Hello everyone, this isHobby radio enthusiasts group (non-university student organization) at Civil Aviation University of ChinaCurrently, there are amateur radio enthusiasts with licenses within the school.26 individualsThis includes all colleges and majors within the university, and the number of participants is constantly increasing.
A traditional practice at our school is to hold a "name check" event for each new HAM (amateur radio operator) who joins. This serves as a welcome and provides an opportunity for both the new HAM and other amateur radio enthusiasts, both inside and outside the school, to connect and socialize.The primary focus is on new participants voluntarily registering and developing their communication skills, on-site handling capabilities, and other related abilities.
This internal attendance activity coincided with May 12th, so we considered incorporating SSTV mode into the normal attendance process to transmit image information, based on the actual needs of emergency communication.This event has received strong support and participation from both students and faculty within the school community!
Here are the basic details:
Date: May 12, 2024
Time: 9:00 PM - 10:10 PM
Frequency: 439.220 MHz
Master control: BI3AO
Logistics support: BH3FZA
Equipment: QYT KT-8900, ZASTONE D-9000 (backup), SHX8600 (auxiliary)
Antenna: NL-R2 (with 3m mast), OPEK VH-108M (backup)
Power: 20 watts
Power source: 10800mAh lithium battery
The SSTV reception uses the computer software MMSSTV, and a 3.5mm audio cable is used to connect the KT8900 audio device to the computer for decoding.
Once the normal attendance information exchange is complete, the main controller will ask if SSTV transmission is active. If so, the audio line will be connected to the computer for receiving and decoding; otherwise, the process will continue with the next station's attendance.
In the end, 27 volunteer stations successfully conducted attendance checks using different devices, antennas, and formats. Of these, 13 volunteer stations used SSTV to transmit image information.
The furthest point is Tonggu Youtai, with a straight-line distance of over 30 kilometers.
There were also some shortcomings in this event:
① The selected frequency experiences interference due to the presence of a crane.
② The antenna equipment on the control console was not in good condition; it was too low.
③ Using an audio cable to connect to the computer amplifies the noise, resulting in poor image quality after decoding.
④ The device used to transmit SSTV needs to be pre-configured with the maximum transmission time (TOT). The SSTV-PD90 mode has a transmission time of 90 seconds, and there is a possibility that the receiver will enter self-protection mode if the SSTV transmission is not completed.
⑤ The SSTV-PD90 mode for transmitting images in emergency situations has certain limitations and technical barriers.
Finally, I would like to thank all our friendly partners forAmateur radio enthusiast at Civil Aviation University of ChinaWe appreciate the support and encouragement. Thank you everyone for participating in this naming event! There are still many areas for improvement in this event, and we will continue to learn and improve our technology and equipment. We hope to meet everyone again with better performance, better communication quality, and a more enjoyable experience in the airwaves.
DE BI3AO
Please find attached photos from previous internal events for enthusiasts:
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