22Bahman

تبلیغات

تبلیغات

موضوعات

موضوعات

جستجو

جستجو

پیوندهای روزانه

پیوندهای روزانه

لینک دوستان

لینک دوستان

صفحات جانبی

صفحات جانبی

امکانات جانبی

امکانات جانبی

آمار وب سایت:  

بازدید امروز : 1391
بازدید دیروز : 1458
بازدید هفته : 8772
بازدید ماه : 49469
بازدید کل : 2149139
تعداد مطالب : 620
تعداد نظرات : 110
تعداد آنلاین : 1

22Bahman

  • 545


  • تاریخ ارسال : پنج شنبه 22 بهمن 1394 ساعت: 10:2
  • نویسنده :

می پسندم نمی پسندم
نظرات()
برچسب ها : ,

وات متر و برگشت سنج جديد

 

 

 

دوست عزيزم اقاي محمد رضا رنجكش اين دستگاه را ساخته اند

 

 


  • تاریخ ارسال : یک شنبه 18 بهمن 1394 ساعت: 14:34
  • نویسنده :

می پسندم نمی پسندم
نظرات()
برچسب ها : ,

recever radio

Many thanks to David Ai2A for the excellent revision of the following text

40 m Band Superhet Receiver

By the addition of one integrated circuit and some passive components, I was able to convert my earlier developed 40-meter direct conversion receiver design into a superhet model. Anyone who has listened to 40 meters during the evening hours on the crowded 40 m band will appreciate the advantages of the single signal reception, which this circuit offers. All simple direct conversion receiver designs suffer from degraded selectivity performance and are more subject to overload by contrasted to even modest superhet designs. Direct conversion designs are simpler by contrast because they are missing an IF stage and any associated filtering, a BFO and the second mixer.

In order to modify the design to create a superhet model, it was necessary to increase the 1st oscillator frequency from 7000 kHz - 7040 kHz to a revised range of 10686 kHz -10731 kHz (operating frequency plus the intermediate frequency). The choice of this 1st oscillator frequency turned out to be fairly easy by considering the availability of 3686 kHz crystals. Bandwidth is set to 200 Hz by a series coupled filter (using a single 3686 kHz crystal) in the IF amplifier section. This choice is highly suitable for CW operation. The choice of 3686 kHz IF allows use of readily available 10.7 mHz ceramic resonator in the 1st oscillator circuit.

Fig.1: Receiver circuit diagram

 

 

The first part of the circuit to be described is the 1st oscillator (main tuning). It is a variation of the Colpitts type oscillator. It uses a 10,7 ceramic resonator as its frequency-determining component. Unlike a quartz crystal based VXO, the ceramic resonator Q1 results in a much broader tuning range (approximately 45 kHz) while still maintaining a desired level of frequency stability at the same time.

A second ceramic resonator with a center frequency of 7020 kHz is used as a front-end filter. This effectively attenuates much of the strong S9 +40 dB strong signal interference from the 41-meter shortwave broadcast band. The shape factor and center frequency, while not a perfect choice, perform quite well. The stop band for this resonator appears to be located at 7125 kHz - well beyond the desired 7040 kHz. The availability, low price, simplicity of the circuit and absence of alignment warrant suggest inclusion of this specific device. A network formed by L1 and L2 help match the 330 ohms resonator impedance to the 50 ohms of the diode ring mixer and the antenna.

The output of the ring diode mixer is coupled to an IF stage based on the NE592 broadband amplifier. I was able to narrow the IF selectivity to 200 Hz by adding a crystal filter using series interstage coupling (formed by a 3686 MHz quartz and resistor R8) between pins 2 and 7. The mixer sees at its IF port a parallel circuit consisting out of R7 and the high input impedance of IC1. L3 and C9 form a parallel resonant circuit that is tuned to the IF. The value of C9 is not critical because the output resistance of IC1 causes strong damping.

The second mixer based on the well-known NE612 and is used as a product detector. The mixer output pins of the NE612 drive the differential input of the NE5532 audio amplifier. Any remaining RF energy present at the output pins is shunted to ground by using the two capacitors C14 and C15. These effectively couple only an AF signal output from the product detector stage into the audio amplifier.

The AF stage has a gain of 60 dB at the 750 Hz audio filter center frequency. The audio filter center frequency is determined by the component values used in the passive series resonant circuit formed by Dr1 and C16. The audio output volume adjustment is controlled with an RF attenuator control P1, located close to the antenna input. The NE5532 output resistance is relatively low, so 60 Ohms headphones can be used without an additional series resistor.

