|
Hello to the group, Just took delivery of an 847. Great radio. I'm just in the process of getting everything hooked up, CAT, digital modes etc. I plugged my signal lines into the DATA in/out jack and for some reason the radio goes into TX mode. Have to look into that. Question # 1: Can I use the PACKET jack for digital modes such as FT8 or AFSK RTTY? Or is it strictly for packet operation? I'm trying to get into the service menu to align the shift control as it sits at about 1 o'clock when both USB and LSB have the same tone. I've tried the UP/DWN/FAST on the mic while turning on the radio but the regular display just keeps coming up. The up and down buttons are working fine on the mic, but when I press the fast button, the FAST icon does not appear on the screen. Possibly a bad wire inside the mic?? Should the FAST icon come on when activating it from the mic? Everything else appears to be fine, showing full power on HF, 6 and 2m. My 440 antenna has a PL259 on cable, working on getting an adapter! Any pointers appreciated. Thank you, Max VE3TMT
|
|
Third harmonic problem?
Don't know if every radio ever made has the same 'feature' but... Tried to contact the ISS during field day Uplink 145.990 FM Downlink came out to around 437.962.3 FM clear receive signal. As soon as I hit TX the receive signal display goes full scale and all incoming audio is blocked out...and in some cases an audible feedback was heard. This was replicated with the radio transmitting into a dummy load with no antenna on the receive side and RF power turned all the way down. it is somewhere around a 20khz range where it feeds back, then drops off to quiet beyond that. We have two radios of similar age and they both do the same thing on that frequency pair. Has anyone else ever noticed this? Is there some setting wrong on our radios? Is there some filter that needs to be replaced? Like I said this was during FD, and other locations were able to contact the ISS with apparently no problem...we didn't have this issue on any other satellite- FM or Transponder. Mike KF5DEY
|
|
My FT-847 won't transmit on 80m
14
I have an 847 that I use almost exclusively for VHF/UHF week signal work and for satellites but it got pressed into service for our local club's Field Day this last weekend. It performed perfectly on 10, 15, 20, and 40 but when trying to transmit on 80 meters the display reads "ERROR". This happens whether the radio is set for CW, SSB, AM or FM and it doesn't seem to matter is PTT is asserted via the DATA IN or PKT connectors, the footswitch connector, or the front panel mic connector. Again, only 80m is effected. I know from reviewing the manual that the radio will display ERROR if one tries to transmit out of band but I was testing on 3.850 MHz. Has anyone seen this before and if so what's the resolution? Thanks de K?EKL
|
|
Using FT-847 as an oscillator for practice
10
Hello, I will be learning Morse code and would like to use the FT-847 for practice as an oscillator before going live some day. How do I use the radio as an oscillator without going over the air? Thanks, Steven/kc3dow.
|
|
Strange situation om my 847 . I've a black semicircle band over the satellite write over the display, mybe is not a defective display, or at least seems. Seeing through the glass with a lamp and a lens I was able to see that the satellite tacking sign is still present. Question: Someone has disassembled the frontal and has idea on what could be, it seems a black tape. 73 de In3aqk
|
|
WTB: Yaesu FT847
5
I am looking for a Yaesu FT847 if anyone has an extra one for sale. Let me know the price shipped to zip code 73507 and what all comes with it. Want one that is in perfect operational condition. Physical condition less important. 73 John AF5CC
|
|
FT-847 CAT Control Problem
15
Greetings All While I am trying to get my 847 setup for digital operations such as FT8, I have come across a CAT control problem. My rig is from 1990, serial 0M45xxxx so it shouldn't have any difficulties. I tried a CPU reset with no change. I can get the FT847UNI drivers working in JTDX, but not the Bi-Directional driver. While this might be the bare minimum necessary for digital operation, I would like to get the OmniRig drivers working so that I can get my logging program (Log4OMv2) working alongside another app to follow the freq. I know there is a HamLib option in Log4OM, but I can't get that to work (it is native in JTDX) so I am wondering... Is there anyone who has their 847 working with bi-directional CAT control? If so, what cables are you using with what software? Micky K1XH
|
|
Good evening! I have an FT-847 that I have had a good while and only used it on VHF (6 and 2 meters mostly, some satellite). The transmit audio sounds FB on upper sideband, but on lower, (75 meters) it sounds terrible. I have tried to see how to validate the carrier frequency for LSB, but not finding a setting or trimmer that affects the frequency in any way on either sideband. Any suggestions? Thanks Victor
|
|
My basic problem is I seem to have lost Mic audio after Q1053 there is nothing coming out of Pin 4. Pin 4 travels half way around the radio and ends up at Q1038 Pin 6. Q1053 is an electronic attenuator controlled by Pin 3, this does move up and down with the mic gain control. If I switch the monitor on I hear my Mic audio coming out the speaker, so this obviously takes another path. Not sure where. There are no voltages or waveforms on the technical supplement, so I have no of knowing what is normal. The output of IC Q1063 ends up on Pin 12 on IC 1C1081 (switch) which in accessible on the top side of the AF board. The Voltage levels on Q1053 would also be useful, if you can get there and measure them. Is there any way anyone could scope a working model and let me know if audio is getting through and roughly the levels? This way I know roughly where my fault lies? 73 Andrew G8UUG
|
|
Dear Owners, took delivery of the parts on Saturday and took some time out to fit them today and can report after gutting all the burnt carbon and working the board. New components are in and following Andrews advice set TC1001 to null while checking the other test points. SWR is 1.02:1 on nearly all bands into a Comet H422 at 3 meters (my test antenna). Working well. Thanks to everyone who participated and hope I can return the favour in the future. See the repair which was challenging and used non conductive glue to stick down the core and prevent it moving. Before After I know the board still looks burned but it’s back to good FR4 I assure you. The photo doesn’t do it justice. 73 and hope to catch you all in my log soon. De Spence M0STO Sent while portable! please excuse typos.
