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KPA100 and KAT100 in EC2 - is replacement of L1 on AUX2 necessary?

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ktalbott

KPA100 and KAT100 in EC2 - is replacement of L1 on AUX2 necessary?

I just completed moving my KPA100 and KAT100 into the EC2 enclosure. I am
really pleased with the result! Spring is here! All I have to do is
disconnect 2 cables from my K2/10 with KAT2 and hook up the camper for QRP
fun in the woods of Virginia. Can someone advise me whether or not it is
necessary to replace L1 (the 15-mH inductor on AUX2 board)? Some posts
suggest that its current capacity is inadequate to power the digital
subsystem of the KPA100/KAT100. I do provide DC power to the K2/10 and
KAT100 through their coaxial DC connectors. Thanks!

Ken - ke4rg

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Don Wilhelm-4

Re: KPA100 and KAT100 in EC2 - is replacement of L1 on AUX2 necessary?

Ken,

Although *supposedly* the inductor should be able to supply the needed
current, I recommend replacing it with a toroid.
Especially if the inductor is of the older miniature type.
12 turns on a FT25-43 or FT37-43 core will work nicely.

73,
Don W3FPR

On 3/26/2015 1:41 AM, Kenneth Talbott wrote:

> I just completed moving my KPA100 and KAT100 into the EC2 enclosure. I am
> really pleased with the result! Spring is here! All I have to do is
> disconnect 2 cables from my K2/10 with KAT2 and hook up the camper for QRP
> fun in the woods of Virginia. Can someone advise me whether or not it is
> necessary to replace L1 (the 15-mH inductor on AUX2 board)? Some posts
> suggest that its current capacity is inadequate to power the digital
> subsystem of the KPA100/KAT100. I do provide DC power to the K2/10 and
> KAT100 through their coaxial DC connectors. Thanks!
>
> Ken - ke4rg
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

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bdenley

Re: KPA100 and KAT100 in EC2 - is replacement of L1 on AUX2 necessary?

Ken and Don:
I am interested in this as well. My KAT100 is complete in the EC-2 and I just started the KPA100 build today. I'm sure I have a few spare toroid cores around here. How do I tell if they are the ones specified by Don?

Brian
KB1VBF
Sent from my iPad

> On Mar 26, 2015, at 7:57 AM, Don Wilhelm <[hidden email]> wrote:
>
> Ken,
>
> Although *supposedly* the inductor should be able to supply the needed current, I recommend replacing it with a toroid.
> Especially if the inductor is of the older miniature type.
> 12 turns on a FT25-43 or FT37-43 core will work nicely.
>
> 73,
> Don W3FPR
>
>> On 3/26/2015 1:41 AM, Kenneth Talbott wrote:
>> I just completed moving my KPA100 and KAT100 into the EC2 enclosure. I am
>> really pleased with the result! Spring is here! All I have to do is
>> disconnect 2 cables from my K2/10 with KAT2 and hook up the camper for QRP
>> fun in the woods of Virginia. Can someone advise me whether or not it is
>> necessary to replace L1 (the 15-mH inductor on AUX2 board)? Some posts
>> suggest that its current capacity is inadequate to power the digital
>> subsystem of the KPA100/KAT100. I do provide DC power to the K2/10 and
>> KAT100 through their coaxial DC connectors. Thanks!
>>
>> Ken - ke4rg
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

Don Wilhelm-5

Re: KPA100 and KAT100 in EC2 - is replacement of L1 on AUX2 necessary?

Brian,

If the toroid cores have a painted color on them, they are *not* ferrite
cores.
The ferrite cores are a dull gray. The more common ferrite cores are
type 43 Mix, but could also be a 61 mix. The 61 mix is a lighter shade
of grey than the 43 mix.
For reference, the tiny cores used for winding the KSB2 RFC1 and RFC2
are FT25-43.
The FT designates a ferrite material,
The "25" or "37" (or any other number) is the outer diameter in inches x
100 - i.e .25 inch diameter is 25.
The number after the dash is the ferrite mixture type.

I hope that helps.

73,
Don W3FPR

On 3/26/2015 11:15 PM, Brian Denley wrote:

> Ken and Don:
> I am interested in this as well. My KAT100 is complete in the EC-2 and I just started the KPA100 build today. I'm sure I have a few spare toroid cores around here. How do I tell if they are the ones specified by Don?
>
> Brian
> KB1VBF
> Sent from my iPad
>
>> On Mar 26, 2015, at 7:57 AM, Don Wilhelm <[hidden email]> wrote:
>>
>> Ken,
>>
>> Although *supposedly* the inductor should be able to supply the needed current, I recommend replacing it with a toroid.
>> Especially if the inductor is of the older miniature type.
>> 12 turns on a FT25-43 or FT37-43 core will work nicely.
>>