The receiver operates well across a wide range of supply voltages ranging from 9 V to 15 V. The AF amplifier is directly powered from the supply rail. The IF amplifier, second mixer and oscillator need approximately + 8 V. A series voltage-dropping resistor R9 normally meets this requirement. In practice, if the resulting voltage is less than 7 V, reduce the value of R9. Alternatively, one could use a + 8 V voltage regulator in place of R9. Without any input signal, the receiver consumes only a mere 25 mA.

Receiver alignment requires a frequency counter and an oscilloscope. First, measure the 1st oscillator frequency and observe its output voltage at pin 1 of the ring diode mixer. The frequency should be 10686 kHz with C1 at the maximum setting and 10731 kHz at its minimum setting. The measured 1st oscillator (LO) voltage applied to the mixer should measure about 0,5 Vss. If the desired frequency values are not correct, vary C3 and / or C4 slightly. Next adjust the trimmer capacitor C10. It serves to slightly adjust the BFO offset frequency and therefore the resulting received signal AF tone or pitch. The best performance will occur when the BFO frequency offset results in an audio tone of about 750 Hz (matching the passive audio filter resonance (C16 and DR1).


  • تاریخ ارسال : پنج شنبه 15 بهمن 1394 ساعت: 23:44
  • نویسنده :

می پسندم نمی پسندم
نظرات()
برچسب ها : ,

swr meter

my friend  Mr. Rezaee  vswr  meter

 

 


  • تاریخ ارسال : سه شنبه 13 بهمن 1394 ساعت: 18:24
  • نویسنده :

می پسندم نمی پسندم
نظرات()
برچسب ها : ,

dds amplifier

 

 

 

 


  • تاریخ ارسال : شنبه 10 بهمن 1394 ساعت: 19:44
  • نویسنده :

می پسندم نمی پسندم
نظرات()
برچسب ها : ,

pllبرای فرستنده وگیرنده ها

pllبرای فرستنده وگیرنده ها طرح از خودم


باسلام به همه دوستان عزیز..مدتی بود برای یافتن مدار اسیلاتور باثبات مثل pll یا سینتی سایزر تلاش میکردم اما هیچ یک از مدارات موجود اینترنت محدوده فرکانس و استپ مناسب رانداشتند..اجبارا پس ازمطالعه وساختن چندین مدار به این نتیچه رسیدم که خودم مداری دلخواه طراحی کنم..نتیجه این مدار است که از پائین ترین فرکانس مورد نیاز ما تا 950 مگاهرتز را جواب میدهد..آی سی 4046 دارای 2 ورودی و2 خروجی مورد نیاز ماست..پایه 3 ورودی سیگنال از اسیلاتور بعداز تقسیم شدن بر Nو پایه شماره 14 ورودی فرکانس مرجع یا reference...در این مداریک تقسیم بر 10وبازهم تقسیم بر 10 با استفاده از 4017 بکاربردم..برای استفاده در رادیو ssb چون کریستالها 8 مگ هستند احتیاج به اسیلاتور 6 تا 6.350 داریم..حال اگر برای فرکانس مرجع از فانکشن ژنراتور 60khz به پایه 14اعمال کنیم باید از اسیلاتور ما بعداز تقسیم بر 100 همان 60کیلوهرتز راداشته باشیم تا عمل قفل انجام شود..اگر فرکانس اسیلاتور ما بدون اعمال هیچ گونه ولتی به وری کپ 6مگ یا کمی کمتر باشد یاپه شماره 10 ای سی 4046 ولتاژی به وری کپ میفرستد تاروی به 6 مگ برسد..مثلا با فانکشن جنراتور فرکانس 623 کیلوهرتز را اعمال کنیم فرکانس اسیلاتور فوری روی 6.230 میرود..وچون این فانکشن جنراتور استپ های یک هرتزی دارد واز طرفی ماتقسیم بر 100 استفاده کردیم با تغییر هر یک هرتز 100 هرتز تغییر بالا یا پائین خواهیم داشت که برای ssb بسیار مناسب است..برای کار درفرکانسهای بالاتر باید یک تقسیم بر 10 دیگر اضافه کنیم..من با مداری که میبینید و744017 تا45 مگ بدست آوردم ..4017 موجود ردبازار تاحدود 10 مگ خوبنداما744017 تا 45 مگ کارکرد..ولتاژ بکاررفته 10 تا 12 ولت ..پایه شماره 1 ایسی 4046 در صورت نبودن سیگنال در یکی از 2 ورودی صفر ودرهنگام بودن هر 2 سیگنال اما قفل نبودن 4 ولت ودر صورت همفاز وهم فرکانس بودن هر2 وردی به 10 ولت میرسد بنا براین LEDنشاندهنده حالت قفل را بکار می اندازد..با تنظیم پتانسیومتر 5 کیلو اهمی میتوانید طوری تنظیم کنید که درحالت قفل نبودن کمی روشن وهنگام قفل پر نور باشد..74hc4017 مناسبتر است..
 
