[ARC5] Fwd: Re: [MRCA] SCR-274-N receiver bandwidth spec

[J. Forster]

Thank you.

FYI, if you connected the fields in parallel and ran the machine at 12
VDC, it would run a bit below half speed, and the output voltage would be
half.

-John

==============



>> However, I would like to know if the input side of the dynamotors
>> (mainly
>> for the receivers) are Shunt or Compound wound (ie, do they have shunt
>> or
>> shunt & series fields).
>
> The receiver dynamotors have the two fields connected in series across the
> 28V input terminals. Back around 1978 I disassembled one and considered
> rewiring the fields in parallel to permit better operation at 12-14V. I
> never got around to doing it, so can't report whether 12-14V operation was
> improved or not. It would have been a very simple mod because the
> interconnecting wire was readily accessible.
>
> 73 de Neil ZL1ANM
>
>
> On Thu, Mar 27, 2014 at 5:23 AM, J. Forster <jfor at quikus.com> wrote:
>
>> Not for me, as I've little interest in retuning the sets.
>>
>> However, I would like to know if the input side of the dynamotors
>> (mainly
>> for the receivers) are Shunt or Compound wound (ie, do they have shunt
>> or
>> shunt & series fields).
>>
>> The dynamotor is actually more complez than I thought originally. It has
>> been pointed out to me that the armature and field are not independant,
>> as
>> assumed in most analyses. Rather, they are oupled by their mutual
>> inductance.
>>
>> -John
>>
>> ============
>>
>>
>> > On 26 Mar 2014 at 7:52, J. Forster wrote:
>> >
>> >> The winding data might be in the manuals somewhere?
>> >
>> > Yes. That winding data IS in at least one of the manuals, the Navy
>> one. I
>> > can
>> > dig it out if anyone seriously needs it.
>> >
>> > Ken W7EKB
>> >
>> >
>>
>>
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