W2AEW thanks for the great info. This helped me to clean up the signal in a home brew interface. I had unfortunately ran the audio signal and digital rig control in the same cable and the audio cable was picking up the digital. This video helped me find it and I was able to fix the problem and get a nice clean signal. Thanks for all you do. Your videos are great! 73 KG4USQ
That "RF envelope" sure bears a striking resemblance to the "cats eye" pattern that I used to see when I was doing alignment on disk drives. That required two channels, differential input to the scope...
Wish more amateurs would use this kind of care. I detest nasty signals of any mode, not just PSK. Way too many overprocessed signals, as Ben would say, "I can hear your epiglottis bangin around in your throat."
Great video and very easy to follow , will be trying this on my radio. If i need to use a tone to get the envelope as mine doesn’t have a built in one, what hertz tone do you use and is it a single or double tone?
confirmed! a few minutes later while investigating psk31 i remembered a proper AM signal and figgured that ITS NOT AM. however i am troubeling understanding how PSK works. i see the HF carrier and i see some modulation on it. but yet i cannot recognize that modulator signal and where its "changing" the phase. since its supposed to be a "digital" signal i would expect to find some sort of "steps". but i realy cannot find any steps or "sudden changes" yet. guess i need to do more investigation
This was a great video. So, at the last hamfest I got a great deal on a used O'Scope. I set it up connected to the balanced line output of the tuner using the regular probe and connected the ground clip to the ground on the tuner. I do get a signal that is very readable on the back of the tuner, MFJ-949E. But, there is always but, no? I don't get the pretty RF envelope like you get when I hit the tune button in FLDIGI. I got a nice solid tone and it is just a straight frequency out, not modulated. When I do a CQ I can see the waveform and it is modulated. Of course, this is all into a dummy load. Are you using fldigi and if so how do you get it to make the RF envelope?
I don't use FLDIGI. I took a look at the manual for FLDIGI, and it confirms that it puts out a constant, unmodulated tone in the Tune mode. This creates a single, unmodulated RF signal, so what you observed on the scope is normal. It can be used with the ALC reading on your rig to adjust the audio level. I believe that for the video, I simple put the program into TX mode which caused it to transmit an idle pattern which is modulated.
I don't know what a "to 320" is, I am assuming it is your oscilloscope. If you are not getting enough leakage signal pickup through an unused antenna port on the tuner, then yes you will need some type of RF sampler.
@@w2aew ok that what I will try next 320 is my scope tektronix tds 320 iam getting a pattern its just not as nice looking like yours is mine is a solid green Thank u 4 your help love the videos.
@@vencentbauer That's all you will get with the TDS320. This is an early digital oscilloscope, and it doesn't have intensity grading like the old analog oscilloscopes.
@@w2aew ok thats what I was thinking I took some new radios and tested them now I can kinda see what iam looking at I will have to up grade my scope do u no what is a good scope to buy without breaking the bank only working on radios
Analog scopes - no. For modern digital scopes, there is usually a FFT function to view the frequency domain, but you have to recognize that the scope itself may create some harmonic distortion components on it's own.
W2AEW thanks for the great info. This helped me to clean up the signal in a home brew interface. I had unfortunately ran the audio signal and digital rig control in the same cable and the audio cable was picking up the digital. This video helped me find it and I was able to fix the problem and get a nice clean signal. Thanks for all you do. Your videos are great! 73 KG4USQ
glad to be of help!
That "RF envelope" sure bears a striking resemblance to the "cats eye" pattern that I used to see when I was doing alignment on disk drives. That required two channels, differential input to the scope...
fantastic, looks like I will be watching your videos all night. Thanks a bunch.
Wish more amateurs would use this kind of care. I detest nasty signals of any mode, not just PSK. Way too many overprocessed signals, as Ben would say, "I can hear your epiglottis bangin around in your throat."
Thanks, looking forwards to trying this with the SM 220. NL7IB
That it does....that it does indeed! Great video w2aew, as always!!
