Will,
Do you think that the welded laminations will not be a problem and
increase losses? Beyond that, what you're saying is good news.
73, Tony W4ZT
Will Matney wrote:
> Gerald,
>
> My guess by seriesing two will drop the flux density in each to around 10
> kilogauss as each will have 1/2 the line voltage across it. That's well below
> the bottom of the knee and in the linear region. It will raise the power
> capability X2 also, but I can't say how much without knowing the core
> dimensions. Two this way though will run as good or better than a lot of off
> the shelf linear transformers because of the low flux density. This means the
> efficiency is really high, probably 95% for a rough guess.
>
> Best,
>
> Will
>
>
> *********** REPLY SEPARATOR ***********
>
> On 3/21/06 at 2:22 PM TexasRF@aol.com wrote:
>
>> Thanks Will and John; I now have an understanding of the heating issues
>> with
>> the MOT. It appears that these transformers are really a poor choice for
>> continuous operation such as a filament power source. Two transformers
>> with the
>> primary and secondary windings series connected will work and for testing
>> the
>> traveling wave tubes is the quick method to be used.
>>
>> Many thanks for your help in my continuing education!
>>
>> 73,
>> Gerald K5GW
>>
>>
>>
>> In a message dated 3/21/2006 11:10:15 A.M. Central Standard Time,
>> craxd1@verizon.net writes:
>>
>> If you want to add turns to the primary (if there's enough room, and
>> should
>> be with the secondary removed), you can do a simple test to see how many
>> turns to add. First, use the formulas I published last week about
>> figuring the
>> core size and number of turns to find the correct number of turns for the
>> core
>> size you have. Next, connect the primary to 120 Vac and wind a 10 turn
>> coil
>> secondary. Take that secondary voltage and divide it by the 10 turns.
>> That
>> will be the turns per volt. Last, wind the extra turns you've found you
>> need by
>> the formulas and the known turns per volt. One good thing on this
>> transformer
>> in question, the primary is on the inside. If on the outside, you'd be
>> screwed on removing the secondary.
>>
>> Best,
>>
>> Will
>>
>> *********** REPLY SEPARATOR ***********
>>
>> On 3/21/06 at 11:42 AM John Popelish wrote:
>>
>>> TexasRF@aol.com wrote:
>>>
>>>> Not what I hoped to hear but I appreciate the good info!
>>> If you have a supply of this kind of landfill, you might put two
>>> similar units side by side, wire the primaries in series (effectively
>>> halving the volts per turn, so eliminating the saturation problems).
>>> Then you can knock the shunts out and wind a similar secondary on each
>>> (doubling the number of turns to compensate for the half primary
>>> voltage) and wire those two secondaries in parallel. This gives you a
>>> reasonably efficient transformer (that won't overheat without a fan)
>>> with about a kVA rating.
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