I'm a radio and electronics enthusiast that has had a passion for RF and Hi-Fi for pretty much all of my life. This channel is all about documenting my repair adventures, sharing knowledge and maybe helping out someone else working on similar equipment. Please like share and leave a comment if any of my videos resonate with you. 73 from Andrew VK3USA / VK2XXL
As follows mate: au.mouser.com/ProductDetail/Cornell-Dubilier-CDE/104MWR102K?qs=3tP%252BN51vMXeSMeSnaqku6w%3D%3D&countryCode=AU¤cyCode=AUD And au.mouser.com/ProductDetail/Nichicon/PPA2203100KJ?qs=vmHwEFxEFR%252BVpyxQ9DC4gQ%3D%3D&countryCode=AU¤cyCode=AUD
Your tx signal sine wave needs to be a lot sharper. I run a 220 also, and granted I have outboard processing going on from my rack. But I utilize the band scope to give and tune your audio to studio quality. The mc50 with processing is lively and punchy with a bandwidth of about 3.4k. 4k is better to the listener and even 6k which I can get out of my Orion 2. 4k however is the favourable choice so as not to take up unnecessary bandwidth on 40mtrs. I use an MXL770 condenser mics and yes different mics will present an audio pattern of variable kinds. But my point is even when you think that looks good, slim out your scope to a thin line of focus. Turn off your processor, key your mic at power and observe a clean audio signal as opposed to fat and lumpy. You'll sound like the BBC, and the band listeners will thank you for such a clean signal. Use of Kenwood in the past here to with now yaesu, Icom and ten tec gracing the bench. But each tx gets the same audio clean up routine no matter what. This is great practice in the amateur arena where we are continuing to learn constantly from each mans station. Thx for your video!
Thankyou as well! And yeah have a look at part 2 on my channel when you get a chance (just uploaded) and see what you think of the pattern on there. In this video the focus control was not working due to R-175 going open circuit. I think I was able to achieve what you're talking about and indeed I've had many compliments on air. The scope now has a much sharper reading and I did readjust the mic gain and compression settings as a result. The other day, one of my regular contacts on 20m thought I sounded like Barry White when I came up on this set up lol.
Narr mate, in all of the hybrid gear the shafts themselves are grounded and have no connection to the circuits. Their only purpose was cost cutting on a large manufacturing scale. K4EAA wrote a good post on the subject.
What a beautiful setup when I bought my ts-530 I just missed out on the monitor in retrospect I wish I had gotten it but I have all the rest on the lineup, the external vfo is a handy add on ! De n9xvt
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All knobs to the right should fit in just fine with the radio that had the 11 meter modification-thats standard operating procedure for that band here in the US it seems
@@VK2XXL Same here-if you are going to get on the air-sound the best you can no matter what band of frequencies you hang out on-in the US the fellows that have to modify their 11 meter set for obnoxious audio thinking it sounds great-its termed "putting it on the bench to clip and peak it"
Tnx. Pertinent to me. I have a SM220, and a Yaesu YOxxx monitor scope. Both suffer the same issue. After about 30 minutes the traces cease. Power down for a few hours and all is ok for another 30 minutes. I need to investigate both.
Yeah and I've just verified R175 the 1 Meg Ohm resistor is completely open circuit in mine and obviously the cause of the trace issue. Waiting on replacement parts. I poked around all other resistors and all are in tolerance. It looks like the wattage might be a bit underrated. We'll see what the thermal camera shows when I power back up :)
I used a larger wattage rating on mine. I felt the same way, and if the intensity is turned down which it is in a dim environment it might Be drawing more current
@@steveberg3014 That makes sense. New parts turned up today. Didn't get a chance this evening but I'll get around to doing the repair within the next couple of days. Really keen to see how warm that resistor gets. Part 2 out hopefully by the weekend :)
I had same focus problem. R175 1 Meg resistor had went bad and replacing it solved problem. It changed value but don’t remember which way. You probably cleaned focus pot but saying it anyway.
Hi Steve, no silly suggestions at all on my channel :) Yes I tried cleaning the pot and figured something must have gone out in the circuit. I'll check that resistor and see what else may be out of tolerance. I'm guessing both yours and mine increased in value. So might as well grab the schematics/parts list and check em all. Something is definitely acting up with the intensity control as well. Maybe the same thing.
Месяц назад
Nice unit, although it really looks like the trace is out of focus. You lose some resolution because of that. 73, Bert, VE2ZAZ/VA2IW.
Thanks Bert, yeah noticed that and will be doing some further investigation. Unfortunately adjusting the focus control on the front panel doesn't really help it that much so more work to do!😏
I had a Kenwood TS-430S and matching power supply PS-430 that I gave away when I got my Yaesu 991a. I had done corrosion control on the cabinets and repainted them and added an external power supply fuse mounted in the rear. Nice job on that restoration. Cheers & 73 from K9POW in eastern TN
My dad and I had one of these when I was young. It was a great radio, but eventually the frequency started to randomly go all over the place. We'd take it apart, clean various contacts, and put it back together again. It would work for awhile but then the problem would start up again after a few weeks or a couple months. We could never figure out the issue. Maybe today, with the Internet, we would have googled it. Too bad I don't have the rig any more.
It's not that bad. I've seen far worse. The screen grid caps, cathode resistors etc are mechanically anchored and not moving anywhere. I would have done a much tidier job if it were me. The majority of the radio is untouched/as it was when Kenwood made it which is what I care more about. 110 plus watts on all bands including 10m.
