Yes there's always videos showing you how to use equipment but they never explain how to hook things up and that's pretty important. Good informative video.
@BrockNanson Жыл бұрын
This is great and answers many questions I had... as well as several I didn't know I needed to ask! If only the profs I had back in my university days had been able to present ideas as effectively as Peter does - those years would have been more enjoyable and far less frustrating!
@patrick42285 жыл бұрын
Brilliant! Absolutely brilliant! Thank you for this very informative video. Finally no more guesswork in my mind about the proper way of doing this kind of measurements! 73
@TRXLab5 жыл бұрын
glad that you liked it. Thanks for watching 73
@mikefinn21012 жыл бұрын
Thanks for that very valuable video. I just bought a spectrumanalyser and glad you made this video sure help more than you know. saved me from damaging my new Rigol. Wish others were as kind as you are and donate so much of your expertise to help others. I am so Grateful many thanks God Bless 73s wb7qxu
@TheRadioShop6 жыл бұрын
Thanks for sharing tis vital bit of information Peter. It should help lots of folks out. I see you have the same test radio on the bench I do 73 my friend.
@TRXLab6 жыл бұрын
Thank you my friend for stepping by! 73
@johnc44146 жыл бұрын
Hi Peter. You made the selection of attenuators for different equipment with different input level ratings made sense for me. Thank you. John C
@TRXLab6 жыл бұрын
Glad that the video made sense to you. Thanks for stepping in 73
@larryk4mu2406 жыл бұрын
Hi Peter, a very superb explanation of how to make sure everyone can avoid overloading their test equipment. Great tips to follow. I enjoyed the video very much. 73
@TRXLab6 жыл бұрын
Glad that you like it Larry! Thanks for watching 73
@jansb9845 жыл бұрын
Absolutely perfect. I can even understand the extra time you are taking to explain it all. Sometimes I do tend to fall to sleep but this is due to my work schedule. Seriously, I put a piece of wire into my Rhode & Schwarz FS300 and "listen" to my dummy load on TRX. Regards, vk2fex
@karlmartell92792 жыл бұрын
He sounds like some lost tourist on a sightseeing tour.
@jansb9842 жыл бұрын
@@karlmartell9279 Well - No. This subject is not easy to explain to anyone that is a novice in the subject lesson. I do enjoy it for factor(s) such as remainders of something I may have forgotten over years. There is a balance between benefits of being on the air and doing diagnostic of your own RF equipment. They are both as important and the confrontation here is about the LAB and the RIG or the other way around if you please. Both are just as important as each other. In my opinion, TRX is an essential LAB tool for every Ham who cares and Peter does the very best job to this effect. 73s, vk2fex
@RC-Heli835 Жыл бұрын
@@karlmartell9279 English is not his native language and so ah yah! You have to turn the speed up to 1.5 X. What's funny though it makes the camera angles change rather quick.
@karlmartell92792 жыл бұрын
Simply plug in the cable and press "ON" could blow up your valuable device. So first watch here!
@peterjones32455 жыл бұрын
Another priceless gem for us (old) radio repairers. I guess the same techniques would apply to connecting an oscilloscope to the Tx? Thank you Peter.
@clytle3742 жыл бұрын
Thanks. Good clarification and refresher course
@TRXLab2 жыл бұрын
Thanks for watching
@Rob-du9ui6 жыл бұрын
Thank you Peter. I found the information regarding the maths especially useful.
@TRXLab6 жыл бұрын
Ah okay and I thought that this is more the critical part of this video...Thanks for watching and comment 73
@TheDefpom6 жыл бұрын
Very thorough video Peter, good work.
@TRXLab6 жыл бұрын
Glad that you like it 73
@stefanosimpsi66216 жыл бұрын
Thanks Peter for simple explanation.
@TRXLab6 жыл бұрын
You are welcome Stefano! 73
@musb7482 жыл бұрын
Super presentation! What about the CMS54 R&S ?
