Today we talk about IF Frequency and how it is used in radio. enjoy and please see my other videos. and subscribe to the channel.
Пікірлер: 113
@eliashellberg82142 жыл бұрын
Without a doubt, the best video on youtube for explaining this. Thank you so much!
@stevefoster2700Ай бұрын
I've watched a couple videos on IF to understand this and finally someone said the local oscillator frequency changes. Light bulb on...thank you!
@JP-vg8vl3 жыл бұрын
thank you for this video. I literally cannot find any video about IF frequency that explained very well like this
@alnoorr81082 жыл бұрын
Great Tutorial, We did this in Grade 12 in the Electronics Class, in 1975
@abhinav7883 ай бұрын
I really liked the part where you told about how the old radio model worked and what was the flaw in it. Such connection is very good to understand I think. Thank you!
@LL-ue3ek Жыл бұрын
Thank you so much! Plain and to the point!
@kengerace Жыл бұрын
Well done. Very easy to understand. Thanks for posting!
@theengineer99104 жыл бұрын
Glad I found this vid cause an analog design book I'm reading spoke of IF which I didn't know about
@hwjebwlsndqgajsbsksnd2 жыл бұрын
I like your background music selection.
@5vart5ol3 ай бұрын
They say Jazz is the magician of music. Are you the magician of teaching? Cause you bend and mend the knowledge to fit into any filter we student may have. Well done and thanks!
@mplmpl77804 жыл бұрын
Many thanks going for intermediate ham licence and this helped
@kw5kw3 жыл бұрын
I like Rush
@joaopedrolourencoaffonso21682 жыл бұрын
Thanks very much! Saved my life!
@alexismotet9327 Жыл бұрын
This is good. Nice history part. Thank you.
@syntaxerror24092 жыл бұрын
Thank you so much for this, this helps a lot for my upcoming report about IF circuit.
@mah67864 жыл бұрын
Really well explained, thank you. It turns out a spectrum analyzer uses the same architecture.
@TheGmr1404 жыл бұрын
Be sure to see my other videos, many are funny and interesting.
@michaelshansen7070 Жыл бұрын
WELL DONE! I finally understand fully! 😄
@TB-nz4kf6 ай бұрын
God Bless El Rushbo!
@zhixianjin875412 күн бұрын
If I understand correctly, for the upper convertor, we need to get cos(a+b) out of the mixer. All we need to do is use a IF filter at high frequency. Therefore, the only difference between down convertor and upper convertor is the IF filter passing frequencies.
@TheGmr14012 күн бұрын
Yes correct
@arelenas2 жыл бұрын
Great video! Thanks!
@felipenogueira303 жыл бұрын
Thank you so much!
@acestudioscouk-Ace-G0ACE2 жыл бұрын
Thanks for this, I understand now!
@sirashp91183 жыл бұрын
Thankyou, that was a short and sweet explanation
@chuahtc2 жыл бұрын
Well explained. Thanks!
@zulhendrazul38442 жыл бұрын
God bless you....thanks a lot.... very nice explain....
@mariofilippi35396 ай бұрын
Very good explanation, thanks very much.
@aprilmiranda31574 жыл бұрын
Super like 💕💕
@chrisw22814 жыл бұрын
brilliant video!!
@paulmaine64332 жыл бұрын
You are presenting good material. Please avoid political comments like your comments on Rush. It’s off putting to some.
@ahmedmuhammed69052 жыл бұрын
That all what i need, thanks
@jmohamed87 Жыл бұрын
Thank you !
@omsingharjit2 жыл бұрын
continue your great edu work .
@ahmedamraniakdi21433 жыл бұрын
Big thanks
@bakeronews122 күн бұрын
Nice tutorial. Thanks!
@trejohnson76773 жыл бұрын
best music
@omsingharjit2 жыл бұрын
very nice and simple explanation
@KittyFloof4 жыл бұрын
Love your videos. Can you do some on LNA, PA, and Mixer?
@TheGmr1404 жыл бұрын
i'm more of a dsp guy, but i'll make a video that goes over these parts and how we use them. thanks for watching.
@Reclaim688 ай бұрын
Good explanation!
@bensas422 жыл бұрын
Thank you so much for the explanation! What is the choice of IF Frequency (455 KHz in the example from the video) based on?
@TheGmr1402 жыл бұрын
Just a typical value used in radios
@indrashispowali2 жыл бұрын
this video is also an advertisement of uni-ball pen.... which is pretty good actually
@kristhompson81122 жыл бұрын
Nice BG Jazz with Dave B , Not sure how you get that past KZbin these days, Really appreciate your explanation, Now I have I.F in the bag I think, cus got a bit lost at the end , Ill try shoe-horn this information into understanding the Wadley Loop set up in my Dads old valve communications receiver.
