6 ай бұрын
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@st.alexiev625 6 күн бұрын
Great job! Thank you for sharing.
@Darrell_Coquillette Ай бұрын
I know this video is a few year old, but I just wanted to chime in and say that i was giving the same repeater and It came with an extra RF board. I know the extra needs repair, but I haven't had the time yet to check if the repeater is operational. Thanks for the video and I will save it for future help in repairing the one I have here. 73 de N9JOD
@dylanschulz2404 Ай бұрын
Nice work!
@loueckert4970 2 ай бұрын
Good job and tnx for posting your work. 73 de KT1R Lou ex-HP/Agilent/Keysight tech support engineer specializing in network analyzers.
@tapaschakraborty3961 3 ай бұрын
Ok Nice de VU2TKC KOLKATA INDIA
@robbehr8806 3 ай бұрын
I've got two of those! Thanks!
@brianattaway2474 3 ай бұрын
Wow. What a great job on a demanding and intricate project.
@KA9DSL 3 ай бұрын
Did you do a return loss measurement? You'd be surprised by using it to adjust coupling loops and minimum line loss and max q using a VNA.
@rubidiotesla4458 3 ай бұрын
Very good
@rubidiotesla4458 3 ай бұрын
Could I send you your email for any questions?
@rubidiotesla4458 3 ай бұрын
Is your explanation very good?
@GMT439 6 ай бұрын
LED's for the Easily LED. There are none in my house. Fake Light, Fake Spectrum and designed to not last long just like everything else currently.
@n3sdoham322 6 ай бұрын
Hi GMT439 We used incandescent bulbs for everything as my wife hated the light from the old curly fluorescent bulbs CFL. The LEDs are nicer and safer then those CFLs, but I agree the LED spectrum is blue and washed out. The LEDs are more energy efficient and make less heat, but we still have and prefer filament bulbs in a few places.
@quangmi3402 9 ай бұрын
Teacher, let me ask you, using this program, why when I test the audio output, while the millivoltmeter is Vmrs=775mv, this software only shows Veff=13m and Vp-p=46m?
@n3sdoham322 9 ай бұрын
Hi Quangmi3402, There is a calibration of amplitude factor that can be changed under settings, and this will compensate for different sound card variations. I tried to duplicate your results, and I am getting Vp-p=46.02m with Vf of 16.27m, which does not match your measurements. I'm not sure what the program is doing here. I am using internal signal generator at SINE, 400hz, and amplitude of .023, with calibration value set to 1.0 v/div. Vrms of 775mv should equal 2.192 vp-p It appears in my setup the Internal Signal generator amplitude is .5x of Vp-p with calibration set to 1v/div. and using a different cal of 1.414 v/div, now the generator output is scaled to RMS, Gen chan 1 amplitude 1.0 and the scope reads p-p 2.828, and veff 1.0 which the math works correctly in my setup. You input .775 rms according to your meter, which should have read 2.192 Vp-p, but your only got Vp-p .046. I would calculate a calibration value of 47.65 v/div to compensate for your sound card. I would also think you would want an external attenuator or volume control to reduce the input signal to avoid clipping on the sound card input, and scale your calibration value accordingly. Let me know what your results are. Good luck and happy experimenting.