 

  • تاریخ ارسال : چهار شنبه 7 بهمن 1394 ساعت: 16:25
  • نویسنده :

می پسندم نمی پسندم
نظرات()
برچسب ها : ,

Simple, low cost AM SWBC Receiver

  • 1036

 

This project has been updated. This design was originally published 10 years ago (2004) and since then several parts have become discontiuned and no longer available. The part numbers for many of the parts have changed so they come up as "not found" when you go looking for them. Since FAR circuits recently made up some boards for this project, I decided it was time to update the information.


This AM Short Wave Broadcast Receiver is a reasonably simple, but effective design and can be built at low cost. It requires no adjustments to get to work and is more or less fool proof. This makes it a great beginners project, with little or no test equipment. The radio can be built for about $20.00, even if all new parts need to be bought. Many of the parts can be salvaged from an old AM/FM transistor or clock radio.

The radio will drive a small speaker to a comfortable volume. It will work with a short wire (3 feet or longer) or telescoping antenna. Tuning range is about 5.5 MHz to 10 MHz, using a coarse and fine tuning control. The radio can be powered by a 9 volt battery and draws about 21 ma of current. I would recomment using AA batteries or a small 9V AC adaptor to power the radio, as 9V radio batteries are expensive and won't last too long.

How it works:

The antenna is coupled into the mixer through C1, 100 pfd. The input to the mixer is tuned to about the receive frequency of interest by L1 and a poly-variable cap. The tuning cap can be a little hard to find as a new part, but can be salvaged from a dead or cheap AM/FM radio. (Poly-variables are available from qrpkits.com )

The mixer is an active stage using two JFETs in a cascode configuration. 2N3819's are shown, but just about any N channel JFET will work. The circuit was shamelessly borrowed from experimental Methods of RF Design" by W7OZI and co-anthers. This mixer exhibits about 13 dB of conversion gain. It requires a large amplitude Local Oscillator drive, which makes directly coupling to the square wave output of the 74HC4046 VCO quite acceptable.

The output of the mixer is tuned to the IF frequency of 455 kHz by the IF transformer T1. This is coupled into a cascode amplifier consisting of Q2 and Q3. This amplifier basically combines a common emitter amplifier to which the input signal is coupled to, with a common base amplifier which adds additional gain, but keeps the amplifier quite stable. The output of this stage is again tuned with a 455 kHz IF transformer. The combination of the two IF transformers gives the radio some selectivity.

The AM signal is detected by a Shottky diode on the output of T2. A Shottky is used due to its low forward drop voltage, which reduces the level needed to detect a signal by at least 3 times over a silicon diode. The diode is connected to the volume control, which in turn goes to a LM386 audio amp. Forward bias was added to the detector diode to improve small signal sensitity and improves the audio quality. R17 supplies the bias and C23 by-passes the RF. These parts need to be added to the bottom of the circuit board.

The Local Oscillator uses the Voltage tuned R/C oscillator section of a 74HC4046 PLL. This part is capable of generating a signal up to about 30 MHz. C18 and R11 comprise the R/C part of the oscillator. The R/C oscillator isn't very stable and constantly bounces around a few 100 Hz. Fortunetly, the wide bandwidth of the IF and the nature of AM modulation is such that the instablility is not noticable to any great extent.

The original design was set up to just tune three SWBC bands and used a bank of three resistors selected by a switch to set the center of the tuning frequency to those bands. The TI chip tunes a wider frequency range so the voltages which need to be set for each band become farily close to each other, making it difficult to come up with standard values for the divider. Plus there is the problem of parts tollerances which will cause the exact voltages needed for a specific frequency to vary unit to unit.

The best way to solve this delema was simply to make continues tuning. Spaning large frequency range with a single turn pot makes for some very touchy tuning, so a fine tune control was added. Or you could use a 10 turn pot, but those are expensive. Trimmer resistors could have been used to set the center frequency for each band, but the board was not set up for that and now that boards have been made, too late to change.

