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LMR-600 OK?

P

Peddler 356

Guest
Hey Hook !!!



Aren't radios like race cars?<img src=http://www.ezboard.com/intl/aenglish/images/emoticons/laugh.gif ALT=":lol">



Price shouldn't be a question <img src=http://www.ezboard.com/intl/aenglish/images/emoticons/roll.gif ALT=":rollin">



Jim




The Peddler............

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For 170 feet, you'd get all of about a quarter-dB of difference. Not only not noticeable, but a big waste of money to be paying 3x the price. IMHO stick w/LMR 600. Unless you're a race car driver, hi hi...


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Nahh...Just an old broke up EX race car driver<img src=http://www.ezboard.com/intl/aenglish/images/emoticons/laugh.gif ALT=":lol"> Looks like 600 it is. Thanks!<hr /> Hey Peddler, There's a rumor going around about a NASCAR sanctioned short track that will be built north of Georgetown Just FYI <img src=http://www.ezboard.com/intl/aenglish/images/emoticons/wink.gif ALT=";)">


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Hot Rod Lincoln -Dancing around the World ! ...... CDX948 Central Texas, - Hook948@hotmail.com[img]http://deephousepage.com/smilies/AR15firing.gif[/img]</p>Edited by: <A HREF=http://pub86.ezboard.com/bworldwidecbradioclub.showUserPublicProfile?gid=hook948@worldwidecbradioclub>Hook948</A> at: 3/1/03 8:31:41 am
 
Hello Hook948:



The higher priced coax will save only a insiginificant amount of loss at the HF Frequencies, as compared to say LMR400.

Remember that you want 170 Ft of coax but the ratios will be right on.





Here's how it figures out: (for 100 FT of Coax)

LMR400 = .7dB loss at 30 MHz

LMR600 = .42dB loss at 30 MHz

LMR900 = .27dB loss at 30 MHz



LMR400 = .7dB = 17% loss, at 1 KW = 870 watts delivered

LMR600 = .42dB = 10% loss, at 1KW = 900 watts delivered

LMR900 = .27dB = 6.4% loss, at 1 KW =936 watts delivered



So you can see that the expensive coax will have a lower loss, but not enough to justify the nut cake expense of LMR900, and the connectors for LMR900 will be close to 100 dollars a pop.



www.texastowers.com/lmrconn.htm

www.timesmicrowave.com/te...RGuide.pdf



I use a length of LMR400 that is 160 feet long, not a problem.



I keep getting e-mail on this so I will post some of this here as a guide to all the radio enthuists out there.



dB = P1/P2 Log x 10



Example:



What is the difference in dB from 936 to 870 watts, as shown above.



dB = 936 / 870 Log x 10

dB = 1.075 Log x 10

dB = .03 x 10

dB = .3



So the difference from LMR900 to LMR400 is .3 dB



To figure dB into percentages:



dB / 10 Anti-Log



Example:



.3dB / 10 Anti-Log 1/x

.03 Anti-Log 1/x

1.071 1/x

.93 or 93 % or 7% loss



These functions for the Log operations are in base 10, and a cheap 14 dollar Caculator from Radio Shack will do the trick. I use a Texas Instruments TI-30Xa.



Jay in the Mojave



www.A1antennas.com


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I'm looking at about 170ft run to the top of mast for a 5 band (Lightning Bolt 10-20m) Quad. The LMR-600 is rated at .42dB@ 30 mhz & the LMR-900 is .27dB@ 30mhz.Will LMR-600 be OK for this or should I spend much more $ (almost 3X$ for 900)and go with the 900? About how much difference at say 1Kw would there be between the 2?


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Hot Rod Lincoln -Dancing around the World ! ...... CDX948 Central Texas, - Hook948@hotmail.com[img]http://deephousepage.com/smilies/AR15firing.gif[/img]</p>
 
Hey Hook;



From what I understand there will be 4 yes 4 new NASCAR TYPE tracks built and will run under the banner of "Texas Racing League".

They will be in

Hillsboro

Vernon

Nachadoches

and forgot the other. "CRS"



3/4 mile asphalt. I always thought dirt was for racing and asphalt was for getting there. Oh well.


The Peddler............

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A 3/4 mile would be really nice. Long enough to give you a "breather" down the straights and short enough to keep the action going. The big tracks are fun and you really know the true deffinition of PUCKER ZONE when something breaks or you screw up! Seems like it takes an hour to stop sliding<img src=http://www.ezboard.com/intl/aenglish/images/emoticons/eek.gif ALT=":eek"> <img src=http://www.ezboard.com/intl/aenglish/images/emoticons/laugh.gif ALT=":lol"> IF I can get a Dr's release and get my license back from NASCAR and IF I could round up some sponsors, I'd like to run a local 3/4 every now and then.<img src=http://www.ezboard.com/intl/aenglish/images/emoticons/wink.gif ALT=";)"> Maybe I could do a little DX'in while I'm getting dizzy and put them antennas to a REAL test <img src=http://www.ezboard.com/intl/aenglish/images/emoticons/laugh.gif ALT=":lol">


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Hot Rod Lincoln -Dancing around the World ! ...... CDX948 Central Texas, - Hook948@hotmail.com[img]http://deephousepage.com/smilies/AR15firing.gif[/img]</p>
 

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