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@gmail.com>
To: "Carl" <km1h@jeremy.mv.com>; <pc5m@xs4all.nl>; <Amps@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@jeremy.mv.com>
Sent: Monday, April 18, 2011 10:36 AM
To: pc5m@xs4all.nl; Amps@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@inbox.com>
To: <pc5m@xs4all.nl>; <Amps@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@xs4all.nl>
> Sent: Saturday, April 16, 2011 8:37 AM
> To: <Amps@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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>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>>
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