Very detailed video which is very helpful thanks again Peter
@lifeisamatrix59602 жыл бұрын
@TRX Lab would you be kind to let me know what software and hardware you have you are using in this video to tune? I like how this one is setup and the hardware under monitor.
@phantomsurvivor61699 ай бұрын
On most duplexer connections, isn't the high connection used for receiving the signal and the Low connection used for transmitting the signal. Assuming the repeater receives on the high frequency and transmits on the low frequency?
@tedfrisk47307 жыл бұрын
When adjusting a duplex filter, you must connect a 50 ohm termination to the port that is open, and after adjustment you must use a SWR bridge to get the correct point where the filter has its optimal and lowest SWR still with 50 ohm termination on the open port..
@srdjanstanojevic42875 жыл бұрын
Can you please explain SWR bridge? How do you do that? Thanks for the answer.
@andhanwer5 жыл бұрын
correct on terminating the other port properly, it wasn't done here ! simply adjusting for deepest nulls and lowest loss is insufficient without considering return loss also all these multiple rf connector adapters are highly inappropriate another serious consideration is lengths of the coax - ignored here as well poor job this repeater will work like crap
@tedfrisk47303 жыл бұрын
@@srdjanstanojevic4287 With a SWR bridge you get a much greater dynamics and resolution as well as a better control of the impedance in the selected frequency that you intend to tune the filter to, I recommend a very good page about tuning Duplexer and the difference between using SWR bridge, look at W2AEW's site he is tuning with both ways, 73 the SM4PDP
@Jessica980142 жыл бұрын
Great video, explained in great detail
@systemloc7 жыл бұрын
I think it is fascinating to watch a spectrum analyzer while a filter is being adjusted, and see what each adjustment actually does to the attenuation spectrum!
@TRXLab7 жыл бұрын
Yes I agree a vector network analyser is something amazing. 73
@satellite_guy37687 жыл бұрын
Great explanation of duplexors. Excellent tutorial!
@TRXLab7 жыл бұрын
Glad that you liked it. Thank you 73
@9z4clb5 жыл бұрын
Excellent! Been years since I tuned a Duplexer!
@romelinarda16424 жыл бұрын
Thank you so much. Can you do video tunning duplexer with nanovna?
@va3vad4 жыл бұрын
I would like to see that.
@JokoSugi-n1e5 жыл бұрын
Thank you so much, now I understand more about spectrum analyzers, to use tracking generator and cavity filter or duplexers. Amazing in one video you teach and share a lot of knowledge material, hope you are always healthy and blessed 🙏🏿
@oswaldkienapfel8299 Жыл бұрын
I am interested which can-adjustment does what to the notch or the bandpass, even if it is wishy.
@TheRadioShop7 жыл бұрын
Thanks for another great video Peter! I had a duplexer like that on my old Regency repeater. No idea what I did with it. Brought back a lot of memories with that one lol. Have a good day and take care. 73 Buddy
@mikesradiorepair7 жыл бұрын
The Radio Shop It's buried in a pile somewhere. You'll find it when you need it the least. Look for it and you'll never find it. :-)
@TRXLab7 жыл бұрын
Thank you Buddy, yeah I have seen you diy video very good stuff. Take care my friend 73
@TRXLab7 жыл бұрын
Yeah Mike never try to find what you need :^)
@KE0RMАй бұрын
I have a MiniVNA Tiny and would love to know what software you are using with yours. Please let me know.
@patricklim82586 жыл бұрын
Great information on the subject clear and understandble.
@TRXLab6 жыл бұрын
Thanks for feed-back Patrick.
@jacwull17 жыл бұрын
exellent as ever looking forward to many more..cheers peter.
@TRXLab7 жыл бұрын
Thanks for feed-back 73
@jbx9074 жыл бұрын
why there is not dummy load on open port?
@welyeraharjo75716 жыл бұрын
thank you for the informative video about the duplexer. well done.
