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Thread: SG237 smart tuner issue

  1. #1

    Default SG237 smart tuner issue

    I have emailed SCG for support on this SG239 issue, but they never replied. This fault is not mentioned on their triubleshooting guide. There is also an errata on their manual, but, they did not reply! Ny first and last SCG buy!

    My SG238 is not working:

    Installation: Kenwood Transcuever TS850S - 10 feet of 50 ohms coax to roof- SG239 feeding 29 feet of 300 ohms ribbon cable, to a 140 feet loop.

    SWR varied from 1:1 to 1:2 on all bands from 40 m to 10m

    Recently, I managed to tune this loop on 80 m, and gave me an almost 1:1 match. Changed frequency to 20m, got 1:2 , but, when I changed back to 80m, I couldnt get any decent swr, struggling to find proper tune.

    At one point, I cannot remember when, I could get the usual low swr on transmit on any frequency, ( not sure on 80m) but, I could not hear any signals on recieve on any band.

    Troubleshooting;

    The situation now, using a lamp as a dummy load:

    Switch DC power on, ( with no RF in, switch on auto ) one relay click- auto LED on
    With about 50 watts RF in- all BITES LEDs light up, and stay on - dummy lamp, momentarily at full brightness - then a single relay click- and the dummy lamp dims, but still some low light.

    Reset button, but, nothing changes.

    Some relays have visible contacts and could not see any welded contacts.
    Capacitors C21/73/74/75 seem to be ok, unless they leak on load.
    Relay contacts of K16 to K21 tested open

    The schematic shows A1 diode ring modulator ADE-1 as having 8 pins, when actually, there are only six pins.
    The schematic shows the input at pin 1 and 8, when pin 1 is ground on the specification sheet, and pin 8 does not exist!

    Can you help please?

  2. #2

    Join Date
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    Hello Pulu,

    I clearly don't know which SCG ATU Model Number you have. First you mention the SCG-237, then the SCG-239 and finally the SCG-238 which doesn't make sense. I've never opened up a SCG Product to troubleshoot but I'm guessing it has a Microprocessor as the brains of the design. If you did not follow SCG's Installation information, it's anyone's best guess what you might have blown in that ATU. I wonder why you didn't pick up a telephone and call SCG directly instead of coming to this website and bitching about their Service or lack of Service. Bad mouthing SCG will not win any brownie points ... Ok, you sent two emails into SCG and they haven't responded yet -- You're NOT their ONLY Customer -- Face the Facts!

    Dan
    WA9WVX

  3. #3

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    Wow, Dan! Ease up! Your response was way out of line. I can't offer help concerning this problem, but I hope Pulu feels welcome and posts again.

  4. #4

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    EZNEC says the feedpoint impedance of a 1/2WL loop (40m loop used on 80m) is 10000-j30000 ohms. What voltage does it take to push 100 watts into that impedance?

  5. #5

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    Quote Originally Posted by essbee View Post
    Wow, Dan! Ease up! Your response was way out of line. I can't offer help concerning this problem, but I hope Pulu feels welcome and posts again.
    Well Excuse Me! I just wanted to know why Pulu came to this website started complaining about his SCG Product. As a manufacture, SCG probably receives 50 to 100 e-mails a day so they have to set priorities especially if any of their products are sold to foreign governments, then you must realize that there are just maybe two guys doing the correspondence and one might be on a vacation. I know a guy in Ft. Lauderdale, Florida who waited a month for a technical reply from SCG and he's a Land Mobile Two-Way Radio Dealer. I can tell that You essbee have never worked in a communications company to know what is going on but I have and the company I worked for was Motorola, Inc. I went out to the internet and tried to download a SCG 237 schematic but couldn't find one on their website so what am I suppose to do? You stated,"Your response was way out of line. I can't offer help concerning this problem" but in the same response You offered up criticism to me! I Dare You as I worked in a Product Group that dealt with 256 Bit Encryption / Decryption used in the Commercial Land Mobile Radio Systems and that was only one of my positions while I was employed there. I want to know, What credentials can you offer up other than Criticism?

    Dan
    WA9WVX

  6. #6
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    I like the reply Dan
    I'm leaving now to go find myself....if I arrive before I get back, please ask me to wait!

  7. #7

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    Pulu never posted again. Maybe he wouldn't have anyway, but maybe he was so much blasted with negative, unhelpful comments that he is not active. Pulu might still be reading the forums, though. This kind of "better than you" talk is not what ham radio is about. Where were the moderators? And the blind standing by the trash talk is even worse. The forum isn't growing much - any wonder? Be nice and helpful, or stay quiet.

