[Amps] 50 Ohm Loads

[jeremy-ca]

----- Original Message ----- 
From: "Jim Brown" <jim at audiosystemsgroup.com>
To: <Amps at contesting.com>
Sent: Monday, November 12, 2007 12:35 PM
Subject: Re: [Amps] 50 Ohm Loads


> On Mon, 12 Nov 2007 12:17:29 -0500, jeremy-ca wrote:
>
>>The loads covered up to 1500 KHz or so and
>>above that the cap had to be changed.
>
> I know you said that, but I don't believe it.



Since it was used succcessfuly by a Gates installation team in the 60's that 
statement is irrelevant.


540-1700 kHz is a 3:1 range.
> In most RF systems, a dummy load needs to be pretty close to purely
> resistive. It is hard to believe that what you describe could achieve that
> over anything approaching a 3:1 frequency range with a wire wound 
> resistor.
> It certainly could be achieved, to some reasonable tolerance, over the
> bandwidth of one broadcast station.


Without knowing the actual construction of the load or resistive element I 
fail to understand how you can justify such a blanket statement.



>
>>I see no reason why an inductive resistor cant be used with reactance
>>compensation in a monoband load such as used in a 160 or 80M 4 square.
>
> Over a narrow frequency range it might be made to work.


I have a pair of 100 Ohm 50W to try and have absolutely no doubt that it 
will work very well.

Carl
KM1H



>
> 73,
>
> Jim Brown K9YC
>
>
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