@TRXLab6 жыл бұрын
glad that you liked it 73
@brianwhelan50937 жыл бұрын
Peter, i agree with some of the other comments: The unused open port had not been terminated with a 50 Ohm load. Most, if not all duplexers need ALL the ports terminated during the tune up process as the unconnected port is still in circuit, despite not being "part" of the tune up circuit! Especially true with the small cavity multi-port duplexers that were originally designed for mobile use! Having said that, great video Peter and hope the new repeater is on air as we speak! Continue with the super work, 73, Brian EI8EJB
@TRXLab7 жыл бұрын
Hi Brian, yes you are right but as you said MOST duplexers needs to be terminated. This type is not vulnerable to it. I have tested it before with and without termination and no difference. In our final test we had both ports terminated tidily and our pre calculated and finally measured results are completely matching. But I see that I should have shown it with both termination loads simply not to confuse viewers and to teach what always is the right way and not what will only work partly. Thanks for comment 73
@brianwhelan50937 жыл бұрын
Wonderful reply Peter and I hope that you did not take my comment as a negative criticism; this was not my plan!! You have forgotten more electronics theory than most (including myself) will ever learn in a life time Peter! Alles gute! 73... :)
@TRXLab7 жыл бұрын
Ah,,... no the repeater is not yet up. I have to work on the receiver as well. Hope I can do a video on crystal temperature stabilisation...
@TRXLab7 жыл бұрын
No No don't worry Brian I'm not superman an do fail as anybody else....
@brianwhelan50937 жыл бұрын
You are too modest Peter! Looking forward to the next video and thanks as always for the detailed and very interesting videos!
@dennisqwertyuiop7 жыл бұрын
Great video as always ,thank you Peter
@TRXLab7 жыл бұрын
Always glad to see you Dennis. Thank you 73
@marioaguirrehelguero21306 жыл бұрын
Congratulations! Great video explanation! much clear and pointfull!
@TRXLab6 жыл бұрын
Glad that you liked it 73
@springtimehappiness52167 жыл бұрын
I like your videos.Very professional and informative.Keep up the good work buddy ! Have a good day.
@TRXLab7 жыл бұрын
Thank you glad that you liked it 73
@MAURICIOFALCAOPY5MZ7 жыл бұрын
Fantastic video Peter, as always!!!
@TRXLab7 жыл бұрын
Thank you Mauricio. 73
@mikegianfrancesco94312 жыл бұрын
The high mhz side for transmitting and the low mhz for receiving please let me know im confused and learning
@allenmarian20057 жыл бұрын
Another great video by Peter. Excellent. Peter, can you do a video on folded dipoles for VHF or UHF base station repeater antenna.
@TRXLab7 жыл бұрын
Thank you Allen! Sorry I don't have the stuff to do a antenna video....
@michaelcarey7 жыл бұрын
Great video Peter! I have often combined these flat pack notch duplexers with additional cavity filters to help with out of band performance, essential for RF busy comms sites. One quick question, what equipment are you using for the spectrum analyser and tracking generator?
@TRXLab7 жыл бұрын
You are right you can improve the performance that way. Thanks for watching Michael 73
@sleeve8651 Жыл бұрын
O.K......! Now I'm really confused ! Another video showed the opposite of how this video described the ports of the duplexer. Here he says that the High side is for the transmitter ? Another video I watched, claimed you should use the Low port for the transmitter ? Who is correct ? Or are the ports interchangeable, as long as you, the Tech/Operator understand how you designate each port ? 🤔....?
@MrSpacebee4 жыл бұрын
Please give some more informations about your measure equipment. What kind of analyser you use? Brand ? Model?
@TRXLab4 жыл бұрын
in video #77 you'll find the answer...
@weirdsciencetv49992 жыл бұрын
Why do you have the other unused port unterminated? I see people terminate the unused port
@k5azebud9887 жыл бұрын
What is inside the Duplexer cans? PI/PI-L networks? (I don't know anything about these) SWR: I would think that 1.5 swr would start to matter @ 440? Thanks, 73
@TRXLab7 жыл бұрын
Hi Bud there are many different concepts how this can be achieved. The best is to google it as it is far to much to answer it all here...Sorry mate. Thanks for watching 73
@k5azebud9887 жыл бұрын
Surprisingly there is little information about what is exactly inside, I only found one example, it was a cavity filter which to me a basically a notch filter. So apparently there is nothing exotic going on inside them...
@englisharcher59197 жыл бұрын
K5AZE Bud not much inside. There is some element (like the other end of that tuning rod) which effectively alters the physical dimensions of the cavity favoring only certain electromagnetic oscillatory modes. It is very much like the wineglass filled with different amounts of liquid resonating at only certain (audio) frequencies.
@jeffwilcox998711 ай бұрын
I like your accent. Love the video.
@leosedf3 жыл бұрын
You are tuning a duplexer without a dummy load on the other end of the filter LOL. Good luck with the performance of it.
@pixeluser82433 жыл бұрын
If I were you, I would technically and socially be careful in choosing my words to Peter.
@leosedf3 жыл бұрын
@@pixeluser8243 you amateurs amaze me all the time
@pixeluser82433 жыл бұрын
@@leosedf Bring your girl and she'll be too.
