DBA-1000 Dual Band Masthead Preamplifier for 50 / 70

  • Dual band masthead preamplifier
  • 50-52MHz and 60-71MHz.
  • 1dB NF on both bands
  • excellent steep bandpass filtering
  • 250W pep / 100W FM power handling

Price excl VAT: £265.83
incl VAT: £319.00


The DBA1000 is a low noise preamp covering 6m and 4m Band. It has a built-in Diplexer only
one Coax connection in and out is needed.

Power can been provided by an external supply or Bias T feed up the coax that is switched from the shack.

The DBA 1000 from SSB-Electronic is a low-noise and large-signal-proof mast preamplifier. It is used to improve the reception properties of amateur radio stations in the 6m and 4m band. It is particularly suitable for dual band antennas 4m + 6m with only one feed line. In order to avoid mutual interference with signals from the two frequency ranges, the DBA 1000 is constructed with separate amplifier stages, which are connected together with diplexer circuits at the input and output of the device. Due to the already built-in diplexer, only one RF socket is required for connecting the (combination) antenna and the derivation cable. The preamplifier is equipped with a transmit and receive switch.

The automatic transmit / receive switchover (VOX) switches the amplifier off when transmitting and on again when receiving. The maximum switchable power is 100 watts. In the case of higher outputs, the amplifier is controlled and supplied with voltage using a sequencer. When using a sequence control, the maximum transmittable transmission power is 750 W PEP and 750 W with CW / FM / WSJT. This amplifier can be supplied with supply voltage remotely via the coaxial cable through its output. Alternatively, local power supply can be provided via the UHF socket with a separate line. When using the VOX switching, this amplifier must have a permanent power supply during operation. It can be supplied locally or remotely. The input and output of this amplifier are secured with amplitude limiters to ensure a high level of operational reliability.

The input and output circuits of the amplifier are dimensioned in such a way that both connections have an exact 50 ohm impedance with very low imaginary components. This ensures that the antenna system is loaded with real 50 ohms and that the parameters of the system are not changed. With the currently mostly used highly optimized narrowband antennas it is very important that they are terminated with real 50 ohms. A mismatch at the input of the preamplifier used can lead to a change in the parameters of such antennas, causing loss of profit and influencing the directional characteristic.

The amp
This amplifier is equipped with a UV-resistant, weatherproof housing and N sockets. Hot-dip galvanized clamps and assembly material made of stainless steel are included.

Technical data DBA 1000

Frequency range:
50-52 MHz / 69-71 MHz
Noise figure typ. @ 20°C:
1,0 dB / 6m
1,0 dB / 4m
18 dB / 6m
17 dB / 4m
22 dBm / 6m
23 dBm / 4m
Max. switching power with HF VOX:
100 W CW, FM, WSJT, FT8
Transferable power with the use
of a sequencer:
750 W CW, FM, WSJT, FT8
Insertion loss TX:
0,04 dB
Current consumption typ.:
220 mA
Operating voltage: 12 V – 14 V
Connector: N socket
Mast diameter:
max. 58 mm