[Amps] Choke input filters, design criteria?

[Carl]

The swinging choke from a Gates BC-1T (1000W carrier) weighs 73# and is 
rated at 16H at .1A and 5H at 1.5A. A smoothing choke was not used due to 
weight, cost and it is unnecessary.
The 30H modulation reactor from the same TX weighs 85# and only has to carry 
the DC current to the pair of 833A's in the RF deck

Those chokes plus the matching PS and modulation transformers are in use in 
one of my AM amps.

Carl
KM1H


----- Original Message ----- 
From: "Rob Atkinson" <ranchorobbo at gmail.com>
To: "Chris Wilson" <chris at chriswilson.tv>
Cc: "Amps" <amps at contesting.com>
Sent: Saturday, December 22, 2012 3:38 PM
Subject: Re: [Amps] Choke input filters, design criteria?


> That's a lot of inductance for a power supply filter choke.  The
> current rating for such a choke may be very low.  How much does it
> weigh?  a 30H 500 ma reactor should weigh in the neighborhood of 30 to
> 40 pounds.  A 10H 700 ma power supply filter choke (like what would be
> in a 1 KW AM broadcast tx) will weigh in at around 40 lbs, maybe 50.
>
>
> 73
>
> Rob
> K5UJ
>
> On Thu, Dec 20, 2012 at 3:41 PM, Chris Wilson <chris at chriswilson.tv> 
> wrote:
>>
>>
>> Well, I checked it at 115V and at 200V  and at 240V, with current
>> drawsof 13.08mA, 23.3mA and 28.09mA respectively, giving according to
>> the article, and inductance of about 27 to 28 Henry
>>
>> I also checked it with a calibrated Fluke PM6303A RCL meter, which I
>> think tests at 1kHz, and that showed 44 Henry. Assuming the articles
>> formula is good up at 1kHz the articles equation would put it at 38
>> Henry
>>
>> I will have to assume the one from the Henry Electronics 3 phase 3kV
>> supply is therefore about 27 Henry.
>>
>> Interesting stuff, thanks Rob :)
>>
>>
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