[Amps] RG6 Power Handling

[Carl]

----- Original Message ----- 
From: "Larry Benko" <xxw0qe at comcast.net>
To: <amps at contesting.com>
Sent: Thursday, June 19, 2014 1:53 PM
Subject: Re: [Amps] RG6 Power Handling


> Hmmmmm!  Re-reading the original post I made an assumption that may or may 
> not be correct.  I assumed the coax was to be used at the output side 
> where it would be subject to the full amplifier power. If that is the 
> case, then RG-142 or RG-400 would be about the only choices for small 
> diameter high power coax.
>
> However on the input side of the amp RG-142 would be a poor choice for 
> reasons of flexibility and cost.

** It has been used for decades by many commercial and homebrew amps.

For low power RG-174 (PE) (200W avg. @
> 30MHz) or RG-316 (Teflon) (1.1kW avg @ 30MHz) would be better.  Last time 
> I checked, RG-178 was more expensive than RG-316 even though it is 
> smaller.  I can't find power ratings for RG-178 but would guess it would 
> easily handle a couple hundred watts average since it is the same 
> construction as RG-316.

** The OP was asking about a HB amp. Surplus RG-178 is more common than 
RG-174 at hamfests and electronics surplus shops. For short runs RG-179 is 
often just as easy to find.

Carl
KM1H


>
> 73,
> Larry, W0QE
>
>
> On 6/19/2014 11:34 AM, Carl wrote:
>> Not very flexible.
>>
>> Low power circuits can use RG-174 or 178.
>>
>> Carl
>> KM1H
>>
>>
>> ----- Original Message ----- From: "Larry Benko" <xxw0qe at comcast.net>
>> To: <amps at contesting.com>
>> Sent: Thursday, June 19, 2014 12:32 PM
>> Subject: Re: [Amps] RG6 Power Handling
>>
>>
>>> RG-142 (50 ohm)
>>>
>>> Same size as RG-58 and rated at 30MHz 1:1 SWR of 3.1KW average power
>>>
>>> Larry, W0QE
>>>
>>> On 6/19/2014 10:22 AM, Manfred Mornhinweg wrote:
>>>> Hi all,
>>>>
>>>> what 50Ω coax cable would be recommended for the internal wiring of a 
>>>> compact 160-10m legal limit amplifier? I'm looking for a cable thinner 
>>>> than RG-8, much more flexible, non-foam (to avoid de-centering in 
>>>> bends), and that can be purchased easily in small quantities. Of 
>>>> course, it must handle the power, even with a slightly elevated SWR, 
>>>> without overheating.
>>>>
>>>> Suggestions are welcome!
>>>>
>>>> Manfred
>>>>
>>>>
>>>> ========================
>>>> Visit my hobby homepage!
>>>> http://ludens.cl
>>>> ========================
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>>
>
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