WARNING: Not all 74HC4046s are created equal. The values shown are for the CD74HC4046N made by Texas Insturments (which is currently the only supplier of new through hole versions of this part). Parts made by a different manufacturer will require different values. Probably radically different values. The origninal CMOS 4046 parts will not work, as they have a much lower maximum operating frequency.

Construction:

Parts list and assembly drawings at bottom of page.

If you can make your own circuit boards, the layout and component location screen is avaiable as SWBC_PCB.pdf . A premade circuit board is also available from FAR Circuits for $5.00. (note, if you get the FAR board, there is a missing hole for one of the pins for T2 which you will have to drill).

Assembly is straight forward. It is easiest to start with the resistors, then the IC's, then the caps and so on. Note that the lead spacing for the resistors is very tight for 1/4 W resistors. You may want to use 1/8 W instead.

Adding some forward bias to the detector diode improves sensitivity and fidelity of the received signal. This is done be isolating the normally grounded pin of T2 secondary and adding a resistor between the pin and plus supply and adding a bypass cap between the pin and ground. Since the hole for this pin is missing from the board supplied by FAR curcuits, using a common 1/16" drill bit to make the hole should be big enough. Just be careful not to short to the foil around the hole when adding the components to the pin. You could also use an XACTO knife to cut the foil.

A frequency counter can be connected to pin 4 of U2, the 74HC4046. This is a 5 volt square wave. A 6 digit LED counter with programable IF offset can be bought direct from China for about $15US. This makes a nice digial dial, but draws an additional 90 ma. Set the dial for negative IF offset. In this mode, it will add the IF offset to the VFO frequency. Note that these counters clip the input to 600 mv with diode clamps which will load down the output of the '4046. In this case, add a series resistor of 3.3K or there abouts bewteen the coutner input and 4046 output.

The two IF transformers should come set close enough to the same frequency so they don't need adjustment. But if you must (and we must) try and peak the signals, adjust just one transformer and NEVER touch the other. Otherwise, you will chase the center frequency up and down the adjustment range of the coils!

The input tuning is sharp enough that it will require frequent re-peaking as the coarse frequency is tuned up and down the tuning range.

Parts list

Designator Value Mouser part number Price as of 11/04  
C poly-variable 20-180p salvage from AM/FM radio or www.qrpkits.con  
C5 - 10,14,19,21,22 .1 uFd (10 TOTAL) 80-C317C104M5U $0.12 each  
C1, C11, C18 100 pFd NPO / C0G   $0.06 each  
C12,C13 .001 uFd 140-50P2-102K $0.08 each  
C15,C20 4.7 uFd /16V 140-XRL16V4.7 $0.06 each  
C16/C17 100 uFd / 16V 140-XRL16V47 $0.06  
L1 4.7 uHy 434-22-4R7 $0.20 or 34T on T37-2
R8/12 15K 5% 1/4W 291-15K $0.07 10 min order ($1.98 / 200!)
R2/4/5/9 100 ohm 5% 1/4W 291-100    
R3/14/17 100K 5% 1/4W 291-100K    
R1/6/7/13/16 22K 5% 1/4W 291-22K    
R10 10 ohm 5% 1/4W 291-10    
R11 3.3K 5% 1/4W 291-3.3K  
R15 NOT USED    
       
T1/T2 455 kHz IF transformer 42IF103-RC $1.07each (need two)  
V1/V3 10K linear pot 31VA401 $1.25 (need two)  
V2 50K audio pot 31C501 $1.13 17mm with on/off sw
U1 74HC4046 595-CD74HC4046AE $0.66 DIP-16
U2 LM386N 926-LM386N/NOPB $1.01 DIP-8
U3 78L05 512-LM78L05ACZX $0.27 TO-92
Q1/2 2N3819 610-2N3819 $0.86 each TO-92
Q2/3 2N3904 512-2N3904BU $0.19 each TO-92
D1 SD101A 625-SD101A $0.17  
D2 1N5817 615-1N5817 $0.14  
         
speaker 3" 8 ohm 253-4130 $1.91  

 

 

HOME


  • تاریخ ارسال : سه شنبه 6 بهمن 1394 ساعت: 14:30
  • نویسنده :

می پسندم نمی پسندم
نظرات()
برچسب ها : ,

/iranian-contest/

http://www.dxcoffee.com/eng/2016/iranian-contest/


  • تاریخ ارسال : دو شنبه 5 بهمن 1394 ساعت: 18:52
  • نویسنده :

می پسندم نمی پسندم
نظرات()
برچسب ها : ,

AD9850 DDS based Antenna Tuner Adjustment Aid

ARDUINO project

AD9850 DDS based Antenna Tuner Adjustment Aid

If you use a manual antenna tuner to match your transmitter to the antenna, not causing QRM while your making the adjustments can be an issue.. This project eliminates that problem by using a very low level signal and a very sensitive SWR bridge.

