🚀 go-pugleaf

Something strange about this apparently sophisticated app and yet needing 
all this basic info...

"Vitaliy" <vmykhayl@ee.ryerson.ca> wrote in message 
news:1153515781.364641.262600@p79g2000cwp.googlegroups.com...
> dmm wrote:
>> On 20 Jul 2006 12:21:39 -0700, "Vitaliy" <vmykhayl@ee.ryerson.ca> wrote:
>>
>> >Hello,
>> >Can someone please explain me how the coaxial cables work?
>> >I'm looking for low loss BNC and SMA cables - 50 Ohm. Low loss is a
>> >requirement, and as long as the  price is not $1/ft for 500ft, any
>> >reasonable price is ok. Most of my applications are <200MHz.
>>
>> How much loss can you tolerate? What are the frequencies your application
>> will be using? What is your RF budget? What distances will you be 
>> transmitting
>> your signal(s)? What will you be transmitting, RF or data? Do you need to 
>> run
>> the coax around tight corners? Do you need coax that is low smoking and 
>> free
>> of halides?
> Right now we are using RG58, so it's about 16dB for 100m, slashing that
> by 8 dB would be good.
> The frequencies are anywhere between 5MHz and 500MHz.
> I'm looking at somewhere ~$400 for 500ft. Distances - 1 to 3 meters
> (maybe 1 or 2 10m ones).
> I will be transmitting data and RF.
> I don't see the need for tight corners at this point, but it would be
> "nice to have" option.
> No requirement for low smoking/free of halides, but would be
> "nice-to-have".
>
>> All coaxial cables (and connectors) exhibit attenuation (loss) over 
>> distance.
>> Do you consider $1/ft too expensive or too cheap?
>>
>> >I see here http://www.gme.net.au/land/antennas/coax_cables.php
>> >that RG58AU is a low loss BNC
>>
>> RG58AU is a type of coaxial cable. BNC is a type of connector. 
>> Distributors
>> that describe a BNC coax cable are talking about a cable that is 
>> terminated
>> with one or more BNC connectors.
>>
>> Many BNC connector manufacturers have versions of their connectors
>> for crimping, soldering, or just screwing them onto the prepared RG58 
>> cable.
>>
> Therefore, if, for example, I buy Belden cable, I can just buy BNC, SMB
> or SMA connectors for that particular cable?
>
>> >from the data here http://www.ssbusa.com/comaircom.html
>> >RG 213 seems to have even lower loss value
>>
>> Yes, but it has a larger diameter than RG58 and is more rigid. I 
>> recommend
>> using crimp connectors to terminate RG213 coax because soldering the 
>> terminal
>> pin is a bugger without melting the dielectric slightly. And it takes 
>> practice.
>>
> I was also thinking about buying crimp connectors, smothing like this
> http://www.integratednetworkcable.com/productDetailsPopUp.asp?idproduct=1071
> or from here
> http://www.danimex.com/Default.aspx?ID=1363
>
>> >Now, on that last website ECOFLEX has even lower db loss. Ecoflex 10
>> >can work with BNC, does it mean I can use it as conventional BNC cable,
>> >just with low loss?
>>
>> Yes if connectors are available, and its probably a good deal more 
>> expensive too.
>> And 10mm diameter as opposed to about 6.5mm to 7mm for RG58 (I think)
>> But with the extra copper shield the ECOFLEX 10 will be somewhat more 
>> rigid
>> than the RG58.
>
>> >I read the BNC connectors are for average speed and SMA connectors are
>> >for high-speed. Is it true? And can I place BNC, SMA and SMB connectors
>> >on the cable from the same spool?
>>
>> What is "average speed" and "high speed"? The simple answer is to ask the
>> cable manufacturer/distributor which connector is suitable for the cable 
>> for
>> your application. They should have a list of preferred  connector 
>> manufacturers
>> and any suitable connectors.
>>
>> >Thanks,
>> >Vitaliy
>