• In 1951, 220 MHz transceiver was used for civil defense

      In May 1951, radio news designed the 220 MHz transceiver for civil defense purposes. This band is selected because it is authorized to be used by the holder of the new technician level operating license. Considering the operating levels of many new amateur radio enthusiasts, it is believe...
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  • How much bandwidth do we have to spend on amateur radio?

      Did you spend some time thinking about the available bandwidth of various amateur bands? As an amateur licence holder, you can access six different amateur radio frequency bands: 80m, 40m, 15m, 10m, 2M and 70cm. If the bandwidth of each of these bands is added together, a total of 26.65mh...
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  • Entering the world of micro UHF Transmitter, 433MHz low power consumption is as small as button

    The size of the transmitter designed by tomtechtod is almost as small as the 337 button battery that supplies it. The board of the mini PCB covers a large number of patch components, most of which are packaged in 0201. Even so, the transmitter is a simple design with two transistor audio levels ...
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  • Chinese New Year Closing Notice

    Shengda Communications Co., Ltd. would like to inform the public that its office will be closed during the Chinese New Year holidays from 5th February 2021 and will resume business on 20th February 2021. We Apologize for Any Inconvenience Caused.    
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  • 144mhz cross equatorial propagation of 6102 km, FT8 or SSB mode can be used

    144mhz open 6000km cross equatorial propagation (TEP) between Buenos Aires and the Dominican Republic Through cross equatorial propagation (TEP), the highly ionized region appears on either side of the geomagnetic equator in the F-layer of the ionosphere. This mode is so interesting because it a...
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  • Conflict with the military band, New Zealand ham regret unable to use the 60 meter section

    Sorry! New Zealand amateurs cannot use the 60 meter band From October 24, New Zealand’s amateur radio enthusiasts will no longer be able to use the 60 meters. Radio amateurs in New Zealand use the band on a temporary basis, allowing ham in the region to use two frequencies, 5353.0 kHz and 5...
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  • TE connectivity launches new antennas for 5g, Nb IOT and lte-m

    Shanghai, China – September 24, 2020 – te connectivity (TE), a global leader in innovative connectivity solutions for high-speed computing and network applications, announced the launch of new antennas for 5g, Nb IOT and lte-m to meet the requirements of cellular IOT devices for diffe...
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  • May International Labour Day Closing Notice

    Shengda Communications Co., Ltd. would like to inform the public that its office will be closed during the May International Labour Day holidays from 1th May 2020 and will resume business on 4th May 2020. We Apologize for Any Inconvenience Caused.        
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  • Start to Working on 2020.02.17

    Shengda Communications Co., Ltd on 15th February  applied to the Country for resumption of work and passed the Country inspection. On 17th February , Shengda Communications Co., Ltd has started to work and the productivity has returned to normal. If you have an new inquiry, please let me know. &...
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  • WuHan Fighting! China Fighting!

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  • Chinese New Year Closing Notice

    Shengda Communications Co., Ltd. would like to inform the public that its office will be closed during the Chinese New Year holidays from 21th January  2020 and will resume business on 2th February 2020. We Apologize for Any Inconvenience Caused.
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  • New Year’s Day Closing Notice

    Shengda Communications Co., Ltd. would like to inform the public that its office will be closed during the New Year’s Day holidays from 1th January  2020 and will resume business on 2th January 2020. We Apologize for Any Inconvenience Caused.
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