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Re: Yaesu G-5500 issue
by aj9n 26 Jun '24

26 Jun '24

Hi Jeff,Have you looked at whether amps Q1003 and Q1004 are blown and maybe giving directly 6 or 12V (whatever it is supposed to be) to the meters? They might be shorted somehow to give full voltage all the time to the meters.What happens if you try to adjust the pots labeled VR0001 and VR0002? The meters should a change as you adjust them.Good luck,Charlie AJ9NSent from my T-Mobile 5G Device -------- Original message --------From: graham shirville via AMSAT-BB <amsat-bb(a)amsat.org> Date: 6/26/24 5:01 PM (GMT-05:00) To: 'jeff griffin' <kb2mjeff(a)att.net>, amsat-bb(a)amsat.org Subject: [AMSAT-BB] Re: Yaesu G-5500 issue Hi Jeff, Well I was assuming that it is the older 5500 model which has an AC motor - this has an instruction manual which shows a 6V regulator (top of circuit diagram).https://www.yaesu.com/downloadFile.cfm?FileID=8814&FileCatID=155&F… Maybe you have the 5500DC model for which they don’t seem to publish the circuit diagram? Although I doubt that they would have changed that part of the circuit 73Graham G3VZV From: jeff griffin via AMSAT-BB <amsat-bb(a)amsat.org> Sent: Wednesday, June 26, 2024 9:44 PMTo: amsat-bb(a)amsat.orgSubject: [AMSAT-BB] Re: Yaesu G-5500 issue Ok. I removed the LM7812 and put in a LM7806. I now have 6v between pin1 and pin3. I also still have full scale on the meters. I tried all the things that were suggested. including the OHM test between wire on pin1 and wire on pin3 500 ohms , and 250 or so between wop2 to wop3 and wop1. SO it looks like the rotor is ok, it still rotates in AZ and EL. I'm going to leave the 6v VR in as my cable runs are only about 30 feet. What to do next. I have two broken G-5500 control boxes here, the one I'm working on, and one with a bad transformer(it blows fuse when turned on). I also have half a working spare rotor, I forget if the AZ or EL is broke. If I send the box into Yaesu to fix, it will with the shipping probably be at least $200. I called Yaesu and they have new G-5500 control boxes for $380. I'm running out of stuff to try with this issue, and there isn't a lot of info to try and dig in any deeper. If I don't come up with anything I think I'm just going to buy a new control box, either the Yaesu or possibly another Green Heron FT-21azel. I'm going to give this another day, I'm hoping someone has had and fixed the same issue. Thanks for the continued help with this... 73 Jeff kb2m

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Re: Yaesu G-5500 issue
by mikflathead＠aol.com 26 Jun '24

26 Jun '24

Looking at the schematic for the 5500 there are 2 op amps that drive the meters. That would be my guess seeing how there is not much more than that. I believe someone else may have mentioned this. Could be a 2 dollar fix? On Wednesday, June 26, 2024 at 04:43:30 PM EDT, jeff griffin via AMSAT-BB <amsat-bb(a)amsat.org> wrote: Ok. I removed the LM7812 and put in a LM7806. I now have 6v between pin1 and pin3. I also still have full scale on the meters. I tried all the things that were suggested. including the OHM test between wire on pin1 and wire on pin3 500 ohms , and 250 or so between wop2 to wop3 and wop1. SO it looks like the rotor is ok, it still rotates in AZ and EL. I'm going to leave the 6v VR in as my cable runs are only about 30 feet. What to do next. I have two broken G-5500 control boxes here, the one I'm working on, and one with a bad transformer(it blows fuse when turned on). I also have half a working spare rotor, I forget if the AZ or EL is broke. If I send the box into Yaesu to fix, it will with the shipping probably be at least $200. I called Yaesu and they have new G-5500 control boxes for $380. I'm running out of stuff to try with this issue, and there isn't a lot of info to try and dig in any deeper. If I don't come up with anything I think I'm just going to buy a new control box, either the Yaesu or possibly another Green Heron FT-21azel. I'm going to give this another day, I'm hoping someone has had and fixed the same issue. Thanks for the continued help with this... 73 Jeff kb2m ----------------------------------------------------------- Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/ View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org

