PA50WU VHF 70 cm
50 Вт для диапазона 70 см.
Discontinued
01 / 02 — Вид спереди
УКВ-усилитель для частот 400–480 МГц. Входной и выходной импеданс 50 Ом, малошумящий усилитель при приёме; питание 12–16 В.
- Power
- 50W
- Impedance
- 50ohm
- Weight
- 1.7kg
- Band
- 70 см
Discontinued
No longer sold. The page stays for owners: specifications and software compatibility.
Capabilities
Linear amplification
PA50WU is a 50 W power amplifier for linear amplification of RF signals on the 70 cm band.
- A Mitsubishi RA60H3847M1A-501 amplifier module is used to deliver 50 W of UHF output power.
- The amplifier uses a conventional single-ended circuit and supports all modulation modes.
No retuning required
Active broadband components eliminate the need for adjustment or tuning throughout the operating frequency range.
- Active cooling allows continuous-carrier operation for extended periods at full output power.
Operating scenarios
- 01
Long-distance contacts
For operators making long-distance contacts on the 70 cm amateur band.
- 02
Digital modes
The amplifier can operate continuously for extended periods, including in digital modes.
- 03
Vehicle installation
The compact enclosure is suitable for a vehicle installation on the 70 cm band.
Features
50 W
PA50WU provides clean signal amplification up to 50 W over the 400–480 MHz range. The amplifier can operate continuously for extended periods, including in digital modes.
1 W or 5 W input
The Pin button selects the setting for 1 W or 5 W of input power.
Compact format
The amplifier measures 185 × 165 × 83 mm including the cooling module and weighs 1.7 kg, making it suitable for DXpeditions.
Built-in LNA
The +19.5 dB low-noise amplifier is enabled with the LNA button and operates on receive. Its power is removed when switching to transmit.
Enclosure indicators
Show power, the selected input-power level and LNA mode.
LNA in practice
With the TX control input open, the amplifier is in receive mode. The LNA button enables +19.5 dB of low-noise amplification for weak received signals. The LNA is automatically powered down when switching to transmit. Additional receive-path gain applies only in receive mode. If LNA mode is selected, the LNA indicator remains lit during transmit. It shows the selected mode even while the LNA itself is unpowered.
The measurement was made with a SunSDR2PRO transceiver at 145.1 MHz in CW, with a 500 Hz receiver bandwidth and an input signal level of −110 dBm. LNA off: signal −112.2 dBm, noise −122.4 dBm LNA on: signal −93.9 dBm, noise −120.3 dBm The signal increased by 18.3 dB, while the receiver noise increased by only 2.1 dB. The signal-to-noise ratio improved by 16.2 dB: a station that was barely intelligible can now be received clearly. The improvement depends on the antenna, feed line and noise conditions at the operating location: the lower the receiver's own noise, the less an external preamplifier will contribute. These figures are the result of a specific measurement, not a guaranteed specification.
Amplifier control
FWD indicates RF power transmission.
REF indicates an SWR above 3:1.
Pin selects an input level of 1 W or 5 W.
LNA enables the +19.5 dB receive preamplifier; an open TX control input corresponds to receive mode.
On transmit, LNA power is removed, but the LNA indicator continues to show the selected mode.
PWR switches the amplifier on. When it is off, ANT and RADIO are connected directly.
ANT connects a 50-ohm antenna.
+12V connects a 12–16 V, 16 A power supply.
TX accepts the external transmit-control signal.
RADIO connects a transceiver with a 50-ohm output.
SpecificationsPA50WU VHF 70 cm
Specifications
| Amplifier control connector type | RCA |
|---|---|
| Frequency coverage | 400...480 MHz |
| Input/output impedance | 50 ohm |
| Input signal amplifier in receive mode | +19,5 dB |
| Nominal output power | 50 W |
| Power connector type | Anderson Power Pole |
See all specifications for details