In case anyone cares about the actual value of the 160m add-on toroid as
shipped by RF Concepts:
Measured at 1 kHz with an impedance bridge: 33.97 uH
Measured at 1.9 mHz with a scalar analyzer: 33.8 uH
I suspect 40 uH would be a good target. I haven't gotten around to
winding one on a stack of T-225's yet, but I have gotten as far as
gathering all the materials. Too Darned Busy.
73,
Jim N7CXI
On 6/19/2012 1:28 PM, Carl wrote:
> I can get it locally around .30/ft plus gas(-;
> Or just call ESS at 603-624-9600 or email peter@esssurplus.com
>
> Ive still plenty of T-225's on hand.
>
> Carl
> KM1H
>
>
> ----- Original Message ----- From: "Jim Barber" <audioguy@q.com>
> To: "Carl" <km1h@jeremy.mv.com>
> Cc: <amps@contesting.com>
> Sent: Tuesday, June 19, 2012 3:24 PM
> Subject: Re: [Amps] Alpha PA77 vs 77Dx plate choke?
>
>
>> If I can find those T225-2's I bought from you I'll build and test
>> one that way. Good idea.
>> I need to order some of that tubing, though. Amidon?
>>
>> 73,
>> Jim, N7CXI
>>
>> On 6/19/2012 6:54 AM, Carl wrote:
>>> Id question the 3 toroids especially if generating serious power on
>>> 160.
>>>
>>> A pair of T200-2A's or even T225-2A's would run cooler.
>>>
>>> High temp magnet wire thru Teflon tubing dramatically improves the
>>> breakdown
>>> safety factor.
>>>
>>> Carl
>>> KM1H
>>>
>>>
>>> ----- Original Message -----
>>> From: "Paul Christensen" <w9ac@arrl.net>
>>> To: <amps@contesting.com>
>>> Sent: Tuesday, June 19, 2012 9:15 AM
>>> Subject: Re: [Amps] Alpha PA77 vs 77Dx plate choke?
>>>
>>>
>>>>> "The toroid is (3) T200-2 iron-powder cores glued together,
>>>>> wrapped with
>>>>> glass tape..."
>>>>
>>>> ETO used 3M #27 glass tape. Still widely available.
>>>>
>>>> http://tinyurl.com/ceu967w
>>>>
>>>> Paul, W9AC
>>>>
>>>>
>>>>
>>>>
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>>>>
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>>>
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>>
>>
>>
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>
>
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