An inexpensive Arduino board is use to control a AD9850 DDS module and LCD display, while a handful of discrete parts comprise the SWR bridge. A simple LED is used as the match indicator.

Operation:

It is very simple.

A preprogrammed frequency for each of the HF bands, 160 to 10 meters is selected by repetitively pushing the [ CHANGE BAND ] switch. I programmed in the various QRP calling frequencies in the CW segment of each band. You can of course change that in the Sketch by changing the frequency (freq) in the band look up table.

The operating frequency can be changed using a rotary encode with Gray code output. If the frequency changes in X2 steps, you have an encoder with quadature output.

The default tuning rate is 10 kHz, which allows for quickly moving the frequency to another part of the band. The tuning rate can be changed by pushing the [ CHANGE RATE] button. 10 Hz, 100 Hz, 1 kHz and 10 kHz rates can be selected. The active decade for tuning is indicated by the cursor underscore of the selected decade.

Note that tuning limits are enabled so you can't tune outside of the selected Ham band.

Once the desired band and frequency is selected, the [ TRANSMIT ] toggle switch is used to turn the DDS signal on and off. .

When the [ TRANSMIT ] switch is closed, the DDS is loaded with the frequency data, a 600 Hz sidetone is generated and Pin 8 is set HIGH, which can be used to control a power amplifier or switch over relay. When the [ TRANSMIT ] switch is open, it loads 0 Hz into the DDS chip, effectively turning it off. You don't want to leave it on or there will be a birdie at that frequency in your receiver.

You will of course need a coax switch ( or relay) to switch the antenna tuner between this device and your rig.

With the tuning aid connected to your tuner, adjust the tuner to make the indicator LED go out or to dim as much as possible.

Theory of operation:

The SWR bridge and indicator:

The SWR bridge is a Whetstone configuration, with the antenna in the unknown leg of the bridge. If the resistance of each leg is equal, there is no voltage difference between the center of the two legs, which indicates a match. I used 51 ohm resistors in the bridge as their close enough to 50 ohms, but if you do want an exact 50 ohm match, use 100 ohm resistors in parallel instead.

The bridge is driven by the square wave output of the AD9850, through a simple L/C low pass filter to remove most of the harmonics. With out this filter, harmonic from the square wave drive will reflect back and keep the LED from going completely out or at least get very dim. The filter starts to roll off at about 2 MHz so there is still enough harmonic energy when operating below 30 meters and the best you can do is make the LED very dim. You can still achive a 1:1 match without using the low pass filter, but the dip is much harder to see.

If the resistance of the unknown leg is not equal to the value of the other three resistors in the bridge, there is a voltage difference between the centers of each leg. This voltage is coupled to a high gain darlington amplifier using a step up transformer. R1 and R2 supply just enough voltage bias to the base of Q1 to improve the sensitivity without actually turning it on. A LED in series with Q2 which provides a visual indication of the amount of current flowing into the amplifier. The greater the imbalance of the bridge, the greater the voltage inputted to the amplifier and the greater the current in the collector path. The is only one potential problem with this method. If you live near a AM broadcast station you might pick up enough signal to keep the LED on all the time as you won't be able to balance the bridge at that frequency.

Construction:

I intially used a UNO R3 board for develpoment, but used a NANO board for the final assembly. The schematic show wiring for the NANO board. Because the AD9850 and the LED back lighting of the display use a fair amount of current, a seperate 5V regulator is used to power these devices, rather then using the 5V regulator on the NANO board, as it would likely get very hot.

There are two types of AD9850 DDS modules available from China. I used the one with the two rows of 20 header pins and looks like a large DIP IC. If you use the other flavor, just follow the hook up diagram to connect to the required pins. These DDS modules are running about $10 at the time of this writing. Pretty amazing since the AD9850 chip costs $21 if you bought it all by it's self.

The LCD is a common 2 line, 16 character display. The ones with blue back lighting are very common and inexpensive. These run about $3.

All three of these major components can be obtained inexpensively direct for China buying with ebay. It just takes a few weeks to get them. If your in more of a rush, banggood.com can ship these from a US warehouse for a small price premium.

