[Amps] wirewound resistor inductance/capacitance parameters

[Carl]

I have 300W incandescents in the garage that came from a local HS stadium 
that was upgraded maybe 25 years ago and another guy grabbed and stashed 
them; complete with sockets. They are great for cancelling shadows from the 
flourescent tubes which are the primary lights. I only need them at certain 
times.

Carl
KM1H


----- Original Message ----- 
From: "Shane Youhouse" <kd6vxi at gmail.com>
To: "Carl" <km1h at jeremy.mv.com>; <pc5m at xs4all.nl>; <Amps at contesting.com>
Sent: Monday, April 18, 2011 2:18 PM
Subject: RE: [Amps] wirewound resistor inductance/capacitance parameters


Dunno about that, Carl, the Halides and Sodiums have an arc tube in them 
that, IIRC, is designed to fire at app 600 volts.

It's not just a piece of wire in them..

I HAVE seen 250 and 300 watt incandescents at lighting supply stores.  Those 
would be ideal.  The arc-tube lights common in roof installations of 
wharehouses (1 Kw) and stadiums (1500 watt) are not a constant impedance, 
and are very high impedance (I just measured a cold 400 HPS replacement for 
the outdoor light going back up today, and it wont measure on my DMM...  It 
measures to at least 50 Mohms).


--Shane
KD6VXI

Transistors have ratings, tubes have guidelines!


-----Original Message-----
From: Carl <km1h at jeremy.mv.com>
Sent: Monday, April 18, 2011 10:36 AM
To: pc5m at xs4all.nl; Amps at contesting.com
Subject: Re: [Amps] wirewound resistor inductance/capacitance parameters

For 160 you can probably do that with a couple of warehouse/stadium wattage
lightbulbs. Measure the reactance and add the opposite sign to cancel.

Carl
KM1H


----- Original Message ----- 
From: "Jim W7RY" <w7ry at inbox.com>
To: <pc5m at xs4all.nl>; <Amps at contesting.com>
Sent: Sunday, April 17, 2011 9:14 PM
Subject: Re: [Amps] wirewound resistor inductance/capacitance parameters


> There are LOTS of non inductive resistors out there (thick film etc)!
> Consult the Mouser catalog.  Download a Mouser catalog at
>
> www.mouser.com
> 73
> Jim W7RY
>
>
> --------------------------------------------------
> From: "pc5m, Carel" <pc5m at xs4all.nl>
> Sent: Saturday, April 16, 2011 8:37 AM
> To: <Amps at contesting.com>
> 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>
>> http://www.vishay.com/docs/30201/30201.pdf) 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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