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Re: ANS-175 AMSAT News Service Weekly Bulletins
by Chris Thompson 26 Jun '24

26 Jun '24

I see that ELaNa 43 Launch Carrying MESAT-1 is now NET Jun 30th. On X Firefly say the window is the 30th to the 1st of July. This Maine University sat carries an AMSAT-NA transponder. The BPSK telemetry for their experiments and the health of the spacecraft will be decodable with FoxTelem. 73 Chris On Sat, Jun 22, 2024, 20:06 Paul Stoetzer via AMSAT-BB <amsat-bb(a)amsat.org> wrote: > > *AMSAT News Service* > *ANS-175* > *June 23, 2024* > > In this edition: > > - ELaNa 43 Launch Carrying MESAT-1 Scheduled for June 27, 2024 > - AMSAT Board of Directors Nominees Announced > - AMSAT Mail Alias Service to End August 1, 2024 > - Video of AMSAT Engineering Q&A Sessions Available > - Changes to AMSAT TLE Distribution for June 21, 2024 > - ARISS News > - Upcoming Satellite Operations > - AMSAT Ambassador Activities > - Satellite Shorts From All Over > > The AMSAT News Service bulletins are a free, weekly news and information > service of AMSAT, The Radio Amateur Satellite Corporation. ANS publishes > news related to Amateur Radio in Space including reports on the activities > of a worldwide group of Amateur Radio operators who share an active > interest in designing, building, launching and communicating through analog > and digital Amateur Radio satellites. > > The news feed on https://www.amsat.org publishes news of Amateur Radio in > Space as soon as our volunteers can post it. > > Please send any amateur satellite news or reports to: ans-editor [at] > amsat.org > > You can sign up for free e-mail delivery of the AMSAT News Service > Bulletins via the ANS List; to join this list see: > https://mailman.amsat.org/postorius/lists/ans.amsat.org/ > ------------------------------ > Save the Date! Symposium 2024 > > *Photo by Robert DuBois* > > Mark your calendar now for the 2024 AMSAT Symposium, > > *October 25-27, 2024 *at the Doubletree by Hilton Tampa Rocky Point > Waterfront in Tampa, Florida! > Watch for announcements concerning further details as plans are formulated. > ------------------------------ > ELaNa 43 Launch Carrying MESAT-1 Scheduled for June 27, 2024 > The University of Maine's MESAT-1 carrying a telemetry transmitter and > linear transponder provided by AMSAT and experiments designed by schools in > Maine will head into orbit as early as late this week as part of NASA's > ELaNa 43 launch. > > The ELaNa 43 (Educational Launch of Nanosatellites 43) mission includes > eight CubeSats flying on Firefly Aerospace’s Alpha rocket for its “Noise of > Summer” launch from Space Launch Complex-2 at Vandenberg Space Force Base, > California. The 30-minute launch window will open at 9 p.m. PDT Wednesday, > June 26 (12 a.m. EDT Thursday, June 27). > > Telemetry can be received using the same FoxTelem program that was used > for most of AMSAT's recent payloads. We urge readers to download the latest > FoxTelem (V1.12z3) from > https://www.amsat.org/tlm/leaderboard.php?id=0&db=FOXDB. This program > will decode telemetry from MESAT-1 (as well as AO-91) and forward the > results to AMSAT's central server for use by AMSAT engineering as well as > by Maine engineers and students. > > MESAT-1 will study local temperatures across city and rural areas to > determine phytoplankton concentration in bodies of water to help predict > algal blooms and also contains a linear transponder for amateurs to use. > Watch ANS and other media for information about when the transponder will > be activated. > > For more information on this satellite, visit > https://www.mainesat.org/mesat1/ > > *MESAT-1 – Launch June 27, 2024* > Uplink LSB 145.910 MHz through 145.940 MHz > Downlink USB 435.810 MHz through 435.840 MHz > AMSAT LTM-1 Transponder – 1200 bps FoxTelem BPSK beacon 435.800 MHz > > *[ANS thanks NASA and AMSAT Engineering for the above information]* > ------------------------------ > AMSAT Board of Directors Nominees Announced > > The nomination period for the 2024 AMSAT Board of Directors Election ended > on June 15th. The