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I use my FT-980 mainly as a receiver. I have INRAD Xtal 455kHz filters. So I decided long ago to remove the 24V fuse. I heard alarms about PA destroyed by 24PS failure destroying PA transistors by overvoltage. But I have never seen a real failure. So I dont know how needed is to install a 24 crowbar. It is simple and easy to connect it at the 24V fuse output. But I have never heard in "serious" forum about the need for the crowbar, o even about overvoltage problems. Has anybody any notice about it? Or installed a crowbar? 73 EA1FC

Hi all. How do I connect my Q5signal transverter to my FT-980? Also what is the best methode for connecting my sdrplay to my FT-980? 73 de Bent LA0GE

I was given a nice looking 980 apart with a broken attenuator shaft. I fixed that, and cleaned/lube all controls. It did not want to go to Ham fr Gen coverage and I tracked to and replaced a 40 pin IC (socketed) in the PLL . This rig works great, and I have a MD1 for it and hand mic. I really would rather sell it to someone here-before I go to Ebay..I have video of it and get great reports. Send me email and an REAL offer above $300...Randy K5SL

My 980 just failed and I am looking for help: The good: I have display & transmit on all bands The bad: I can only receive well in FM mode. SSB and AM are nearly dead. I can hear very strong SSB signals faintly with AF turned all the way up. The radio may have been exposed to a very strong 160m transmitter signal while an antenna was mistakenly attached to it, but I am not 100 percent certain of this.. If I took out an RF amp transistor, why does it still work on FM? Both the Gen and Ham receiver modes act the same... pretty much dead. Any insight would be greatly appreciated. I have limited test equipment. I love this radio! Ed