  8. #8

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    Quote Originally Posted by essbee View Post
    Pulu never posted again. Maybe he wouldn't have anyway, but maybe he was so much blasted with negative, unhelpful comments that he is not active. Pulu might still be reading the forums, though. This kind of "better than you" talk is not what ham radio is about. Where were the moderators? And the blind standing by the trash talk is even worse. The forum isn't growing much - any wonder? Be nice and helpful, or stay quiet.
    Mr. essBee,

    If I were in your shoes, without any electronic experience under your belt, I would sit by and read the comments posted on this Forum to learn how problems are really resolved. You must remember that I went to the SCG website to download the SCG-237 Schematic but it didn't exist! How would you think an individual could consult or advise, what components may have been damaged in Pulu's Automatic Antenna Tuner? Generally if a ham operator opens the factory Warranty unit, it Voids the Warranty automatically, the individual must have the proper Authorization from the Service Personnel before opening the unit and this doesn't matter if we're communicating about Commercial Land Mobile equipment or Amateur Radio equipment, it's the same Policy.

    Your inexperience talks volumes about yourself so go ahead and complain to the Moderators of the Ham Radio Forum to see if they will kick me off or bar me from advising other Amateur Radio Operators on legitimate problems that incur. Should the Moderators kick me off of this Forum for no legitimate reason, You'll win the conflict but in the long haul, You won't win the difference of opinion between You and I.

    I requested Your Credentials but all I hear is Criticism from YOU! How are YOU going to match my 49 years in Amateur Radio and my 35 years in professional career in Land Mobile Two-Way Radio for Motorola, Inc? Every day is a learning day in Electronics and Amateur Radio, there's no way around these issues and if you're smart You'll learn, take notes, continue to read about the subject, experiment but if You don't, You'll end up in your own little world not knowing a thing about this hobby.

    Dan
    WA9WVX

  9. #9

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    OK, Dan - it's not about you and your self-aggrandizing comments. It's about helping hams or people interested in ham radio, and meeting them on their level. If you didn't understand the original question, you shouldn't have replied since you only ran off yet another potential forum member with your demeaning words. You should remember that I gave you my credentials after you (improperly) asked. Although I am througlly experienced (contradictorily to your degrading comment), my license level and everyone else's is not revelant to the people trying to learn. Please help or just move on to a more complicated question that only you could answer. I don't like discord and I wish this had never come between us. If this continues, I will be gone from this forum just like the many before me.
    By the way, I happened to see the nasty comment made earlier today before it was deleted. Moderators on the job?

  10. #10

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    Mr. essBee,

    Why do YOU insist that you're right with your comments? I went back looking for anything related to Amateur Radio related to YOU but could NOT find a thing.

    YOU say that YOU want to learn, well pick up some ARRL Books and I will suggest the Handbook is a good place to start, perhaps that might be too hard for YOU to understand even though the league starts at Ground Zero on Basic Electronic Theory, then AC & DC circuits, how electronic circuits work, Antennas & Antenna Tuners, Homebrewing Test Equipment and how to use the measurements, How to set up a station, How to use Digital Modes and even Digital circuitry, Using Power Supplies, and a whole lot more. Apparently YOU thought Amateur Radio was just like operating a CB Radio but it's not and it's expensive to purchase and properly use. Most of today's radio equipment is Solid State, Microprocessor / Software driven so an individual must understand what they're dealing with.

    I get the feeling that YOU are a Plug & Play individual that doesn't have a clue how the equipment interfaces together and this learning curve is NOT gathered by Osmosis or a Crystal Ball, I can guarantee YOU that fact. I spent many hours looking at Schematics, tracing signal flow, basically doing troubleshooting for the new Amateur Radio Operators oppose to Charging the people $80.00 Per Hour for my Labor Time as Time Equals Money Spent. I'm very Sorry if I offended YOU and the other NEW hams but if and when YOU ever get up to my level, YOU may feel the same way about Stupid Questions or Criticism from a fellow Amateur Radio Operator. Go ahead run away from the truth and the Ham Radio Forum, I cannot stop YOU or anyone else, the answers may not fit YOUR thinking process but then again, What do YOU know?

    As for your Quote: "By the way, I happened to see the nasty comment made earlier today before it was deleted." I didn't see those comments. If YOU haven't determined that the "Moderators on the job?" Well, of course these Moderators are looking at the threads for any out of bound comments made and if they're really bad, they'll send a message directly to that individual using the Notification route.

    Here again YOU haven't proven that you're smart enough to locate the Moderators of the Ham Radio Forum but it is really easy by using the “Quick Links” then scroll down to “View Site Leaders” and Click your mouse on that. Most of the Moderators are over in the United Kingdom so figure that they're time is 4 to 7 hours different than in the United States or where ever your located.

    Good Luck on Your Decision!

    Dan
    WA9WVX

  11. #11

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    Dan, I agree with every point you made. You lack suave. While your message is 100% correct, you manner will keep the needy and challenged from hearing what you say.
    Old, thick skin folks like myself would not be bothered by it, but most newbies will take to the hills. I would figure you would make a good tech, and likely a good operator, but I figure elmer is a title folks would not pin on you.

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