[AMRadio] Dummy Load


Phil LaMarche plamarc1 at verizon.net
Mon May 19 15:41:31 EDT 2008


Thank you!  I have emailed them for price and delivery and will post the
answer.

Phil 


Philip LaMarche 
LaMarche Enterprises, Inc.
www.instantgourmetspices.com 
www.w9dvm.com 
800-395-7795 pin 02 
727-944-3226 
FAX 727-937-8834 
NASFT 30210 
W9DVM 
  


-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Tom Chesek
Sent: Monday, May 19, 2008 3:27 PM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] Dummy Load

Maybe start here:

http://www.globar.com/

Tom K3TVC


----- Original Message -----
From: "Phil LaMarche" <plamarc1 at verizon.net>
To: "'Discussion of AM Radio in the Amateur Service'"
<amradio at mailman.qth.net>
Sent: Monday, May 19, 2008 2:02 PM
Subject: RE: [AMRadio] Dummy Load


>
> Can anyone advise where to purchase the Glo-Bar resistors.
>
> Phil
>
>
> Philip LaMarche
> LaMarche Enterprises, Inc.
> www.instantgourmetspices.com
> www.w9dvm.com
> 800-395-7795 pin 02
> 727-944-3226
> FAX 727-937-8834
> NASFT 30210
> W9DVM
>
>
>
> -----Original Message-----
> From: amradio-bounces at mailman.qth.net
> [mailto:amradio-bounces at mailman.qth.net] On Behalf Of D. Chester
> Sent: Monday, May 19, 2008 1:08 PM
> To: amradio at mailman.qth.net
> Subject: Re: [AMRadio] Dummy Load
>
> >>I made a mistake about 35 years ago buying some "non-inductive
> >>resistors for a dummy load. The only place they were non-inductive was
> >>at 60 Hz. The carborundums are not in the category.
> >>                                                 Joe W4AAB
>
> I use a bank of a dozen 600-ohm 150w "Glo-bar" carborundum resistors to
> achieve a 50-ohm dummy load rated 1800 watts continuous duty air-cooled.
>
> I once picked up some so-called noninductive resistors that were wirewound
> in two layers wired in parallel,  with the wire of one layer wound in
> opposite direction of the other layer.  They would not work in a dummy
load
> without a series variable capacitor to tune out the reactance. I suspect
> that type of resistor, which may be satisfactory for the AM broadcast,
might
> have substantial inductive reactance on the HF amateur bands.  With the
> capacitor, mine worked OK.  I doubt if an ordinary wirewound resistor
could
> be made to work satisfactorily, since it would behave more like an rf
choke
> than a resistor at those frequencies.
>
> Don k4kyv
>
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