F70 / F23 / F13 UHF / SHF Receiver front-end      (19.09.14 )

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).

Technical specifications (preliminary):

Frequency range: any frequency within a +/- 5 % wide band in the range of 150 to 1500 MHz. (A version for frequencies up to 2.5 GHz is planned) 

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.

Availability:

F70 / F23 / F13 will be available in summer 2001

SHACKBUS devices to be used with F70 / F23 / F13:

  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.jpg (30540 Byte)   BUS  Info / manual of the BUS RS232 / SHACKBUS converter board