Radio Sets Research Articles

Specific Emitter Identification of Frequency Hopping Signals Based on Feature Extraction and Deep Residual Network

In the modern war with complex and changeable electromagnetic environment, Specific Emitter Identification (SEI) is an important and difficult problem, which is of great significance in obtaining intelligence information, identifying ourselves or foe, and specifying combat plans. In order to solve the problems of low accuracy, poor robustness and difficulty in extracting effective individual features of frequency hopping (FH) radio set, this paper studies the generation of PSK signal constellation to proposes a radio frequency fingerprint(RFF) based on constellation. We also improved the existing RFF extraction method, combined with the deep learning recognition method based on the Deep Residual Network (ResNet), to achieve effective feature fusion. By comparing different input methods, we found that the recognition accuracy is improved, and reaches 96.16% in the outfield experiments of 15 FH radio sets. In addition, we also designed a ResNet structure to compare the recognition accuracy under different signal-to-noise ratio(SNR), different network structure, different number of individuals, different modulation methods and different recognition algorithms, which proved the superiority of our method.

Processing and Analysis for Radio Science Experiments (PARSE): Graphical Interface for Bistatic Radar

Abstract Opportunistic bistatic radar (BSR) observations of planetary surfaces can probe the textural and electrical properties of several solar system bodies without needing a dedicated instrument or additional mission requirements, providing unique insights into volatile enrichment and supporting future landing, anchoring, and in situ sampling. Given their opportunistic nature, complex observation geometries, and required radiometric knowledge of the received radio signal, these data are particularly challenging to process, analyze, and interpret for most planetary science data users, who can be unfamiliar with link budget analysis of received echoes. The above impedes real-time use of BSR data to support mission operations, such as identifying safe landing locations on small bodies, as was the case for the Rosetta mission. To address this deficiency, we develop an open-source graphical user interface—Processing and Analysis for Radio Science Experiments (PARSE)—that assesses the feasibility of performing BSR observations and automates radiometric signal processing, power spectral analysis, and visualization of DSN planetary radio science data sets acquired during mission operations or archived on NASA’s Planetary Data System. In this first release, PARSE automates the processing chain developed for Dawn at Asteroid Vesta, streamlining the detection of DSN-received surface-scatter echoes generated as the spacecraft enters/exits occultations behind the target. Future releases will include support for existing Arecibo data sets and other Earth-based radio observatories. Our tool enables the broader planetary science community, beyond planetary radar signal processing experts, to utilize BSR data sets to characterize electrical and textural properties of planetary surfaces. Such tools are becoming increasingly important as the number of space missions—and subsequent opportunities for orbital radio science observations—continue to grow.

Организация производства радиостанции Р-113 «Гранат» на Рязанском радиозаводе в 50-60-е гг. ХХ века

The study aims to analyse the fulfillment of the state defence order regarding mass production of the R-113 tank radio sets “Granat” at the Ryazan radio manufacturing plant. The paper sheds light on the process of production of complex radio technical apparatus. Considerable attention is paid to the technical re-equipment of the plant. The paper identifies and describes the characteristic features of sophistication of production, its mechanisation and automation. The work is novel in that it carries out a comprehensive analysis of the considered issue based on the introduction of new singular archival materials of both regional and union-republic significance into scientific use. As a result, the researcher has proved that despite the extremely difficult economic conditions, the authorities of the Ryazan region were able to organise mass production of the tank radio set and fulfill the defence order that ensured the state’s power and national security.

