[TowerTalk] cables losses

[DavisRFinc]

In a message dated 98-01-27 01:39:44 EST, you write:

<< could anyone tell me the losses of rg8 and 7/8' cellflex cable.
 or any place in the web to find a table with this numbers
  >>
Hi Ernesto,  Using Belden as a reference for RG8, the loss data for their #
8237 and 9251 (uses a non-contam PVC IIA jkt) are the same, as follows.  Their
8214 is slightly lower loss at 700 mHz and above due to its foam dielectric
contributing to a higher veloc. prop. factor (78% vs. 66% for the polyeth.
dielec.).   As far as "cellflex" cable goes, their is a Cellflex Co. but in
general the cellular foam cables such as 7/8" Heliax and Cablewave run very
close in the rated losses: dB/100 ft @ MHz:
Freq:.........50.......200.....400.....900....................................
..................................
RG8:.........1.3.......2.7......4.1......7.6..................................
...................................7/8":.............28.......62........78...1
.24.......(below approx 600 mHz is < 1 dB)............
If you would like other freq's, let me know.  In about three weeks we will
have a thorough loss chart at our site:  www.davisRF.com  regards, Steve
Davis, K1PEK, DAVIS RF Co., Commercial wire/cable, RF connectors, custom cable
design. Discounts to hams.BURY-FLEX ™ low loss HF-microwave coax;FLEX-WEAVE™
aerial wire. Registered trademarks of Davis Associates, Inc.

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