1000 Threads found on edaboard.com: 137 Mhz
if any one have good quality recever for that can receve arround 137 mhz frequency please put here or email two .if it tested one its going to make weather sat picture recever
Hobby Circuits and Small Projects Problems :: 03-14-2008 20:19 :: sankalani2003 :: Replies: 1 :: Views: 2081
im will design LNA for weather satellite (137 mhz)..if i googling in the web it many design of this LNA...and mostly is only single stage and common-source configuration...
why it doesnt design by differential or cascode....
is it any advantages or disadvantages of both model...?
i have been read in wikipedia that cascode i
RF, Microwave, Antennas and Optics :: 05-02-2009 10:47 :: ozenk :: Replies: 0 :: Views: 1130
I'm looking to try to make an antenna to cover the range 118-137 mhz. The constraints are basically
diameter < 20 mm.
Length, certainly less than 700 mm, but even that might not be possible. I think something in the range 300-500 mm is more likely to be acceptable
SWR < 2:1.
Power handling 20 W.
Fed at the base - it can't be centre fed.
RF, Microwave, Antennas and Optics :: 11-16-2011 18:26 :: drkirkby :: Replies: 8 :: Views: 2014
QHA is designed for 137 mhz frequency in cst.simulation result shown the s11 paremeter at 480mhz.but the radiation pattern comes good at 137mhz.how to get return loss at 137mhz
give me suggestions on how to feed an qha antenna?reply me my design feed port is defined at the (...)
RF, Microwave, Antennas and Optics :: 07-08-2013 01:55 :: v.mekaladevi :: Replies: 0 :: Views: 321
you said that it is difficult to generate 2 mhz.but your parameter gives 3.137 mhz.will it be stable and good working.
Analog Circuit Design :: 08-23-2013 06:12 :: rakirajueee08 :: Replies: 5 :: Views: 280
I´m trying to modify a Philips SAA7215HS with an SDI (Serial Digital Interface) output. Pins 128, 131-137 are data lines and the pin 126 is the 27 mhz clock to sync the signal.
I have noise in the sync line and need to "clean it". I have try a 100ohm resistor in sync line and a 27-47cp Cap. from ground to sync but doesn´t work.
Digital Signal Processing :: 01-17-2004 07:05 :: nachin :: Replies: 2 :: Views: 2478
What package is the best for 915 mhz antenna design?
Please don't reply unless you have useful information to add on this post.Thanks.
RF, Microwave, Antennas and Optics :: 02-09-2002 09:57 :: :: Replies: 9 :: Views: 3149
i'am searching a low cost long range transmitter for the European 8xx mhz band.
Should work from 400m to 800m outside.
Some good informations ??
Professional Hardware and Electronics Design :: 02-28-2002 17:34 :: mc_eddy :: Replies: 17 :: Views: 5375
This website gives you a full explanation on how to design a Digital Oscilloscope. All circuits and software is included - Tip: This design includes a few hectic sampling circuits, but if you'r only interested in building a normal scope, just look at the PIC16F84 and sheet 4 of the scematics - the rest of the circuit can be disgarded. Just take tim
Other Design :: 03-04-2002 03:11 :: prspies :: Replies: 12 :: Views: 10782
Anyone can help find such design , with PCB layout ? Tried searching but nothing worth .....
P.S. low power 100 m. will be more than enough
Thank's for the help
RF, Microwave, Antennas and Optics :: 07-12-2002 05:19 :: _Saulius_ :: Replies: 17 :: Views: 18520
I'm looking for a good schematic of FM AV modulator (VCO)
in band 900 - 1800 mhz for ATV modulator ..
Can someone help me ?
Professional Hardware and Electronics Design :: 07-26-2002 16:10 :: scum :: Replies: 1 :: Views: 1586
Thank you to all people who gave very interesting links.
Now any one wants to go over 100 metres ?
I am looking for 100 mW.. 1 Watt 433 mhz..
Any help in the right direction will be very appreciated.
Thank you in advance.
