Quote from Mclean Engineering (blower) catalog:
"for 50 Hz operation where the blower speed and air output is reduced by
approximately 16%".
Also, cheap transformers definitely use less iron, and smaller guage wire.
And run hotter. Insulation is cheaper (compared to iron and copper), so
they often use high temp insulation, for core temperatures that can be as
high as 200 deg C. This assumes a given line frequency. Units made for
50/60 Hz have more iron, definitely. If you get a single 60 Hz spec, then
watch out when running at 50 Hz. The filter is also
closer to the design margins also, as a particular low pass may be
calculated for 120 Hz, and now has to work adequately at 100 Hz. Resonant
choke input supplies MUST have the choke resonant for the correct line
frequency. All of these things point to having a transmitter or amplifier
which is designed for 50 Hz, and temperature tested at 50 Hz at full power.
Years ago, I designed some FM broadcast transmitter to be sold to Portugal;
they had to run on 380 Volt Wye connection, 50 Hz. We rented a special
diesel generator and wired it into the building and test bay. The TX passed
the 24 hour heat run, but some of the buttons on the exciter jammed due to
heat. I would like to suggest than any ethical manufacturer who values long
term reputation would do this.
K5PRO
John
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