@leosedf3 жыл бұрын
@@pixeluser8243 I wouldn't expect any other reply from an idiot amateur like you. Now go tune a duplexer without a load lol
@Ibelieve218 Жыл бұрын
not really clear on video if your tuning the high side do you loosen all six ? the high side has 3 adjustments and the low side has 3 adjustments?
@TRXLab Жыл бұрын
This is an iterative setting so you move all the controls over and over again
@FelixLantiguaCamacho2 жыл бұрын
Can HIGH port transmit as LOW port?
@seltenfotog31153 жыл бұрын
Question: Can I run a 5w receive radio on one port and a 50 watt transmit on the second port? (Lets assume this duplexer is rated for 100watts)
@feritosmanoglu39266 жыл бұрын
Great video as always Peter. Thank you for the efforts. Would like to ask what result have to expect if leave the notch and pass frequency little bit missaligned, but match the VSWR more close to 1:1. In other words, which is better: To keep notch not so deep (let say LF at -60dB and HF at -80 or -70dB) and VSWR close to 1:1. New ham here TA1OSN, Ferit. Respect and 73!
@TRXLab6 жыл бұрын
-70 to-80 is a good result so go ahead if you have a good VSWR! 73
@kansas76147 жыл бұрын
Hello, I'm wanting to setup a personal use repeater, Can I use the MX-72 Duplexer to do it? I see the one that you are using is setup high at 438.100 Mhz and low side is 430.500 on the J-unoda duplexer can you do the same with the MX-72 Duplexer? Sorry for the question, I'm new to ham radio. Or how can it be setup using the MX-72 Duplexer. I'm wanting to set it up as a GMRS repeater. I'm wanting to use just 1 antenna if possible. Thanks.
@neostratospey6946 Жыл бұрын
Excellent video! 73 de SM4VFA
@tsu1207 жыл бұрын
I have 2 VHF Motorola GM300s with a jumper cable on the back which makes the unit a repeater. I run 2 antennas for the Rx and Tx. I would like to run only 1 antenna. Can I purchase a duplexer, have it tuned and get rid of the jumper cable? Also, do I have to have a repeater controller just to make the GM300s and duplexer work? I would like to get by without using a controller.
@borayurt667 жыл бұрын
Another great video, I have never seen a duplexer being calibrated before, so it was fun for me. So, amateurs in Germany are allowed to use 12.5 KHz steps in Germany? We are still stuck with 25 KHz here in Turkey.... :(
@TRXLab7 жыл бұрын
Thank you Bora. Yes 12,5 is allowed...73
@hancecrawford7 жыл бұрын
thank you for sharing so more information!
@TRXLab7 жыл бұрын
Thanks John 73
@jacktreble9512 жыл бұрын
Uhf can be vhf?
@you1227895 жыл бұрын
I have a question can a 25 watt repeater handle a 30 watt duplexer or will I have to go at low power
@alessandrozax7 жыл бұрын
Just one doubt..it's possibile to use both of inputs at the same time using a single antenna with a duplexer !? Thank you for your commitment !! '73 :)
@systemloc7 жыл бұрын
Exactly. One is used for recieve, and one for transmit, at the same time. This is the purpose of a duplexer. It allows a repeater to recieve on one frequency and re-transmit the signal simultaneously
@alessandrozax7 жыл бұрын
is it also possible to use both of input on TX at the same time !?
@YO8RZE6 жыл бұрын
Peter, congratulations for your work! What Spectrum Analyzer do you used in this video? Thank you! 73`s, Chris, YO8RZE
@PowderMill3 жыл бұрын
If any public safety LMR folk are watching and reading.... especially if you handle QC2 2-tone sequential paging / DTMF station alerting / etc... Check out the TPI-1005a RF communications device.... It has just about everything in a single package to permit local transmissions of alerting tones etc.. and RF (CW) signal & function generation all in a very affordable (aka cheap - $200-300 bucks?) package. A few KZbin videos have been done on the device, so check them out if you have a spare sec.
@harbselectronicslab35514 жыл бұрын
Probably should have a 50ohm dummy load on the open port.
@andreneumann97816 жыл бұрын
Peter was benutzt du als Spectrum Analyser?
@TRXLab6 жыл бұрын
Hallo Andre, schau mal mein Video #77 dort werden alle Fragen beantwortet
@andreneumann97816 жыл бұрын
Peter hast du schon mal einen ICOM 718 in der Hand gehabt und du die RX Werte eingestellt?
@harveybauss48357 жыл бұрын
Will the transmitter desensitized the receiver at -50dbm?