|
|
Hi, a strange question. I had been given an FC20 many years ago by a ham now sadly SK and it seems to have had a mini melt down. Inside near the control port there’s a sensing inductor and the surrounding parts have burned out. As it’s on the input I can only assume it’s been driven with excessive power somehow or some other issue. There is a 20pf trimmer and on the schematic it claims to be Null adjust. I believe it’s in the VSWR forward and VSWR reverse sampling however it’s on the transceiver side so I’m trying to get my head around why the parts burned out. It seems a resistor 27ohm took the brunt but melted TC1001 in the process and much of the PCB tracks. I’m replacing all surrounding components regardless as they amount to pennies but can anyone clarify what null adjust as I can only assume it’s a reference to 50ohm and FSD on reverse.? As it’s coupled to TP1008 a test point I assume one hooks up equipment here to adjust null. If anyone has a service manual about as I’m not sure one was ever issued. Any information on what null adjust is would be helpful if it’s in the service manual. Many thanks in advanced, De Spence M0STO Sent while portable! please excuse typos.
|
|
Following on from my email and see that VF and VR go to the MCU De Spence M0STO Sent while portable! please excuse typos.
|
|
Hi, I have been trying to connect my FT-847 to my RigPi. After a few unsuccessful attempts (many), I then tried to use flrig via a USB (CH340), CAT-847, FTBCAT and FTBASICMMO. In some cases, the 'CAT' symbol appeared on the rig, but the radio failed to connect. I've read the posts on the serial number saga and unfortunately my serial number is 4M950027. Anyway, while trying out the programs above, I found something called CommsTester and this allowed me to 'see' the incoming data while tuning the rig.This is what is see: CommTest Version 1.1.8 Received FF00 on COM 5 Received 20FE00 on COM 5 Received 20FA00 on COM 5 Received 20FE00 on COM 5 Received 20FA00 on COM 5 Received 20F600 on COM 5 Received 20F200 on COM 5 Received 20EE00 on COM 5 Received 20EA00 on COM 5 Received 20E600 on COM 5 Received 20E200 on COM 5 I haven't been able to decode the data yet, but would this kind of patch work? See https://pages.cs.wisc.edu/~timc/e/ft847/ See: Mon Jun 9 23:09:52 CDT 2014 [CC-USB232 ] Yaesu have just mentioned that they do not support the firmware update at present. Are there any other avenues open for me? Many thanks Ravi
|
|
No TX on AM, SSB, on All Bands FM works fine
I wonder if any one can help me, my FT847 stopped transmitting on LSB, USB and AM, FM is fine with Full 100 Watts on HF and 50 Watts on VHF. I traced the audio going in and it gets to Q1043 at TP 1035, there in no audio I removed Q 1063, and the audio is back, Q1063 is is a voltage controlled attenuator, as it has an OP Amp on its input, this could result in a "virtual earth" on pin2 and the signal is getting dropped across the preamp transistor, however there is nothing coming out of Pin 4 which goes off to the Balanced Modulator eventually. There is a good 455 KHz if signal present at the Balanced modulator. The mic audio enters the radio via Transistor Q1043, then trough a cap into Q1063, on TP 1035 three was no audio! Rather odd. No Q1063 is an electronic controlled attenuator controlled by a voltage on pin 3, this voltage come from IC1093 pin 3. Now IC1093 is a strange device it received digital data from Q1105 the main Yaesu 100 pin microcontroller, as you turn the mic gain control up and down it sends a series of data to Q1053, and this turn send a voltage out to control the attenuator. To make matters more interesting the data is only a few bytes sent in less than a milli-second and only when you change the mic gain or select AM SSB, CW, of FM, the data is not continuous. My 2GB/S digital scope did capture the data, without it I would have been snuck! I do not have a decent copy of the FT847 service manual, all the ones on line are photocopied and low resolution and when you blow them up they are unreadable, however, Roger came to my rescue, as he had a genuine FT874 service supplement. Anyway this