@brucecorbettn9bh3989 ай бұрын
Good job.
@7MPhonemicEnglish2 жыл бұрын
Best explanation I've found but can be improved by showing actual components and electrical diagram to explain how the LO and mixer works.
@railgun19353 жыл бұрын
excellent explanation but plz no back ground music. p.s I love music in general
@raulcrudele1 Жыл бұрын
Great video. Just a comment, for AM radios, the local oscillator runs a frequency ABOVE not BELOW desired tuned radio. If you want to tune 530 - 1700 with an IF of 455, then the local oscillator runs from 985 to 2155. In FM, typical offset is 10.7 MHz. Regards!
@TheGmr140 Жыл бұрын
Thanks for watching, i just really trying to get folks to understand IF frequency
@TheGmr140 Жыл бұрын
Thanks for watching, i just really trying to get folks to understand IF frequency
@eswnl1 Жыл бұрын
The example here is low side injection. But you can have high side as well.
@klaus-udokloppstedt62574 ай бұрын
@@TheGmr140thanx @TheGmr for explaining what IF is and what it's reason. I'm just trying to learn these 'radio'-stuff and it's terms to get ideas why my vintage receiver is quite noisy when stereo is active. and thanx to @raul too, for making the connection to the 10,7MHz. 🤝
@omsingharjit Жыл бұрын
Can you make rf spectrum analyser using crt tunner and Arduino or using other available radio module from frequency of 80Mhz to arround 1Ghz plz
@TheGmr140 Жыл бұрын
for cheap. rtl-sdr is the way to go, i believe someone wrote a app that turns the rtl-sdr into a sweeping spec ana like you want. rtl can cover 80Mhz to 1GHz
@omsingharjit Жыл бұрын
@@TheGmr140 i know that but it's not Available here inindia
@Sabari-gd3fw2 жыл бұрын
Could any one please explain what is span frequency? i.e. 10 khz mentioned in this video
@TheGmr1402 жыл бұрын
Span is the signal bandwidth. Am signals have 10khz bandwidth. So span is equal to signal bandwidth.
@Sabari-gd3fw2 жыл бұрын
@@TheGmr140 Yes now I understood about span.. Thanks for your response
@morejelloplease4 жыл бұрын
now explain an SDR and a hybrid SDR found in some of these newer HF radios. you hear people rag chewing about "oh the yaesu isn't a full SDR like the icom" i think they are blowing smoke.
@microreniassance29292 жыл бұрын
So, just to be clear; when I change the frequency of the local oscillator only the RF that appears from the LNA that when subtracted from the the LO equals the resonant frequency of the IF circuitry will be that signal that is passed to demod. So, the tuning dial is actually indicating the frequency in the RF feed (1.5MHz) that when subtracted from the LO gives the IF resonant frequency. If I understand this correctly. So to listen to broadcasts at 1.5MHz, the LO is tuned via the tuning dial to the frequency that when 1.5MHz subtracted from it gives equals the 455KHz IF frequency. Meaning the LO would be tuned at 1.955MHz to receive 1.5MHz on an IF chain with a 455KHz resonance frequency. Is this correct? Great Video. I may actually be beginning to understand how it works.
@TheGmr1402 жыл бұрын
correct, tuning radio is changing lo frequency
@VargRETURNS3 жыл бұрын
so the frequency we pick on a radio is not the exact frequency being transmitted, its just the local oscillator frequency? Its proportional?
@TheGmr1403 жыл бұрын
It's the TX frequency. Local oscillator change radio station you tune in
@VargRETURNS3 жыл бұрын
@@TheGmr140 tx?
@TheGmr1402 жыл бұрын
@@VargRETURNS the signal the radio demod is the if frequency. The lo frequency shifted the TX frequency to the IF frequency
@s199h3 жыл бұрын
Doctor , Why do we need to convert the received RF signal to IF signal?
@TheGmr1403 жыл бұрын
To filter out unwanted signals, and amplify the signal you want
@s199h3 жыл бұрын
@@TheGmr140 Thank you doctor so much
@user-fk9lk6rk6f3 жыл бұрын
chilly dude chilly
@themightyquinn100 Жыл бұрын
Great video! So the filter only picks out the 455 kHz and not the 1525 kHz?
@TheGmr140 Жыл бұрын
That is correct
@prasadvindla8960 Жыл бұрын
what is difference between this down conversion v digital down conversion?
@TheGmr140 Жыл бұрын
Good question, DC is often by rf mixers to shift down to some IF frequency. DDC is a step after a ADC in firmware to shift digital signal to zero hz
@SolarDrew4 жыл бұрын
Dave Brubeck... do you copy?
