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45 Threads found on edaboard.com: Uhf Transmitter
Hi , Guys I have uhf FM transmitter with power about 5W I want it to send video signal through AM the carrier frequency here the important section of schematic : 135260 I tried to inject signal in Q407 emitter ( i think this make low level AM ) after remove R408 the picture shows up in my TV with lot of noise and
you are talking about transmitter. But i was referring to the power generates in TV antenna at the receiver for uhf and VHF. Should say you are thinking of receiver antennas but didn't actually tell that. Minimal Voltage, current and power range can be estimated from TV tuner sensitivity numbers. Something like 100 ?V shou
Hello, I need your suggestion on the next: For a cubesat project I was told to suggest an RF transceiver for the communications system. The specs are: 1. The uplink should be around 146MHz and the downlink around 433MHz. 2. To match the already purchased 9600kbps FSK modem, the transmitter oscillator must use a crystal and a varactor
The world spreads more and more between modern countries and old countries. In North America we don't use NTSC TV anymore since all TV transmission is uhf digital high definition today. I bet the TVs in the old countries still have a cathode ray tube as the display.
We used loads like this in kit installed in 1972 for a 50 ohm 15 KW load for a uhf transmitter. It was a tank about 1m diam by about 4 m high with a bit of 50 ohm coaxial cable as its input connector, which attached to a solid copper tube coax inside the tank. The water had Glaubers salt added to it to make it a good 50 ohms. In use the water would
hi all, i need to send data through wireless channel. for this task i have selected the uhf transmitter and receiver. but now can anyone tell me that how to give input to the transmitter. i have to send two bits, which is simple integers. thank you in advance.
Hi all, i want to send data which is a number(specific) and state description like on or off, which will send by a number of transmitter, so it is good to use a single receiver or i should use different for each one. now other problem is, what should be the format of data, i want to send. third one is, if i use a uhf transmitter an
Dear all i have a problem with tunning of a band pass cavity filter using in DVBT transmitter. it's a 6 pole uhf (Com-Tech CL6X30C) filter and i'm completely confused with this much tunning parameters, 6 pole positions, input/output ports positions, their angles, etc. does anyone know any specific procedure to tune this kind of filters?
Hello I have found this I have also managed to find an altered version of it from an old magazine which I attach. Does anyone have more info on the original circuit? Where it has been published, or any construction details? Also what if someone wants to
what pins do i connect at the back of two gm340 motorola radios to make a repeater how do i tell one to be a receiver and the other to be a transmitter can i put the receiver radio on scan so as to repeat more than one freq at a time and can i still use one of these two radios as a normal base radio by connecting a mic and also still hearin
1- TV are in VHF and uhf bands so, the EMC is less annoying than others HF technologies. 2- Sorry, above my knowledge.
Using amplifiers is possible but it adds to interference. Why don't you try to use an antenna? The low-power systems like yours have only short whip or dielectric antennas on transmitter and receiver. If you try a small Yagi like that used for uhf TV, you could direct the RF power where your receiver stands, and limit interference, too. If your dev
anyone have a schematic for the old "TV Genie" a TV sender with 500mW output power. Here on ebay, but i'm out of US for buying!:-(
hello, im new here and its very nice community... i wannt build uhf transmitter and Receiver, for voice video... how much would its cost?? and there is schematic for build it? and it can be digital that no one else can listen to this, but me?? thx.
Is it any FM Module solution capable to work in uhf range (400-500 MHz) is it possible to recieve 16 channels simultaneously?
RFMD,RF2514,I want to know how to change the frequency? The DT said ,It can fine-tuned via internal varactor diodes, but when I change the voltage of Pin10, the frequency didn't change,,,,,who can help me??thanks
Hi! Help to decide please following problem. The preamplifier for DVB the transmitter on BLF2045 is developed. Amplitude-frequency characteristic unevenness nearby 1 dB, VSWR 1,5). Problem with level intermodulation distortion - 30 dB (a compression point - more 1 dB). How it is possible to increase intermodulation distortion?
Hi I have 2 questions about a monostatic (single antenna) uhf RFID system. For example: (1) If I have an antenna with 20 dB return loss and the output power of the transmitter is 30 dBm, then only +20 dBm will be radiated. If the desired radiation power of the antenna is +30dBm (no EIRP), then the output power of the transmitter has to (...)
Hello All, Out of interest and for the sake of my own learning, I have been trying to design a uhf transmitter. The good news is, with my latest design I have achieved lock. The bad news is that although I may have achieved lock, the output frequency is slighlty off the desired frequency and I am unable to view the de
It depends if it's big enough to hold a transmitter, if it will be inserted in place and the patient will close mouth, thus shieding the transmitter. If a portion of the device remains outside, it's quite easy, use a small transmitter in uhf ISM band with batteries or a SoC that has ADC, programmed for the job. Also (...)
This TV transmitter circuit should work fine, I remember I?ve built something similar years ago. The DC voltage on base of Q4 should be zero, because this works in Class C and the transistor is DC biased by the incoming RF signal. Check if Q3 is oscillating, looking for signal in uhf TV band. The DC supply in the collector of Q4 is AM modulated b
hello i want to design vhf/uhf fm there any software?or pls name some books or links on this topic.pls help me.
