External Products
The following products may be of interest to radio-astronomers. They are available from the vendors sites.
John Worsnop G4BAO
A Wideband Amplifier and bias tee for 30MHz to 3GHz
The BAOWB1 is a wideband preamplifier that offers useable gain between 30MHz and 3GHz, with typically <3.5dB noise figure and >20dB gain between 30MHz and 1500MHz, falling to around 19dB gain and 4.6dB noise figure at 3GHz. While it is not designed to compete on noise figure and gain with the narrow band preamplifiers, it can make a very useful addition to a wideband receive system, or as a general purpose test amplifier.
It can be powered up the coax via the companion bias tee BAOBT1 so can be placed at the antenna. The amplifier is linear, with an output power, P1dB of +10dBm and a third order intercept of +30 dBm.
The amplifier PCB is designed to fit into a readily available 37 x 74 x 30mm tinplate box [1], and the bias tee into one 37 x 37 x 30mm [1] and can be fitted with SMA or N connectors.
Sam Jewell G4DDK
[awaiting input on low noise amplifier for 1420MHz]
[1] Schuberth tinplate boxes
Tinplate boxes for the construction kits can be obtained from Alan Melia G3NYK
