[GreenKeys] Navy radio question...

[Andreas Müller]

Hi and thank you all for your hints concerning 3-phase power supplies. But 
that is not my problem, because I have 400V 50Hz 3P available (and I am told 
that the URT-23 works with that also). My problem is that I have no 
possibility to erect an appropriate antenna, so am in need of something 
smaller than my URT-23 which is not intended for everyday use anyway (too 
noisy...). That's the reason why I am looking for the missing parts to 
complete a WRC-1. So I would be interested in the AM-3007 and the coupler 
CU-937. But the most interesting thing is that there is a junction box. If 
anybody has a manual of the WRC-1, I would appreciate if I could get a scan 
of the pages concerning this box or the inter-unit cabling.
73 de Andreas, DD1LM

Am Sonntag, 8. Januar 2006 17:32 schrieben Sie:
> On Sun, 8 Jan 2006, roy.morgan at nist.gov wrote:
> > Quoting Andreas Müller <dd1lm at t-online.de>:
> >> ... power supplies for the URT-23... PP-3916 and is made for 440V, 60Hz,
> >> 3P....
> >
> > There is another one which has double size and as far as I know is made
> > for 1P power.
> >
> > Andreas,
> >
> >
> > A fourth way is, as you might guess, solid state power inverters. It
> > appears that one company has a patent on this technology and so has had
> > no competition in supplying systems to do the job.  Now, it appears, a
> > contender has developed
>
>    Depending on The Budget - I would also offer that there is no lack of
> 3-phase variable-speed motor controllers, available from every industrial
> electrical supplier, and made by many companies - such as ASEA/BB, GE,
> Allis-Chalmers, Minarik, etc etc.
>
>    I have used these extensively in connection with motors having
> permanent-magnet rotors and three-phase stators for very 'smooth' control
> of movie projectors - up to 5 HP (3.7KW) size. But you can get them for
> any output, and many will take (at these power levels) 220/440 single
> phase and output 3-phase, using digital waveform synthesis, and power
> amplifiers - much like a switching supply.
>
>    For a fixed radio equipment power supply, the simplest, cheapest
> controller would more than suffice, and it's parameters left at one output
> voltage and frequency. One advantage to this scheme is that 'soft start'
> (voltage ramp) is easily obtained through the setting of a single
> parameter with no extra hardware needed.
>
>
>    Just my 200 millidollar...
>
>
> Cheers
>
> John   KB6SCO