Hi A little late but the chip is made by MELEXIS. Part number TH72011. uhf FSK chip Melexis: Hall-effect Position Sensors | Sensorless BLDC Motor Drivers
I had a small voice transmitter on the 433MHz band, build around an SMD IC (8 leads) and an SMD crystal - as I remember 12-13MHz. I'm trying to find any details of this IC - but all ICs I find (from Maxim for example) are ASK/FSK ICs. I've tried to google it without success. Any ideas? TIA, Nina
Hi,... If you are not strictly limited to PIC16F777, then you can use the PIC12F675. It contains a built-in ASK/FSK uhf transmitter/receiver. You can also find code samples at Hope this helps.
The RF system operates in uhf band (50MHz-850MHz). I have designed a transmitter using quadrature modulator AD8345 and it works well. Now I want to design a quadrature demodulator. The AD8348 is a natural choose. However, AD8348 needs 2xLO input. For instance, if the frequency of the input RF signal is 700MHz, we must give a 1400MHz LO signal f
Hi. I looked every where in the internet but I couldn't find a uhf transmitter. If it had a range of 500Km it would be great.
Hi all, I have to design a workbench to evaluate possible interferences (co-channel, adj channel, ecc.) on a digital TV transmitter. Of course, these interferences could be caused by other digital or analog transmitters, the band is uhf. I also have to perform post-analysis on the data collected. Is there anybody expert in the (...)
Dear Friends, Have anyone designed AM uhf transmitter and receiver which based on 409MHz carrier frequency by discrete component? Can you share you experience? Or can you provide reference circuit? Thank you very much!! Best Regards, Peter
HI all! Have to test performances of a uhf transmitter (Digital TV transmitter). Can anybody suggest procedures, instrumentation, measure bench, everything useful... thanks in advance, ciao
TDA8722 is an analog video/audio modulator (using AM for video and FM for audio). The output uhf signal can be received with any standard TV set. Another option for transmitting video signal is to use FM modulation for video signal. This is used by the old analog satellite transmissions DBS, or by FM ATV (Amateur TV).
Try This module - Very small and suitable with Battery source - Embedded with uhf antenna, so easy to use, too
any body can help me to build tv antenna for uhf band or any link where i can download it, thank you
Hi every body. I need to design a BPSK transmitter for uhf band. (Modulator, Mixer, Osc and HPA). Can you help me? Thanx.
Hi, I need a datasheet for a Philips BGY23 RF module used in a low power commercial transmitter. Tnx in advance. 73 Chipslicer
I WANT IRCUIT DIAGRAM PCB LAY OUT OF VIDEO transmitter 10 WATTS. HELP ME ABOUT THIS. uhf 700 TO 860 MHZ FREQUENCY. THNKS
Anybody knows how to make Studio to transmitter Link (STL)?Please give idea to the way the frequency should be at uhf.
Professional Wireless Microphone Systems use uncrowded uhf Band (692 - 722 MHz) and it is probably pssible to re-tune them to 900MHz band. "Domestic" wireless microphones in most cases operate somewhere around 170MHz and this is just to low to "modify" them for 900MHz ..
Practical solution about uhf transmitter hi there, It's my transmitter illustrated in attached jpg file. I have some doubts in antenna matching. it's appreciated that anyone can help me. 1. I have no network analyzer in hands for the moment. 2. the freq. of transmitter is 863-864Mhz (wireless phone for Europe (...)
Thank you again for this.. If you look at the obsolete / last buy list of the Motorola range, you'll discover that all their 'low' frequency Rx have been can. here is an extract of what is not to be considered as existing part: MC13055 IF, up to 1.0 MHz MC13145 uhf Receiver. For ISM band MC13146 Lo pwr transmitter. For ISM band MC13155 FM
hello please introduce the manufacture of 50-100W fm uhf transmitter/receiver modules that have high quality. or if you a circuit sch about this I need it. It should have the capability to change its frequency by embedded software. bye
Hello friends, I am trying to design transmitter & Receiver which they satisfy 1km range for remot controlling, also i want the transmitter size is as small as possible to fit in embedded system. About me it is ok to use VHF or uhf bands, so can anyone advice me for schematic circuit or ready modules?? Also, please advice me about the (...)
Hi there Our community is looking to set up a 24hour uhf TV transmitter. Transmission frequency has not been worked out yet. That will be sorted out with the authorities later. What we need to know is for a range of about 50km radius what type of transmitter would be required? That is at what power (watts) do we need to transmit to (...)
RFPROP OS Win98/ME/NT4/2000 Description: This is a Windows propagation calculator for the transmission path between an RF transmitter and a receiver. It is aimed mainly at free-space and space-wave applications, such as are encountered in VHF, uhf and microwave communications, and also in satellite communications.
RFPROP Version 1.03 A Windows propagation calculator for the transmission path between an RF transmitter and a receiver. It is aimed mainly at free-space and space-wave applications, such as are encountered in VHF, uhf and microwave communications, and also in satellite communications. Updated June 24 1998.


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