[UK-CONTEST] Output power

[Rob Harrison]

Considering the lower spec RG-213 or UR67 co-ax common among many HF 
installations. You'd need 127metres of either of these at 14Mhz to get a 3dB 
loss. That's over 400feet of cable, which I'd contend is not an average 
length. Using better cable would lead to less loss and benefit on RX too.

An average run of co-ax would be 20-30 metres at most. For UR67 that equates 
to 0.7 dB at 14Mhz for the longer run of 30 metres, and just over 1dB at 
30Mhz.

Using the best co-ax you can afford benefits you on both TX and RX, and you 
won't strain the amp' in trying to get 400W at the antenna.

Bob G8HGN




----- Original Message ----- 
From: "Steve Knowles" <g3ufy at blueyonder.co.uk>
To: <uk-contest at contesting.com>
Sent: Tuesday, January 31, 2012 7:56 PM
Subject: Re: [UK-CONTEST] Output power


> Or you COULD achieve the same 640/400 result using 330 metres of RG213 at
> 2MHz!
>
> Steve  G3UFY
>
>
> ----- Original Message ----- 
> From: "Clive GM3POI" <gm3poi2 at btinternet.com>
> To: "'Bob Henderson'" <bob.5b4agn at gmail.com>; <uk-contest at contesting.com>
> Sent: Tuesday, January 31, 2012 6:44 PM
> Subject: Re: [UK-CONTEST] Output power
>
>
>> And the same of course applies to VHF and UHF only more so. 73 Clive
>> GM3POI
>>
>> -----Original Message-----
>> From: uk-contest-bounces at contesting.com
>> [mailto:uk-contest-bounces at contesting.com] On Behalf Of Bob Henderson
>> Sent: 31 January 2012 17:36
>> To: uk-contest at contesting.com
>> Subject: Re: [UK-CONTEST] Output power
>>
>> Example
>>
>> Were you feeding your 10m antenna with 100ft of RG8X, you would encounter
>> 2dB feeder loss.  To achieve 400W at your antenna feed point, 640W output
>> would be required from your Acom 1000.
>>
>> In the above scenario 640W output would be perfectly legal in the UK.
>>
>> Bob, 5B4AGN
>>
>> On 31 January 2012 08:59, Llewellyn <tony at llewellyns.freeserve.co.uk>
>> wrote:
>>
>>> Can someone please explain to me as a non HF contester how it is legal
>>> to be using  " Acom 1000 at around 600-700w from the amp. " at any
>>> time let alone during a contest.
>>>
>>> Regards
>>> Tony G8ONK
>>> _______________________________________________
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>>> UK-Contest at contesting.com
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>>>
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