sp 2000

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sp 2000

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Antennas : VHF UHF
  • Modifications to the Diamond V2000 and similar antennas - This kind of antenna has grown in popularity over the last years because it gives you a decent performance and triband capabilities. But its 50 MHz design is far from optimal. Here you can learn how to improve its 50 MHz performance in a very easy way.
    [ Hits: 627 | Votes: 2 | Rating: 9.5 ]
Operating Modes : Morse code : Learning Morse Code
  • Recognition of CW signs at different listening levels and frequencies - The recognition of telegraphy masked by noise at 40 and 80 signs/min telegraphy speed was studied in 10 normal-hearing subjects at different sound pressure levels (25-85 dB SPL in steps of 5 dB) as well as at different test frequencies (2000, 1000, 800, 630, 500 and 250 Hz). The ability to recognize the signs varied with varying SPL. Recognition for most of the subjects was best at an SPL close to 70 dB. All subjects improved their recognition as the frequency was lowered to 500 Hz, some even at 250 Hz. These facts should be taken into consideration when training telegraphy operators as well as in the construction of radio receivers to permit listening at low frequencies. Furthermore, the critical ratio was calculated at the different test frequencies.
    [ Hits: 81 | Votes: 1 | Rating: 7 ]
Radio Equipment : Receivers : Icom IC-R7100
  • IC R7100 Specifications - VHF-UHF receiver covers from 25 to 800 and 900 to 2000 MHz in the following modes: AM, AM-W, FM, FM-W, FM-N, USB and LSB
    [ Hits: 277 | Votes: 0 | Rating: 0 ]

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