The rest of the discrete parts needed to build the SWR bridge and indicator can be obtained for the usual sources like Mouser or Jamesco. The MSP5179 transistors have a 1 GHz hft, so they still have decent gain at 28 MHz. You could sub the more common 2N3904's but it won't be as sensitive on the higher bands or may not work at all. If the LED does not light or is very dim at the higher frequencies, you don't have enough gain.

Since most of the componets are modules, I buit the project on a piece of FR4 pref board, using SIP sockets for the modules to plug into. The SIP sockets come in 40 pin strips. To cut them down to size, remove the pin one location past the number of pins you need and cut that slot with an hobby knife of razor saw. I use #28 heat stripable magnet wire to make all the interconnections. That way I don't need to strip insulated wire and makes for a neat looking wiring job.

The SWR bridge and amplifier could have been wired up right on the perf board, but I built it on a small scrap of copper clad board, dead bug style, which is a bit quicker and easier way to build it.

For final packaging, I recycled an old Radio Shack enclosure. Since the front panel of this box already had a number of holes in it (all in the wrong places, except for the display window, which was cut for a smaller display) I had to cover the old holes up somehow. I did this by simply putting down some double sided tape on the panel and then laid down a piece of black contruction paper and trimmed it to fit. This is then covered with a thin piece of clear Polycarbonate, which is easy to work with.

Programming the Arduino and the program "Sketch":

Hopefully your already familiar with the Arduino. If not a simple web search will come up with linksto the official Arduino web site with all the info you need.

The Sketch which you need is located in this zip file: Arduino_9850_sketch.zip

Once the Sketch has been downloaded into the Arduino board and everything is wired up, you will have to make one adjustment on the DDS module board. With the "unknown" leg of the bridge open, adjust the little trimmer resistor on the 9850 module until the SWR indicator LED comes on brightly. This trimmer sets the duty cycle of the square wave output and you want it more or less centered at 50%, but without a 'Scope just set it in about the middle of the adjustment range which makes the SWR LED stay on.

Parting thoughts:

This is my first Arduino "Sketch" and I'm pretty amazed I was able get it to work. I did take some late nights just to figure out how to do some simple things. I normally program directly in assembly which makes a whole lot more sense to me and is vasty more memory efficient and faster.

Although I designed this for the SWR bridge application, it can also be used as a signal generator, a transmitter VFO or even the VFO for a transceiver, although some modifications to the Sketch will be required for other applications.

For use as a signal generator with full tuning range, comment out the band limit tests in the DDSincerment() and DDSdecerment() routines and enable the max freq and min freq limits instead.

For a transceiver, you can add or subtract an offset to the base frequency before loading the DDS chip.

Anyway, I hope someone finds this project useful.

73, Steve KD1JV

 

 

 

 

 

 


  • تاریخ ارسال : دو شنبه 5 بهمن 1394 ساعت: 18:27
  • نویسنده :

می پسندم نمی پسندم
نظرات()
برچسب ها : ,

hf reciver

 

 

 

 

 

مطلب فوق را جناب مهندس رسولي ارائه كردندو ازين بابت بسيار سپاسگذارم

 


  • تاریخ ارسال : دو شنبه 5 بهمن 1394 ساعت: 11:3
  • نویسنده :

می پسندم نمی پسندم
نظرات()
برچسب ها : ,

contest


  • تاریخ ارسال : یک شنبه 4 بهمن 1394 ساعت: 15:12
  • نویسنده :

می پسندم نمی پسندم
نظرات()
برچسب ها : ,
ورود کاربران

ورود کاربران

    نام کاربری
    رمز عبور

    » رمز عبور را فراموش کردم ؟
    عضويت سريع

    عضويت سريع

      نام کاربری
      رمز عبور
      تکرار رمز
      ایمیل
      کد تصویری
      پشتيباني آنلاين

      پشتيباني آنلاين

        پشتيباني آنلاين
        آمار

        آمار

          آمار مطالب آمار مطالب
          کل مطالب کل مطالب : 620
          کل نظرات کل نظرات : 110
          آمار کاربران آمار کاربران
          افراد آنلاین افراد آنلاین : 1
          تعداد اعضا تعداد اعضا : 40

          آمار بازدیدآمار بازدید
          بازدید امروز بازدید امروز : 1391
          بازدید دیروز بازدید دیروز : 1458
          ورودی امروز گوگل ورودی امروز گوگل : 139
          ورودی گوگل دیروز ورودی گوگل دیروز : 146
          آي پي امروز آي پي امروز : 464
          آي پي ديروز آي پي ديروز : 486
          بازدید هفته بازدید هفته : 8772
          بازدید ماه بازدید ماه : 49469
          بازدید سال بازدید سال : 570067
          بازدید کلی بازدید کلی : 2149139