Editorial

Editorial

Analysis of Accessibility and Level of Knowledge of Farmers on the Use of ICT among Small Holder Rice Farmers in Southeast, Nigeria

The study examined Analysis of accessibility and Level of Knowledge of Farmers on the Use of ICT among small holder rice farmers in Southeast, Nigeria. Specifically, it described ICT accessibility and level of knowledge of farmers in the use of ICT and Significant relationship between the farmers’ accessibility and knowledge and their level of use of ICT. Data were collected with a well-structured questionnaire from 476 randomly selected rice farmers and were analyzed using a combination of analytical tools such as descriptive statistics, Analysis of variance, correlation and z-test. The information on ICT tools/format accessibility revealed that out of all the accessible ICT tools/format, only Radio set, Television, Mobile Phone, Short Message Services, and On-line Magazines were effectively used. It was discovered that rice farmers have a low knowledge on the use of ICT in their rice farms. Information meant for rice farmers should be tailored to their specific need and more trainings should be organized for rural people on the use of ICT tools/format to help boost their confidence and reliance on ICT gadgets for information were recommended. Keywords: Analysis of accessibility, Level of Knowledge, ICT gadgets, small holder rice farmers, Southeast Nigeria.

Are Delayed Radio Flares Common in Tidal Disruption Events? The Case of the TDE iPTF 16fnl

Abstract Radio emission from tidal disruption events (TDEs) originates from an interaction of an outflow with the super-massive black hole (SMBH) circumnuclear material (CNM). In turn, this radio emission can be used to probe properties of both the outflow launched at the event and the CNM. Until recently, radio emission was detected only for a relatively small number of events. While the observed radio emission pointed to either relativistic or sub-relativistic outflows of different nature, it also indicated that the outflow has been launched shortly after stellar disruption. Recently, however, delayed radio flares, several months and years after stellar disruption, were reported in the case of the TDE ASASSN-15oi. These delayed flares suggest a delay in the launching of outflows and thus may provide new insights into SMBH accretion physics. Here, we present a new radio data set of another TDE, iPTF 16fnl, and discuss the possibility that a delayed radio flare also has been observed in this case, ∼5 months after optical discovery, suggesting that this phenomenon may be common in TDEs. Unlike ASASSN-15oi, the data for iPTF 16fnl is sparse and the delayed radio flare can be explained by several alternative models: among them are a complex varying CNM density structure and a delayed outflow ejection.

THE USE OF INFORMATION AND COMMUNICATION TECHNOLOGIES AMONG AGRICULTURAL EXTENSION PERSONNEL IN LAGOS STATE, NIGERIA

To enhance agricultural production in developing countries, the use of information and communication technologies (ICTs) in extension delivery services is of great importance. This study examined personal characteristics of respondents, type of ICTs available, benefits of use of ICTs and constraints to use of ICTs among extension officers in Lagos State. Simple random sampling technique was used to select one hundred (100) Agricultural Extension Personnel from among the Extension agents employed in the State’s ministry of agriculture and cooperative. Structured questionnaire was used to obtain data from the respondents. Descriptive statistics such as frequency distribution, percentage and mean were used to present and summarize the data. Inferential statistics (chi-square and Pearson Product Moment Correlation) were used to describe the type of relationship that exists between the variables in the stated hypotheses. The mean age of the respondents was 39years. Fifty five (55%) were females, and 57% of respondents were B. Sc. holders. Majority (70.0%) were married and 64% were Christians. The mean job experience of the respondents was 16years. Availability of radio set rated high by majority (72%) while 91.0% of respondents had access to radio set. In provision of current information; television was rated high by majority (93%) while in contacting farmers, extension service delivery and improved production; mobile phone was rated high mostly (80%), (84%) and (78%), respectively. High access charge of internet was identified as constraint among majority (81%) of the respondents. Inferential statistics revealed a significant relationship between personal characteristics of respondents and use of ICTs such as age (X2 = 5.2003, P<0.05), religion (X2 = 3.822, P<0.05) are related, further result of correlation test of relationship between personal characteristics. Age (r = 0.183, P<0.05) and Educational level (r = 0.218, P<0.05) and use of ICTs were significantly related. Moreover, test of analysis showed significant relationship between type of ICTs available (r = 0.605, P<0.05) and use of ICTs. In conclusion, higher education level of respondents affected their use of ICTs and influenced by their age. Therefore, the development agencies/institutions involved in Agricultural extension programmes should be sincere and improve upon their efforts.