following candidates have been duly nominated: > > - Mark Hammond, N8MH > - Frank Karnauskas, N1UW > - Bruce Paige, KK5DO > - Paul Stoetzer, N8HM > - Douglas Tabor, N6UA > > As three seats on the Board of Directors are up for election this year, > the three candidates receiving the largest number of votes shall be > declared elected to the seats. The two candidates receiving the next > largest number of votes shall be declared First Alternate and Second > Alternate, respectively. The voting process will be conducted via AMSAT's > Wild Apricot membership system and will commence on July 15th. Instructions > for voting will be emailed to all members in good standing as of July 1st > by July 15th. The voting period shall conclude on September 15th and > results will be announced not later than September 30th. > > Biographies of the candidates will be available for review online and > published in the next edition of *The AMSAT Journal*. > > *[ANS thanks Jeff Davis, KE9V, AMSAT Secretary, for the above information]* > ------------------------------ > AMSAT Mail Alias Service to End August 1, 2024 > > A long-standing member service, the AMSAT Mail Alias Service is scheduled > to end on August 1, 2024. A mail alias on AMSAT.ORG permitted people to > send an email to members without knowing their actual internet email > address. They just needed to know their amateur radio callsign. > > Unfortunately, the unchecked rise in domain name hacking and email account > high-jacking has made it impossible to sustain this service at a > cost-effective level. The number of callsign(a)amsat.org email accounts > that had been hijacked and converted to zombie spam accounts over the years > had led many internet service providers and gateway centers to ban all @ > amsat.org email addresses, including those business accounts of AMSAT > officers and officials. The tireless efforts of AMSAT’s all volunteer IT > staff has worked for years to repair much of the damage, but AMSAT still > get complaints from members who are not getting their personal emails, ANS > bulletins or AMSAT-BB posts because of persistent delivery problems. > > It has come to the point where the AMSAT volunteer IT staff can no longer > keep up with the maintenance requirements to keep the alias mail list clean > and to work with email gateways to remove blocks. And, after considerable > investigation into alternative paid email services, AMSAT leadership > decided that the money required to keep an email alias system alive would > be better spent on building and flying satellites for its members. > > Persons using the Mail Alias Service should begin to migrate to different > email accounts so they do not lose receipt of personal emails, AMSAT News > Service Weekly Bulletins, AMSAT-BB posts, or official messages from AMSAT > itself. Members are especially asked to make sure they are NOT using a > callsign(a)amsat.org as their registered email address in the AMSAT > membership portal. Members can easily change their registered member email > address by logging into the portal and updating their profile. > > *[ANS thanks AMSAT for the above information]* > ------------------------------ > Video of AMSAT Engineering Q&A Sessions Available > > AMSAT Vice President – Engineering, Jerry Buxton, NØJY, hosted Q&A > “social gathering” live streams on YouTube and Twitch, as he mentioned in > his Hamvention “They Cancelled All My Flights” video where he followed up > and answered questions on developments with GOLF, Fox Plus, and other > projects. > > Archived videos of these sessions can be found at > https://www.youtube.com/@n0jy/streams > > *Note: If you read this at the time of publication, the final session may > be ongoing as it is scheduled to run from 00:01 UTC to 02:00 UTC on Sunday, > June 23rd.* > > *[ANS thanks Jerry Buxton, N0JY, AMSAT Vice President - Engineering, for > the above information]* > ------------------------------ > > > *The 2024 Coins Are Here Now!Help Support GOLF and Fox Plus.**Join > <https://www.amsat.org/join-the-amsat-presidents-club/> the AMSAT > President’s Club today!