>Doesn't that 'dump power' determine one aspect of power handling
capability of the device? I believe that the hybrid's internal load
is one factor and a device could be made with external load resistor
that could be heat sinked to handle more power during the events of
great imbalance.
Al
N6TA
>
>
>---- Original Message ----
>From: k1ttt@arrl.net
>To: alwilliams@olywa.net
>Subject: Re: [TowerTalk] dump power?
>Date: Wed, 17 Nov 2004 11:38:38 -0500 (EST)
>
>>in a typical hybrid network used for dividing power and creating
>phase
>>shifts in a 4-square vertical array or many other types of arrays
>there is
>>a point in the circuit where any imbalance between the loads has to
>'go
>>somewhere'... to prevent this imbalance in loads from badly
>affecting the
>>pattern the power at this point is 'dumped' to a dummy load. if the
>array
>>is perfectly designed and matches the design impedances all around
>the
>>'dump power' is zero. this is rarely the case as when you change
>>frequency away from the design center the impedances will change and
>more
>>power gets 'dumped'. it can also be caused by other objects in the
>>vicinity that unbalance the array, or from changes in the ground
>plane
>>under vertical arrays, etc. so one measure of how good your
>4-square is
>>performing is to measure the 'dump power'.
>>
>>> I did a google search on "dump power" and got 149 hits including
>two of
>>> Tom's towertalk posting.
>>> Other hits ranged from John Deere's tractors to garbage dumps but
>at
>>> least two others indicated that it is a common term used in power
>lines
>>> and also integrated circuit power line layout.
>>>
>>> I suspect that some other Towertalkians are like me and it is an
>>> unfamiliar term. We will appreciate an explanation?
>>>
>>> k7puc
>>>
>>> _______________________________________________
>>>
>>> See: http://www.mscomputer.com for "Self Supporting Towers",
>"Wireless
>>> Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041
>with
>>> any questions and ask for Sherman, W2FLA.
>>>
>>> _______________________________________________
>>> TowerTalk mailing list
>>> TowerTalk@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/towertalk
>>>
>>
>>
>>_______________________________________________
>>
>>See: http://www.mscomputer.com for "Self Supporting Towers",
>"Wireless Weather Stations", and lot's more. Call Toll Free,
>1-800-333-9041 with any questions and ask for Sherman, W2FLA.
>>
>>_______________________________________________
>>TowerTalk mailing list
>>TowerTalk@contesting.com
>>http://lists.contesting.com/mailman/listinfo/towertalk
>>
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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