Kendali Radio Repeater Komunikasi Dua Meter Band Menggunakan Sistem Telekontrol Dual Tone Multi-Frequency

Repeater strongly supports the use of radio communication equipment for communication. The location of the repeater is usually at a high altitude so that the repeater's radio wave beam is not blocked by anything. The repeater arrangement is done by going directly to the repeater location so it is very inefficient from the time and accommodation factor. Therefore, a study was conducted to control the radio repeater settings remotely in order to reduce the accommodation of repeater control by visiting the radio repeater location. Control of radio repeater settings uses DTMF (Dual Tone Multi-Frequency) technology which sends DTMF signals and then converts them to binary data to be processed into data that is used for repeater control such as turning on and off the radio, setting high and low power, and adjusting channels on the repeater. the radio repeater. This system is also equipped with sending notifications in the form of SMS of the repeater operational conditions or settings. The research resulted in a remote control system based on DTMF technology equipped with a GSM/GPRS SIM800L module which is used to connect a smartphone to the system and send repeater operational notifications after controlling the repeater setting function. By using Telkomsel provider, the resulting delay when sending orders is 0.5 seconds and the delay in receiving SMS notifications is 12.96 seconds. Meanwhile, using Indosat provider, the resulting delay when sending commands is 0.43 seconds and the delay in receiving SMS notifications is 10.57 seconds.

The hybrid radio/X-ray correlation of the black hole transient MAXI J1348–630

ABSTRACT Black hole (BH) low mass X-ray binaries in their hard spectral state are found to display two different correlations between the radio emission from the compact jets and the X-ray emission from the inner accretion flow. Here, we present a large data set of quasi-simultaneous radio and X-ray observations of the recently discovered accreting BH MAXI J1348–630 during its 2019/2020 outburst. Our results span almost six orders of magnitude in X-ray luminosity, allowing us to probe the accretion–ejection coupling from the brightest to the faintest phases of the outburst. We find that MAXI J1348–630 belongs to the growing population of outliers at the highest observed luminosities. Interestingly, MAXI J1348–630 deviates from the outlier track at LX ≲ 7 × 1035(D/2.2 kpc)2 erg s−1 and ultimately rejoins the standard track at LX ≃ 1033(D/2.2 kpc)2 erg s−1, displaying a hybrid radio/X-ray correlation, observed only in a handful of sources. However, for MAXI J1348–630 these transitions happen at luminosities much lower than what observed for similar sources (at least an order of magnitude). We discuss the behaviour of MAXI J1348–630 in light of the currently proposed scenarios and highlight the importance of future deep monitorings of hybrid correlation sources, especially close to the transitions and in the low luminosity regime.

Fine-grained distributed averaging for large-scale radio interferometric measurement sets

The Square Kilometre Array (SKA) would be the world’s largest radio telescope with eventually over a square kilometre of collecting area. However, there are enormous challenges in its data processing. The use of modern distributed computing techniques to solve the problem of massive data processing in the SKA is one of the most important challenges. In this study, basing on the Dask distribution computational framework, and taking the visibility function integral processing as an example, we adopt a multi-level parallelism method to implement distributed averaging over time and channel. Dask Array was used to implement super large matrix or arrays with supported parallelism. To maximize the usage of memory, we further exploit the data parallelism provided by Dask that intelligently distributes the computational load across a network of computer agents and has a built-in fault tolerance mechanism. The validity of the proposed pattern was also verified by using the Common Astronomy Software Application (CASA), wherein we analyze the smearing effects on images reconstructed from different resolution visibilities.