I downloaded digipan and it does put out a modulated carrier in idle. It worked great. Mahalo!
Nice video again. It will help me set upo my FT817/TS590 for PSK.
Many thanks for this PSK /Oscilliscope Video. It was VERY helpful. 73s
Great video and very easy to follow , will be trying this on my radio. If i need to use a tone to get the envelope as mine doesn’t have a built in one, what hertz tone do you use and is it a single or double tone?
Anything within the audio passband will work - 1kHz would work fine.
confirmed! a few minutes later while investigating psk31 i remembered a proper AM signal and figgured that ITS NOT AM. however i am troubeling understanding how PSK works. i see the HF carrier and i see some modulation on it. but yet i cannot recognize that modulator signal and where its "changing" the phase. since its supposed to be a "digital" signal i would expect to find some sort of "steps". but i realy cannot find any steps or "sudden changes" yet. guess i need to do more investigation
Would be cool to see a vid like this for SSB
This was a great video. So, at the last hamfest I got a great deal on a used O'Scope. I set it up connected to the balanced line output of the tuner using the regular probe and connected the ground clip to the ground on the tuner. I do get a signal that is very readable on the back of the tuner, MFJ-949E. But, there is always but, no? I don't get the pretty RF envelope like you get when I hit the tune button in FLDIGI. I got a nice solid tone and it is just a straight frequency out, not modulated. When I do a CQ I can see the waveform and it is modulated. Of course, this is all into a dummy load. Are you using fldigi and if so how do you get it to make the RF envelope?
I don't use FLDIGI. I took a look at the manual for FLDIGI, and it confirms that it puts out a constant, unmodulated tone in the Tune mode. This creates a single, unmodulated RF signal, so what you observed on the scope is normal. It can be used with the ALC reading on your rig to adjust the audio level. I believe that for the video, I simple put the program into TX mode which caused it to transmit an idle pattern which is modulated.
a PSK Envelope? looks like general AM to me. so PSK is not phase shifting the HF carrier but some sort of audio signal, isnt it?
Hah. The day after I pass my ham license exam, you post a ham-related vid. XD
ABR Industries high-jacked your video. It took some doing to see the proper video.
Which video did they hijack? Do you have a link?
Nice Vid
So we will need an rf sampler iam using a to 320 I can't get a single like that at all using my dummie load on my mfj 941 e
I don't know what a "to 320" is, I am assuming it is your oscilloscope. If you are not getting enough leakage signal pickup through an unused antenna port on the tuner, then yes you will need some type of RF sampler.
@@w2aew ok that what I will try next 320 is my scope tektronix tds 320 iam getting a pattern its just not as nice looking like yours is mine is a solid green
Thank u 4 your help love the videos.
@@vencentbauer That's all you will get with the TDS320. This is an early digital oscilloscope, and it doesn't have intensity grading like the old analog oscilloscopes.
@@w2aew ok thats what I was thinking I took some new radios and tested them now I can kinda see what iam looking at I will have to up grade my scope do u no what is a good scope to buy without breaking the bank only working on radios
Can a Oscilloscope be used as a spectrum analyzer for hf carrier or single side-band to see if there are harmonics in the signal please.
Analog scopes - no. For modern digital scopes, there is usually a FFT function to view the frequency domain, but you have to recognize that the scope itself may create some harmonic distortion components on it's own.
Hi. Just what I wanted to know thank you. Great video.
cool
Hmmm....what's the etch-a-sketch doing at 0.33 in your shack? B^)
Schematic prototyping. LOL
Could be the CNC... ua-cam.com/video/eLdlV3-JaH8/v-deo.html
You did not show how to connect to your radio. How do you connect to it?
There are a lot of alternative - from commercial interfaces to simple homemade interfaces like is shown here:
www.qsl.net/w2aew/psk31/psk31.html
Alright, my new year's intention will be to get a HAM license. It's overdue anyways.