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AA5AU Don Hill

AA5AU Don Hill. Icom IC-756 PRO III Presentation, February 2005. Icom 756 PRO III – Icom’s third generation of the PRO series IC-756PRO IC-756 PRO II IC-756 PRO III – introduced in mid 2004, available 12/04. Back to PRO III page Back to Lagniappe Page Back to rttycontesting.com.

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AA5AU Don Hill

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  1. AA5AU Don Hill Icom IC-756 PRO III Presentation, February 2005.

  2. Icom 756 PRO III – Icom’s third generation of the PRO series • IC-756PRO • IC-756 PRO II • IC-756 PRO III – introduced in mid 2004, available 12/04 Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  3. AA5AU SO2R (SINGLE OP 2 RADIO) SETUP Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  4. How did I come to obtain two new PRO III’s? • Icom America sponsors the awards for the NAQP RTTY Contest. • AA5AU has won 5 of the last 6 NAQP RTTY Contests. • After each win, I send a “thank you” E-mail to Ray Novak N9JA with Icom for sponsoring the winning plaque. • After winning the July 2004 NAQP, Ray asked me what kind of radios I used. • When I told him “Kenwood”, he asked what it would take for me to use Icom radios. • I said “send them to me”. • So he did! • I received the radios on December 21, 2004. • Radios are on consignment for two months (or end of February). • I will buy at least one of them, if not both. Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  5. This Presentation includes… • CW, RTTY & PSK31 filtering • Twin Pass Band Tuning (PBT) • Bells & Whistles • Dislikes Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  6. PRO III vs. TS-870 Filtering • Both radios have built-in filters. There are no extra filters to buy. • PRO III has both sharp & soft filtering for CW and SSB. • PRO III has a special RTTY-only filter. • PRO III has a Twin Peak Filter (TPF) for RTTY. Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  7. CW Filtering • PRO III vs. TS-870 • TS-870 has 6 filter settings, 50 hz, 100 hz, 200 hz, 400 hz, 600 hz & 1000 hz. • PRO III has 50-500 hz in 50 hz steps, then 500-3600 hz in 100 hz steps (41 settings) • PRO III has both sharp & soft CW filter settings for each of the 41 bandwidths. • PRO III has an excellent manual notch filter for CW (and SSB). Does not work in RTTY mode. Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  8. Differences between the PRO III CW soft and sharp filtering (400 hz) Soft Sharp Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  9. Differences between the PRO III sharp & TS-870 CW 400 hz filter PRO III TS-870 Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  10. Differences between the PRO III & TS-870 CW 200 hz filter PRO III TS-870 Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  11. Differences between the PRO III & TS-870 CW 100 hz filter PRO III TS-870 Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  12. Differences between the PRO III & TS-870 CW 50 hz filter PRO III TS-870 Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  13. RTTY Filtering • PRO III vs. TS-870 • TS-870 has 4 filter settings, 250 hz, 500 hz, 1000 hz &1500 hz. • PRO III has 50-500 hz in 50 hz steps, then 500-2700 hz in 100 hz steps (32 settings) as “regular” filtering in RTTY mode. • PRO III has a special “RTTY” filter with available BW’s of 250 hz, 300hz, 350hz, 500hz & 1k (5 filter bandwidths available). Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  14. Difference between the PRO III “standard” and PRO III “RTTY” filter PRO III 250 hz standard filter PRO III 250 hz RTTY filter Test set-up was MMTTY FFT & waterfall display with a bandwidth of 500 Hz Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  15. Difference between the PRO III “RTTY” and TS-870 RTTY filter PRO III 250 Hz RTTY filter Kenwood TS-870 250 hz filter Test set-up was MMTTY FFT & waterfall display with a bandwidth of 500 Hz Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  16. Difference between the PRO III “RTTY” and TS-870 RTTY filter PRO III 500 Hz RTTY filter Kenwood TS-870 500 hz filter Test set-up was MMTTY FFT & waterfall display with a bandwidth of 1 kHz Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  17. Difference between the PRO III “RTTY” and TS-870 RTTY filter PRO III 250 Hz RTTY filter Kenwood TS-870 250 hz filter Test set-up was MMTTY FFT & waterfall display with a bandwidth of 1 kHz Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  18. PRO III Twin Peak Filter • Introduces a high amount of audio noise when activated (noted in manual). • No real difference found in print between “RTTY” and TPF filter on moderate to strong signals. • Biggest advantage of the TPF is on very weak signals. • TPF only works with high tones 2125/2295 Hz mark/space. Set for 170 Hz. • TPF only works when RTTY filter is active. Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  19. Difference between the PRO III “RTTY” and PRO III “TPF” RTTY filter PRO III 250 Hz RTTY filter PRO III 250 Hz TPF RTTY filter Test set-up was MMTTY FFT & waterfall display with a bandwidth of 1 kHz Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  20. PSK (or other digital modes) Filtering • SSB filters can be used for PSK and other digital modes. • SSB filtering bandwidths of 50-500 Hz in 50 Hz increments ideal for AFSK digital modes. • SSB filtering also available 500-3600 Hz in 100 Hz increments. • Centered on 1500 Hz? Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  21. SSB filter setting of 2 kHz centered on 1500 Hz SSB filter setting of 600 Hz centered on 1500 Hz Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  22. SSB filter narrowed down to 200 Hz centered on 1500 Hz. The ability of reducing the SSB filter bandwidth to as low as 50 Hz allows the elimination of strong interfering signals and can be the difference between working that new one on PSK. Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  23. Twin Pass Band Tuning (PBT) • Narrows IF passband width by shifting filter passband (IF shift). • Uses DSP circuit for PBT function. • Adjustable in 25 or 50 hz steps. • Functions as IF shift only in RTTY & AM. • Used to eliminate interference. • Works very well. • PBT cleared & centered with one button. Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  24. Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  25. Useful Bells & Whistles – Page 1 • Spectrum Display • The ultimate contesting tool. • Great for finding signals on low activity bands. • Great for seeing signals intruding on your run frequency when contesting. • Used to find noise or interference. • Great tuning tool by using the HOLD function. Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  26. Useful Bells & Whistles – Page 2 • Dual Watch • RTTY Decoder (also has TX memories) • Built-in Digital Voice Recorder • Timer & Screen Saver • Variable DSP Noise Reduction • Two Preamplifiers • Many more I haven’t discovered yet Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  27. Dislikes • Connection for RTTY on ACC1 jack • PRO III doesn’t come with an ACC 1 or 2 plug • CI-V interface required for radio control • Manual notch filter does not work in RTTY mode. • Rear panel not well labeled • RTTY decoder screen print too small • RTTY TPF high noise level • No radio control command for PTT (requires an external PTT interface) Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

  28. Conclusion – the Icom IC-756 PRO III is the best transceiver I’ve used. It’s a fun radio with loads of usable features. Back to PRO III pageBack to Lagniappe PageBack to rttycontesting.com

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