I am fascinated to find a thread in this FT-980 group to discuss CAT connection to FT-980 using Hamlib library. I am now trying to do it myself. However, when I try to use rigctl in the Hamlib library, it times out. Since I could connect to and get information from my FT-980S using a simple program that I wrote, I think hardware connection is OK. My question is: (1) Could any of you connect using rigctl to FT-980? (2) If yes, what options did you use? I used: rigctl -m 1031 -r /dev/tty.usbserial-10 -vvvvv but it times out. I include the log below. What am I doing wrong? I am using Hamlib 4.5.2 installed via homebrew on M1 mac (Big Sur). Any help/information is appreciated! Thank you in advance. -- Kenichi Asai $ rigctl -m 1031 -r /dev/tty.usbserial-10 -vvvvv rigctl.c(445) Startup: rigctl -m 1031 -r /dev/tty.usbserial-10 -vvvvv rigctl Hamlib 4.5.2 Fri Dec 23 23:04:12 2022 +0000 SHA=f12ac6 Report bugs to <hamlib-developer@...> rig_check_rig_caps: p1=0x100f02d20, p2=0x100f092a0, rig_model=0x100f02d20, macro_name=0x100f092a0 yaesu: initrigs4_yaesu called rig_init: rig_model=Yaesu FT-980 rig_init: backend for FT-980 does not contain hamlib_check_rig_caps rig_init: rig has VFO_SUB rig_init: rig has VFO_MAIN rig_init: rig has VFO_MEM ft980_init called 1:rig.c(812):rig_open entered rig_settings_get_path: path=/Users/asai/.config/hamlib_settings rig_settings_load_all: settings_file (/Users/asai/.config/hamlib_settings): No such file or directory rig_open: cwd=/Users/asai rig_open: /Users/asai/hamlib_settings does not exist rig_open: async_data_enable=0, async_data_supported=0 serial_open: /dev/tty.usbserial-10 ser_set_rts: RTS=0 ser_set_dtr: DTR=0 serial_setup: tcgetattr serial_setup: cfmakeraw serial_setup: cfsetispeed=4800,0x12c0 serial_setup: cfsetospeed=4800,0x12c0 serial_setup: data_bits=8 serial_setup: parity=0 serial_setup: Handshake=None serial_setup: tcsetattr TCSANOW read_string_generic called, rxmax=4095 direct=1, expected_len=1 ser_set_rts: RTS=0 2:rig.c(7417):async_data_handler_start entered async_data_handler_start: async data support disabled since async_data_enabled=0 2:rig.c(7424):async_data_handler_start returning(0) rig.c(254):add_opened_rig returning2(0) rig_open: 0x13600ce1c rs->comm_state==1?=1 ft980_open called write_block(): TX 5 bytes, method=1 0000 00 00 00 00 00 ..... read_block_generic called, direct=1 read_block_generic(): Timed out 2.5024 seconds after 0 chars, direct=1 write_block(): TX 5 bytes, method=1 0000 00 00 00 00 00 ..... read_block_generic called, direct=1 read_block_generic(): Timed out 2.5034 seconds after 0 chars, direct=1 write_block(): TX 5 bytes, method=1 0000 00 00 00 00 0b ..... read_block_generic called, direct=1 read_block_generic(): Timed out 2.5054 seconds after 0 chars, direct=1 write_block(): TX 5 bytes, method=1 0000 00 00 00 00 00 ..... read_block_generic called, direct=1 read_block_generic(): Timed out 2.5005 seconds after 0 chars, direct=1 write_block(): TX 5 bytes, method=1 0000 00 00 00 00 00 ..... read_block_generic called, direct=1 read_block_generic(): Timed out 2.5036 seconds after 0 chars, direct=1 write_block(): TX 5 bytes, method=1 0000 00 00 00 00 0b ..... read_block_generic called, direct=1 read_block_generic(): Timed out 2.4996 seconds after 0 chars, direct=1 rig.c(1275) trace 2:rig.c(2879):rig_get_vfo entered rig_get_vfo: cache check age=1000000ms rig_get_vfo: cache miss age=1000000ms rig.c(2921) trace ft980_get_vfo called ft980_get_status_data called rig_check_cache_timeout called rig_check_cache_timeout: forced cache timeout ft980_transaction called rig_flush: called for serial device read_string_generic called, rxmax=4095 direct=1, expected_len=1 write_block(): TX 5 bytes, method=1 0000 00 00 00 00 01 ..... read_block_generic called, direct=1 read_block_generic(): Timed out 2.5003 seconds after 0 chars, direct=1 rig_get_vfo: returning -5(read_block_generic called, direct=1 read_block_generic(): Timed out 2.4996 seconds after 0 chars, direct=1 rig.c(1275) trace 2:rig.c(2879):rig_get_vfo entered rig_get_vfo: cache check age=1000000ms rig_get_vfo: cache miss a

Hope you all had a pleasant Christmas holiday I've finished re-furbishing the PA unit following previous owners terrible mess. Two questions please: (i) The final amplifier bias is adjusted by turning VR8001. Page 30 (Technical Supplement) asks for setting the "High Current" line to the PA to 200mA. There are three lines feeding the board ( a fourth is ground) - Two 13.8V and one 24V. Does anyone know which is the "high current" line please for this measurement? (ii) PO meter calibration. This is adjusted by turning "VR 11 Main Chassis" (after setting "drive" to give 100Watt output on an external meter) until 100W is read on Meter 1. Does anyone know where this pot. is situated please? Thanks in advance for any help Peter G0LQU

Hello I need to remove the power supply and power amp units from the back of the radio. I have the user intructions and the technical supplement but they do not cover this area. Is there any more documentation available please? Thank you Peter G0LQU

Hi all. I have a very early FT980 (in fact I have two - one with an Rx fault with LSB and one with a Tx fault - intermittent RF power out). For the Tx problem rig, when I Tx using FSK mode with 50 Ohm dummy load and advance the drive control - SOMETIMES - meter 1 can go full-scale (normal) and my power meter shows a steady 80 Watts Rf out. (a bit low). OTHERTIMES there is no movement on meter 1 even with Drive control fully clockwise and no Rf out on my external power meter. I noticed with the drive control fully clockwise on Tx, quite a loud hum from the area of the PA/Power supply which I have proved is 100Hz. This sounds like too much ripple from the two smoothing capacitors (18000uF 50VW, which i will try to change) but I wonder if this is the cause in the intermittent problem or whether this is something else? (e.g. the tantalum capacitors mentioned by EA1FC? Thanks for any comments Peter G0LQU