@SpinStar1956 2 жыл бұрын
Hi there! An elderly ham with 2 bad REP-200 20W and a 30W units contacted me to see if I can fix them; saying they don’t do “anything.” After researching what I think are his models, I notice that there is a EPROM on board. This would be a similar dilemma as your PLL uC. Did Hamtronics ever release any source/binaries given the owner’s situation? I did not see anything on Repeater-Builder. 73…
@n3sdoham322 2 жыл бұрын
Hi SpinStar, sorry for the delay in response. I am aware of the CPU on the boards. Hamtronics never released the source for these chips to my knowledge after the owner passed away. The PLL synthesizer frequency controller U2 is a serial controlled device to steer the frequency of the master oscillator. If the CPU is zapped, the PLL won't get programmed, and I suspect the Master Oscillator will just sit at 143mhz, or so depending on the slug tuning. I'm unaware of anybody who has the code to generate a replacement CPU. Its a Moto 68HC705 or MC9S08PA4 according to the schematic, which in checking DigiKey, I'm seeing that this chips are Obsolete, zero stock, but Mouser has a few. These are internal rom/prom one time programmable CPUs. In theory a replacement CPU of another family could be programmed to make the serial stream to the PLL, which I expect only needs to be setup once on power up or reset to set the internal divider registers. I have done repairs on a number of ham systems that have failed over the years. Hamtronics, spectrum, maggiorie, tend to blow the 5v or 8v regulator first, then the 12v transistors tend to be the culprits after the V-regs. In particular the smaller transistors, oscillators, multipliers and pre-drivers tend to be the weakest links. I've met Kevin from Repeater-Builder at one of the club meetings in Butler PA. The Repeater-Builder guys are a good group of hams providing into for keeping the old gear still running!
@SpinStar1956 2 жыл бұрын
@@n3sdoham322 well it sounds like the Hamtronics guy was a brilliant engineer especially given the timeframe. I believe the REP - 200 uses a 6803 Motorola Micro computer. So I may be able to disassemble some of the macro code and I do not think that it controls any PLL functions as you described. With this being the case if my frustration level even gets up by a slight amount I will simply create a new micro controller to run the transmitter and receiver. I do want to thank you for taking the time to respond and the information and also the reference to repeater-builder as I have been using some of their technical references so far. If I find out anything definitive or get somewhere, I will get back with you just to let you know how things worked out. We certainly don’t want the repeater system to die or lose the repeater pair as some of the nearby big cities would be more than happy to suck them up even though they have a pile! Thanks again and 73…
@n3sdoham322 2 жыл бұрын
@@SpinStar1956 I was on the wrong page, I'm thinking the radio modules, and not the controller. I've no experience with any of the Hamtronics controllers. Sadly, many of the controller manufacturers are out of business. CAT,ACC,NHRC... One of my favorites, MCC Micro Computer Concepts still appears to be in business, and Ron makes a dandy little controller, RC-100. N9EE his website link, www.mccrpt.com links to face book. I also have used ALLSTAR PC software controller using a RIM Repeater interface module and running linux. Best wishes in reviving the controller!
@SpinStar1956 2 жыл бұрын
@@n3sdoham322 Well thank you. I still found your video dealing with the RF section very interesting. I’ll just have to see what happens but appreciate your help. 73…
@jbx907 2 жыл бұрын
i dont think nanovna has enough dynamic range to see the notch, or use the nanovna for bandpass response and returnloss reading and read the notch with my cheap Chinese spectrum/duplexer tuning tool, it can only do vhf and uhf thou. it can only read the notch hehehe
@jbx907 2 жыл бұрын
its just offsetting the oscillator signal, can call it amplitude modulation, nor multiplier .
@jbx907 2 жыл бұрын
wow that's vintage <3
@jbx907 2 жыл бұрын
no actual normalization on D6?
@n3sdoham322 2 жыл бұрын
Hi James. Perhaps, but I did not find a normalization function in the software I was using.
@jbx907 2 жыл бұрын
@@n3sdoham322 looks interesting product anyway
@jbx907 2 жыл бұрын
i have these duplexers, i dont have the original pigtails, did you measure the pigtails thanks
@n3sdoham322 2 жыл бұрын
Hi James. I believe I did measure the coax. Let me check my notebook and will post.
