Topband: Measured Loss in Copper Clad Steel RG-6 on 160 meters

donovanf at donovanf at
Wed Jan 10 14:58:27 EST 2018

I measured the difference in loss (dB per 100 ft) between solid copper 
(SC) center conductor RG-6 vs. copper clad steel (CCS) Quad-Core RG-6 coaxial cable. The difference is insignificant on 160 meters until
cable length exceeds 350 feet. You can see the affect of the steel 
core and its thin copper plating at 7 MHz and below in this table The cables were manufactured by two different companies, but the
relative loss measurements should be valid. 

A 1000 foot run of RG-6 with the more common CCS center conductor 
has 6 dB loss on 160 meters vs. 3 dB loss for the less common RG-6 
with an SC center conductor.  For most of us, the additional 3 dB 
loss in 1000 feet of CCS RG-6 will be insignificant. Solid   Copper  Cable length in
Freq   Copper  Clad    feet for a 1 dB
MHz    Loss    Loss    loss difference

1.8    0.3     0.6          350
3.5    0.4     0.6          500
7.0    0.6     0.8          500
10     0.7     0.85         650
14     0.75    0.9          650
21     0.9     1.0         1000
28     1.0     1.1         1000


----- Original Message -----

From: "Grant Saviers" <grants2 at> 
To: "Ryszard Tymkiewicz" <rtym at>, topband at 
Sent: Wednesday, January 10, 2018 4:23:34 PM 
Subject: Re: Topband: Supporting Ladder line 

The shield is always the antenna element. The coax provides the signal 
return path when the direction is set with the far end as the feed point 
of the antenna. Since you likely will have a preamp for the large 
negative gain of a RBOG, a few db more from the coax won't matter except 
for a few db gain change when switching directions. 

Here is some RG174 measured loss data (1db/100') 

Much RG6 is Copper clad steel (CCS) so how much loss it has with copper 
that might be less than 1.8MHz skin depth is an interesting question. 
Any data out there? Solid Cu RG6 would be a safer bet. There are many 
RG6 variations and ones that are flooded might the best RBOG choice. 

Grant KZ1W 

On 1/10/2018 3:50 AM, Ryszard Tymkiewicz wrote: 
> Hi Frank..I understand in the case of BOG we should use both 
> transformers T1 and T3 with 
> 4:1 impedance ratio... ? 
> I wonder if it is possible to use RG174 which unfortunately has quite 
> big attenuation even on 160m? 
> 73 Rys 
>> A reversible Beverage or BOG can be constructed out of a single run 
>> of RG-6, there's no need to form an open wire line out of two runs 
>> of RG-6, 
>> See ON4UN's Low Band DXing, Volume 5, page 7-88 and fig. 7-118 
>> 73 
>> Frank 
>> W3LPL 
> _________________ 
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