I've gone through "Alpha" testing of the opensource hamlib interface library code (v4.0). The ft-980 code (ft-980.c) is listed at "Alpha", or untested. The Alpha code only has 6 functions listed: get_frequ, set freq, get_mem {number}, set_mem {number}, get_mode, set_mode. I found only one error: the set_mem error has a bug in a line that limits the ability to set the active memory number from 1 - 15, not 1-16. I found the bug in the 'C' code. My next step is to report this to the developers ... although I plan to set up a toolchain and finish the development myself. If anyone is interested, let me know: I'll set up a Dropbox with my documentation and progress. -- -Mat Breton, N8TW

Has anyone in the group ever had a problem with the detector diodes in the Fwd/Ref Power circuit (CM Coupler) failing? Seems that the SWR functions on two of my '980s are inoperative, though the Fwd Set (and both meters themselves) work fine. Only things I can think of which would cause a failure is high near-field energy caused by multi-transceiver operation, or nearby lightning strike. Regardless, I have some 1SS97s inbound. Other causes of the malfunction? 73 - Fred, N8YX

My FT-980 is series 04. So I guess all service notes needed in early versions were done. After fixing the PA, next day I found that LSB reception was... strange, like added AC, tremolo when listening CW in LSB mode... in short very bad. All other modes were OK as much as I remember. After some 10 minutes LSB reception was normal, and I made a one hour QSO with very good reports on my modulation, I received all OMs with no problems. But the problem is there. Only in LSB and only the first 10 minutes. I read about and thought about TC01 in PLL unit. A well known candidate. So I checked as per service instructions. USB, Witdh CCW, and no voltage at all. Whatever I do cero voltage in TP. The radio was receiving OK in USB, but still horrible sound in LSB. I was sure I was doing something wrong, and check and check and changed meters, they show 0,00V. Until it got warm. And LSB sound became normal. Not a believer, I rechecked voltage in TP, and I had voltage, but out of range. USB and WIDTH CCW about 3V. LSB and WIDTH CW 1.5V. Exactly half what the manual says (6V-3V/4V)I hope my meter is OK. That is why I opened a new thread, works after 10 minutes and voltage ratio USB/LSB 2:1 is almost exact. Just it does not exist in cold and when appears is half the normal value. As I told in the PA problem thread this radio has been sleeping for more than 25 years. And as today I have not realigned anything. So I guess I should do something with my limited means. BTW I hope the large metal cover of PLL/VCO units lifts just pulling. I dont have good test equipment, but I have a frequency meter, good ceramic trimming screwdrivers, and a RF probe I have never used. And null experience in PLL or similar. Neither the user manual nor the service, explains the signal path or function. In my old FT-101ZD the operation manual described with detail how the radio worked. Well, if I wait 10 minutes before I use it in LSB it is a nice radio. But I would like to understand what is happening. 73 EA1FC

Super topic. I think the PS is not well designed. Specially too much voltage in AC area. So I will try other approach. To reduce the heat, because the PS is always hot, and worse cooled than the PA that runs reasonably cool A silly calculation tells me that 200V should be enought with primary at 234 (I guess that less that 190 will be the figure). So I am going to try. Above all because the biggest risk ist failure of PS letting full voltage to PA, that wold be destroyed inmediately. So after 40 years... I will try. 73 EA1FC

radio_ozu <javier_ebay@...> added the album radio_ozu: Some photos from the text discused. Most with explanations

Hello to all on the list. The 980 only requires 2 1.5V AA batteries. But anything that produces 3 V will work OK, Anything above that is OK. Been a 980 user since 1983. I was told by Chip K7JA to not use 9V types. The receiver in the 980 is the basis for those in most later Yaesu gear. 73 Dave K4JRB -----Original Message----- From: <[email protected]> Sent: Jan 4, 2022 1:46 PM To: <[email protected]> Subject: Re: [Yaesu-FT-980] 4.5v for battery backup? Hi Fred and Matt, I am the owner of an FT-980 and the author of this modification. The backup battery is now a CR2032 ! I introduce myself, I am a radio amateur since 1990, RF engineer and I build my own transceivers. My FT-890 was given to me as a wreck (SN : 3C 010193), since then I take care of it and I made many small modifications. F5SSL told me about this forum, I directly joined !. I invite you to have a look on https://www.mods.dk/ to find all my articles. 73 Jean-Matthieu (call me JMat) F5RCT QTH Strasbourg North (East of France)