RF, Microwave, Antennas and Optics :: 08-02-2002 12:24 :: henrik2000 :: Replies: 9 :: Views: 3828
I need to change the output clock from default to 8mhz, to clock AT90S8515. But sometimes(after RESET button pushed) this freq is more than 8 mhz...
Well, can i do smth to stop this bug.
Professional Hardware and Electronics Design :: 09-22-2002 08:19 :: PILOTIK :: Replies: 0 :: Views: 748
I'm looking a very simple schematics about TX and RX circuits for 49 mhz.
This circuits must have a crystal to lock the transmission frequency and lock the reciever.
Thanks a lot!
RF, Microwave, Antennas and Optics :: 09-26-2002 19:04 :: rampo :: Replies: 0 :: Views: 1633
I designed and simulated a 120 mhz (BW3db=21 mhz) bandpass filter with ciolcraft and temex s-parameters files, but when i made the PCB, the response of the filter was quite different from the one i obtained during the simulation with microwave office.
Have i made a bad simulation?Should i rely on the s-parametres from coilcraft and temex?
Professional Hardware and Electronics Design :: 09-30-2002 04:45 :: davicente :: Replies: 6 :: Views: 2533
anyone knows a simple way how to divide frequency by 3 ?
The whole problem is as follows...
I have a TTL compatible signal with the frequency of 10 mhz. I need to multiply the frequency by 3, because I need 30 mhz as an input to AD9851 DDS chip.
So, I designed a simple PLL multiplier (NE564) and I need "divide by 3" circuit in th
Professional Hardware and Electronics Design :: 10-01-2002 21:41 :: CADDevil :: Replies: 9 :: Views: 3376
I want to announce cc1010 rf transceiver chip with integrated microcontroller
300-1000 mhz RF Transceiver
?Very low current consumption
?High sensitivity (typically -107 dBm)
?Programmable output power up to +10 dBm
?Data rate up to 76.8 kbit/s
?Very few external components
?Fast PLL settling allowing frequency hopping proto
RF, Microwave, Antennas and Optics :: 11-29-2002 18:00 :: bumerang :: Replies: 0 :: Views: 2221
can anybody tell me if there are any antenna design tools availbale for PCB or simple antennas for 868 915 mhz bands. or does any body have a design for good omin directional antenna's for these bands
RF, Microwave, Antennas and Optics :: 11-30-2002 04:14 :: beano040461 :: Replies: 135 :: Views: 37108
monopole style pattern
planar 2.5" x 3.5" max
tuning done on same plane as antenna
so far i have not been anywhere near this goal
i have no polarization purity
or monopole pattern for that matter
ive tried several loop styles
with different tuning methods
i realize ground plane size is a severe short
RF, Microwave, Antennas and Optics :: 02-22-2003 11:47 :: ghb :: Replies: 6 :: Views: 2142
Hi, i would like to built a power amp. for 1200 mhz. i normally work AO40, and I like work the uplink in 1200 mhz. The people tell me with 2 m57762 hibryd mitsubishi 40 w. in 1200 mhz, But I don´t found the schema. Please I looking for schema for 40 w, or 80 w in 1200, please help me. Thank you very much.
regards from IL18 (...)
RF, Microwave, Antennas and Optics :: 02-26-2003 19:59 :: AGUERE :: Replies: 1 :: Views: 1328
Hello, please tell me what I built a power meter for 1269 mhz. The max power is 50 w. Thank you very much. The amp. have two m57762 hybrid
RF, Microwave, Antennas and Optics :: 04-18-2003 16:12 :: AGUERE :: Replies: 0 :: Views: 807
I tapped a clock from a chip (50) mhz ,found it to be almost a sinusoidal waveform
Can it be because of loading .
Correct me if i am wrong
ASIC Design Methodologies and Tools (Digital) :: 05-14-2003 03:59 :: harshad :: Replies: 2 :: Views: 1028
8) Has Someone detailed Information for 27 mhz EH-Antenna???
