool. Are you in the search for E.T., too? hehe

As for the conversation at hand...Yeah, LMR400 is pretty much the standard of everything I've seen used, esp. in pigtails which I have quite a few of now. I guess if you were gonna run an antenna up to the roof, you may want to use something like LMR900, but from what Thorn says, that would get mighty expensive REAL quick. I don't even want to know how much that stuff costs a foot (too lazy to look it up).

I say get off yer but and actually stumble! It's no fun just playing w/ stuff in your own hope. This is unless you wanted some high gain antenna to link to another station in a legal type of way.

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I was at this place one time & I was like...Wow.

Thorn

I'm all about the service, or something like that.

Nope, no ET for me. I remembered thought that someone (Mr. White?) looked up Arecibo up. It was about 8 or 9 months ago. Ther was some newbie insisting that he could make a 100dB antenna if we'd would only give him the sizes. When we said it would be too large to be practical he become mad, and was complaining we wouldn't tell him just because he was new. The moron couldn't or wouldn't understand that physics limit radio waves.

If Arecibo is ~70dBi, then a 100dBi dish it would be the size of that dish on the DeathStar. Maybe ol' Darth Vader was just trying to do some intergalactic WarDriving...

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Thorn
"Lawyers should never marry lawyers. This is called inbreeding. It produces idiot children and more lawyers."

sykojester

I wonder what how far old Darth could do a link? hehe. I'd like to see his WWWD or IntergalaticDrive stats :P

Anywho, moving off topic, nice info none the less.

__________________
I was at this place one time & I was like...Wow.

SignalSeeker

Also a minor thing, if you go with a Yagi on a rotor even LMR400 wont like the twisting and turning much. It would probably strain the heck out of the N connector on the the yagi.

I am thinking I read that LMR400 is supposed to not have a sharper bend than like a one foot radius.

Get a big omni, 12db is a good number. We have a WISP moving in near and I believe they use 12db omnis on the there Mesh network.

Justin

The Others

/ a continuing off-topic spiral.

Darth would bein trouble when it came to WWWD becuase of a lack of GPS co-ords.

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all good ends all

sykojester

TheOthers: very valid point, didn't think of it like that. Would be funny to see a few hundred thousand APs w/ relatively the exact same GPS cords. I wonder how a gps would function in space. Maybe it'd at least get the altitude right. hehe.

Gotta love those random thoughts that occupy ones mind.

__________________
I was at this place one time & I was like...Wow.

Assasin-uk

Thanks for the thoughts guys...

Having still not moved into me new house yet im going to invest in a cheap laptop and go driving...

Hopefully me orinoco gold card and freebie mag mount omni should be here this week....

And if all goes according to plan ive just purchased a cheap Dell p2 500 laptop..

I will keep you all informed!!

Many thanks.. (still reading the books Thorn)

This whole war driving thing is getting addictive...

__________________
Thanks in Advance.

Mark
Assasin-uk
www.xtremesystems.org

Assasin-uk

At last all my wardriving kit has arrived..

orinoco gold, free 7db antenna. Cheapo Dell p500 laptop..

Ready for the my 1st run...

Well almost... shame the recon guy forgot to put a hard disk in my Dell

Now im waiting on the post tommorow...

And my car is going in for work on friday...

I will however be stealing the mrs's car...

Carnt wait.. reading all these books is not helping the craving..

Oh yeah sorry about poor quailty P900 phone pic..

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__________________
Thanks in Advance.

Mark
Assasin-uk
www.xtremesystems.org

peekitty

Congratulations on getting the kit together. Now then, did you seriously think you could get away with posting a picture of your disco-ballroom case mods without getting taunted mercilessly?

Assasin-uk

Disco ballroom case mods?

Thats a standard Vapochill XE, with a nexus fanbus controler and an lcd panel to show temps....

at 4.0ghz.... it does dance well though..

__________________
Thanks in Advance.

Mark
Assasin-uk
www.xtremesystems.org

peekitty

Yeah, I guess it's not quite as flashy as my rig.

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nleahcim

ahh my eyes!!