http://elecraft.85.s1.nabble.com/K3-LP100A-Dummy-Load-tp7119170p7119990.html
I agree. Actually, right now I do not trust my dummy load for being close to pure resistive 50 ohms. Indeed, I did not test it at the beginning and this is what motivated me to post the question. I think I have enough to test the DL but won't have time to do it for a week or so.
> BUT just because you bought it direct from Palstar does not mean it is a
> good dummy load! The ONLY way you KNOW it is a good dummy load is for YOU to
> measure it with known good test equipment and an ohm-meter is not how it is
> done!
>
> 73 and Merry Christmas,
>
> Tom - W4BQF
>
>
> -----Original Message-----
> From:
[hidden email]
> [mailto:
[hidden email]] On Behalf Of Phil Hystad
> Sent: Thursday, December 22, 2011 3:40 PM
> To:
[hidden email]
> Cc: Elecraft List
> Subject: Re: [Elecraft] K3 + LP100A + Dummy Load
>
> The dummy load is the Palstar DL2K, full legal limit handling and I bought
> it new from Palstar several years ago. None of my operating equipment was
> purchased at hamfests -- I prefer to be the original owner and pass over any
> potential difficulties.
>
> peh
>
>
> On Dec 22, 2011, at 12:20 PM,
[hidden email] wrote:
>
>>
>> Phil,
>>
>> You don't say what type of dummy load you are using, but all of the
> cantenna
>> type have about the same SWR curve you witnessed. You will need a
> precision DL
>> to get a flat response across a large range. I have two DECIBEL DB4304B
> 100
>> watt loads here that are flat up through 2m. I don't think they are made
> any
>> more and if they were they would be very expensive. The two I have were
> bought
>> at a ham hamfest for $50 each. They are bout 6" x 4" x 4" Most of which
> is
>> cooling fins.
>>
>> Be careful when you buy dummy loads like this at a Hamfest. Take a good
>> ohm-meter with you. I bought a couple of really well made heavy duty DL's
> that
>> were rated at 300w for $100 once and when I measured them at home they
> were 75
>> ohm loads, so watch out!
>>
>> Happy holidays,
>>
>> 73,
>> Tom
>> Amateur Radio Operator N5GE
>> ARRL Lifetime Member
>> QCWA Lifetime Member
>>
>> "If somebody has a bad heart, they can plug this jack in at
>> night as they go to bed and it will monitor their heart
>> throughout the night. And the next morning, when they wake up
>> dead, there'll be a record."
>>
>> --Mark S. Fowler, FCC Chairman,
>> 1981 - 1987
>>
>>
>> On Thu, 22 Dec 2011 08:37:37 -0800, Phil Hystad <
[hidden email]> wrote:
>>
>>> Is this normal or can someone explain? I was looking at the R+iX values
> reported by the LP100A with my K3 feeding a dummy load. The SWR reported
> was always small but never super close to 1:1. Most of the SWR in this
> setup was 1.1:1 up to 1.5:1. The R values ranged from 34 ohms to up to 59
> ohms and X was ranging over a number of smallish values < 20 for all the
> bands.
>>>
>>> Is this what most of you would call normal?
>>>
>>> Does the K3 output R+iX vary from band to band (I assume so) and is that
> what I am seeing?
>>>
>>> I had thought my dummy load was mostly frequency independent so I am not
> sure if I am seeing mostly the K3 here or maybe the K3 plus the 6 feet of
> coax (RG8X) + dummy load.
>>>
>>> 73, phil, K7PEH
>>>
>>
>>
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