[Boatanchors] 3-phase for BA transmitters?

[Charles Ring]

1000 watt output AM broadcast transmitters have used single phase 
220/240VAC "forever", maybe all the way back to the beginning, so I am 
surprised to see the replies i am getting. Thanks to all.

73 de W3NU



On 11/18/2012 1808, J. Forster wrote:
> There are very good reasons for using 3 phase.
>
> Mostly, the power supply requires less energy storage in the filters,
> because unfiltered 3 phase has only about 4% ripple, hence smallere
> capacitors.
>
> Also, if a B+ fault happens, there is less energy to dump into an arc.
>
> -John
>
> ================
>
>> Hi Charles - Good question - I've got a 1950's vintage Navy
>> transmitter AN/URT-3 that runs a 4-400 final at 100w output on 115v
>> 1-phase - the 500w "booster" section (bigger p/s & modulator) requires
>> 230v 3-phase. There are several other miitary surplus transmitters
>> (500-1000w) that require 230v 3-ph for the high-power sections. Yeah,
>> I could replace the HV supply but I really like keeping these things
>> original if possible.
>> cheers,
>> Nick K4NYW
>> www.navy-radio.com
>>
>> On Sun, Nov 18, 2012 at 5:13 PM, Charles Ring <w3nu at roadrunner.com> wrote:
>>> What is there, useful to hams, that requires 3 phase power?
>>>
>>> 73 de W3NU