out of production
Front-end PCB (click to enlarge)
To built a receiver for UHF and SHF frequencies, you need a RF front-end to convert the high frequencies to a IF frequency of e.g. 71 MHz or to the 2 m band (137 or 145 MHz).
Typical setup: For perfect sensitivity and to compensate cable losses, we recommend to use a low noise outdoor preamplifier mounted directly to the antenna. With the F70/F23/F13, the input frequency is converted to a fixed IF frequency of 71.000 MHz. The 71 MHz signal is amplified and demodulated by our URX receiver assembly. The input frequency is controlled by a external programmable precision PLL oscillator, which generates the local frequency required by F70/F23/F13.
Supply: 12 volt (11 to 16 volt), approx. 100 mA
Dimensions: 88.6 x 109.2 mm, height approx. 25 mm
Local Oscillator input (F70): 501 to 511 MHz, +7 dBm
signal from the precision-PLL-oscillator 'PLL'.
The external oscillator is programmed to: Receiver frequency (430 to 440) plus
71.0 MHz
Local Oscillator input (F23): 564.5 to 614.5 MHz, +7 dBm
signal from the precision-PLL-oscillator 'PLL'.
The external oscillator is programmed to: Receiver frequency (1200 to 1300 MHz)
minus 71.0 MHz divided by 2.
Local Oscillator input (F13): 557.25 to 607.25 MHz, +7 dBm
signal from the precision-PLL-oscillator 'PLL'.
The external oscillator is programmed to: Receiver frequency (2300 to 2500 MHz)
minus 71.0 MHz divided by 4.
IF-Bandwidth: 300 kHz wide SAW-filter on 71 MHz with constant group delay for best phase response is used.
Terminals: RF input, LO input, IF (71 MHz) output, 12 volt supply terminals.
F70 / F23 / F13 will be available in summer 2001
PLL Programmable precision PLL for 100 to 1300 MHz. Temperature compensated / 50 Hz resolution / AFC, RIT, Fine tuning with external DC voltage, FM modulation (up to 153 kbaud FSK), 5 mW output power.
URX: IF-Receiver (40 to 200 MHz) with programmable bandwidth (30/60/150/300 kHz), two FSK outputs for 9600 up to 153 kBaud FSK, digital readout of AFC output (center meter) and signal strength (calibrated in dBm), two data outputs (narrow + wide), audio output with squelch.
BUS Info / manual of the BUS RS232 / SHACKBUS converter board