@nettrobber2 жыл бұрын
Hello Peter, thanks for sharing. Just a question about the Power calculation, the voltage written on the measuring device is related to as a peak voltage then the power calculation should not be P=(Epk/sqrt(2))^2/Z =E^2/(2.Z) as we are taking this way the Erms value? and not only P=U^2/Z Then for the measuring device accepting only a 3v maximun input voltage, the related max power should be 90mW which is ca. 20dBm Then the attenuation required should be at least 20dBmin? Or that is totally wrong ? ;) thanks
@alessandrozax6 жыл бұрын
Good explanation..other simple solution is inside of your previous video where you have show us how to pick up a signal via inductive way (ex. toroid). Have a nice day !! '73
@TRXLab6 жыл бұрын
Thank you Alessandro. 73
@dennisqwertyuiop6 жыл бұрын
Great video, thank you for taking time to do videos, they are the best
@TRXLab6 жыл бұрын
Thanks for the kind words Dennis! 73
@LeeKirkman883 жыл бұрын
Yes the driver puts out a small amount of power, To drive the output transistors or mosfets so the spectrum analyser picks up the smallest of signals even from the driver.
@Mschasz31293 жыл бұрын
Only wish I had the test equipment you have. But then again I'd have to take a few classes to know what heck to do with all of it.
@TRXLab3 жыл бұрын
LOL, well I guess all different equipment has been used in one or the other video... so you can train yourself ;-)
@bundylovess6 жыл бұрын
Thanks Peter just what Iv have been searching for big thumbs up 👍
@TRXLab6 жыл бұрын
Thanks for feed back. Glad that it is of any need for you! 73
@snellsentinel64856 жыл бұрын
Meny thanks, & seasons greetings kind regards from New Zealand snell
@TRXLab6 жыл бұрын
You are welcome! Season greetings and all the best. 73
@theDaftman Жыл бұрын
Old video i know, been looking for a Watt To dBm Conversion Table like the on in your video, seen loads but not as good as the one you have, any links to the one you have. excellent video as always thanks.
@user-su5sq5ib3i3 жыл бұрын
I love your videos and appreciate them very much
@g1fsh6 жыл бұрын
Thsnks Peter that was very well explained by u. Very helpfull and a great video as always.
@TRXLab6 жыл бұрын
Thank you Garry! All the best 73
@ot7e6 жыл бұрын
Thanks Peter for this usefull video, great tips and very well explained. 73
@TRXLab6 жыл бұрын
Thanks for watching Mathieu! 73
@robertcalkjr.83256 жыл бұрын
Nice lesson, Peter. Thanks.
@TRXLab6 жыл бұрын
Thanks Robert! 73
@berniken65116 жыл бұрын
Nice video Peter very informative as usual.........................Thank you.........................Berni
@TRXLab6 жыл бұрын
Thank you Berni ! 73
@Artelisys6 жыл бұрын
Peter, Thank You for your time! Your videos are just great; could you do a segment on the main pieces of equipment you have in your shop? I have basic electronics background, nothing close to what would be called an electronic technician working in the RF field. I would however, like to know the basic equipment required to repair and align radios up to 30Mhz. Would be nice to include equipment in the 2m and 7cm band too. I see some really affordable equipment on ebay that I could get started in, but would like to know the basics. Maybe a more advanced than your #50 video in regards to a first lab on a budget. Equipment that is required to repair the RF Amps on TX and RX, alignment of radios that are off frequency, alignment of meters and receive (AF, etc). Like I said, I know enough to get in trouble, just need a little bit more to know how to get myself out of trouble. Thanks!
@TRXLab6 жыл бұрын
Hi Billy, yes you are right a good idea for a video but to many projects going on in the moment so I have to postpone it sorry. Thanks for watching and comment 73
@Artelisys6 жыл бұрын
No worries, I do not expect you to drop anything you are doing at the moment; at some point in the future, it would be nice. Thank You!
@stargazer76446 жыл бұрын
41:26 "counter is not heated up" It is connected to an external reference. The counter is dead on.