Shared Spectrum Monitoring Using Deep Learning

Shared spectrum usage is inevitable due to the ongoing increase in wireless services and bandwidth requirements. Spectrum monitoring is a key enabler for efficient spectrum sharing by multiple radio access technologies (RATs). In this paper, we present signal classification using deep neural networks to identify various radio technologies and their associated interferences. We use Convolutional Neural Networks (CNN) to perform signal classification and employ six well-known CNN models to train for ten signal classes. These classes include LTE, Radar, WiFi and FBMC (Filter Bank Multicarrier) and their interference combinations, which include, LTE + Radar, LTE + WiFi, FBMC + Radar, FBMC + WiFi, WiFi + Radar and Noise. The CNN models include, AlexNet, VGG16, ResNet18, SqueezeNet, InceptionV3 and ResNet50. The radio signal data sets for training and testing of CNN-based classifiers are acquired using a USRP-based experimental setup. Extensive measurements of these radio technologies (LTE, WiFi, Radar and FBMC) are done over different locations and times to generate a robust dataset. We propose a novel (spectrogram) representation called the Quarter-spectrogram (Q-spectrogram) that squeezes temporal and frequency information for input to CNN models. While considering classification accuracy, model complexity and prediction time for a single input Q-spectrogram (image), ResNet18 (CNN model) gives the best overall performance with 98% classification accuracy. While SqueezeNet (CNN model) offers the lowest model complexity which makes it very suitable for resource-constrained radio monitoring devices and also offers the least prediction time of 110 msec. Moreover, we also propose a simple WiFi classification scheme that buffers several WiFi Q-spectrograms and then makes a decision about WiFi’s presence and also gives a quantified measure of WiFi traffic density.

Antenna radome based on metal-dielectric gratings as angular filter at microwaves

This article is devoted to the analysis of numerical study results of printed angular filters scattering characteristics. It is shown these angular filters may be used as antenna radomes. Numerical results are obtained by full-wave simulation of frequency-selective surfaces with dielectric covers. The numerical research results of the scattering characteristics of a printed angular filter as antenna radome based on metal-dielectric gratings are presented. A comprehensive numerical study of microwave angular filters based on multi-element multilayer printed reflect arrays has been carried out. Constructive solutions for metal-dielectric structures in integral design, realizing the functions of angular filters, are found. These solutions are based on performed numerical studies. The problems of constructive implementation of multilayer planar spatially selective as angular filters are considered. These angular filters are integrated into the radiators and feeders of modern multi-element printed phased arrays. The problems connected with creation of such arrays are also considered. The numerical simulation results for angular filters based on metal gratings with dielectric covers are obtained. These results can be used to select the most rational options for the topology of metal-dielectric gratings. Such solutions may be useful for design of multifunctional radomes in microwave antenna systems. Based on the obtained numerical data, the possibilities of using flat gratings as angular filters in the composition of antenna radomes are considered. The spatial frequency-selective structures proposed in this work are performed as multi-planar printed gratings. These gratings are designed to ensure electromagnetic compatibility of closely spaced radio electronic sets. These radio electronic sets operate in close frequency ranges. They contain antenna arrays. These arrays are placed under the antenna radomes. At the same time, the installation of angular filters in the antenna radomes makes it possible to eliminate the appearance of unwanted grating lobes in the radiation patterns of sparse antenna arrays of promising radioengineering sets at microwaves.

Frequency selective antenna radome based on metal-dielectric gratings and perforated screens

This article is devoted to the analysis of numerical study results of printed frequency selective surfaces scattering characteristics. It has been shown that these frequency selective surfaces may be used as antenna radomes. Numerical results have been obtained by full-wave simulation of frequency-selective surfaces with dielectric covers. The numerical research results of the scattering characteristics of printed frequency selective surfaces as antenna radomes based on metal-dielectric gratings and thick perforated screens have been presented. A comprehensive numerical study of microwave frequency selective surfaces based on multi-element multilayer printed reflectarrays and thick perforated screens has been carried out. Constructive solutions for metal-dielectric structures in integral design, realizing the functions of frequency selective surfaces, have been found. These solutions are based on performed numerical studies. The problems of constructive implementation of multilayer planar spatially selective as frequency selective surfaces have been considered. These frequency selective surfaces are integrated into radiation systems of modern multi-element printed phased arrays. The problems connected with creation of such arrays have been also considered. The numerical simulation results for frequency selective surfaces based on metal gratings with dielectric covers have been obtained. These results can be used to select the most rational options for the topology of metal-dielectric gratings. Such solutions may be useful for design of multifunctional radomes in microwave antenna systems. Based on the obtained numerical data, the possibilities of using flat gratings as frequency selective surfaces in the composition of antenna radomes have been considered. The spatial frequency-selective structures proposed in this work are performed as multi-planar printed gratings. These gratings are designed to ensure electromagnetic compatibility of closely spaced radio electronic sets. These radio electronic sets operate in close frequency ranges. They contain antenna arrays. These arrays are placed under the antenna radomes.