Hobby Circuits and Small Projects Problems :: 05-30-2003 20:48 :: powerm :: Replies: 10 :: Views: 3167
where is the FM PLL (88 mhz - 108 mhz) with pic 16F8XX sch or asm code
RF, Microwave, Antennas and Optics :: 06-27-2003 19:27 :: dream42 :: Replies: 4 :: Views: 5146
kindly provide me circuit design guidance for 433 mhz ISM band transmitter/receiver for FM /ASK/FSK
Hobby Circuits and Small Projects Problems :: 09-10-2003 08:48 :: venus :: Replies: 6 :: Views: 3820
can sombody help? i want to design a directional coupler at 27mhz. power 50 watts. directivity 20 db or better.
thanks in advance
RF, Microwave, Antennas and Optics :: 09-11-2003 08:51 :: venus :: Replies: 6 :: Views: 2931
The operating voltage of ATmega8L is 2.7V to 5.5V, speed is 8mhz,
while operating voltage of ATmega8 is 4.5V to 5.5V, speed is 16mhz.
Does that means ATmega8L's low speed is specified for 2.7V and can be saftly raised to 16mhz if using 5.5V operating voltage?
Microcontrollers :: 10-18-2003 23:12 :: Epegic :: Replies: 9 :: Views: 7252
Would you please give me a suggestion
I need to design an ASIC which must has a 32 bit CPU( I hope it is royalty free) and an 80 mhz DAC(for video RGB, 5 bits resolution).
Would somebody can tell me which ASIC vendor has such IPs, I prefer
the Embedded gatearray ASIC, not standard cell.
ASIC Design Methodologies and Tools (Digital) :: 10-30-2003 21:53 :: john5888 :: Replies: 2 :: Views: 982
I would like to migrate from 16F84 to 16C628 for the extra pins available, but am not able to find any data of Osc accuracy or stabilty in internal 4 mhz mode. I tend to use serial comms up to 2400, and am a bit concerned about long term performance. Any experiences most welcome.
Microcontrollers :: 11-03-2003 09:51 :: GrandAlf :: Replies: 4 :: Views: 1784
Where can i find example of design of duplex filter for bands 1030 and 1090 mhz , please ?
RF, Microwave, Antennas and Optics :: 12-14-2003 11:01 :: FOX :: Replies: 4 :: Views: 1606
I have a 54 mhz double-speed multiplexed D1 video interface.
I need to split it into two separate channels : each a standard CCIR656 @ 27 mhz.
Did anybody had the same problem and solved it?
Are there any available Opencores or IPs for such a task?
PLD, SPLD, GAL, CPLD, FPGA Design :: 01-04-2004 11:59 :: spktu :: Replies: 10 :: Views: 1488
I need to construct an RF signal generator from 800 to 1900 mhz
Any ideas? any schematics?
RF, Microwave, Antennas and Optics :: 02-22-2004 08:21 :: Leosedf :: Replies: 12 :: Views: 4508
hi all friends
Any1 could help me in design of a 2 mhz Sin oscillator for driving a piezoelectric transducer needs about 20V p-p swing.
thanx a lot
RF, Microwave, Antennas and Optics :: 03-15-2004 18:12 :: tavakoli :: Replies: 1 :: Views: 1370
We wish to make 75 ohm RF detector for testing VHF-UHF small signal amplifiers. Pl. guide me in the matter.
RF, Microwave, Antennas and Optics :: 03-19-2004 06:05 :: palesha :: Replies: 10 :: Views: 3650
I need 300 mhz transmiter 1Km distance outdoor. I need transmiter 1Kbps data bit rate.
RF, Microwave, Antennas and Optics :: 03-25-2004 08:19 :: diegolinder :: Replies: 1 :: Views: 987
what the power vaule means in Libray Compiler ? uW/mhz or other ?
ASIC Design Methodologies and Tools (Digital) :: 04-06-2004 06:02 :: hgz :: Replies: 13 :: Views: 2627
I am designing a board with master frequency 50 mhz
But I have hazards in the board ; the board is double face
Should it be 4 layers or the hazard can be from another source ?
PCB Routing Schematic Layout software and Simulation :: 04-10-2004 05:20 :: Vonn :: Replies: 3 :: Views: 881
Have anyone tried this?