Involved with the PA, I see it is very difficult to access/repair. And maybe expensive if transistors are damaged by overvoltage. The Manual tells you to keep an eye on the 24V because overvoltage would destroy finals and drivers. I allways used the radio as receiver and removed the 24V fuse. I wonder wether I ever transmitted with it. The PS is quite good in regulation, Q01 is a courrent source and it is somehow limited in A. But if regulator transistor Q1 shortens the PA can get 42V and get destroyed inmediately. The crowbar shortens to ground the 24V in case of overvoltage. There are many examples of it. It needs a SCR, one or two zeners (one 24V to trigger and another maybe 3V or 2 silicon diodes) to protect the SCR base, two resistors, and a good fuse. In case of overvoltage the 24V zener lets voltage to SCR gate that shortens positive 24 line to ground. To avoid damage of SCR gate it must be protected from overvoltage to ground, with another zener or a couple of diodes (1.2V) enought as triggering occurs maybe with 0.7V There are two posibility. 1.- Easy one. The crowbar in PS output. Easy access to 24V, use of radio 24V fuse. Problem when crowbar acts, Q1 upwards in PS may get destroyed before the fuse blow 2,. More elaborate. The crowbar SCR anode connected to the input of Q1 and the zener to Q1 output. In this case the SCR shortens the capacitor C01+C02, so it needs a real BIG capacity of intensity, but protects the PS and the PA. Main radio fuse probably will blow. Maybe it is possible to fit a fast fuse between main capacitor (36000uF) and crowbar/Q1 All this because I think a damage in PS can be repair by an average OM, but change of drivers and finals, besides expensive, needs some tools and qualifications 73 EA1FC

A VE7 reported I was slightly over driving my amp with my 980 on 2 SSB. I have always set my drive to between 90 and 100 watts and used the compressor set to 1 o'clock. It sounds fine in the monitor. I turned down the power to 60 watts then turned off the processor and used the mic gain, He told my no matter what I was over driving. I use a nice Heil Boom Mic set with HC4 element and never had any over drive reports. I had several USA contacts and 2 European calls and all said I sounded fine with great audio. I don't want to get a pink slip report from the new ARRL volunteers on this. 73 Dave K4JRB A FT-980 user since 1983

Not sure if everyone looks at Sherwood Engineering's receiver performance specifications, but the FT-980 was measured many years ago. It is interesting to contrast it with new rigs. http://www.sherweng.com/table.html If you so inclined, please read the "Terms Explained" link on the page: It is actually also a description of issues, test procedures, and some historical data ... a good read. My thoughts from the table: 1. In terms of receiver sensitivity, the FT-980 still holds up as an excellent receiver (right up there with the FTdx-101D and Elekraft K3). 2. It is also excellent wrt receiver noise floor, actually beating the FlexRadio 6700. 3. Where performance starts to fall off is fliter leakage ("Ultimate Filter") as the modern direct-sampling DSPs seem to generally outperform the older analog filtering. 4. Likewise, the 3rd-order wide and narrow dynamic blocking range falls behind many of the modern rigs (although this is true of most of the rigs in this and previous generations). -- -Mat Breton, N8TW

Hi Gang, I am repairing an FT-980 for a friend of mine. His radio has a relatively high serial number: 3D 010641 I see a multitude of problems with this radio and I wanted to eliminate some "customization" done by the previous owner(s). I see a strange relay nicely tucked at the back of the ACC-1 connector. None of my radios, with lower SN, has such relay. Please see attached photo. The relay is marked by a dotted line box. Could someone confirm if this is a factory mod or should I dig around it? Thank for reading this and 73,Wald N4PL