@jbx907 2 жыл бұрын
@@n3sdoham322 <3
@n3sdoham322 2 жыл бұрын
@@jbx907 I realized I put my notes in a bag and included them with the duplexer. But you were not the first to ask this question, so I'll repost my old answer: I have a couple of the old cables with the N connectors still intact. Overall they measure 27cm from tip to tip of the N connector. With 20 cm of Rf 142 coax visible between the connectors. I estimate 24.2 cm of coax dielectric including what is inside the neck of the N connector. The interconnect cables between the duplexer and the Repeater are approx 50cm in length, and trying longer / shorter, did not seem to effect the isolation noticeably. There is a N Female mounted to the triangle plate with 2 cables exiting it. I could not locate a replacement, so I took it apart and cleaned it well, removed the old cables and reused it with no problems. If you read other comments I responded to, the length is close to 1/2 wavelength in coax at 66% velocity, but trying longer or shorter ones did not effect my tuning or loss significantly. 144/220 duplexers, the coax length will skew the notch frequency up or down.
@jbx907 2 жыл бұрын
@@n3sdoham322 i got this duplexer with a rg8 size pigtail the didn't look original in length, it was very hard to tune, i changed with an different rg142 pigtail and the tuning seemed to change and improve, i knew it was the pigtail causing it. thank you very much. so you would approximate 1/2 wavelength of freq of operation x VF, are all rg142 66%? i have problems in getting the notches aligned to form a single deep dip with random pigtails, it has to be pigtails that s causing it, even on the pass band has two humps that wont align perfectly. thank you again, ill try making these pigtails, i for got, my duplexer only has one port each can, i am a subscriber and you have cool videos, thank you again
@robertst-laurent6452 2 жыл бұрын
Excellent idea ! Suggestion: Use the directors that go on the nozzle to restrict the area receiving hot air. One nifty trick I imagined and use with my Hakko desoldering station to hold the hand unit: Think of the hot air handle as if you were placing a microphone in front of a guitar. Use a regular microphone boom stand with a microphone clip (clothespin style) to hold the hand unit. Turn the hot air nozzle facing down and move it over what you want to ‘desolder’. You will need: 1 x microphone stand, $ 24.99 CAN 1 x microphone clip support (clothespin style), $ 6.99 CAN For under $ 31.98 (Canadian dollars) you get the very best value to hold your hot air handle. (Third attempt to post my comment sorry if all 3 come on screen, the hyperlinks that I removed on this version, seem to be unhallowed here)
@n3sdoham322 2 жыл бұрын
Hi Robert. Excellent suggestion! I have a flex gooseneck around here somewhere... thanks for the idea!
@mariopadilla3086 3 жыл бұрын
Nice work, I am looking for a software to generate a pure tone with 1 more hertz than the detected signal (my fundamental frequency) to generate a strobe light with my voice to see my vocal folds, could you do that? I think that it only needs a few code lines and would help me and another ent doctors to analyse the vocal fold movements. thanks.
@n3sdoham322 3 жыл бұрын
Hi Mario, Sounds like in interesting application, but I did not write the software so I can't add the modifications your request. The software was written by Christian Zeitnitz, his website is www.zeitnitz.eu. He has contact info on his website and might be able to do what you ask. What I will suggest is to see if you can use the stereo frequency generators to create a tone in headphones from oscillator A and drive an LED strobe with the same pitch using Oscillator B, and have the patient sing a matching or near matching note with the headphones while using what I would describe as a dental mirror with the strobe LED on the end of the dental mirror. You probably have specialized tools for this, but thats my best idea at the moment.