@steelcantuna3 жыл бұрын
Rush Limbaugh... Yeah man really... Some people just "can't handle the truth." God, Heaven, Hell, the whole truth & nothing but the truth, turns people off!!!!!!!!!!!!!!!!!!!!! They just don't won't to hear it.
@microreniassance29292 жыл бұрын
what a joke.
@sam-kx3ty8 ай бұрын
you explained downconversion more than you explained IF frequency but good job.
@microreniassance29292 жыл бұрын
Thanks to the IF for filtering out the RL idiots!! Great video, by the way!
@omsingharjit Жыл бұрын
how IF signal further process how it demodulate like IF signal from Tv Tuner how it Further Process into Audio Can i just use Germanium Diode in series with If to get Audio ? Or Somthing needs like Saw !!
@TheGmr140 Жыл бұрын
If sends signal to demod circuit. IF ensure only one signal be at demod circuit
@omsingharjit Жыл бұрын
@@TheGmr140 what components used to demonstrate why saw filter are used can simple diode demodulate it ?
@7MPhonemicEnglish2 жыл бұрын
Are you telling me that the IF is a constant 455KHz?
@TheGmr1402 жыл бұрын
depends on design. most radios use 455khz or 10.7Mhz , the idea is you can then make a narrow and stable filter at a fixed freq. and you just change the LO to tune into different signals.
@7MPhonemicEnglish2 жыл бұрын
@@TheGmr140 Ok, thx ya and some use 465 MHz. I'm just trying to understand how the output stays at the designed designated frequency. My understanding about AM is that the audio is encoded in the wave amplitude, so as long as that passes on to the new freq. all is well. I just don't understand how a wide array of freq inputs all get output at one constant freq. I would expect frequencies equal to X minus 455 or X plus 455. I don't know how what's going on electronically.
@ahmetserdr29202 жыл бұрын
Why we dont convert to baseband? What iş the advantage of using IF
@TheGmr1402 жыл бұрын
the IF signal is then often sent to a A/D then after the A/D, the signal is shifted to DC by means of a DDC. please see my video on DDC
@ahmetserdr29202 жыл бұрын
@@TheGmr140you mean in order to get IQ Signal, am o right?
@TheGmr1402 жыл бұрын
@@ahmetserdr2920 yes, this would then be the baseband iq signal
@phillipneal8194 Жыл бұрын
Yes. But I don't want to listen to 990khz. I want to listen to 20meters !!! What do I do ?
@TheGmr140 Жыл бұрын
Change the lo
@preuton2 ай бұрын
Why is it called a multiplier? It's the sum and difference between lo and rf.
@TheGmr1402 ай бұрын
2 cos A cos B = cos A - B + cos A + B
@preuton2 ай бұрын
Why is it cosine and not sine?
@TheGmr1402 ай бұрын
Can be either
@irfan_antennas Жыл бұрын
What happens when LO and RF are same?
@irfan_antennas Жыл бұрын
frequenceis.
@TheGmr140 Жыл бұрын
hello, we want the IF to be 45Mhz, so adjust LO to make that happen. since the upconverter is really only for hf freq, one should place a 10Mhz lpf after the loop antenna
@irfan_antennas Жыл бұрын
@@TheGmr140 Thanks for the reply. Actually can you tell me what happens when the LO and RF frequencies are same?
@TheGmr140 Жыл бұрын
@@irfan_antennas this is called a zero-IF radio. when the rf and lo are the same, the IF freq is zero. the sum is filtered away. this is how the hackrf and some other sdr work. more info: google: zero-IF reciever
@irfan_antennas Жыл бұрын
@@TheGmr140 thank you so much.
@raidensama15112 жыл бұрын
Take 5 and RIP Rush Limbaugh.
@spusha013 жыл бұрын
cos(A+B)+cos(A−B) =2cosAcosB
@TheGmr1403 жыл бұрын
Thanks, in mixer hardware however the power levels are different due to lo drive. The real take away is the sum and difference frequency
@mikeghfawaz45479 ай бұрын
Intermediate Frequency
@liamausden82483 жыл бұрын
I thought it was cos(a)cos(b) = 1/2[cos(a+b) + cos(a-b)]
@TheGmr1403 жыл бұрын
you are correct. real take away is a mixer, which makes sum and diff frequency. but yes you correct.
@liamausden82483 жыл бұрын
@@TheGmr140 Thanks for the reply. Good video!
@kootaru_3 жыл бұрын
я ничего не понял(
@mdesm20052 ай бұрын
I like Rush, so I stopped at 1:00 and rated a thumbs down.