[Elecraft] Need to select a dummy load for K3 TX calibration...(advice?)

[Tom Hammond]

FWIW - Last time I spoke with the folks at Ridge Equipt., they had 'a few'
100W-150W loads available as well as those shown on their web page...
apparently not enough to make it worth reworking the web page to show them
however.

You might want to give them a phone call and see what they might have that's
not shown on the web site.... 410 549-7661.

Those they show on the site are GREAT and well worth the $$. Though they will
'handle' short periods of overload, I'd not do so for very long at all.  They
are 'rated' for 100% duty cycle at something BELOW the 'advertised' power
levels... e.g. the "75W" dummy load is more conservatively rated (elsewhere)
at 65W, and, after having looked inside the load (I have one) I'd not want
to push my luck too far by exceeding 65W for too long a time.  They're good,
but they're NOT SUPERMAN!

73,

Tom   N0SS


At 11:22 02/24/2010, Don Nelson wrote:
>On 2/24/2010 9:41 AM, Brett Howard wrote:
> > If you're in a hurry you've already bought the MFJ from HRO.  If you
> > want to be a little more frugal you can get an adequate one here for 12
> > bucks!
> >
> > I know it says its a 75watt load but it will do 100 for long enough to
> > get the job done and the K3 only calibrates at 50 any way...
> >
> > https://www.ridgeequipment.com/store/dummyloads.html
> >
> > ~Brett
> >
> > On Tue, 2010-02-23 at 10:13 -0800, Jeff Hall, W6EZY wrote:
> >
> >> Hello all,
> >>
> >> I need help picking out a proper dummy load to use for calibrating my new
> >> K3.  HRO is just up the road and they carry some of the less expensive MFJ
> >> dummy loads -- would these be sufficient? Not looking to spend a lot of
> >> money, but don't want to buy junk either.  What factors should I consider?
> >> I'm assuming oil-cooled dummy loads are more robust, while 
> air-cooled loads
> >> are more compact, but you have to be more careful when operating 
> or they can
> >> burn up more easily.  The K3 manual says this is just a 5W test 
> and I need a
> >> load with low VSWR from 160 to 6.  What is considered "low" SWR? Anything
> >> under 1:5?
> >>
> >> If I can get by with the MFJ-260 for just $40, that sounds 
> reasonable to me.
> >>
> >> 73 de Jeff, W6EZY
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> >
>The same seller is selling this dummy load for less on ebay and the
>shipping is less via ebay.
>
>http://cgi.ebay.com/50-Ohm-Dummy-Load-75-Watts-VERY-NICE-1973_W0QQitemZ250584212024QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3a57fba238
>
>Don, N0YE
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