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SPS (separate power sources) [TS-480HX only]
SPS is shorthand for “operating at 200W using two 100W 13.8V power sources.” To generate a
200W output from 13.8V requires a maximum (total) current of 41A. As previously explained, the
TS-480HX employs a pair of 100W final amps. What the SPS design does is to supply these
amps from two separate power supplies, as shown in Fig. 3 below.
The use of two power supplies may appear inconvenient, but in actual fact this arrangement is
quite practical. Many customers already possess a 100W class power supply, so when they
acquire this 200W transceiver they do not have to make an additional purchase of a new 200W
class power supply. It is possible for them to make use of the 100W unit in their possession.
The PS-53 power supply is specified for the TS-480; however, as long as it can produce 20.5A or
more continuously at 13.8V, other power supplies can be used. Also, it is possible to operate this
transceiver using a single power supply that can produce at least 41A continuously; note, however,
that two power cables would still be needed.
Fig. 3: SPS schematic diagram
Other circuits
DC power
supply 1
(13.8V, ≥20.5A)
DC power
supply 2
(13.8V, ≥20.5A)
Final am
p
1
Final amp 2
Drive amp
DC1 connector
DC2 connector
Chassis