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Re: [TowerTalk] Coax Comparison Chart

To: TOWERTALK@contesting.com
Subject: Re: [TowerTalk] Coax Comparison Chart
From: <donovanf@starpower.net>
Date: Wed, 2 Jul 2008 15:55:30 -0400 (EDT)
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
I received several inquiries about my old Coaxial Cable Loss Tables.

Yes, I've updated the tables several times.  My most recent update incorporates 
more accurate computations from the VK1OD on-line calculator.

http://vk1od.net/tl/tllc.php

I also added the popular LMR-400 and LMR-600 cables to the tables.

Perhaps the most important aspect of the tables is the minimum cable length 
required to obtain one dB of benefit from low loss cables.  I chose LDF4-50A 
and LDF5-50A to make the comparisons because they are high performance cables 
always available for reasonable prices on eBay, QTH.COM and many hamfests.

73
Frank
W3LPL



                CABLE ATTENUATION  (dB per 100 feet)
           
             1.8   3.6   7.1  14.2  21.2  28.4  50.1   144   440  1296

LDF7-50A     .03   .04   .06   .08   .10   .12   .16   .27   0.5   0.9
FHJ-7        .03   .05   .07   .10   .12   .15   .20   .37   0.8   1.7
LDF5-50A     .04   .06   .09   .14   .17   .19   .26   .45   0.8   1.5
FXA78-50J    .06   .08   .13   .17   .23   .27   .39   .77   1.4   2.8
3/4" CATV    .06   .08   .13   .17   .23   .26   .38   .62   1.7   3.0
LDF4-50A     .09   .13   .17   .25   .31   .36   .48   .84   1.4   2.5
RG-17        .10   .13   .18   .27   .34   .40   .50   1.3   2.5   5.0
LMR-600      .10   .15   .20   .29   .35   .41   .55   .94   1.7   3.1
SLA12-50J    .11   .15   .20   .28   .35   .42   .56   1.0   1.9   3.0
FXA12-50J    .12   .16   .22   .33   .40   .47   .65   1.2   2.1   4.0
FXA38-50J    .16   .23   .31   .45   .53   .64   .85   1.5   2.7   4.9
9913         .16   .23   .31   .45   .53   .64   .92   1.6   2.7   5.0
LMR-400      .16   .23   .32   .46   .56   .65   .87   1.5   2.7   4.7
RG-213       .25   .37   .55   .75   1.0   1.2   1.6   2.8   5.1  10.0
RG-8X        .49   .68   1.0   1.4   1.7   1.9   2.5   4.5   8.4  13.2


                     CABLE ATTENUATION (feet per dB)

             1.8   3.6   7.1  14.2  21.2  28.4  50.1   144   440  1296

LDF7-50A    3333  2500  1666  1250  1000   833   625   370   200   110
FHJ-7       2775  2080  1390  1040   833   667   520   310   165    92
LDF5-50A    2108  1490  1064   750   611   526   393   227   125    69
FXA78-50J   1666  1250   769   588   435   370   256   130    71    36
3/4" CATV   1666  1250   769   588   435   385   275   161    59    33
LDF4-50A    1145   809   579   409   333   287   215   125    70    39
RG-17       1000   769   556   370   294   250   200    77    40    20
LMR-600      973   688   492   347   283   244   182   106    59    33
SLA12-50J    909   667   500   355   285   235   175   100    53    34
FXA12-50J    834   625   455   300   250   210   150    83    48    25
FXA38-50J    625   435   320   220   190   155   115    67    37    20
9913         625   435   320   220   190   155   110    62    37    20
LMR-400      613   436   310   219   179   154   115    67    38    21
RG-213       397   279   197   137   111    95    69    38    19     9
RG-8X        257   181   128    90    74    63    47    27    14     8


              FEET REQUIRED FOR 1 DB ADVANTAGE LDF5-50A VS:

             1.8   3.6   7.1  14.2  21.2  28.4  50.1   144   440  1296

LDF4-50A    2500  1430  1250   910   715   625   475   279   158    90
RG-17       1666  1430  1110   770   560   475   420   120    60    30
FXA12-50J   1250  1000   770   525   435   355   255   120    75    40
9913         935   590   455   320   280   220   150    85    53    29


              FEET REQUIRED FOR 1 DB ADVANTAGE LDF4-50A VS:
            
             1.8   3.6   7.1  14.2  21.2  28.4  50.1   144   440  1296

RG-17         -     -     -     -     -     -     -    220    90    40
FXA12-50J     -     -   2000  1250  1100  835    625   250   145    65
9913        1430  1000   715   500   455  345    235   135    75    40
RG-213       618   434   306   212   171  146    106    58    29    14
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