[PPRAANet] Attic Antenna for 4W HT

[Steve KT0DX]

Lee just did some calculations for you and here are some numbers to look at.

RG8X  if you have a 1:1 SWR to the antenna at 146MHZZ and you feed 4 
watts to the antenna you will have 2.496 watts at the antenna.  This is 
a 38% loss

RG8X at 146MHZ  and a SWR at 1.5 will give you 2.43 watts at the 
antenna. This is a 39% loss

RG8X at 146MHZ and a SWR of 2:1 will give you 2.322 watts at the 
antenna.  This is a 43% los

RG8X at 440MHZ and a 1:1 SWR will give you 1.56 watts at the antenna.  
This is a 61% loss.

If you want to do the calculations on the use of other feed lines you 
can go to:    kv5r.com/ham-radio/coax-loss-calculator/

Recommend larger high grade coax and consider another radio other then 
HT unless you can reach the repeaters you are interested in.

Steve (KT0DX)

On 11/25/2020 18:53, Lee Davis wrote:
> Thanks for all the individual responses. Here are the details on the coax cable I was considering:
>
> High Quality RG-8X Premium Coax antenna cable
> 2) UHF PL-259 male plug-
> Great as jumpers to an antenna tuner, switch, meter or your main antenna
> 50Ω Low-loss RG8x-mini - Fully molded
> Nickel-plated connectors - Length: 50ft
>
>  From the replies, it sounds like this length should be fine to use with my 4 watt UV5R Baofeng HT without a lot of loss.
>
> Thanks,
> Lee
> KF0BOB
>
> ------ Original Message ------
>
> From: Lee Email
> To: ppraanet at mailman.qth.net
> Sent: November 25, 2020 at 9:54 AM
> Subject: Attic Antenna for 4W HT
>
> Hello, I am planning to buy an Arrow OSJ 146/440 j-pole antenna to mount inside my attic. The length of the antenna should work in my attic. My question is regarding the amount of coax cable to use. The HT is a 4 watt unit and 50' of coax would be good to have available to move the antenna to different locations if necessary. Will this length of cable work with my 4 watt HT and not cause too much loss? Thanks. Lee KF0BOB
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