quarta-feira, 17 de setembro de 2014
DIY Antena Discone para RTLSDR - Parte 1
Para fazer chegar melhor sinal RF ao dongle SDR que comprei no ebay.co.uk, encontrei esta antena a Discone, que segundo o seu autor, abrange desde os 60MHz até aos 1700Mhz, o que para esta primeira fase dá e sobra.
O PDF esquema pode ser encontrado no site do autor aqui.
Brevemente colocarei fotos da construção da minha num próximo post.
sexta-feira, 12 de setembro de 2014
USB DVB-T & RTL-SDR Realtek RTL2832U & R820T DVB-T Tuner Receiver MCX Input T5
Acabadinho de chegar o dongle SDR-USB para receber os satélites NOAA, em breve darei mais notícias sobre o assunto.
terça-feira, 9 de setembro de 2014
Kit frequencímetro 0.1-60MHz e 20MHz-2.4GHz - Parte 1
Chegou hoje o kit montado de frequencímetro que comprei no ebay.co.uk.
Em breve irei montá-lo em conjunto com o meu president.
As características em inglês:
With Microchip's PIC16F648A, 2.4 GHz frequency meter.
Em breve irei montá-lo em conjunto com o meu president.
As características em inglês:
With Microchip's PIC16F648A, 2.4 GHz frequency meter.
Using temperature-compensated voltage controlled crystal oscillator (2.5 ppm VC-TCXO).
Unique gate control and precise time algorithm (non-timed interrupt).
Gate (display refresh) time 0.01 seconds / 0.1 seconds / 1.0 seconds, real-time display frequency value.
Single-ended input design, three-channel frequency measurement (low channel / high channel / Auto Channel).
Dual frequency design, value and IF / down mode can be preset separately.
Using eight 0.56 inches high brightness digital display, eight adjustable brightness.
Circuit is simple and reasonable structure, two-button control, simple operation.
The settings are automatically saved, boot directly call.
Descriptions:
1. Gate time
0.01 secs
0.10 secs
1.0 secs
2 Measurement channels (channels are low impedance)
low channel
Measuring range: 0.1 MHz ~ 60 MHz
Accuracy: ± 100Hz (0.01 1s gate time)
± 10Hz (0.1 seconds gate)
± 1Hz (1.0 seconds when the gate)
Low channel sensitivity:
0.1 MHz ~ 10 MHz: better than 60mVPP
10 MHz ~ 60 MHz: better than 60mVPP
60 MHz ~ 75 MHz: Not tested
high channel (divided by 64)
Measuring range: 20 MHz ~ 2.4 GHz
Accuracy: ± 6400Hz (0.01 seconds gate)
± 640Hz (0.1 1s gate time)
± 64Hz (1.0 1s gate time)
High channel sensitivity:
20 MHz ~ 30 MHz: better than 100mVPP
30 MHz ~ 60 MHz: better than 50mVPP
60 MHz ~ 2.4GHz: not tested
Auto Channel
Automatically selected according to the input signal frequency high or low channel channel, identifying the frequency of 60 MHz. Such as when the input signal amplitude is greater than 60 MHz shortage can not automatically select high channel, the channel should manually select high frequency measurement.
3,IF settings
Independent double-IF design, adjust the minimum frequency step of 100 Hz, frequency range 0 ~ 99.9999 MHz, can be set to increase or decrease the IF frequency mode.
4. Frequency reference
Using 5032 package 13.000MHz Warming voltage controlled crystal oscillator (VC-TCXO), frequency stability of ± 2.5 ppm.
5. Operating voltage
DC Input: DC 9V ~ 15V (with reverse polarity protection)
6 Current
Maximum 160 mA (test conditions: ① DC12V power supply; ② red LED; ③ eight brightness)
7. Eight LED display, the highest display eight digits.
8. Eight LED brightness is adjustable, factory set to maximum brightness.
9. Physical Dimensions,Length × width × height: 125.5 mm × 25.5 mm × 21.5 mm
10. Component quality 46 g (NW)
11. Onboard Interface
DC IN (Power Interface): HX2.54-2P socket
RF IN (signal input): HX2.54-2P socket
ICSP (programming interface): 2.54-6P Pin
Unique gate control and precise time algorithm (non-timed interrupt).
