On 6/3/2011 2:46 PM, Carl wrote:
>
> ----- Original Message ----- From: "Roger (sub1)"
> <sub1@rogerhalstead.com>
> To: <amps@contesting.com>
> Sent: Friday, June 03, 2011 1:49 PM
> Subject: Re: [Amps] Should a blower run after amp shutdown?
>
>
>> On 6/3/2011 8:25 AM, John G3UUT wrote:
>>> Another caution, this time about constant voltage transformers. I had
>>> one of these and tried to use it to stabilise the mains to a signal
>>> generator to improve drift. It sort of worked but the main problem
>>> with
>>> it was that it distorted the mains waveform quite badly,
>>> sufficiently so
>>> that a normal moving coil meter read very inaccurately. I'm not
>>> sure if
>>> all constant voltage transformers have this problem but some certainly
>>> do so if you want to set the filament to a particular voltage make sure
>>> you use a true RMS reading meter.
>>
>> All the ones I have experience with work that way. I think I may still
>> have one that is 750VA or maybe 1KVA. Wave form is really ratty which is
>> how they control the RMS voltage. We used them on the input to the
>> double walled calibration screen room where you'd think a pure sine wave
>> would be needed.
>>
>> 73
>>
>> Roger (K8RI)
>
>
> I use a 1KVA SOLA on the 2 PC's in the office when Im on generator
> power, all seems to run fine and it handles the sudden dips when
> inductive loads kick in. Yeah, the genny is undersized; I cant get the
> wife convinced to let me park a 20KW peak military diesel unit next to
> the house!
They make some really nice "whole house" units that will run off either
Natural or LP gas. Much more economical than gas powered ones and they
come in 15 or 20 KW with an automated transfer switch. They fire up once
a week to cycle and warm up. Only short coming is the amount of natural
gas they use. The typical 20 kw unit can be powered by the typical gas
supply, but that doesn't leave much if any gas for anything else like
heat. The power company usually gets a bit more money for running a
larger supply.
We installed a so called 9 KW portable(it has wheels) in mid 2000 after
a lot of them were returned when the Y2K scare turned out to be for
naught. Although we live within 4 miles of town, 2 miles from the city
limit, we've already passed over 200 hours on that generator in 11
years, so I'm giving serious consideration to one of the larger (and
much quieter ones)
73
Roger (K8RI)
> Carl
> KM1H
>
>
>
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