On a "sunny day" the BC-375 put out about 60 - 100 W CW or AM carrier.
The roller inductor was part of a matching network that series-tuned
the aircraft wire antennas
at the lower HF frequencies. Rated "antenna current" at these
frequencies was 3.5 - 4 A.
As a "guesstimate", the wire size used in the BC-375 roller inductor
would be able to carry about 5 A RF current at HF frequencies. Heating
due to skin effect is the primary limiting factor.
73/
Karl-Arne
SM0AOM
----Ursprungligt meddelande----
Från: sacramento.cyclist@gmail.com
Datum: 2009-02-16 06:20
Till: <amps@contesting.com>
Ärende: Re: [Amps] Roller Inductor specs
Thank you all for the replies.
I'm still curious what power level a 5 amp rated (as Karl suggests)
inductor would be appropriate to use in. A simplistic I squared R
calculation yeilds over a KW at 50 ohms, but I don't know what impact
skin effect or circulating currents have.
I also found contradictory info on the BC-375. One source says it a
600-800 watt input transmitter, but other sources suggest a much lower
power unit. I'm inclined to believe its in the 100 watt class given
its appearance.
Dennis
On Sun, Feb 15, 2009 at 11:22 AM, Karl-Arne Markström <sm0aom@telia.
com> wrote:
> This is the roller inductor from the BC-375 airborne transmitter.
>
> If memory serves me right it is about 18 uH inductance with an
approx. 5
> ampere RF current rating.
>
> 73/
>
> Karl-Arne
> SM0AOM
>
>
> ----- Original Message ----- From: "Dennis Wade"
> <sacramento.cyclist@gmail.com>
> To: <amps@contesting.com>
> Sent: Sunday, February 15, 2009 8:07 PM
> Subject: [Amps] Roller Inductor specs
>
>
>> Good morning,
>>
>> Could someone look at Ebay item 110349006314 , and tell me
>> what they might know about what piece of equipment this roller came
>> from, power level it was used at, etc. I have three of these and my
>> impression is that they are fairly common. I'm particularly curious
>> what the ratings of such an inductor might be (i.e. how big an amp
>> might it be used in.
>>
>> Thanks for the info,
>>
>> Dennis
>>
--
Dennis L. Wade
KG6ZI
Carmichael, CA
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