@TRXLab7 жыл бұрын
If a signal is coming in on the "wrong" frequency it will be attenuated by the filter depth of the filter and if the filter depth is 50 dB yes it will be attenuated by 50dB
@jbx9076 жыл бұрын
i hope yopu do vhf pre amp projects for repeater use, love you videos
@n2pdq7 жыл бұрын
What VNA are you using?
@TRXLab7 жыл бұрын
Hi, watch video #77 and/or #106. There you get all needed informations. Thanks for watching. 73
@jn1lfd Жыл бұрын
You'd have to terminate the terminals not used for measurement with 50 ohms.
@mikebarton93247 жыл бұрын
why cant we just use a switch to disconnect between transmit and receive?
@michaelcarey7 жыл бұрын
A duplexer is needed in a repeater because the transmitter needs to be active at the same time as the receiver into the one antenna. You can use separate antennas for transmit and receive, but you would still need to have some kind of filtering to keep the transmitter energy out of the receiver antenna socket. Two antennas also means two coax cable runs and often more running costs if you are leasing space on a tower.
@harbselectronicslab35517 жыл бұрын
because it you do that it is no longer Duplex......you need to be able to TX and RX at the same time with a repeater.
@justcasey36787 жыл бұрын
This is one antenna repeater system for both tx and rx. The receive signal is needed to pass thru the duplexer and go to the receiver, and at the same time the information is transmitting thru the same antenna. As Peter pointed out, the duplexer will notch out the tx frequency signal at the rx port. If a switch is used while transmit, then the receiver will not be connected to the antenna to receive any signal.
@OleF1127 жыл бұрын
Hallo Peter, schön gemacht! Richtig lustig wird es bei den 2m Duplexern mit 600kHz Breite..Da habe ich schon eine Kaskade von "Ölfässern" gesehen, die man mit der 1/2 Zoll Ratsche abstimmen musste;-) Gruß und 73 de Olaf, DK6KF Nice Work, Peter! Another funny thing is to do the alignment to 2m band duplex filters with 600 kHz bandwith. I have seen a "cluster of oilbarrels" that needed to be aligned with a 1/2" ratchet ;)
@TRXLab7 жыл бұрын
Vielen Dank Olaf, ja da gibt es die wildesten Konstruktionen...., aber der hier ist echt handzahm :^) Danke fürs vorbeischauen. 73
@OleF1127 жыл бұрын
Peter, ich schaue schon von Video 42 an zu...;-) und arbeite mich noch rückwärts. Macht Spass! PS: Falls Du mal Teile aus dem kommerziellen Bereich brauchst, habe viele Ersatzteile zum Spenden..Ich arbeite gerne mit Bosch, Ascom und Motorola.
@TRXLab7 жыл бұрын
Freut mich das es dir so gut gefällt, Olaf...Auch vielen Dank für das Angebot man weiß nie was man braucht. Ich komme gerne darauf zurück. 73
@ce3soc7 жыл бұрын
only problema here is you need used 50ohm in port duplexer for adjust you figure for tracking generetor no is good you need setting with 50ohm terminal 73 Raul
@TRXLab7 жыл бұрын
This topic has already discussed here in the threat down below.. Thanks for watching 73
@alancordwell97597 жыл бұрын
Haha!! I've tuned many of those in my time!!
@TRXLab7 жыл бұрын
Yes that is pure fun 73
@jimerickson18092 жыл бұрын
Flat packs should only be used in portable repeaters.
@markjordan45934 жыл бұрын
This was so long and boring I had to skip through it. Was there a part where he showed how he trimmed the duplexer? I mean the physical box.
@nickphilpot4207 жыл бұрын
great video but you made fatal error, you didn't terminate the unused port so results are meaningless!
@TRXLab7 жыл бұрын
Nick, do you really think we could get our final result as we have seen it if my approach if it is a fatal error? All pre calculated and finally measured results are completely matching. At the finial test both ports were terminated... So my results are meaningless? Are you sure? Thanks for watching 73
@nickphilpot4207 жыл бұрын
hi thanks for replying, I really enjoy your videos & appreciate the time & energy that goes into making them, hope my comment didn't cause offence! Best wishes nick
@TRXLab7 жыл бұрын
No No don' worry I'm always open for discussions. Have a nice day 73
@doccarson632 жыл бұрын
He must get paid per word or something. I can't take it any more! 3 minute of actual usable teaching and 47 minutes of "yeah", "um" and word salad.
@ruthdeguzmant32556 жыл бұрын
Too much talk..next time just tell wharts that thing use for