I have owned an FTDX-10 for about a year - really love it. But I have just purchased a new TS-590SG just to have a superhet radio on the bench. If someone released a new boat anchor like the FTDX-5000 / IC-7800 I think many who appreciate lots of controls and no SDR would buy it.
I need an advice. A red wire has become loose on the front left switchboard. can anyone tell me to which pin of the switch (must be the PO or the NB Switch) it belongs? I have absolutely no reading on the S-Meter when set to PO (Output is about 50Watts up to 80Watts according to the display of my tuner). IC is okay and shows useable values.
Try having a look at the schematic. The service manual should also have a wiring diagram from memory. If you still get stuck, look me up on QRZ (VK3USA) and send me an email. I'll open mine back up and get some pictures to you. But try the schematic first as I'm very flat chat out here. 73, Andrew VK3USA.
Hello Andrew. Thanks for another excellent video. Sharing you experience when troubleshooting and repairing these classic radios is most helpful. Every detail counts. I scored an 830S that receives but yet to test on TX. Thanks again Andrew for sharing your experience. The radio sounds fantastic. Hearing you 51 this morning (12:15 UTC June 7 2024) on the Sothern Cross Net. Take care. Mike VE3XLF
Thanks once again for watching Mike and for the report on the Southern Cross net :) Another video will be coming out shortly where I get into a TS-820S :)
@@VK2XXL Hello Andrew Once again I appreciate you sharing your problem solving approach. I learned much from your video. We learn much from watching competent technical people like yourself walking us through a solution. Take care and all the best. Mike VE3XLF ps . Looking forward to the AR 88 video
I know this might seem strange to you if you're not used to electron tubes. When under load and heating up, the 12BY7A would intermittently short out one of the grids (can't remember which one) to ground which would pull down the supply rail. In turn this affected the rectifier unit affecting the rest of the radio. A new driver solved the issue. Placing the old driver back in the issue returns.
@@g1cpu Neither did I for a while! The only thing that gave it away in the end was that it only went intermittent when transmitting and not right away. Only when something was warming up.
If it has one, watch for that pesky "fix" switch for the fixed crystal. (that no one ever uses). The frequency will warble all over the place when corrosion enters this switch. The "fix" is to push the "fix" button, again and again and again. Once the crud is gone the radio will operate normally again. Also, I LOVE vfd frequency displays. I wish they kept them longer. Beats the heck out of crummy LCD displays any day. On side note, DON'T let contact cleaner come into contact with the plastic case in any of these kinds of radios or you'll be sorry like I was. Take care and 73.
That's the input power to the final section (different measurement in the old days) But that still equals more than 200 watts pep output. But I never run it any harder than 150 max. And even less when I have the FL-2000B amplifier hooked up that I was lucky to get not long after I made this video :)
I know I am asking a lot of a manufacturer to keep all of those parts on hand in case I want to replace or repair. Just think of the huge inventory necessary or at least what I wish they had. I think eBay has grown up and is almost mature now to order from... Those parts that are taking up space on your shelf. Someone will need soon but the manufacturer can't keep them all.... And what bad things are happening to the chip makers who are making a chip that had 1 application uses up and the next chip is not replaceable.
By being very old ham, I can now see the radios I bought brand new 30 years ago I now see built to last about 20 years, actually I think most things like cars and refrigerators have a limited lifespan built in also. Everyone who knows something about stuff that is 100 years old knows how well built it was built back then. the entry of China into ham radio market has ruined the Japanese radios forever. Now ham rigs are like computers let go out of date every three years. When I can buy K3 technology in a Chinese radio that is not as pretty but is inside good performance... WOW The era of super nice big Japanese rigs is over. I guess I own the last of the big radios== I have an FT DX 9000, ICOM 7800, and sold the last alpha I had. By the way, the ICOM 7851 looking closely. Is almost a lab instrument. It is definitely the last big ham radio, so get a 7851 as soon as you can because the market is not supporting it either---- get the dealers last one or even a dealer demonstrator. I know that at my age the page has turned and I had better move on to the Elysian Fields and hope my successors can hold the band spaces.
It's a shame to see ham radio going the way it is. Sadly I think we're seeing the last of traditional Superhet designs. I laugh at people spending $10,000 or more on SDR radios that don't even have an inbuilt screen or controls. 'Pure Signal' the latest fad where the SDR manufacturers have supposedly found a way to cut off the bleed through on either side of their transmission. Clearly the people opening their wallets have never heard of how Collins solved this issue way back in the 1950s with their Mechanical Filters! To add insult to injury, these 'Check Book Ham's' buy LDMOS Amplifiers and drive the absolute living s$%t out of them with horrible distortion, effectively nulling the advantage of their so called 'pure signal'. Try to tell them and they just abuse you or won't talk to you. The Icom IC-7800 and 7851 are the only rigs I would gladly pay the big bucks for (as I did with my 7800). Yeah I plan on getting the 7851 within the next year or so.
I wave at you Andrew from down South (ZS1WC). Thank you for the nice video. What a sound mate. I have an IC7610 in the shack. How would you personally compare the 2 rigs? I think the 7610 is noisier and prone to static and noise we get lately due to solar panels and inverters. 73's
G'day mate, yes by their very design full SDR radios will always fair worse under tough conditions in noisy RF environments. The IC-7800, my Drake TR7A and Collins KWM-2A always beat any SDR radio hands down in noisy environments. Although the KWM-2A is at a disadvantage without a noise blanker. You can still run external band pass filters to help, but the FPGA in SDR's will never compare to good old crystal and especially mechanical filters. That's where the 3khz roofing filter in the 7800 is so powerful especially.
