[Boatanchors] Choke Info Needed

[Carl]

Thats correct and typical common ratios were 5:1.   4-20, 5-25, 6-30, etc

Typically used in modulators and CW transmitters with a wide current swing.

I still use swingers in my several vintage modulator PS

Carl
KM1H



----- Original Message ----- 
From: "Gary Schafer" <garyschafer at comcast.net>
To: "'List Boatanchors'" <boatanchors at mailman.qth.net>
Sent: Thursday, October 08, 2009 9:03 PM
Subject: Re: [Boatanchors] Choke Info Needed


> You have that backwards. As current increases inductance DECREASES. A
> swinging choke will have say 20 henries with low current and around 5
> henries with high current.
>
> Also, as ripple decreases (because of inductance increase), the voltage 
> out
> decreases.
>
> 73
> Gary  K4FMX
>
>> -----Original Message-----
>> From: boatanchors-bounces at mailman.qth.net [mailto:boatanchors-
>> bounces at mailman.qth.net] On Behalf Of Price Smith
>> Sent: Thursday, October 08, 2009 6:36 PM
>> To: jfor at quik.com; Mark K3MSB
>> Cc: List Boatanchors; Kenneth D. Grimm,K4XL
>> Subject: Re: [Boatanchors] Choke Info Needed
>>
>> A swinging choke is normally used between the diode and the first filter
>> cap
>> and the smoothing choke.
>> As the current increases, the inductance increases. The inductance only
>> affects the ripple. As the ripple
>> decreases, the  effective voltage increases. Therefore with a resistive
>> load, the current will increase.
>> 73.Price W0RI
>>
>>
>>
>> > Did you measure L as a function of current through the choke? It does
>> not
>> > sound like it.
>> >
>> > -John
>> >
>> > ===============
>> >
>> >
>> >> Well,  I checked again and came up the same info.
>> >>
>> >> I was looking for a 4-12 H 300 mA swinging choke, and a friend of a
>> > friend said he had one, and I picked it up last night.
>> >>
>> >> It's about 18 ohms DC resistance,  and the inductance measures around
>> 2H
>> >> (using the bridge on my IT-28,  which isn't too bad surprisingly).
>> >>
>> >> Since inductance is inversely proportional to current in a swinging
>> > choke, I don't think what I have is a swinging choke.
>> >>
>> >> Mark K3MSB
>> >
>> >
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