Gate (display refresh) time 0.01 seconds / 0.1 seconds / 1.0 seconds, real-time display frequency value.
Single-ended input design, three-channel frequency measurement (low channel / high channel / Auto Channel).
Dual frequency design, value and IF / down mode can be preset separately.
Using eight 0.56 inches high brightness digital display, eight adjustable brightness.
Circuit is simple and reasonable structure, two-button control, simple operation.
The settings are automatically saved, boot directly call.
Descriptions:
1. Gate time
0.01 secs
0.10 secs
1.0 secs
2 Measurement channels (channels are low impedance)
low channel
Measuring range: 0.1 MHz ~ 60 MHz
Accuracy: ± 100Hz (0.01 1s gate time)
± 10Hz (0.1 seconds gate)
± 1Hz (1.0 seconds when the gate)
Low channel sensitivity:
0.1 MHz ~ 10 MHz: better than 60mVPP
10 MHz ~ 60 MHz: better than 60mVPP
60 MHz ~ 75 MHz: Not tested
high channel (divided by 64)
Measuring range: 20 MHz ~ 2.4 GHz
Accuracy: ± 6400Hz (0.01 seconds gate)
± 640Hz (0.1 1s gate time)
± 64Hz (1.0 1s gate time)
High channel sensitivity:
20 MHz ~ 30 MHz: better than 100mVPP
30 MHz ~ 60 MHz: better than 50mVPP
60 MHz ~ 2.4GHz: not tested
Auto Channel
Automatically selected according to the input signal frequency high or low channel channel, identifying the frequency of 60 MHz. Such as when the input signal amplitude is greater than 60 MHz shortage can not automatically select high channel, the channel should manually select high frequency measurement.
3,IF settings
Independent double-IF design, adjust the minimum frequency step of 100 Hz, frequency range 0 ~ 99.9999 MHz, can be set to increase or decrease the IF frequency mode.
4. Frequency reference
Using 5032 package 13.000MHz Warming voltage controlled crystal oscillator (VC-TCXO), frequency stability of ± 2.5 ppm.
5. Operating voltage
DC Input: DC 9V ~ 15V (with reverse polarity protection)
6 Current
Maximum 160 mA (test conditions: ① DC12V power supply; ② red LED; ③ eight brightness)
7. Eight LED display, the highest display eight digits.
8. Eight LED brightness is adjustable, factory set to maximum brightness.
9. Physical Dimensions,Length × width × height: 125.5 mm × 25.5 mm × 21.5 mm
10. Component quality 46 g (NW)
11. Onboard Interface
DC IN (Power Interface): HX2.54-2P socket
RF IN (signal input): HX2.54-2P socket
ICSP (programming interface): 2.54-6P Pin
Package included :
100% Brand New High Quality
1 x Blue 0.1-60MHz 20MHz ~ 2.4GHz RF Singal Frequency Counter Cymometer Tester Meter
100% Brand New High Quality
1 x Blue 0.1-60MHz 20MHz ~ 2.4GHz RF Singal Frequency Counter Cymometer Tester Meter
quarta-feira, 3 de setembro de 2014
Antena Astroplane - Construção - Parte 1
Não estando insatisfeito com a minha Passo em Frente, sinto que necessito de algo mais, surgiu-me a ideia de construir a Antena Astroplane.
Esta antena uma boa largura de banda, tem baixo SWR quando bem feito e de acordo com as especificações, e fácil de montar tendo apenas cerca de 78 cm de diâmetro no anel e apenas 365 cm de altura.
Irei utilizar o mastro já existente da passo em frente.
Depois de umas buscas na internet encontrei o plano de construção.
Brevemente irei iniciar a sua construção.
Fonte: http://www.deepsouthradios.com/forum/homebrewed-antennas/21887-homebrew-astroplane.html
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