          اطلاعات شما اطلاعات شما
          آی پی آی پی : 54.92.158.65
          مرورگر مرورگر :
          سیستم عامل سیستم عامل :
          تاریخ امروز امروز :
          خبرنامه

          خبرنامه

            براي اطلاع از آپيدت شدن سایت در خبرنامه سایت عضو شويد تا جديدترين مطالب به ايميل شما ارسال شود



            آخرین نطرات کاربران

            آخرین نطرات کاربران

              سعید سعید - با سلام استاد
              تو مدار برزیلی یه رله داریم این کارش چیه ؟ مثلا اگر رله فعال بشه چی میشه؟ یه کلید جا گذاری شده براش .
              تو قسمت ورودی موج vfo به 7358 یه cwkeyزده به پایه 3 همین آیسی برای چیه؟
              ce keyسرچ کردم کلید مورس آمد میشه توضیح بفرمایید ممنون میشم .
              پاسخ:با سلام هنگام فشردن کلید PTT روی میکروفون پایه دوم سیم پیچ رله موجود در مدار زمین شده و سر دیگر این رله به مثبت باطری وصل است باعث عملکرد رله شده و لذا دوکنتاکت ان عمل کرده یکی ورودی گیرنده را بزمین وصل می کند تا امواج فرستنده وارد گیرنده نشده و اسیب نرسانند کنتاکت دیگر رله هم ولتاژ مثبت تغذیه را که در حالت معمولی به خط مثبت گیرنده وصل است قطع و خط مثبت فرستنده را فعال می کند +tx cw key بله کلید مورس است که برای کاردر حالت مورس مولد موج جدا داشته که بجای میکروفون کار کرده و سیگنال را ارسال می کند - 1396/4/26
              PariaParia - سلام ميشه در مورد مدار بيشتر توضيح دديد؟چطور ميتونم شمارو پيدا كنم؟به اين پروژه شديدا نياز دارم ممنونم ميشم جواب بديد
              پاسخ:با سلام و ارزوی سلامتی و توفیق روز افزون برای شما اگر عضو تلگرام هستید با شماره همراه تلگرامی خود با شماره تلگرامم تماس بگیرید و در گروههای تخصصی راجع به اینگونه مطالب عضو شوید در غیر اینصورت با تماس با ایمیل بنده مطالب مورد نظرتان ارسال خواهد شد 09192130291 abdolhagh@gmail.com گروه مهندسین مخابرات میدان طراحی آنتن ، مدارات مایکروویو و RF لینک دعوت : https://t.me/joinchat/AAAAAD2zsfeBb5LKzJyD5A - 1396/4/4
              علیعلی - پست جالبی بود مهندس برای خرید دانگل RTL2832U میشه به آقای نریمانی اعتماد کرد؟ R820T2 رو میدن 170
              شما شخص بهتری سراغ دارین که مورد اعتماد ودر عین حال منصف باشه؟
              پاسخ:با سلام بنده هیچ شخصی را تائید یا تکذیب نمی کنم اقای علیپور به نمایندگی اقای قنبری این دستگاه رو در جعبه مجزا با فن می فروشد - 1395/12/28
              PayamPayam -

              سلام با این مشخصاتی که شما دادید کار نکرد ساختمش نصب سطحیم کردم قطعاتو
              آیا خودتون ساختینش؟
              اگر اره پس چرا کار نمیکنه!!!
              اگه نه پس چرا مجبورمون کردید بسازیم؟؟
              حالا که کار از کار گذشته
              این پستتونم واسه تقریبا سه سال پیشه خواهش میکنم کمکم کنید اگر این پستمو دیدید نزارید به دست ایندگان برسه که اونوقت نه از من اثری,هست نه مداری,که ساختم
              ۰۹۳۰۹۴۹۶۳۶۲
              P.anzali.ussd@gmail.com
              پاسخ:با سلام و تشکر از اظهار نظر جنابعالی این طرح رادیوی ساده اف ام بوده که خیلی از شرکتهای سازنده کیت انرا ساخته اند و البته نکته مهم ان همان کابل کواکسیال و تنظیم دقیق انتن است البته شاهد کار کرد این مدار مهندس سجادیان از اولین رادیو اماتورهای ایران بودند که خودشان هم باور نمی کردند . ضمنا دوست عزیز اماتوری تجربه است نه ساختن و تعهد انجام کار و اینکه عاشق اگر به معشوق برسد کارش افسانه نخواهد شد شمارا هم کسی مجبور نکرد و در عین حال اینهمه طرح در سایت هست بنده هیچکدامشان را نساخته ام و تعهد هم نسپرده ام که کار کند هدف یاد گرفتن است و گرنه در دبیزستان یا دانشگاه کلی مطلب به شما می اموزند شما همه را تجربه می کنید و ازمایش می کنید خوش بحال شما و اینهمه تجربه

