[SOC] Looking to build a Dummy (Load)

[Mike Besemer (WM4B)]

http://www.1728.com/resistrs.htm

> -----Original Message-----
> From: soc-bounces at mailman.qth.net [mailto:soc-bounces at mailman.qth.net]
> On Behalf Of Carl Strode
> Sent: Thursday, January 22, 2009 9:10 PM
> To: Second Class Operators' Club
> Subject: Re: [SOC] Looking to build a Dummy (Load)
> 
> Use the formula you "learned" before you took the exam for your
> license.
> 
> Tom McCulloch wrote:
> > I'm a qrp guy and have been operating an Elecraft K2 at between 5 and
> 10
> > watts for a number of years, and have been very happy with it...Not
> wanting
> > to leave well enough alone, I got my hands on a 100 watt amp (also
> made by
> > Elecraft) and want to built a dummy load that will handle the 100
> watts.
> >
> > I see OHR makes one for about $35 +s/h but it looks likes its just a
> bunch
> > of resistors:
> >
> > http://www.ohr.com/rfl100.htm
> >
> > Here is the SOC part of my question --
> >
> > 1) I guess I can figure out the value of 20 resistors I'd need to get
> a 50
> > ohm result (well, maybe I can't.)  But what wattage should I use to
> handle
> > 100 watts?  Am I going in parallel (yea, parallel, right? otherwise
> I'd need
> > 100 watt resistors???, right?)  OK, so does that mean I'd need 20
> five watt
> > resistors in parallel?
> >
> > 2)  So what kind of resistors do I order from Mouser?  I keep reading
> that
> > wire wound resistors are not good for RF.  Also it seems carbon
> resistors
> > come in smaller wattages.  How about these ---as quoted from Mouser "
> 5W
> > Small Metal Oxide Resistors  5% Tol "  The picture in Mouser looks
> kind of
> > like the OHR picture and the price seems reasonable at $0.49 each.
> >
> > I appreciate your help and understanding with this.
> >
> > Tom
> > WB2QDG
> > SOC # (I forget)
> >
> > PS - OK, I really could use help with the value of those 20 resistors
> to get
> > them 50 ohms :)
> > tnx Tom
> >
> >
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