Model of on-line control for the smart object by communication technologies

Based on analysis of opportunities of usage existing models, methods and techniques for on-line monitoring and control of unmanned dynamic objects, a mathematical model of remote estimation of distance to wire-controlled unmanned mobile object is proposed. The presence of model and techniques of remote estimation of distance to wire-controlled unmanned object increases the reliability of control for exclusion of critical situations in the strict radio counteraction conditions and powerful electromagnetic jamming setting during control.

Practices of Broadcast Media Usage in The Age of New Media: Evidence From Uganda

The impact of new media is felt everywhere in the world and it has resulted to radical changes in the broadcast media in - dustry. The usage of new media has improved globally and African countries in particular have witnessed too the impact of new media. This study investigated practices of broadcast media usage in the age of convergent new media technologies and the impact of these patterns among the Ugandan youths. We employed both quantitative and qualitative methodologies. A total N=16 was interviewed and N=486 questionnaires were analyzed. All participants in this study were university students enrolled for the academic year 2019/2020 at two campuses, of the Islamic University in Uganda. Results show that mobile telephone is the most used tool of communication with an overall of 52.7% of the respondents spending more than 7 hours on telephone in a day. Yet 47.9% spent 1 to 3 hours watching TV daily. Radio was the least used media platforms as they spent less than one hour listening to radio. The study further exposed that 92.8% of the sample population possessed mobile pho - nes and listened to radio through it. The second most accessed and possessed device used in the reception of radio and TV was smartphones with 80.7% whereas TV sets were accessed by 70% of the informants and 69.1% revealed that they owned a radio set at their residence. The least accessed device were laptops and desktop where by only 47.7% accessed them. Pos - session of media devices was strongly correlated with the monthly income of the respondents, both at value P= .004 and P= .000 respectively. The study concluded that there is a paradigm shift in the usage of radio and TV from traditional reception to new media reception.

A Non-equipartition Shock Wave Traveling in a Dense Circumstellar Environment around SN 2020oi

Abstract We report the discovery and panchromatic follow-up observations of the young Type Ic supernova (SN Ic) SN 2020oi in M100, a grand-design spiral galaxy at a mere distance of 14 Mpc. We followed up with observations at radio, X-ray, and optical wavelengths from only a few days to several months after explosion. The optical behavior of the supernova is similar to those of other normal SNe Ic. The event was not detected in the X-ray band but our radio observations revealed a bright mJy source ( L ν ≈ 1.2 × 10 27 erg s − 1 Hz − 1 ). Given the relatively small number of stripped envelope SNe for which radio emission is detectable, we used this opportunity to perform a detailed analysis of the comprehensive radio data set we obtained. The radio-emitting electrons initially experience a phase of inverse Compton cooling, which leads to steepening of the spectral index of the radio emission. Our analysis of the cooling frequency points to a large deviation from equipartition at the level of ϵ e /ϵ B ≳ 200, similar to a few other cases of stripped envelope SNe. Our modeling of the radio data suggests that the shock wave driven by the SN ejecta into the circumstellar matter (CSM) is moving at ∼ 3 × 10 4 km s − 1 . Assuming a constant mass loss from the stellar progenitor, we find that the mass-loss rate is M ̇ ≈ 1.4 × 10 − 4 M ⊙ yr − 1 for an assumed wind velocity of 1000 km s − 1 . The temporal evolution of the radio emission suggests a radial CSM density structure steeper than the standard r −2.

Menstrual knowledge, sociocultural restrictions, and barriers to menstrual hygiene management in Ghana: Evidence from a multi-method survey among adolescent schoolgirls and schoolboys.

