They say ‘size doesn’t matter’. They were right in this case, ultra compact, ultra stable… This unit certainly packs a punch with adjustable output voltage and harmonic filtering as just some of the impressive features.
An ultra compact FM amplifier employing the latest RF techniques and a MOSFET power transistor for an ultra-stable high efficiency design.
This unit will require a power supply. You can also buy this from Broadcast Warehouse, just see the accessories on this page for the PSU needed. The 40W PSU is needed for the 20W module, while the 60W PSU is needed for the 40W module. The optional PSU has a universal input switched mode power supply. This can be used on any mains voltage system in the world. Output voltage can be adjusted and with it the RF output power of the amplifier.
A built in heatsink assembly provides more than adequate cooling to the unit ensuring 24 hour operation. On board harmonic filtering provides that needed reassurance that your signal is where it should be. The perfect no tune partner for our no tune exciters.
| Specifications |
| 20/40W min |
| =450mW min 800mW nom. 1200mW max |
| 88-108 +/- 1W at 20/40W out |
| -60dBc |
| -80dBc |
| 24 volt nominal |
| 90-270 VAC |
| 125mm x 55mm x 90mm |
| 160mm x 98mm x 40mm |
Very good product
THAI from Vietnam
I have had success using this module with the 1 Watt exciter
with a 1/4 ground plane antenna \"home made\" and my own power supply,
if using this approach make sure you test the power supply under
full load \"Dummy Load\" old heater element works; and view on a oscilloscope, the power supply needs to be made variable so as the power may be increased slowly just in case the SWR is way out, the power supply was overly designed
with a cooling fan, LM317K plus TO3 transistor, it\'s possible
to get working design from the antenna without need of an SWR
Meter using just measurements but you will need to be accurate in
your design, this was the reason for the variable supply; start testing
at 15 Volts with a separate supply for Exciter, I was not able to get
the 15 Volts from the power amplifier board, to get the noise floor
you will need 30.000 UF plus of filtering. Using a Sony receiver
I was able to measure -66 noise floor in Cool Edit with the receiver
in the next room, the best method to get great sound is \"Don\'t use
any processing, this very dangerous and requires constant monitoring
of the Deviation, or a well produced program content with known audio
peak content, it may not sound loud but it will be the best FM sounding
transmitter in your area. If you are not sure of your building ability it
may be advisable to follow B. W. advise
I hope this may be interest, and using a battery type receiver will help
in getting rid of hums and buzzing with the receiver at full output, use
An ARRL Antenna approach in your design, I only tested without
a stereo generator Roger Australia
Anonymous visitor from Australia
