[Amps] wirewound resistor inductance/capacitance parameters

[Carl]

Dentron used an encased 50 Ohm in the MLA-2500 160-10M, dont have mine apart 
to find a name.

Carl
KM1H


----- Original Message ----- 
From: "Shane Youhouse" <kd6vxi at gmail.com>
To: <pc5m at xs4all.nl>; <Amps at contesting.com>
Sent: Monday, April 18, 2011 2:29 PM
Subject: Re: [Amps] wirewound resistor inductance/capacitance parameters


>I just checked a Dale old school 'sand' wirewound, swept from 1.79 to 4.33.
>
> 100 ohms, 3 watts.  R ranged from  100 to  102.   X from 12 to 13.  Swr 
> was 2.1 to 2.0, all readings from lo to high vs freq.
>
> Next I tried a gold colored encased power resistor w two bolt holes, at 
> olpposite ends.
>
> At 1.7625, R=5, X=0, swr = 8.8
> At 4.3305, R=7, X=9, swr = 9.1
>
> Marked 8 ohms, 5 percent, 25 watt.
>
> Didnt have the values you NEEDED, but it would seem that at 1.8-2, 6 or 7 
> of these aluminum encased style would work.
>
> Transistors have ratings, tubes have guidelines!
>
> --Shane
> Kilowatt Delta Six Victor Xray India
>
> -----Original Message-----
> From: pc5m, Carel <pc5m at xs4all.nl>
> Sent: Monday, April 18, 2011 02:15 AM
> To: Amps at contesting.com
> Subject: Re: [Amps] wirewound resistor inductance/capacitance parameters
>
>
>
> Jim, thanks for your reply, however my goal is to see what can be
> done with those low cost chassis mount resistors. The non-inductive
> one's (or special thickfilm resistor) are much more expensive....
>
> So,
> I was hoping that someone had taken some data for those low cost ones?
> In the meantime I did take some crude RF measurements and two 100 Ohm
> 50W resistors in parallel gave a 1:1.2 SWR (-20dB RL) at 2 MHz. That is
> encouraging...but before I order a massive amount I would like to limit
> the risk a bit more...
>
> 73's Carel.
>
> On Sun, 17 Apr 2011 18:14:31
> -0700, Jim W7RY wrote:
>
>> There are LOTS of non inductive resistors out
> there (thick film etc)!
>> Consult the Mouser catalog. Download a Mouser
> catalog at
>>
>> www.mouser.com [6]
>> 73
>> Jim W7RY
>>
>>
> --------------------------------------------------
>> From: "pc5m, Carel"
>
>> Sent: Saturday, April 16, 2011 8:37 AM
>> To:
>> Subject: [Amps]
> wirewound resistor inductance/capacitance parameters
>>
>>> Hi, Was
> wondering if someone had some RF data (inductance/capacitance, or even
> better a spice model..) of the general available low cost aluminum
> housed high power (e.g. 50W) resistors for chassis mount? Example are
> the Vishay NH series ( http://www.vishay.com/docs/30201/30201.pdf [2])
> but also Welwyn and Ohmite run comparable products. Goal would be to
> construct some high-power (kW's) dummy oad for 160mtrs (so only
> reasonable well reflectionloss needed till 2 MHz..). Did google a bit
> but didn't found anything useful. Thanks in advance, Carel
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>
> Links:
> ------
> [1] http://www.vishay.com/docs/30201/30201.pdf
> [2]
> http://www.vishay.com/docs/30201/30201.pdf
> [3]
> mailto:Amps at contesting.com
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