The Icom IC Adam Farson VA7OJ. A New Top-class HF/6m Transceiver. IC-7700 Information & Links
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1 The Icom IC-7700 A New Top-class HF/6m Transceiver Adam Farson VA7OJ IC-7700 Information & Links Copyright 2008 North Shore Amateur Radio Club NSARC HF Operators IC
2 IC-7700 front panel This is a big radio. 425(W) x 149 (H) x 437 (D) mm, 22.5 kg. NSARC HF Operators IC
3 IC-7700 rear panel NSARC HF Operators IC
4 IC-7700: Main Points! Single, no-compromise receiver: +40 dbm IP3 at 50 khz offset " Front end similar to IC-7800, with improved strong-signal handling " Large RF BPF inductors, Digisel tracking preselector, 2 linear low-noise preamps, DMOS 1 st mixer " All front-end RF circuits relay-switched to eliminate switching-diode IMD " Dedicated high-performance 6m front end optimized for that band! Rugged 200W MOSFET transmitter " PA stage utilizes a pair of MRF150 MOSFETs (V DD = 48V) " Delivers 200W in all modes, at full duty cycle " Comprehensive VSWR and thermal protection " Full metering: P O, V DD, I D, ALC, SWR, temperature " Up-converting architecture: 36 khz DSP IF 455 khz MHz TX freq.! Internal high-speed automatic antenna tuner " Covers HF and 6m bands! Quiet, internal switch-mode mains PSU " Adapts automatically to mains voltage V, 50/60 Hz! Selectable 15, 6 & 3 khz roofing filters " MCF s optimized for low passive IMD, mounted on plug-in daughter-boards! Precision 10 MHz OCXO with 5 x 10-8 frequency stability " The precision OCXO with 10 MHz REF I/O port allows the IC-7700 to clock other equipment, or to be clocked from a higher-level master clock source NSARC HF Operators IC
5 IC-7700: Main Points (cont.)! Two independent DSP units " One DSP (TI TMS320C6727) is dedicated to the transmitter and receiver, and the other (TI TMS320C6720) to the spectrum scope. These are of a later generation than the TMS320C6713 used in the IC-7800.! 7 color TFT LCD display (800 x 400 pixels) " The display includes a simulated analogue multi-function meter " Rear-panel VGA port for external video monitor! Multi-function spectrum scope with selectable RBW " Selectable resolution bandwidth (min. RBW = 100 Hz) permits spectral analysis of received signals " Displays span centered on RX frequency (CENT) or a defined frequency range (FIX) " IMD products and spurs can be displayed " Displays spectrum of transmitted signal! Built-in RTTY/PSK31 modem requiring only a USB keyboard " The built-in RTTY/PSK31 modem allows use of the IC-7700 as a complete digimode terminal, requiring only a keyboard. This is great for semi-portable operation (e.g. Field Day) or when shack space is at a premium. FFT spectral, waterfall and vector tuning aids are provided.! Comprehensive IF-DSP selectivity filtering for all modes " Continuously-adjustable bandwidth, selectable shape factors, optimized defaults for each mode " Twin Passband Tuning allows independent adjustment of lower & upper passband flanks! IF-DSP dual-loop AGC " AGC decay times selectable via menu or adjustable via front-panel control " Excellent transient response, without clamping NSARC HF Operators IC
6 IC-7700: Additional Features! IF-DSP manual notch filter with adjustable parameters " The manual notch filter shape factor is selectable in 3 steps, and its maximum stopband attenuation is 70 db. The manual notch is within the AGC loop.! IF-DSP auto-notch filter " Auto-notch is post-agc, and suppresses single or multiple tones! High-performance IF-DSP noise blanker (NB) " NB is DSP process ahead of AGC derivation point " NB suppresses single or periodic impulsive RF events before they can cause AGC activity " Adjustable threshold (front-panel control), blank depth & width (menu)! IF-DSP noise reduction (NR) " Does correlation discrimination on noise vs. signal; computes out noise " 16 levels, adjustable via front-panel control " Post-AGC; heuristic ( learns prevailing noise condition)! IF-DSP CW Audio Peak Filter (APF) and RTTY Twin Peak Filter (TPF) " CW APF is tunable; 3 bandwidth settings available " TPF passes RTTY mark & space tones! High-quality digital voice recorder " Record off-air or from microphone; play mic recordings on-air " Load/save.WAV files NSARC HF Operators IC
7 IC-7700: Additional Features (cont.)! Front-panel USB ports for USB memory drive & keyboard " Load/save Digital Recorder.WAV files, configuration settings, RTTY/PSK31 text " Upload new system firmware (alternately via rear-panel Ethernet port)! DSP-derived transmit monitor " Samples transmit IF signal " Accurately reproduces transmitted SSB, AM and FM signal! Dual VFO s with one-button Split " Allows rapid switch-over to Split mode! One-button XFC (TX frequency check) " Permits monitoring of transmit frequency in Split mode! Voice-activated squelch control (VSC) " Responds to speech signals only " Usable in SSB, AM and FM modes! S/P-DIF optical digital baseband interface " Optical digital interface for baseband input/output in digital domain " Connect external audio devices with integral codec for highest audio quality NSARC HF Operators IC
8 Evolution of TI DSP family as used in the IC-7700 NSARC HF Operators IC
9 IC-7700 Screen Display Spectrum Scope: ± 2.5 khz span, 100 Hz RBW BW: IF Bandwidth SFT: Passband Shift BPF: Tight Shape Factor F-BKIN: QSK NSARC HF Operators IC
10 IC-7700 RTTY & PSK31 Displays RTTY & PSK31 TX/RX text fields & tuning aids RTTY PSK31 RTTY Decoder Setup Menu NSARC HF Operators IC
11 IC-7700 Receiver Simplified Block Diagram NSARC HF Operators IC
12 IC-7700 Interior View Chassis underside NSARC HF Operators IC
13 IC-7700 Interior View Chassis top side, showing airflow PA PSU ATU SPKR NSARC HF Operators IC
14 IC-7700 Automatic ATU NSARC HF Operators IC
15 IC-7700 RX BPF Unit Note filter selection relays & large toroid cores NSARC HF Operators IC
16 IC-7700 Digisel Preselector and characteristics at 14 MHz NSARC HF Operators IC
17 IC W PA Unit showing heatsink and MRF150 PA devices NSARC HF Operators IC
18 IC MHz OCXO Stability: 5 x 10-8 NSARC HF Operators IC
19 IC-7700 Component Details BPF coil detail RF relay with bifurcated noble-metal contacts TX/RX DSP IC (250 MHz clock) NSARC HF Operators IC
20 IC-7700 Roofing Filter Group WIDE 15 khz, MIDDLE 6 khz, NARROW 3 khz The MCF roofing filters are at the MHz 1 st IF output of the 1 st mixer. They are optimized for minimum passive IMD, to ensure best strong-signal handling. NSARC HF Operators IC
21 3 khz Roofing Filter Passband 3 khz roofing filter detail 3 khz roofing filter passband (50 khz span) NSARC HF Operators IC
22 Links for further study! NSARC HF Operators IC
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