              - 1395/12/14
              مهدیمهدی - استاد نقل قول از بنده وپاسخ شما:
              بنده برای مدار ssb آقای قنبری یه آنتن میخواستم درست کنم سادترین آنتن که بتونه خیلی خوب جواب بده چطوری میتونم بسازم اگر تصویری دارید برام خواهشن ازسال بکنید ممنون از سایت عالیتون
              پاسخ:با سلام و ارزوی سلامتی و توفیق روز افزون شما مطلبی را در این مورد تهیه و خدمتتون اراعه خواهم کرد - 1395/9/1

              -------------------------------------------
              استاد ما منتظریم یه عنایت بکنید به زبان ساده وطوری که ما مبتدیا هم بفهمیم آموزش ساخت آنتن رو بزارید ممنون
              با سلام بله حق با شماست فراموش کردم و عذرخواهم در اولین فرصت ساخت چند انتن ساده را برای رادیوتان اعلام خواهم کرد بازهم ببخشید - 1395/12/8
              سید محمد عظیمیسید محمد عظیمی - با سلام
              خیلی ممنونم جناب عبدالحق بابت اطلاع رسانی
              پاسخ:با تشکر از زحماتی که کشیدند و آرزوی توفیق روز افزون گروه و برگزاری این مراسم در مشهد مقدس - 1395/11/2
              علی نصیریانعلی نصیریان - فروش فرستنده FM مجهز به نمایشگر LCD هشت و پانزده وات بصورت منتاژ شده و منتاژ نشده, - 1395/10/23
              مهدیمهدی - با سلام



              بنده برای مدار ssb آقای قنبری یه آنتن میخواستم درست کنم سادترین آنتن که بتونه خیلی خوب جواب بده چطوری میتونم بسازم اگر تصویری دارید برام خواهشن ازسال بکنید ممنون از سایت عالیتون
              پاسخ:با سلام و ارزوی سلامتی و توفیق روز افزون شما مطلبی را در این مورد تهیه و خدمتتون اراعه خواهم کرد - 1395/9/1
              رضاییرضایی - سلام خیلی خیلی جالب بود
              پاسخ: سلام لطف و بزرگواری شما است - 1395/7/29
              رضاییرضایی - با سلام یادمه سال 1372 اولین فرستنده لامپی رو با لامپ 6aq5 تو فرکانس حدود 3 مگاهرتس ساختم قدرت و سادگی مدار منو به تعجب انداخت
              بگذریم از اینکه چقد دنبال لامپه توشهر زاهدان گشتم
              الانم گاه وبیگاه سرگرمی من ساخت فرستنده های کوچیکه ضمنا یه پیشنهاد داشتم که یه کم بیاین توخط فرستنده گیرنده دیجیتال
              خیلی جالبه که بایه فرستنده دیجیتال فرکانس پایین کیفیت صدای در حد fm رو داشته باشین
              پاسخ: سلام اگر بزرگواری کنید و طرح یا مدار یا نقشه یا پروژه دیجیتالی دارید در اختیار جمع علاقمندان بگذارید خیلی متشکر می شوم ایمیل بنده در خدمتتونه ep2mrd@gmail.com and abdolhagh@gmail.com - 1395/7/26

              درباره ما

                به وب سایت من خوش امدید در این مقوله علاقمندم اطلاعاتی از رادیو اماتوری که در ذهن داشته و در حال پاک شدن هستند را یادآوری و بهمراه عکس و مطلب جهت اطلاع علاقمندان درج و در این زمینه هر گونه همکاری و اعلام نظر و بیان ایرادات مزید بر منت خواهد بود.

              کلیه ی حقوق مادی و معنوی سایت مربوط به *** خاطرات راديو آماتوري *** بوده و کپی برداری از آن با ذکر منبع بلامانع می باشد.
              قالب طراحی شده توسط: تک دیزاین و سئو و ترجمه شده و انتشار توسط: قالب گراف