@robertruth32815 жыл бұрын
What a wonderful presentation. I admire your knowledge and your skills at making difficult concepts look easy. I do have one thing that I can not understand. When using attenuators to reduce the signal, how do you know what the power dissipation requirements are for the attenuators? I will try to describe what I mean. With your 600 W dummy load, which has a -40 db attenuator built in.... you still need 10 more db of attenuation to reduce the 50 dbm to 0dbm. How do you know what power handling is required of the 10 db inline attenuator? It would seem to me that with the RF padded down you are not going to be dissipating much power in the string of attenuators. Is that true or am I misunderstanding? Thank you very much for what you do here. Bob
@The-Weird-Show4 ай бұрын
I want to add a nice spectrum anylyzer to my rodecaster pro 2 for my podcast...
@adhiwibowo488 Жыл бұрын
what is spectrum analyzer do you use? the brand I mean. I saw it was connected to a PC monitor? THank you
@TRXLab Жыл бұрын
Signal hound
@carlospopelier5 ай бұрын
howmuch attenuation in de spectrumanalyzer itself ?
@michaeldotc22546 жыл бұрын
Great Video Peter! I love seeing how the test equipment is connected to the radio. So many videos just show meter readings and never explain how the radio is connected. I do not own a dummy load with a test port but I do have a Bird watt meter with a rf sensing slug. Will that work in place of the dummy load test port?
@TRXLab6 жыл бұрын
Do you mean a sample port? Well you can see signals but you can't do quality y measurements. 73
@mrkattm6 жыл бұрын
Peter nice "back to basics" video, you did a awesome job. One question, do the through attenuators that you demonstrated in your video act exactly like a 50 ohm dummy load or do you need to terminate the through attenuators with 50 ohms when not connected to a piece of equipment?
@TRXLab6 жыл бұрын
Hi Michael, yes it is a 50 Ohm dummy with test port so no need to connect anything else....73
@baghdadiabdellatif15813 жыл бұрын
Thank you
@gixerags7503 жыл бұрын
How do calculate the watt value for a SSB signal for the formula??? PEP AVG ??
@TRXLab3 жыл бұрын
in video #42 you'll find all the answers...
@s7courier5 жыл бұрын
Nice video. Did you build the 600 watt dummy load that is in the video. I can not seem to find any online with test ports attached out oft box. Thanks for a great video.
@TRXLab5 жыл бұрын
No my attenuator is this www.apitech.com/globalassets/documents/products/rf-microwave-microelectronics-power-solutions/rf-components/attenuators/fixed/wmod53.pdf
@andrewverran34983 жыл бұрын
Watched this many times now ..brilliant.. I know you are very bust but at some stage could you address beginners trap of confusion between a tone in the Audio domain vs the tone in the Waveform domain, Mavbe in the 2 tone ssb test and an S9 alighnment... Thnanks in advance.
@TRXLab3 жыл бұрын
Well from my point of view you can use both signal or tone but I admit that tones is more regular used in the audio domain...
@SP9DR6 жыл бұрын
Peter fantastic video as always. By the way, can you tell me what is the model of the audio interface sitting on top of Agilent meter?
@TRXLab6 жыл бұрын
Thank you! Yes it is a Terra Tec Audio-Interface: DMX 6Fire USB. 73
@andrewverran34983 жыл бұрын
Is there any problem with putting say 3 T bnc connectors after the attenuation to send the output to 3 devices, say scope, counter and spectrum ananlser,basically is the attenuated signals dbm value comprimised if split out to 3 peices of test equiptment? Thanks in advance
@TRXLab3 жыл бұрын
no that is not possible since you are still in the 50Ohm world. If you split off your levels on the following meters reads wrong.
@andrewverran34983 жыл бұрын
@@TRXLab i will have to investigate, would be great ti get the same radio output simultaneously to my scope , counter and SA... 73s
@freeman19904 жыл бұрын
Hello, Where I can buy Spectrum analyzer like yours ? I mean the 1 which monitor.