I know Mininec, NEC-2, etc is probably the first choice for these simulations. But how about using MWS and HFSS? Any limitations at these low frequencies when e.g. wire and element thickness is much smaller compared with the wavelength? How about meshing, etc?
Electromagnetic Design and Simulation :: 05-16-2004 06:30 :: VSWR :: Replies: 5 :: Views: 1106
I have been asked to design a band pass filter Front end transmitter
for RFID application at 868 mhz using 0.5 micron CMOS technology.
The thing is at that frequency i might have large value Q factor. I
think it is approximetaly at 10000.
Im quite confused as my supervisor gave this topic and i realized that
at that frequency it is
RF, Microwave, Antennas and Optics :: 06-13-2004 03:07 :: zahrein :: Replies: 0 :: Views: 948
does anyone knows any VCO that can work in the range of 200-800 mhz. if so I need a link
RF, Microwave, Antennas and Optics :: 07-05-2004 05:51 :: bibo1978 :: Replies: 8 :: Views: 1115
I need to improve the distance of remote control (typical door radiocontrol), the frequency is 30.875 mhz, power I think 10 mW, someone has a most simple schematic for 0.5 W or less power amplifier ?
RF, Microwave, Antennas and Optics :: 08-02-2004 14:57 :: koky :: Replies: 1 :: Views: 812
what's difference B/W MIPS and mhz ? and when each of them is used ?
Electronic Elementary Questions :: 08-14-2004 08:08 :: vaf20 :: Replies: 1 :: Views: 6517
I want to convert 2.048 mhz to 10mhz... I have Spartan-3 device... Using DCM I am not able to get the exact factor for 10mhz.. I tried to search PLL also... but couldnt get anything... Can any one help me..
PLD, SPLD, GAL, CPLD, FPGA Design :: 10-06-2004 11:24 :: jay_ec_engg :: Replies: 11 :: Views: 1812
I have oscillator (216 mhz, PECL) connected to differential mux (PECL) on a digital board and fails. I get only noise. Same oscillator works on another analog board. Set up is so simple. What could be wrong with it? Any debugging suggestions?
Analog Circuit Design :: 10-24-2004 14:13 :: chinito :: Replies: 2 :: Views: 1081
Does anyone have i2c routines written in asembler for pic16f84a running on 10 or 8 mhz, THAT WORK?
I am trying to get these I have here to work but it's giving me bad time. As I can remember it worked on 4 mhz but at 10 mhz I get all crazy data where reading, so, I don't even know if it writes to the chip. First I need to write (...)
Microcontrollers :: 10-29-2004 18:33 :: traxonja :: Replies: 2 :: Views: 1320
What is 40.68 mhz generally used for in various countries?
RF, Microwave, Antennas and Optics :: 11-06-2004 22:51 :: jevans2819 :: Replies: 1 :: Views: 1632
I am developing a 418 (US) and 433 mhz (EU) transmitter / receiver with FSK for fairly low data rate (<10 kbit/sec) for remote control purposes inside a home. It is not a trcvr but a single TX and RX and the devices should be low $.
Now for indoor propagation one has always the big problem of multipath "dips" when walking around in a
RF, Microwave, Antennas and Optics :: 11-12-2004 11:35 :: multanova51 :: Replies: 1 :: Views: 1283
I am looking for a PLL/VCO-chip (preferably not SMD) to generate a 10.7 mhz from a 10.000 mhz clock.
Does anybody know such a chip?
Professional Hardware and Electronics Design :: 12-17-2004 05:14 :: hrudolf :: Replies: 2 :: Views: 2026
What would be your suggestions for the most efficient power amp chip at 900 - 930 mhz and 300 mW output power?
RF, Microwave, Antennas and Optics :: 02-07-2005 09:37 :: biff44 :: Replies: 8 :: Views: 1124
I need to design peak detector for 40mhz sine wave. There are some fast operational amplifiers that could be used in the project. These are current feedback devices but I don't know how to design a peak detector by means of such amplifiers.
Analog Circuit Design :: 02-15-2005 08:26 :: kekon :: Replies: 9 :: Views: 1772