I need to purchase a dummy load for use with my K2/100. What's the
difference between a dry dummy load and an air cooled dummy load? Which is
better?
Thanks,
Mike NJ2OM
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An air-cooled dry dummy load is just fine for 100 W. I like the Oak Hills
Research RFL-100 kit. $50 and easy to build. It uses twenty 5 W resistors.
http://www.ohr.com/rfl100.htm
I wrote up my build of that kit here.
https://observer.wunderwood.org/2016/12/31/building-a-dummy-load/
If you want
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Basically the same thing. I suggest the Vectronics DL-650 (dx engineering)
or a commercial pull from Ridge Equipment. For serious testing, I fire up
my 2GHz, 6kW water-cooled dummy load--louder than 10 KPA-1500s on PCP.
Always get more capacity than you need. --because you'll need it later. If
A dry dummy load is good for up to its power rating - but do not exceed
that rating. The air cooled dummy loads not only require power for the
fan, but may be over-rated for their power spec.
I prefer dry or oil immersed dummy loads.
A good dummy load should present a 1.0 SWR for all the band
The difference between a "dry" and an "air cooled"? I think they are the
same. The difference is with "oil cooled". Heathkit used to sell a
"Cantenna" which was a dummy load in a gallon paint can. Add your own
transformer oil. IIRC it was rated for a KW for a short period.
Ken WA8JXM
On Wed,
I have a MFJ-264 which is rated for 100W more or less
continuously and 1500W for 10 seconds. It seems to work within
its specs. I've used it at up to 1KW or so.
I assume it is like most MFJ equipment, it does what it is
specified to do, but don't push it even a little bit beyond.
73 Bill AE6
Hi Mike,
Don't over-think this one. For 98% of us hams the MFJ dummy loads will work
fine.
The MFJ-260C is rated at 300 watts and sells for $50.
The MFJ-264 is rated for 1500 watts (an Ohio vendor sells it for $80) if you
think an amplifier is in your future plans.
73, Mitch
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Sent fro
I ordered the MFJ-260C. Thanks for all the replies!
Thanks,
Mike NJ2OM
> On Jul 2, 2020, at 6:44 AM, NW0M wrote:
>
> Hi Mike,
>
> Don't over-think this one. For 98% of us hams the MFJ dummy loads will work
> fine.
>
> The MFJ-260C is rated at 300 watts and sells for $50.
>
> The MFJ-264
> On Jul 2, 2020, at 3:42 AM, NW0M wrote:
>
> Don't over-think this one. For 98% of us hams the MFJ dummy loads will work
> fine.
>
> The MFJ-260C is rated at 300 watts and sells for $50.
Looking at the rating curve in the manual, that is 300 W for 30 seconds or 100
W for 90 seconds.
For $
I bought an air-cooled Bird 8201 rated 500w to 3-GHz from e-bay for
$300. It can handle 1500w for short transmissions.
73, Ed - KL7UW
http://www.kl7uw.com
Dubus-NA Business mail:
dubus...@gmail.com
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I bought a superb, almost new, almost unused Bird 8141, in its original box and
it failed after a short while. Taking it apart it was obvious that it had been
well and truly cooked. It must have been hammered. The main connection had
corroded and separated from the element. I
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