@jerrymoats9715 жыл бұрын
HELLO PETER. LOVE YOUR VIDEOS. IN THIS VIDEO YOU SHOW A HARD COPY OF YOUR CONVERSION CHART. I HAVE LOOKED ALL OVER THE INTERNET FOR A PRINTABLE VERSION EXACTLY LIKE YOURS BUT CAN NOT FIND ANYTHING CLOSE. DO YOU KNOW WHERE I CAN GET THE EXACT SAME CHART AS YOURS? THANKS JERRY
@TRXLab5 жыл бұрын
Hi Jerry, the chart is done by myself. Use this link kzbin.infocommunity
@williamcolvin36096 жыл бұрын
I know you enjoy building your own test equipment,are you familiar with the T747 Tester for microphones. They work great - but I was wondering how hard it would be to add a modulation meter to show the amount of modulation a microphone is putting out. That way you could see how much increase there is over different microphones,stock,noise canceling,different brand,different element and amplified it is hard to tell just listening. Thanks for any help you can give it will be appreciated.
@TRXLab6 жыл бұрын
William you are still in the audio domain so a little millivoltmeter would do the trick. To get more sensitivity sometimes it makes sense to use a uA meter. This instrument will give you the required reading. May be you need an instrument amplifier depending of the source. Some microphones are producing a very tiny signal...73
@williamcolvin36096 жыл бұрын
I understand from Buddy at The Radio Shop - that you have one of the T747 Testers you have modified to be able to connect a larger variety of microphones. I looked for it in your videos,but did not see it. What would be best - to add an external speaker with the meter in that enclosure across the speaker terminals?
@WaterWhiteTuber6 жыл бұрын
Hi Peter (or anyone). OK, I have what may seem like a dumb question. Your equipment has upper and lower signal limits. What happens when you use an oversize attenuator? Does it completely squash the signal and display zero on your equipment or is it possible for the reading to exceed the lower limit of the test equipment and present a risk of harming the equipment? In other words, I think I'm asking: do you need to take bandwidth into account when selecting an attenuator? Thank you in advance.
@TRXLab6 жыл бұрын
Well it is like I have explained it for the counter. If you go down below the sensitivity level of the unit you don't get a reading out of it. For SA's it is more that you reduce the dynamic range too much. Too much attenuation never can harm the equipment but always avoid to much power! Bandwidth needs to be taken into account not to warp your reading! You have seen the sticker on my 1odB attenuator showing 2.3Ghz I believe...If you go higher you warp your reading...
@WaterWhiteTuber6 жыл бұрын
Fantastic. Thank You 73
@theobosters84872 жыл бұрын
did you make the dummyload yourself, can't find a good dummyload with attenuation on the internet.
@TRXLab2 жыл бұрын
no that would not be linear up to 3 GHZ. search for Weinschel
@theobosters8487 Жыл бұрын
@@TRXLab do you have a type number, can't find any Dummyload with the attenuator from weinschel its one or the other but not what you say.
@andrewverran34983 жыл бұрын
Great video...a question....if someone gave me an in line vented barrel type attenuator ,similiar but smaller than the one you are using, if the attenuation value information isnt on the attenuator how can you calculate its value?? Cheers
@TRXLab3 жыл бұрын
you can test it. Put a known accurate level in and simply test the output level. The difference is the attenuation level....
@hancecrawford6 жыл бұрын
peter 100w = 70.7 Volt did you mean 70.7 mv what does dbm mean? very interesting how you derive at the readings from the input to a radio back to are old friend Ohms Law
@TRXLab6 жыл бұрын
Hi John no 70,7 Volt is right for 100 Watt @50 ohm. And dBm stands for decibel milliwatt reference... we never lose the old friend ohms law...LOL 73
@dennisqwertyuiop6 жыл бұрын
one more question, the att. 10 db on the sig hound connected to the dc block,, what is the power ratting on it,,, would it have to be 10 watts ? Thanks Peter
@TRXLab6 жыл бұрын
100W=50dBm-40dB big attenuator =10dBm at the little 10db attenuator . 10dBm= 10mW so no problem at all. The maximum rating is 2Watt.