took 5 days to sus out, as I had no block diagram and no component over lay that I could read, so it took me up to 4 hours to trace each part and make measurement, some components were on the reverse side of the AF main board. To make matter worse, there are some undocumented mods on the back of the board close to the audio input attenuator, This digital transistor shorts out Pin 3 and 5 on IC1063, which increases the attenuator to Max, i.e. no AF signal leave pin 4 to the balanced modulator for SSB and FM. However, there should be a healthy signal on Pin 4 and there is none, as the voltage goes up and down on Pin 3 in sympathy with the Mic gain control, the inhibit is not active. ( I have no idea when the inhibit kicks in) I have enclosed the data sheet for IC 1093, by no means a simple device. Removing IC 1063 restores the audio to TP1035, : ? I have ordered a new attenuator chip, and will solder it when it arrives fingers crossed! ( I am not holding my breath on this one) any pointers in the right direction would be nice? 73 Andrew
|
|
FT847 FAN replacement ...
7
Where can I find a replacement fan for the FT847 and how to do it? it got very loud as soon as I turn on the transceiver! Thanks 73
|
|
FT847 calibrate the V / U frequency
8
#tip
HI all With the FT847 in VHF and UHF I have verified that they are off frequency of + 250Hz. Does anyone know where in the radio I find and how can I correctly calibrate the right frequency? 73
|
|
I tried the QH40A crystal heater mod as presented all over the internet. However, it did not work out for me ( my FT847 is a 2004 model). I can't quite figure out how it is possible that for some people this mod actually DOES work. The FT847 is using a reference crystal especially cut to be stable at or around room temperature (25C). What you actualy do with the QH40A crystal heater is bringing your crystal to a very stable 40 degrees, a temperature on which the FT847 crystal itself is ...unstable. What you gain (at best) is...nothing. On the contrary, with the QH40A installed, the frequency on my FT847 is continuously increasing at a 1Hz per minute rate (on 144Mhz) for hours on end. Without the mod, at least it more or less stabilize after a while. Crystals to be used in an oven are cut very differently.
|
|
S9 noise on HF with or without antenna
3
Dear Group, I have a bit of a strange question. My FT847 has nothing but S9 of noise on HF (I work mostly satellite these days so only just noticed it). I tried all bands but seem to be blighted with an S9 signal with or without the antenna connected. The other issue is when I tune to a strong AM station in the lower broadcast band 2.2mhz seemed to be the strongest +50db on AM but the audio is dreadful and sounds splattered, clipped and inaudiable. I have been using a passive loop on HF and I’m fearing DC or a strong signal has landed in the front end and done damage. Before I tear my radio apart to resolve this I wondered if anyone had pointers. I know the FT897 used to suffer with S9 all the time due to the 455khz ceramic filters going bad but don’t think the FT847 uses them. Any help would be really appreciated. thanks in advanced, de Spence M0STO see below the test gear on hand to resolve this. test gear: Marconi 2955 radio test set Marconi 2022 Signal Generator Rigol DSA1030A spectrum analyser Phillips 3833 60mhz Scope AF generator VVM logic probe etc. GDO
|
|
Dodgy Rotary switch
3
Hi All, I have one little problem with my 847.the MEM/VFO CH rotary seems dirty.... i.e. it jumps around in frequency sometimes when I turn it. Would it be safe to start spraying switch cleaner at it? TIA Rob G4UJS
|
|
Replacement parts needed.
8
Greetings. I need to replace the components (encoders?) for the SUB-TUNE and MEM/VFO CH controls on my rig. It got dropped and the shafts broke off. I MIGHT be able to glue/epoxy one of the shafts together, but the other is irreparable. The PC board IDs are S6531 and S6538, but that's the best I can do for identification. Any hints on what parts I might search on at DigiKey or Mouser or whatever would be appreciated. 73 Brad, N7IVV
|
Image Name
Sat 8:39am
Sat 8:39am