* > > ------------------------------ > Changes to AMSAT TLE Distribution for June 21, 2024 > > Two Line Elements or TLEs, often referred to as Keplerian elements or keps > in the amateur community, are the inputs to the SGP4 standard mathematical > model of spacecraft orbits used by most amateur tracking programs. Weekly > updates are completely adequate for most amateur satellites. TLE bulletin > files are updated Thursday evenings around 2300 UTC, or more frequently if > new high interest satellites are launched. More information may be found at > https://www.amsat.org/keplerian-elements-resources/ > > This week there are no additions or deletions to the AMSAT TLE > distribution. > > *[ANS thanks Joe Fitzgerald, KM1P, AMSAT Orbital Elements Manager, for the > above information]* > ------------------------------ > > *Need new satellite antennas? Purchase an M2 LEO-Pack from the **AMSAT > Store! <https://amsat.org/product-category/hardware/>**When you purchase > through **AMSAT, a portion of the proceeds goes towards **Keeping Amateur > Radio in Space.* > > ------------------------------ > ARISS News > > Amateurs and others around the world may listen in on contacts between > amateurs operating in schools and allowing students to interact with > astronauts and cosmonauts aboard the International Space Station. The > downlink frequency on which to listen is 145.800 MHz worldwide. > > *Complejo Educativo Nuestra Señora de Fátima N° 1139 and N° 8119, Pérez, > Argentina, Telebridge via VK6MJ* > > The ISS callsign is presently scheduled to be NA1SS > The scheduled crewmember is Jeanette Epps KF5QNU > The ARISS mentor is VE6JBJ > Contact is go for: Thu 2024-06-27 13:38:07 UTC 56 deg > > As always, if there is an EVA, a docking, or an undocking; the ARISS > radios are turned off as part of the safety protocol. > > The crossband repeater continues to be active (145.990 MHz up {PL 67} & > 437.800 MHz down), If any crewmember is so inclined, all they have to do > is pick up the microphone, raise the volume up, and talk on the crossband > repeater. So give a listen, you just never know. > > Note, all times are approximate. It is recommended that you do your own > orbital prediction or start listening about 10 minutes before the listed > time. > > The latest information on the operation mode can be found at > https://www.ariss.org/current-status-of-iss-stations.html > > The latest list of frequencies in use can be found at > https://www.ariss.org/contact-the-iss.html > > *[ANS thanks Charlie Sufana, AJ9N, one of the ARISS operation team mentors > for the above information]* > ------------------------------ > Upcoming Satellite OperationsQuick Hits: > > From Randy,* ND0C*: > > From 24 June thru 7 July, we will be on another family camping vacation, > which means another satellite roving expedition! This time, thru *WI to > MI and back thru IL and IA.* No super rare grids but several that may be > needed by many. The grids and passes will depend on where/when we happen to > be while on the road or camping. This will be all LEO sats: FM & SSB. As > always, I will try for EU passes on RS-44 when possible. Looking forward to > pushing past the 100 grids-roved milestone. More info to come. > > ******************************************************************** > > *JA2QJI/8* will be QRV on GreenCube/IO-117 from *QN05* on 25th June. See > hams.at for any additional details. > > ******************************************************************** > > From Mike, *N8MR*: > > I will be in *EN57*, with roves to *EN67* from Friday, June 28 thru > Saturday, July 6. Using an Icom 9700, Arrow and Alaskan antennas. Listening > for Europe on linear eastern passes. *I can rove to EN56, only if needed.* Posting > passes to hams.at a day in advance. All QSOs to LoTW as N8MR. > > ******************************************************************** > > *HB0/DK9JC* should be QRV from *JN47* on GreenCube/IO-117 on 26th June. > See hams.at for any updates. > Major Roves: > *VP5/AA5UK* will be QRV from *FL31* from 23rd June through 5th July. This > operation will be holiday style but will cover HF/LEO/MEO. Head over to his > VP5/AA5UK QRZ page for all the info you can shake a stick at. > > *[ANS thanks Ian Parsons, K5ZM, AMSAT Rover Page Manager, and Alex Ners, > K6VHF, for the above information]* > ------------------------------ > * Want to fly the colors on your own grid expedition?