40 WATT FM TRANSMITTER
With selectable 15/40 watts output, PLL-PRO
3 driver and BLW60 linear power amplifier all in one enclosure,
this unit offers exceptional power output and stability at a
super low price. Despite it's high power output, this exciter
runs cool thanks to a powerful 80mm fan operated depression
cooling system. Complete 87.5 – 108 MHz coverage is obtained
and frequency set-up is simple. Thanks to the PLL-PRO
3 driver, an excellent signal to noise ratio is guaranteed,
out of lock power down is standard (and essential!) and you
are assured of the legendary NRG modulation standards. Unlike
inferior products, the PLL-PRO 40-watt unit has frequency pre-correction
in the drive to the PA stage to maintain a flat response from
87.5 to 108. It does not rely on saturating the PA to level
Spectral purity is a key feature of the performance.
The PA stage has a 4-pole low pass filter and a discrete 6-pole
low pass filter follows this. All harmonics are much better
than –50 dB down on the carrier. The improved design of the
PLL-PRO 3 driver also ensures
that any other spurious are negligible.
Ruggedness and reliability come naturally with
the PLL-PRO 40W exciter. The Philips BLW60C output transistor
has a generous 113 watts dissipation figure, which means it
can tolerate harsh operating environments. The efficient cooling
system ensures none of the 'power slump' problems associated
with high temperatures, and further enhances reliability.
When used with a high gain transmitting aerial,
a useable range of up to 15 miles can be expected, depending
on aerial height and terrain.