[SI-LIST] Re: RF cable standards

Diyanesh:

RG designations are JAN  (the AN refers to (US) Army Navy, and they refer back 
to MIL-HDBK-216 and MIL-C-17).  They are  analagous to RG-XXX (or EIA's WR-XXX) 
sizes for waveguides.  I'm not sure how numbering works (on Waveguides, it's 
based on dimensions).

I couldn't find RG-174 in my old reference (Reference Data for Radio 
Engineers), 

but here is description of RG-178B/U:

High Temperature, Single Braid
Inner Conductor  7 X 0.004" silvered copper-covered steel
Dielectric Material  Teflon
Nominal Diameter of Dielectric  0.034"
Shielding Braid  Silvered Copper
Protective Covering  Fluorinated ethylene propylene
Nominal Overall Diameter 0.075" max.
Nominal Capacitance  29.0 pF/ft
Maximum Operating Voltage  1000 Vrms
Z=50 ohms

On web I found for one brand:

RG-174 is also 50 ohms
0.018" inner conductor  (7 X 0.0063")
0.060" dielectric (Teflon)
0.084" shield braid
0.11"  overall diameter
30.8 pF/ft

Looks like they should be fairly similar, but different dimensions which may be 
important in terminating them with connectors.  Looks like they are both rated 
to 3 GHz and from what I could see, similar in losses.

You'd do best to go to your cable vendors and compare spec's side-by-side, as 
I'm not sure these numbers are representative of all cable vendors, but I'm 
sure the dimensions are dictated by the MIL documents.

-----Original Message-----
From: Diyanesh Babu [mailto:cvdbabu@xxxxxxxx]
Sent: Friday, May 30, 2003 6:55 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] RF cable standards


Hi experts,

Could anyone tell me what are RG178 & RG174 standards in RF cables ? Can
we use RG174 RF cable alternate to RG178? 

Thanks in advance. 

Regards,
Diyanesh Babu C. V.  
Engineer R&D
HCL Peripherals
Vadapalani
Chennai-26
TamilNadu
India

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