* > Get an AMSAT car flag and other neat stuff from our Zazzle store > <https://www.zazzle.com/store/amsat_gear>! > 25% of the purchase price of each product goes towards Keeping Amateur > Radio in Space > > ------------------------------ > AMSAT Ambassador Activities > > AMSAT Ambassadors provide presentations, demonstrate communicating through > amateur satellites, and host information tables at club meetings, hamfests, > conventions, maker faires, and other events. > > AMSAT Ambassador Clint Bradford, K6LCS, says, > > "Think a 75-minute presentation on "working the easy satellites" would be > appropriate for your club or event? Let me know by emailing me at > k6lcsclint (at) gmail (dot) com or calling me at 909-999-SATS (7287)!" > > Clint has NEVER given the exact same show twice: EACH of the 150+ > presentations so far has been customized/tailored to their audiences. > Scheduled Events > > *“Moon Day” Frontiers of Flight Museum* > > *July 20, 2024* > Love Field in Dallas, Texas > AMSAT volunteers needed! Contact tschuessler(at) amsat.org for more > information. > > > *Huntsville Hamfest**August 17-18, 2024* > > Huntsville, AL > AMSAT Booth and Forum > N8DEU and W4FCL > > > *Northeast HamXpostion**August 22-25, 2024* > > Best Western Royal Plaza Hotel & Trade Center > 181 Boston Post Road W > Marlborough, MA 01752 > > > *Greater Louisville Hamfest**September 7, 2024* > > Shepherdsville, KY > AMSAT Forum and Information Table > W4FCL > > > *Central Kentucky Hamfest**October 5, 2024* > > Lexington, KY > AMSAT and Educational Satellites Forum and Information Table > AI4SR and W4FCL > > > *North Star Radio Convention**October 5, 2024* > > Hennepin Technical College (North Campus) > Brooklyn Park, Minn. > AMSAT Forum and Information Table > KØJM and ADØHJ > > > *2024 AMSAT Space Symposium and Annual General Meeting**October 25-27, > 2024* > > Doubletree by Hilton Tampa Rocky Point Waterfront > 3050 N Rocky Point Dr W > Tampa, FL 33607 > > *[ANS thanks Clint Bradford, K6LCS, and AMSAT for the above information]* > ------------------------------ > Satellite Shorts from All Over > > + If you participated in AMSAT Field Day, remember to submit your summary > sheet and any photos or comments by July 23, 2024. Submission details can > be found at https://www.amsat.org/field-day/ > ------------------------------ > > Join AMSAT today at https://launch.amsat.org/ > > In addition to regular membership, AMSAT offers membership to: > > - Societies (a recognized group, clubs or organization). > - Primary and secondary school students are eligible for membership at > one-half the standard yearly rate. > - Post-secondary school students enrolled in at least half time status > shall be eligible for the student rate for a maximum of 6 post-secondary > years in this status. > - Memberships are available for annual and lifetime terms. > > Contact info [at] amsat.org for additional membership information. > > *73 and remember to help Keep Amateur Radio in Space!* > > *This week's ANS Editor,* > > *Paul Stoetzer, N8HM* > *n8hm [at] amsat.org <http://amsat.org>* > > *ANS is a service of AMSAT, the Radio Amateur Satellite Corporation, 712 H > Street NE, Suite 1653, Washington, DC 20002* > > ----------------------------------------------------------- > > Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available > to all interested persons worldwide without requiring membership. Opinions > expressed > are solely those of the author, and do not reflect the official views of > AMSAT-NA. > Acceptable Use and Privacy Policies available at > https://www.amsat.org/about-amsat/ > > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/[email protected] > To unsubscribe send an email to amsat-bb-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org

