SLIDE 1
70cm transverter By G4DDK EME2018
Contents
- Introduction to the Iceni
- Design of the transverter
- Device update
- Analysis
- receiver,
- Transmitter
- Local oscillator
- Frequency locking
- Summary
Iceni 70cm transverter By G4DDK EME2018 Contents Introduction to - - PowerPoint PPT Presentation
Iceni 70cm transverter By G4DDK EME2018 Contents Introduction to - - PowerPoint PPT Presentation
Iceni 70cm transverter By G4DDK EME2018 Contents Introduction to the Iceni Design of the transverter Device update Analysis receiver, Transmitter Local oscillator Frequency locking Summary Iceni -A 70cm
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Iceni -A 70cm transverter design for the home constructor
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Iceni (I-see-nee)
- An ancient Celtic tribe who
inhabited the east of England 2000 years ago.
- Their queen, Boudica, famously
drove the Romans out of Colchester and London, before suing for peace (was this the first attempt at Brexit?)
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Iceni design
The schematic block diagram of the Iceni will be familiar as that of a conventional single conversion Up/down converter. Mixer Filter Transmit Amplifier RF Amplifier LO Multiplier 101MHz Xtal
- scillator
IF Post mixer Amplifier & BPF Input attenuator 28MHz 28MHz 101MHz 432MHz 432MHz Control/ interface
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Device update
Due to Broadcom acquisition of Avago, certain devices are no longer available However, thanks to MiniCircuit Inc.
- PGA105+ replaces the MGA30689
Last year, after input from SM5BSZ, the
- PSA4-5043 replaces the SPF5043
And as a further Broadcom/Avago update, the SAV540+ now replaces the ATF54143 in the VLNA preamps with proven equally good results.
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Device update 2
The level 13 ADE-751MH is now offered as a replacement for the (nearly pin-compatible) level 7 ADE-13
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ADE-751MH Modification
Easily modified existing V1.0 PCBs
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AppCAD analysis of receiver - ADE13
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ADE751 mixer upgrade
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Iceni noise figure and gain
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Measurement of dynamic range
G R&S SMG MI2024 ZFRSC-42 ICENI HP8592L 432.180MHz 432.200MHz Calibrate 28.190MHz CF
- 40dBm/tone
- 16dBm/tone
Texscan With ADE13
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Measurement of Rx dynamic range 2
ADE751MH Mixer
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Transmit analysis – ADE751MH
LO
Mixer Diplexer Diode switch
BPF
Attenuator 432MHz BPF
Diode switch Tx amplifier
432MHz BPF
Tx amplifier
Low PF
Transmit chain ADE751MH
28MHz 432MHz 404MHz 0dBm
- 3dBm
- 10dBm
- 15dBm
+9dBm +4dBm +17dBm +13dBm
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Toko 1072A helical filters
Available from RF Microwave (Frank Rota)
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Transmit analysis 2
Spectrum from 10MHz to 1510MHz 0dBm IF carrier drive K3 2-tone drive at 50mW PEP output 3rd order -40dBc/tone
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Local oscillator analysis
101MHz Butler oscillator (SM5BSZ) x 4 = 404MHz Local oscillator amplifier LPF and BPF
- 145dBc/Hz@404MHz
- 144dBc/Hz
+12 / +13dBm at 404MHz 10kHz separation
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Local oscillator injection locking
Iceni
External 101MHz source External LO input
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Checking phase of the two LOs
G R&S SMG MI2024 ZFRSC-42 ICENI #1 101MHz 432.200MHz 28.200MHz ICENI #2 Extl LO Extl LO RF in RF in Ch 1 Ch 2 Dual channel 60MHz scope ZFRSC-42
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Diversity arrangement
404MHz 432MHz
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Locked dual oscillators
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Summary of performance and kits
Designed as a low cost but good performance 70cm transverter with 10m IF Readily upgradeable for power output using the G4BAO driver or Mitsubishi PA module Can be frequency locked with simple injection locking Two can be used for dual polarity diversity reception using common injection locking PGA432 preamplifier can be used with the Iceni to improve sensitivity At present full kits are available. With the exception of the PCB all parts are readily available from a number of sources Construction is fully documented at G4DDK.COM