The document discusses frequency extension radio front-ends for VHF/UHF range. It describes a universal structure based on a triple-conversion heterodyne frequency translator with some receive and transmit channels that have independent or phase coherent common local synthesizers and an embedded controller. The main function is frequency conversion between the radiated (RF) and digitally processed (IF) frequency domains. It also discusses the performance of the local synthesizers in terms of wide tuning bandwidth for fast frequency changing and typical phase noise and frequency settling time measurement results. Examples of typical physical implementations are shown including single channel VHF/UHF and a 4 channel coherent VHF/UHF front-end.

1. Frequency extension
Frequency extension TX/RX radio front-ends for VHF/UHF range
RF
IN
FEU
FEU
FEU
FEU
LO1
LO1
LO1
LO3
IF
OUT
FCU
FCU
FCU
FCU
LO1
LO1
LO1
LO2
LO1
LO1
LO1
LO1
From the universal
common structure
specialized font-end
tuners could derive
RF
IN
Embedded
controller
FCU
LO2
IF
OUT
LO1
VHF TX/RX
front-end
RF
OUT
FEU
FEU
FEU
FEU
FCU
FCU
FCU
FCU
IF
IN
The main function of the frequency extension radio front-end is the
frequency conversion between the radiated (RF) and digitally
processed (IF) frequency domain
UHF multi-channel
RX front-end
RF
IN
The universal structure is based on a triple-conversion heterodyne
frequency translator with some receive and transmit channels with
independent or phase coherent common local synthesizers and
embedded controller.
FCU
RF
OUT
FEU
FEU
FEU
FEU
LO3
FCU
FCU
FCU
FCU
LO2
IF
IN
IF
OUT
LO1
Performance of the local synthesizers
The local frequency
synthesizers of our tuners
are optimized for wide
tinning bandwidth for fast
frequency changing
Typical frequency settling
time measurement result
(15us time for 2MHz step)
Typical phase noise
measurement result
(-100dBc/Hz @10KHz)
Typical physical implementations
VHF (20-520MHz)
single channel
TX/RX front-end
Analysis of 4Mcps wideband DSSS signal
using DCU-214 based spectrum analyser
4 channel coherent
VHF/UHF
(20-3000MHz)
RX front-end
Tuner control software as Windows based GUI
www.sagax.hu
UHF (20-3000MHz) single ch. RX
Microwave 24GHz) single ch. RX/TX
Sagax, Ltd.
Ltd.
Haller u. 11-13.
111096 Budapest, HUNGARY