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Re: Yaesu G-5500 issue
by graham＠shirville.com 26 Jun '24

26 Jun '24

Hi Jeff, Well I was assuming that it is the older 5500 model which has an AC motor - this has an instruction manual which shows a 6V regulator (top of circuit diagram). https://www.yaesu.com/downloadFile.cfm?FileID=8814 <https://www.yaesu.com/downloadFile.cfm?FileID=8814&FileCatID=155&FileName=G…> &FileCatID=155&FileName=G-5500_IM_ENG_E12901004.pdf&FileContentType=application%2Fpdf Maybe you have the 5500DC model for which they don’t seem to publish the circuit diagram? Although I doubt that they would have changed that part of the circuit 73 Graham G3VZV From: jeff griffin via AMSAT-BB <amsat-bb(a)amsat.org> Sent: Wednesday, June 26, 2024 9:44 PM To: amsat-bb(a)amsat.org Subject: [AMSAT-BB] Re: Yaesu G-5500 issue Ok. I removed the LM7812 and put in a LM7806. I now have 6v between pin1 and pin3. I also still have full scale on the meters. I tried all the things that were suggested. including the OHM test between wire on pin1 and wire on pin3 500 ohms , and 250 or so between wop2 to wop3 and wop1. SO it looks like the rotor is ok, it still rotates in AZ and EL. I'm going to leave the 6v VR in as my cable runs are only about 30 feet. What to do next. I have two broken G-5500 control boxes here, the one I'm working on, and one with a bad transformer(it blows fuse when turned on). I also have half a working spare rotor, I forget if the AZ or EL is broke. If I send the box into Yaesu to fix, it will with the shipping probably be at least $200. I called Yaesu and they have new G-5500 control boxes for $380. I'm running out of stuff to try with this issue, and there isn't a lot of info to try and dig in any deeper. If I don't come up with anything I think I'm just going to buy a new control box, either the Yaesu or possibly another Green Heron FT-21azel. I'm going to give this another day, I'm hoping someone has had and fixed the same issue. Thanks for the continued help with this... 73 Jeff kb2m

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Re: Yaesu G-5500 issue
by jeff griffin 26 Jun '24

26 Jun '24

Ok. I removed the LM7812 and put in a LM7806. I now have 6v between pin1 and pin3. I also still have full scale on the meters. I tried all the things that were suggested. including the OHM test between wire on pin1 and wire on pin3 500 ohms , and 250 or so between wop2 to wop3 and wop1. SO it looks like the rotor is ok, it still rotates in AZ and EL. I'm going to leave the 6v VR in as my cable runs are only about 30 feet. What to do next. I have two broken G-5500 control boxes here, the one I'm working on, and one with a bad transformer(it blows fuse when turned on). I also have half a working spare rotor, I forget if the AZ or EL is broke. If I send the box into Yaesu to fix, it will with the shipping probably be at least $200. I called Yaesu and they have new G-5500 control boxes for $380. I'm running out of stuff to try with this issue, and there isn't a lot of info to try and dig in any deeper. If I don't come up with anything I think I'm just going to buy a new control box, either the Yaesu or possibly another Green Heron FT-21azel. I'm going to give this another day, I'm hoping someone has had and fixed the same issue. Thanks for the continued help with this... 73 Jeff kb2m

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Re: Yaesu G-5500 issue
by mikflathead＠aol.com 26 Jun '24

26 Jun '24

I would guess that they supplied extra voltage for setups with long cable runs to make sure you could get full scale. Then the adjust it down with the pots. On Wednesday, June 26, 2024 at 12:06:42 PM EDT, graham shirville via AMSAT-BB <amsat-bb(a)amsat.org> wrote: Uuum …I thought the regulators are ?6V ones? 73 Graham G3VZV From: jeff griffin via AMSAT-BB <amsat-bb(a)amsat.org> Sent: Wednesday, June 26, 2024 4:57 PM To: amsat-bb(a)amsat.org Subject: [AMSAT-BB] Re: Yaesu G-5500 issue Ok here's what I got so far. First thing is the failed voltage regulator is/was a LM7812C, a 12v regulator. So I replaced it with the same. Now when I turn on the control box I get a 12v reading between 1 and 3, and now both meters are pinned full scale. So I hooked up the elevation side and the rotor is of course still working but the meters stay pinned full scale. I tried to adjust the full scale and out voltage Adj on the back and they have no effect on the meter reading. Anyone have any ideas? Thanks everyone for all the good input so far, we're getting there... 73 Jeff kb2m ----------------------------------------------------------- Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/ View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/[email protected] To unsubscribe send an email to amsat-bb-leave(a)amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org

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Re: Yaesu G-5500 issue
by jeff griffin 26 Jun '24

26 Jun '24

Here's a picture of the LM7812c that I removed. It sure looks like a 12v VC to me. I am now confused..... 73 Jeff kb2m

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Re: Yaesu G-5500 issue
by Burns Fisher 26 Jun '24