@ahmadshwayat98405 жыл бұрын
Thanks for the video.
@TRXLab5 жыл бұрын
Thanks for watching
@yv5grb6 жыл бұрын
Thanks, very useful as always, 73
@TRXLab6 жыл бұрын
Thank you Eduard ! 73
@dixsusu6 жыл бұрын
Hi Peter ,great video, what spectrumanalyser are you using please?
@TRXLab6 жыл бұрын
All you need you find in video #77
@itdevops5 жыл бұрын
Hi what do you think the hp8922m for test ? For radio. Ty
@sethlavinder6 жыл бұрын
So what exactly is that “test port” dummy load device called? Is this simply a fixed attenuator designed to dissipate a 100 watt RF signal? Where do I find one that doesn’t cost more than my spectrum analyzer did? I tried to google such a device and Pasternack came back with what I believed to be the device for about $1,700 which is what I paid for my Siglent analyzer back in May 2017.
@TRXLab6 жыл бұрын
It is called Fixed Coaxial Attenuators with test port. You can get it on different power levels . This devices are expensive and yes they might be even more expensive than a low end SA. Look around on ebay or HAM fairs...73
@jfrede19766 жыл бұрын
Nice sticker on the Clock ;-)
@TRXLab6 жыл бұрын
Yeah I'm burning the midnight oil
@radiotestfr12326 жыл бұрын
Hi, thanks for all. Do you have a link to the conversion table ? Pls. 73's
@TRXLab6 жыл бұрын
Hi Stephane, use this great web page...www.random-science-tools.com/electronics/dBm-Watts-volts.htm
@Standing-Wave6 жыл бұрын
Another brilliant video!!!!! 73 De N0ZFG
@TRXLab6 жыл бұрын
Thank you glad that you like it 73
@yTb28010823312 жыл бұрын
Good evening! May I know the model of your S.A., please ?
@TRXLab2 жыл бұрын
Hi Andrea, in video #77 you'll find all the answers 73
@fiszczenko6 жыл бұрын
Hey. Good explanation :) Can you tell me model of that dummy load?
@TRXLab6 жыл бұрын
Thanks! While I was preparing the video I was looking for the sticker on the dummy but it is gone and I can't really remember the brand. I believe it was a Weinschel... 73
@TKomoski6 жыл бұрын
Very interesting demo *Peter* , is it preferred to use a DC block attenuation pad that is close to 0 dbm? Also what is the purpose of testing a radio at it's maximum power level not at 10 db down? I like the demo's but I much prefer the repair video's that's just me. Thanks again for latest video and look forward to the next installment from TRX Bench, *_Cheer's 73_*
@TRXLab6 жыл бұрын
Hi Tom, the DC block should have no insertion loss and we should always test radios at full power as there they show there real behaviour... And repair videos will come as well :^) Cheers and 73
@reallybadaim1186 жыл бұрын
Nice watt meter to!
@TRXLab6 жыл бұрын
Yeah a very nice LP500...
@TheRangerDale6 жыл бұрын
Peter could you pass on the Program your using on the computer as a SpectrumAnalyser ? By the way good video well explained .. Email via QRZ ..
@TRXLab6 жыл бұрын
Hi Dale, you can download the software on signal hound web page for free. signalhound.com/ But you need a signal hound spectrum analyser to use it...73
@israelhershkovits56756 жыл бұрын
It is a real high le el rf skilled information 4z4RE
@TRXLab6 жыл бұрын
was it to complicated to follow? Thanks for comment. 73
@berndreiner71596 жыл бұрын
Warum klebst du uhrzeit und datum am Bildschirm ab... 😐😐😐
@ichbinsnun91404 жыл бұрын
Es ist so anstrengend, diesem so schlechten Englisch zu folgen. Mach es doch einfach in Deutsch. Right?