On a daily basis, schoolgirls in low and middle-income countries discover blood on their clothing for the first time in school environments without toilets, water, or a supportive teacher, mentor, or role model to help them understand the changes happening in their bodies. This study aimed to examine the menstrual knowledge, sociocultural restrictions, and barriers to menstrual hygiene management in school environment among adolescent schoolgirls in a rural community. We collected quantitative data from 250 adolescent schoolgirls and qualitative data from thirty schoolboys and five schoolteachers in five Junior High Schools in the Kumbungu district of northern Ghana. Binary logistic regression models were fitted to determine the predictors of poor menstrual knowledge. Qualitative data were transcribed verbatim, coded, and organized into themes. Overall, 53.6% of the girls had poor knowledge about menstruation. Most of the boys had heard about menstruation and had an idea about what menstruation is with most of them describing it as “the flow of blood through the vagina of a female.” The boys revealed that terms such as “Vodafone,” “Red card,” and “Palm oil” are used to describe menstruation in the schools and within the community. After adjusting for the effect of other sociodemographic factors, we found evidence that girls in their late adolescents were less likely to have poor menstrual knowledge compared to those aged 10–14 years (aOR 0.20, 95%CI 0.08–0.48). Maternal education was protective against poor menstrual knowledge. When compared to adolescents whose mothers were illiterates, those whose mothers had basic education (aOR 0.62, 95%CI 0.28–1.40) and those whose mothers had secondary or higher education (AOR 0.22, 95%CI 0.06–0.76) were less likely to have poor knowledge about menstruation. Adolescents from homes with no television and radio sets were more likely to have poor menstrual knowledge compared to those from homes with television and radio sets (aOR 2.42, 95%CI 1.41–4.15). Comfort, safety, and cost were the major factors that influenced their choice of sanitary products. Most of the teachers said the schools do not provide students with sanitary products, even in emergencies. We found that girls were not to prepare some local dishes (e.g. Wasawasa) during their periods and are forbidden from participating in religious activities (i.e. read the Holy Quran or pray in the mosque) during the period of menstruation. Open discussions about menstruation and its management are not encouraged and girls are considered unclean and impure during the period of menstruation. None of the schools had a regular supply of water in WASH facilities, a mirror for girls to check their uniforms for bloodstains or soap in the toilet facilities for handwashing. Menstrual education through the standard school curriculum, starting from primary school, could prepare girls for menarche, improve their knowledge on menstruation, and teach boys how to support girls and women during the period of menstruation. This could also eliminate the sociocultural misconceptions surrounding menstruation.

Past forward

Summary form only given, as follows. The SCR-536 Handie-Talkie was designed for operation under battle conditions," according to its technical manual. An ad for the World War II handheld radio set, a direct ancestor of modern-day walkie-talkies, featured a soldier’s endorsement: "Just like having a house telephone at your fingertips. We're never alone. We feel safer, stronger, because we’re always in touch with our command post!” Years later, though, a retired Army officer who used the radio during the Allied invasion of North Africa in November 1942 offered a less enthusiastic review: "In our amphibious landing in North Africa … it leaked water - and salt water ruined the sliding switch contacts." Users could be hard on the 536, he added: "One set came into our shop…with all the tubes dead. Some infantryman had used it to pound in tent pegs!"

