K3 Power Point

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K3 Power Point

  1. 1. Inside the K3 High Performance Rig Design Dynamic Range is your friend! Hands on Ham Radio . © 2009 Elecraft, Inc.
  2. 2. The K3 HF Transceiver
  3. 3. K3 – What’s New? <ul><li>High performance 1 st IF Filters down to 200 Hz @8.215 MHz </li></ul><ul><li>IF Shift / Pass Band Tuning </li></ul><ul><li>High Performance Noise Blankers: H/W and DSP– Both Adjustable </li></ul><ul><li>8 Band Parametric TX & RX Equalizers </li></ul><ul><li>PSK, RTTY, CW Decode. ( Send data modes from CW paddle!) </li></ul><ul><li>General Coverage RX BPF Option </li></ul><ul><li>High Performance ATU w/2 ANTs - Matches 10:1 SWR </li></ul><ul><li>100% Remote Controllable; Built-in isolated sound card interface </li></ul><ul><li>K3 MCU & DSP Software Upgrades via the Internet (or local files) </li></ul><ul><li>Up to 9 Transverter Bands with correct frequency display. </li></ul>
  4. 4. K3 – RX performance <ul><li>Hybrid SDR / Analog Design </li></ul><ul><li>High Q front end band-pass filters </li></ul><ul><li>Switching Mixer = Better Dynamic Range </li></ul><ul><li>Low Noise Synthesizer (L.O.) </li></ul><ul><li>Dual Diversity RX = More signals heard . </li></ul>
  5. 5. <ul><li>Fully independent High-Performance RX </li></ul><ul><li>Independent Synthesizer, NB, filters etc </li></ul><ul><li>Split off of main RX path or from a 2 nd Antenna </li></ul><ul><li>3 modes of operation: </li></ul><ul><ul><li>Sub RX = VFO B (VFO B = TX if running split) </li></ul></ul><ul><ul><li>Linked: Sub, VFO B, Tracks VFO A (with or without offset) </li></ul></ul><ul><ul><li>Dual Diversity: True phase locked RX from two antennas at once. </li></ul></ul>K3 High Performance Sub-Receiver
  6. 6. Dual Diversity RX <ul><li>Two identical, phase locked Receivers. </li></ul><ul><li>Use different antennas (TX ant, beverage etc.) </li></ul><ul><li>Tune both together with main VFO knob </li></ul><ul><li>RX1 in left ear, RX2 in right ear. </li></ul><ul><li>Different signal arrival angles and directions. </li></ul><ul><li>Fades at different times in each RX = less fills. </li></ul><ul><li>Pile-ups / QRM spread out spatially. Use your brain to pick out signals by their L-R location. (+3 to 6 dB) </li></ul>
  7. 7. <ul><li>High Resolution Color Real-Time Spectrum Display </li></ul><ul><li>Fast Spectrum and Waterfall Displays (+ Split Screen) </li></ul><ul><li>Plug and Play with the K3 – No PC S/W Problems! </li></ul><ul><li>Full Integration with K3 – Panadapter Tracks Main/Sub VFOs, Point and Click Tuning etc. </li></ul><ul><li>Software Downloadable for future options. </li></ul><ul><li>Ships by end of this year (2009) </li></ul>P3 DSP Panadapter for the K3
  8. 8. P3 - DSP Panadapter for the K3 P3 in Full Spectrum Display Mode
  9. 9. P3 - DSP Panadapter for the K3 P3 in Split Waterfall / Spectrum Display Mode
  10. 11. <ul><li>De-sensing of RX by off freq. signals </li></ul><ul><li>Impacted by RX front end design. </li></ul><ul><li>Impacted by PLL Phase Noise </li></ul><ul><li>Test Methods: 20, 5, 2 kHz spacing </li></ul><ul><li>K3 BDR = 140 dB+ </li></ul>Blocking Dynamic Range “De-sense”
  11. 12. <ul><li>Inter-modulation between strong multiple off frequency signals produces distortion products inside the receive IF bandwidth. </li></ul><ul><li>Dynamic Range = IMD Signal Level - MDS </li></ul><ul><li>K3 IMDDR3 = 104 dB </li></ul>IMD Dynamic Range “Intermod”
  12. 13. Dynamic Range
  13. 14. Subject: K3 testing Date: Sat, 09 Feb 2008 From: Rob Sherwood <Rob@nc0b.com> Dear Eric and Wayne, The high side and low side IMD is very well behaved, and virtually identical. Good job. 3rd order intermod dynamic range @ spacings: 100 kHz 500/500 filtering: 104 dB 20 kHz 500/500 filtering: 104 dB 5 kHz, 500/500 filtering: 102 dB 2 kHz 200/200 filtering: 101 dB It looks like you are top dog now! Better than the Orion II, the Flex 5000A and certainly better than the IC-7800.
  14. 15. <ul><li>DSP AGC impulse rejection = Smooth RX </li></ul><ul><ul><li>Subject: K3 </li></ul></ul><ul><ul><li>Date: Sat, 09 Feb 2008 </li></ul></ul><ul><ul><li>From: Rob Sherwood [email_address] </li></ul></ul><ul><li>..the K3 passes the ‘Sherwood AGC test’ with flying colors. </li></ul><ul><li>1 V. P-P very fast rise time pulse, 1 PPS, is basically ignored by the AGC </li></ul><ul><li>I think it is better than all the other rigs that have come out in the last few years which fail miserably: FTDX-9000, FT-2000, Orion II, Omni-VII, IC-7000, IC7800. </li></ul>AGC Performance
  15. 16. <ul><ul><li>Phase noise = the off frequency sideband energy of your local oscillator (VFO) in RX and TX. </li></ul></ul><ul><ul><li>High Phase Noise: </li></ul></ul><ul><ul><ul><li>Limits Sensitivity and Dynamic Range by mixing off frequency signals on to your IF frequency. Limits Blocking DR. </li></ul></ul></ul><ul><ul><ul><li>Transmits broadband noise across all of the band. </li></ul></ul></ul><ul><ul><li>The K3’s Receive and TX Phase noise is -140 dBc at 10 kHz, -150+ dBc at wider spacings. 15-25 dB lower than ‘pure’ SDR transceiver TX and RX phase noise. </li></ul></ul>Phase Noise
  16. 17. <ul><li>Strong Front End Design </li></ul><ul><ul><li>Hi-Performance Switching Mixer, Post Mixer Amp. </li></ul></ul><ul><li>Narrow Band-pass Front End Filters </li></ul><ul><li>Low Phase Noise (Low noise LO) </li></ul><ul><li>Optimal Gain Distribution; AGC Design </li></ul><ul><li>High Performance Crystal Filters </li></ul><ul><li>True Dual Diversity RX opens up a new dimension. </li></ul>K3: The Basics = Great RX Performance
  17. 18. VP6DX <ul><li>All K3 DXpedition to Ducie Island (Pitcairn) </li></ul><ul><li>New records for number of stations worked. </li></ul><ul><li>2 K3s on all bands simultaneously (CW/SSB) </li></ul>

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