26 Jun '24

I have power wires to a preamp running through a PVC conduit and have had mice get in and chew them through. So that is one guess--mice on the potentiometer power. Another possibility is that there was a nearby lightning strike over the winter and it opened up your surge protector. Or if you don't have one, maybe that blew the S.A.T. 73, Burns WB1FJ On Sun, Jun 23, 2024 at 11:33 AM mikflathead--- via AMSAT-BB < amsat-bb(a)amsat.org> wrote: > Do you have any angry squirrels? > > On Sunday, June 23, 2024 at 10:51:42 AM EDT, Jim McCullers via AMSAT-BB < > amsat-bb(a)amsat.org> wrote: > > > Jeff, > > > > Remove the wires connected to terminal positions 1, 2, and three on both > the Al and Ez connectors on the back of the G-5500. > > Make certain you label them or take a photo for reinstallation. > > > > With the G-5500 powered on, measure from terminal 1 to terminal 3 on each > connector using volt meter. > > You should read 6 volts +/- a fraction. > > Both Al and Ez are powered by the same circuit. If there is no reading or > the reading is way off, then the voltage regulator in the G-5500 has failed. > > > > If the voltage appears correct, using an ohm meter on a low scale measure > between the wires that were connected to terminals 1 and 3 on both > connectors. > > You should read about 500 ohms or so. > > Then measure between the wire that connected to terminal 2 on each > connector to the terminal 1 wire then the terminal 3 wire. > > The sum of the two should be in the range of the value you read between > wires 1 and 3. > > If you read a short (low ohms) or infinity that indicates damage to the > cable from the rotor to the controller. > > Recheck all connections. > > > > It’s difficult to believe both Az and El pots would fail at the same time > so I would lean to either cable damage or a bad regulator on the G-5500 > board. > > > > Good luck and please post your results. > > > > Jim McCullers > > WA4CWI > > ----------------------------------------------------------- > > Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available > to all interested persons worldwide without requiring membership. Opinions > expressed > are solely those of the author, and do not reflect the official views of > AMSAT-NA. > Acceptable Use and Privacy Policies available at > https://www.amsat.org/about-amsat/ > > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/[email protected] > To unsubscribe send an email to amsat-bb-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org > > ----------------------------------------------------------- > > Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available > to all interested persons worldwide without requiring membership. Opinions > expressed > are solely those of the author, and do not reflect the official views of > AMSAT-NA. > Acceptable Use and Privacy Policies available at > https://www.amsat.org/about-amsat/ > > View archives of this mailing list at > https://mailman.amsat.org/hyperkitty/list/[email protected] > To unsubscribe send an email to amsat-bb-leave(a)amsat.org > Manage all of your AMSAT-NA mailing list preferences at > https://mailman.amsat.org

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Re: Yaesu G-5500 issue
by Joe Fitzgerald 26 Jun '24

26 Jun '24

Jeff, I am suspicious that when that regulator failed, it damaged the op-amps that drive the meters. Consider probing around from the rotor connections through that meter drive circuitry to see where the signal levels stop making sense. Fortunately it looks like replacement op amps are cheap, I saw what look like viable replacements at Digi-Key for $0.54. de KM1P Joe

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Re: Yaesu G-5500 issue
by graham＠shirville.com 26 Jun '24

26 Jun '24

Uuum …I thought the regulators are ?6V ones? 73 Graham G3VZV From: jeff griffin via AMSAT-BB <amsat-bb(a)amsat.org> Sent: Wednesday, June 26, 2024 4:57 PM To: amsat-bb(a)amsat.org Subject: [AMSAT-BB] Re: Yaesu G-5500 issue Ok here's what I got so far. First thing is the failed voltage regulator is/was a LM7812C, a 12v regulator. So I replaced it with the same. Now when I turn on the control box I get a 12v reading between 1 and 3, and now both meters are pinned full scale. So I hooked up the elevation side and the rotor is of course still working but the meters stay pinned full scale. I tried to adjust the full scale and out voltage Adj on the back and they have no effect on the meter reading. Anyone have any ideas? Thanks everyone for all the good input so far, we're getting there... 73 Jeff kb2m

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