Radio Republic of Iraq and Awareness Promoting of Minorities’ Rights

بدأت طروحات نشر الوعي بحقوق الأقليات وتأمين الحريات لهم تأخذ اهتماماً دولياً متصاعداً، لاسيما بعد تزايد أثر الحروب والصراعات على أوضاع تلك الأقليات، وتشدد (اليونسكو) على ضرورة ان تولي سياسات الإعلام والاتصال عناية أكبر بحماية حقوق الأقليات. ومن هنا تأتي أهمية بحثنا، الذي تكمن مشكلته في التساؤل الرئيس: (ما دور إذاعة جمهورية العراق في تسويق الوعي بحقوق الأقليات على الصعيد الاجتماعي العام؟)، بوصفها إحدى وسائل شبكة الإعلام العراقي، والتي تلزمها القوانين النافذة بان تهتم بحقوق الأقليات ونشر ثقافة التعددية والتنوع وقبول الآخر في المجتمع المحلي. وقد عمد الباحث على تصميم استمارة الاستبيان في دراسته المسحية للعاملين في الإذاعة، على وفق محاور ركزت على آليات التخطيط البرامجي في إذاعة جمهورية العراق، ومعالجة الإذاعة للقضايا الهامة على الصعيد الاجتماعي، ودور الإذاعة في تسويق الوعي بحقوق الأقليات، وقد كان من بين الاستنتاجات التي تواصل إليها: تتناول إذاعة جمهورية العراق القضايا المرتبطة بالأقليات ضمن سياقها الإعلامي العام، ولا تعتمد استراتيجيات محددة لتسويق الوعي بحقوقهم. تضع الإذاعة خططها البرامجية على وفق سياسات شبكة الإعلام العراقي واقتراحات بعض منتسبيها، الأمر الذي يُنتج تكراراً للمضامين الرئيسة للدورات البرامجية فيها. تؤثر بعض الضغوط في تناول الأحداث المرتبطة بالأقليات في العراق، ومن بينها اتجاهات العاملين في الإذاعة ومواقفهم الشخصية من شرائح معينة من تلك الأقليات.

Bacteriological Analysis of Top Soil from an Electronic Waste Dumpsite in Port Harcourt Metropolis

Aim: To determine the bacterial and physicochemical analysis of topsoil from an electronic waste (e-waste) dumpsite within Port Harcourt metropolis using standard procedures.
 Place and Duration of Study: The study area was Kaduna street, beside Fruit and Vegetable Garden Market, Mile l which is located in Port Harcourt, Rivers State, Nigeria. The coordinates are 4o47’57.5” N 7o00’02.7” E. The duration of study was between March and September, 2019.
 Methodology: The waste disposed were mainly television sets, computer monitors, radio sets, stoves, laptops and central processing units. Soil samples were cleared off top debris, collected within 5cm of the top soil from four (4) different points of the dumpsite and a control was collected from area devoid of waste disposal, 20m away from the dumpsite. The five samples were kept in clean sterile polythene bags. Contamination observed from soil samples was attributed to the waste disposal. The total heterotrophic bacterial count was performed using l gram of soil from e-waste dumpsite in a 9-fold serial dilution using a spread plate method, in duplicates on dried nutrient agar plates and incubated at 30°C for 24hours. Centrimide agar plates were used to obtain Pseudomonas isolates and incubated at 37°C for 24 hours while MacConkey agar plates were used to isolate coliform bacteria, incubated at 0c for 48 hours. The physicochemical parameters were determined using standard methods.
 Results: Seven (7) bacterial genera were isolated from the topsoil of the e-waste dumpsite and they were Staphylococcus, Pseudomonas, Kluyvera, Bacillus, Micrococcus, Chromobacterium and Pectobacteria species. Staphylococcus spp. had the highest percentage composition of 42.3% and Kluyvera spp, the lowest percentage composition of l.9% of bacterial isolates found in the topsoil of the electronic waste dumpsite. The total heterotrophic bacterial count ranged from l.30 x l06 to l.97 x l06 cfu/g, total coliform count was 3.05 x l03 to 7.98 x l03 cfu/g and total Pseudomonas count ranged from l.00 x l02 to 2.88 x l03 cfu/g with a significant difference at .05 probability level to the control samples. The temperature ranged from 27.67±0.580C to 28.00±l.000C with a control of 29.00±l.000C, pH value ranged from 6.33±0.58 with a control of 7.00±0.00. The pH values were lower than the control indicating that the soil was slightly acidic to neutral. Moisture content had 4% with a control of 2.7%, an organic matter of l7.33±0.58 with a control of 4.47±0.58.
 Conclusion: The presence of the isolated organisms could cause public health risk or environmental hazard. Proper education and legislations on handling of e-waste in the society should be intensified to forestall waste related problems along the food chain.