G4HUP
4 Way Distribution Amplifier Page
Home | Products |
Updates |
Kits, Prices and Ordering |
General Purpose 4 Way Distribution Amplifiers
DA1-4 Manual - including circuit descriptions, typical performance, circuit diagrams and
PCB overlays etc - click here
The DA1_4 provides a 4 way split from a RF input signal down to approx 1MHz, and is usable up to around 1.5GHz.
As supplied the kit contains no attenuator components
to configure the gain. There are five attenuator positions available within the unit:
- an input attenuator to avoid overdriving the MMICs (BGA616)
- an output attenuator for each output, enabling the gain to be set independently on each.
All attenuators are Pi types - suitable resistor values can be looked up from the table
There are no frequency shaping components in this amplifier, so it is broadband - however, it would be easy to
implement lowpass Pi filters in
place of one or more of the attenuators, using 0805 size L and C elements.
The architecture of this unit is a resistive splitter (4 way) followed by individual MMIC amplifiers.
An extra feature is the option to provide 5v/80mA power feeding from the input socket, enabling it to be used as a
GPS antenna distribution unit,
for connecting a single GPS active antenna to multiple GPS receivers. In this application the coupling capacitors
throughout are decreased in value, and the gain per channel is approx -1dB nominally.
Typical gain per output at 100MHz is 5dB nominal, and it should be noted that at higher frequencies there is some
variation in level between outputs, due to internal track lengths.
 |
 |
| DA1-4 gain comparison from 10 to 1800MHz. Mkr at 1100MHz |
Completed DA1-4 sample |
The gain measurements shown above are with 0dB attenuation configured in the module, and 0dBm nominal input level.
For the LF version, the gain at 10MHz is approx 5dB per channel, dropping to approx -1dB per channel at 1.5GHz.
All unused outputs should be terminated in 50R for correct performance.
For kit availability and price please see the Orders page.
Page created: 29.07.2008
Last updated: 31.07.2008