LMR-100 vs RG316 | Product Knockout

“Our Product Knock-out series is a match-up between two similar products. In boxing terms, think same weight class, same caliber, and same level of experience and amount of exposure. The purpose of these posts are for you to see a side-by-side view of two similar products, and to be able to understand which one will be crowned champ for your specific purposes. Take your seats and prepare for battle, because the gloves are coming out.”

LMR 100 and RG316 have some similarities and some differences. This product knockout post is going to examine the characteristics of LMR-100 vs RG316 cable. The two will then be compared and contrasted. Let’s take a closer look at these two cables.

What is LMR 100 Cable?

LMR 100 is a flexible, low loss, communication cable. This cable is ideal in applications such as short antenna feeder runs and jumper assemblies that are mostly in wireless communication systems. LMR 100 can also be used in applications that require easily routed, low-loss cable such as WLL, GPS, WLAN, etc. This cable features a flexible outer conductor which allows the tightest bend radius of any cable that is similar is size and performance. It also boasts the lowest loss of any flexible cable. LMR cable may be used as a drop in replacement for RG 316 or RG 174 cable.

What is RG 316 Cable?

RG 316 is a coax, military rated, communication cable. This cable can be used in applications such as military equipment, direct burial, transmission of radio frequency signals, and telecommunications. It can also be used for high frequency interconnections between PCB in telecommunications equipment. RG-316 is also an ideal choice for applications that require high performance and stability in high temperature environments or in applications that have minimal installation space.  RG316 coax is also a low loss cable. Due to the large size of its conductor, the attenuation of RG316 is lower than other options in this category. This cable is also in accordance with MIL-DTL-17 specifications. This part is M17/113-RG316.

LMR 100 vs RG316 Cable

LMR 100 cable and RG 316 cable have some similarities and some differences. The cables are also both coaxial cables used in communications/telecommunications applications. They both have an impedance of 50 ohms. Below is a chart that compares the similarity of low loss/attenuation characteristics. As the chart shows, the low loss is comparable at a variety of different frequencies, but the LMR-100 cable performs slightly better. Both of these cables have low loss, or attenuation characteristics.

LMR-100 Loss (Attenuation dB/100ft) RG316 Loss (Attenuation dB/100ft)
30 MHz 3.9 4.3
50 MHz 5.1 5.6
1500 MHz 30.1 32

As the chart shows below these cables are constructed differently. LMR-100 has a conductor that is solid bare copper clad steel, where RG316 has a stranded silver covered copper clad steel conductor. RG-316 having a stranded conductor, makes it more flexible than the solid conductor of LMR-100. Another major difference one can see from the chart is that RG316 has a higher temperature rating. The higher temperature rating is made possible by the jacket type of RG-316 coax which is Fluorinated Ethylene Copper (FEP). This allows the cable to be used in specific applications that require that higher temperature environment in comparison to the LMR-100.

lmr-100, rg316, rg-316, lmr-100 cable

LMR-100 vs RG316

LMR-100 vs RG316 Specs for Construction
LMR-100 RG316
Conductor Type Solid Bare Copper Clad Steel Stranded Silver Covered Copper Clad Steel
Dielectric Material Solid Polyethylene (PE) Solid Polytetrafluoroethylene (PTFE)
Outer Conductor Aluminum Tape Silver Covered Copper Braid
Jacket PVC or FRPE Fluorinated Ethylene Copper (FEP)
Temperature -40°C to +85°C -55°C to + 200°C

Although LMR 100 can be used as a drop in replacement for RG 316, it does not have a mil-spec call out. This is another major difference when we compare LMR 100 vs RG316. RG 316 coax has a military call out, M17/113-RG316.

Winner by unanimous vote? Instead, it seems as if the match has ended in a technical decision.
In this case it looks like our crowned champ depends on your specific application use.

If you’re unsure about what cable you’ll need in order to meet the needs of your application, consult with one of Allied’s knowledgeable sales reps by submitting an RFQ. Visit our website to learn more about LMR 100 Cable or RG-316 Cable.

RG178 vs RG316 | Product Knockout

Product_KnockoutOur Product Knock-out series is a match-up between two similar products. In boxing terms, think same weight class, same caliber, and same level of experience and amount of exposure. The purpose of these posts are for you to see a side-by-side view of two similar products, and understand which one will be crowned champ for your specific purposes. Take your seats and prepare for battle, because the gloves are coming out.

RG178 and RG316 are high temperature, high performance coaxial cables. These cables are manufactured in accordance with the MIL-DTL-17 specs, and are designed for use in high temperature applications, among many others. RG178 coax cable and RG316 coax cable can be used in radio frequency applications, wireless communication, broadcast equipment, and in direct burial. These cables are very similar, but what sets them apart? Let’s find out.

RG178 vs RG316 Specs for Construction
RG178 RG316
Conductor Type Stranded (7/.004) Stranded (7/.0067)
Conductor Diameter 0.012” 0.020”
Conductor Material Silver-coated Copper Clad Steel Silver-coated Copper Clad Steel
Dielectric Diameter 0.033” 0.060”
Dielectric Material PTFE PTFE
Shield/Outer Conductor Silver Plated Copper Braid Silver Plated Copper Braid
Jacket FEP FEP
Overall Diameter 0.071” 0.098”
Weight (lbs/mft) 6.3 9.89

Both RG178 and RG316 feature stranded, silver-coated copper clad steel conductors, the same PTFE dielectric material, the same silver plated copper braid shield, and the same FEP jacket.

So, what stands out the most in the construction of these two cables? The size.

The size of these cables vary right from the center of each cable, starting with the conductor diameters. Having a larger conductor also contributes to the weight of the cable.

From the numbers in the table, you can see that RG-316 is almost double the size of RG-178, especially when comparing the dielectric diameter of both cables.

RG178 vs RG316 Electrical Specs
RG178 RG316
Min. Temperature Rating -55°C -55°C
Max. Temperature Rating 200°C 200°C
Max. Voltage 1000 900
Impedance (ohms) 50 +/-2 50
Capacitance (pF/ft) 29.4 32

The electrical specs between RG 178 coax and RG 316 coax are fairly similar. They both have the same minimum and maximum temperature ratings, similar impedance, but they vary slightly in voltage rating and capacitance.

RG178 Loss (Attenuation dB/100ft) RG316 Loss (Attenuation dB/100ft)
Typical Attenuation Max. Attenuation Typical Attenuation Max. Attenuation
100 MHz 14.7 16.0 7.8 11.0
400 MHz 30.2 33.0 16.0 21.0
1 GHz 48.9 52.0 26.3 38.0
2.4 GHz 78.7 83.3 43.0 55.4

Because RG178 and RG316 both have silver-coated copper clad steel conductors, the difference in attenuation between the cables cannot be blamed on conductor material. In fact, these cables are so similar that it may be surprising that RG178 experiences almost twice as much attenuation as RG316.

In this case, it comes down to conductor size. RG 178 is smaller than RG 316, and it experiences more loss because of its size. RG 316 has less loss because the conductor is larger. Typically, the larger the conductor, the less loss a cable experiences.

RG178 vs RG316 Cable

RG178 vs RG316 Cable

Winner by unanimous vote? Instead, it seems as if the match has ended in a technical decision. In this case it looks like our crowned champ depends on your specific application use.

If you are unsure about what coaxial cable you’ll need in order to meet the needs of your application, consult with a qualified engineer or with one of Allied’s knowledgeable sales reps. To learn more about RG178 and RG316 visit the coaxial cable main product page.

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