@n3sdoham322 3 жыл бұрын
My apologies for the glitches in this video. I was using different software to edit and compress the photos and vid clips, and it either hung, went wonky, or glitched during multiple rendering attempts. This is the best of several attempts. It's not a high quality vid, but intended to be informative and educational and I think it meets that goal. 73 N3SDO
@cobrasvt347 3 жыл бұрын
Nice job. 👍 Good as new. Edit: Probably better than new. 73
@jakeblues3676 3 жыл бұрын
Had a similar issue with a 220MHz duplexer when a more experienced friend whos also a Broadcast Engineer suggested using TSP to clean out the cavities, I of course was hesitant. We picked up some liquid TSP took the loops out and poured in the TSP, then shaking the cavities all around up/down back/forth after a few minutes (maybe 20?) we emptied the cavities and then using a water hose rinsed out the cavities and hung them upside down for several hours until they were dry we reassembled the duplexer and swep them. AMAZING! the TSP did the trick without having to completely take the cavities apart, they tuned right up on channels and are in service working as expected. I now have a 440 BpBr Wacom Duplexer like the one in this video that may need to get the TSP treatment, I may do a video of it because its so weird to think of such a thing. However, what many people do not know is Hewlet Packard Service Center that was in Fullerton California used a similar treatment on dirty equipment coming in for service and repair. One of our Reserves worked there and gave me a tour of how they clean equipment. Once the equipment was fully evaluated they would send it over to the Cleaning area which consisted of a bath in Simple Green (YEP I KNOW, you don't believe me) after a bit of time they used a high pressure washer that sprayed distilled water washing out the simple green and all the gunk. The equipment was then blown out with a compressed air and then baked in a large oven at a temp that did not harm the equipment but made sure all the water was out. I saw this with my own two eyes and couldn't believe it.Thought I'd share my experience. 73's WA6HYQ
@n3sdoham322 3 жыл бұрын
Humm... TSP.?! XYL has some of that. I have some 220 cans that need some help. May try some externally on the screws. Thanks for the idea.
@n3sdoham322 3 жыл бұрын
I used to water wash PCBs after SMT chip rework with water soluble flux back in the 90's. Yep, drying was the key.
@TBizzell68 3 жыл бұрын
I've always been curious what was inside these cans, I thought they were more complex and oil filled. Thanks!
@n3sdoham322 3 жыл бұрын
No oil, but definately a powerful magic spell!
@yankeebravo 4 жыл бұрын
Could you help me on it? I have same duplexer. i need the lenght of cables. between the cavities and to the radio TX RX.. frequency here is 439.650 434.650
@edbathgate5680 4 жыл бұрын
Ivan, I have a couple of the old cables with the N connectors still intact. Overall they measure 27cm from tip to tip of the N connector. With 20 cm of Rf 142 coax visible between the connectors. I estimate 24.2 cm of coax dielectric including what is inside the neck of the N connector. The interconnect cables between the duplexer and the Repeater are approx 50cm in length, and trying longer / shorter, did not seem to effect the isolation noticeably.
@edbathgate5680 4 жыл бұрын
Got me thinking... 444.250 / 449.250. I was trying to calculate the length of the coax, in terms of wavelength including the velocity.... They are near halfwave length coax. 150/f * .695 (velocity of Rg142) and I get 23.4 cm. The coax is a .9 cm longer at 24.2 cm. So I am not sure exactly how this length is calculated, or if its supercritical that they be exactly 1/2 wl, or if close enough will do.
@edbathgate5680 4 жыл бұрын
I have had best success tuning duplexers using the coax that is going to be used with the transmitter and RX. Marking which one went were with tape or a permanent marker pen. Best wishes!
@yankeebravo 4 жыл бұрын
@@edbathgate5680 Thank you very much E. I bought this used duplexer from a person who wanted to know what it was about, LOL. it came with just one cable that has exactly that measurement that you said. Duplexers typically use 1/4 wave between the cavities. isnt it? I calculated, it wouldn't work, the distance between the connectors is much greater. so I started looking on the internet and found you here.
@yankeebravo 4 жыл бұрын
@@edbathgate5680 this result of approximately 1/2 wave was what I also got next. taking into account that it has the distance to the loop etc ... I was a little lost. I saw in an old WACON advertisement the recommendation to respect the cable measurements and not modify them. But I didn't get to do tests with different measures to see the behavior with different measures. I think I will do that later
@n3sdoham322 4 жыл бұрын
I am not sure who or what trap town hnh is, but you have a very bad reputation as being a spam engine. Tell me something about yourself?
@physics18bravo 2 жыл бұрын
where did you get the winnwt4 software?
@n3sdoham322 2 жыл бұрын
@@physics18bravo Hi Luis, I don't recall just where I downloaded it from. I think I found a link on a ham radio group.