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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