sid receiver
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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 ]
- FLEX-6400M DSP Review
- A guest review of the FLEX-6400M DSP HF Trasnceiver considering just the receiver part of this radio.
[ Hits: 136 | Votes: 0 | Rating: 0 ]
- Improving Icom IC-7300 ADC Aliasing
- The ICOM IC 7300 SDR radio has a very nice receiver for ham bands, but outside these bands the reception is not 100% reliable. This is due to the ADC aliasing phenomena of SDR receivers.
[ Hits: 205 | Votes: 2 | Rating: 5.5 ]
- A 2.3GHz to 432MHz receiver converter
- Receiver converter that can be plugged to the backside of the Yaesu FT-817 battery powered portable transceiver
[ Hits: 1496 | Votes: 3 | Rating: 4 ]
- 2.3GHz to 432MHz RX converter for FT-817
- A very small receiver converter that can be plugged to the backside of the battery powered portable transceiver FT817 from Yaesu. A high performance receiver for 2.3GHz amateur radio signal
[ Hits: 223 | Votes: 3 | Rating: 1.67 ]
- HF Weather Fax
- HF Weather Fax for Android decodes weather fax 120/576 charts and satellite images through the microphone of your Android phone or tablet.
Just set your phone or tablet next to the speaker of your marine radio or any other shortwave receiver with sideband capability and start recording weather charts and images
[ Hits: 2310 | Votes: 9 | Rating: 5.67 ]
- DSPRX
- Signalprocessing for SSB - Direct Conversion Receiver using Phasemethod for Sideband Supression, does all necessary signalprocessing for Direct conversion Receivers using IQ-mixer for demodulation.
[ Hits: 2476 | Votes: 0 | Rating: 0 ]
- Build A Single-Sideband Transceiver From Scratch
- How to build a complete Single-Sideband amateur radio transceiver from scratch. Article published on hackaday dot com includes an introduction to radio architectures, ssb receivers and tramsitter
[ Hits: 301 | Votes: 1 | Rating: 10 ]
- 30m QRP Transceiver kit
- 38 Special, 30m QRP transceiver by Norcal QRP club, single super het receiver, full QSK with sidetone smoothly
[ Hits: 14988 | Votes: 16 | Rating: 5.31 ]
- QRP equipment
- Simple QRP rigs, Transceivers with single side band direct conversion receivers, Receivers, Frequency counters for QRP
[ Hits: 12814 | Votes: 10 | Rating: 8.79 ]
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