My experience with the MOT is that it does not deliver a constant
voltage. In fact, quite the opposite. There is quite a bit of voltage
drop with load in the supply I built.
I agree with the earlier comments regarding FWCT vs FWB with two
transformers. You can get more current out of two with a FWB and the
secondaries in parallel but, with MOTs, you must be sure that they are
identical so you have the same voltage from each. It's still possible to
use a pair that aren't exactly the same by using TWO full wave bridges
with one filter capacitor bank but that's a lot of trouble to go through.
While I might consider using one or two MOTs for a fun little amp with a
single GI-7B in a real little box, I doubt I would use them for anything
serious unless I had no other option. They still run hot with no load,
even with the magnetic shunts removed and that's not fun. That is unless
you key the high voltage on each time you transmit. Not exactly the most
desirable thing to do but it WOULD work if you were pinched for parts
and watts.
73, Tony W4ZT
KD7QAE wrote:
> correct.
>
> Bill Turner wrote:
>
>> ORIGINAL MESSAGE:
>>
>> At 07:07 PM 3/15/2006, KD7QAE wrote:
>>
>>
>>
>>> Ferroresonant transformers
>>> will run quite hot as the core losses are 2 to 4x per pound those of
>>> high quality linear transformers but they do the one thing that no
>>> linear transformer can do, deliver a constant voltage with no active
>>> devices.
>>>
>>>
>> *********** REPLY SEPARATOR ***********
>>
>> If I remember correctly, they also do a crude form of current
>> limiting too, don't they? In case of a short circuit or an overload
>> they won't try to dump the entire output of Hoover Dam into your cooking
>> space.
>>
>> 73, Bill W6WRT
>>
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>>
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|