How do you have things wired?? A pencil scribble diagram will help a
lot.
Greg? KO6TH
HI8RMQ via groups.io wrote:
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Thank you very much. But now I cant use the radio on Ssb HF.
Something can be done?
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Thank you very much. But now I cant use the radio on Ssb HF. Something can be done?
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Correct.? The audio is "basically" gone, down probably 50+ db.? I
was able to force a marginal FT-8 signal through from the back by
moving it from a "Line Out" jack on the PC to the Speaker out, and
cranking up the volume.? The radio survived doing this once, but I
do NOT recommend this.
What you describe is definitely a problem, but it's in the design
of the rig, not your particular copy.? All 847's behave this
way.? To use FT-8 or Packet radio you need to key the rig via the
same port the audio is coming in on (TRS for HF SSB, DIN for VHF/UHF
FM), and NOT use CAT for keying / PTT.? The alternative is to use
CAT for keying the rig, but wire your audio input into the Mike
connector on the front.? You choose one method or the other.? You
cannot do both (CAT for PTT, rear jacks for audio) with the 847.
Greg? KO6TH
HI8RMQ via groups.io wrote:
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Yes, but talking very loud you may get maybe 5w in SSB. In Fm
(Hf only) or am, is barely audible. Carrier is good, 100W in Fm,
but modulation almost gone. It works fine in vhf and uhf. Have 2
radios, same problem.
_._,_._,_
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Yes, but talking very loud you may get maybe 5w in SSB. In Fm (Hf only) or am, is barely audible. Carrier is good, 100W in Fm, but modulation almost gone. It works fine in vhf and uhf. Have 2 radios, same problem.
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I have noticed that I can have the 847 on for a while and then when key the CW key, the speaker volume suddenly increases.? Anybody else experience this?? It don't know if the receive sensitivity has gotten better or not.
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On more question if you key the transmitter with te mic in ssb, is it working?
--
Greetings from Erik Rothuis (PA2ER), Terborg Netherlands.
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Right.? If you key with CAT, but feed the FT-8 / Packet audio in
from the back, the audio will not reach the transmitter.? SSB will
have no output, and AM / FM will be carrier only.? The only way to
use CAT is to feed the audio in from the Mike jack in the front
(which is annoying).? Yaesu expects you to key the rig from the TNC
via the jacks on the back of the rig.? Look in the manual, pages 16
& 17.
If you key with CAT and then talk into the microphone, you should
see proper power and audio in all modes.
Greg? KO6TH
HI8RMQ via groups.io wrote:
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Keying with CAT, but those radios are not in use anymore, the
have no output in HF SSB. They have carrier in Fm, Am, but no
modulation.
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Keying with CAT, but those radios are not in use anymore, the have no output in HF SSB. They have carrier in Fm, Am, but no modulation.
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How are you keying the rig?? If you key the rig with CAT, the audio
needs to come in from the mike plug in the front.? Key the rig via
the TRS jack, feeding audio in to the same, and it should work.?
Similarly, if you are doing VHF/UHF packet, key the rig and feed
audio into the DIN port.? For the TRS port, you'll need a resistor
and DC-blocking cap to merge the audio and PTT signals; it's the
same "interface" as is often used to interface to an HT.? The DIN
port has separate PTT and Audio pins, but it's for FM Packet.
For some unknown reason, keying the rig via CAT takes the audio from
the mike input, which is probably the least useful place to take it
from.
Greg? KO6TH
HI8RMQ via groups.io wrote:
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I have seen some 847 with the same problem, and there's a
common thing, they all where using some interface for FT8.
Maybe an excesive audio or impedance problems, I dont know,
fry something related to the modulation stage. There is a
carrier, algo works in 2m, but in HF is gone, so SSB obvioulsy
wont work. Have a tech friend with 3 847 with the same problem
and cant proceed properly because cant find a decent service
manual. Any help will be appreciated.
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I have seen some 847 with the same problem, and there's a common thing, they all where using some interface for FT8.
Maybe an excesive audio or impedance problems, I dont know, fry something related to the modulation stage. There is a carrier, algo works in 2m, but in HF is gone, so SSB obvioulsy wont work. Have a tech friend with 3 847 with the same problem and cant proceed properly because cant find a decent service manual. Any help will be appreciated.
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File /FT-847 Manuals/Corrections SM page 3-4.pdf uploaded
#file-notice
The following files and folders have been uploaded to the Files area of the [email protected] group.
By: Erik Rothuis <erothuis@...>
Description:
Correction and additional info on service manual page 3-4, about FM IF Adjustment and Carrier Frequency Adjustment
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Sounds like it is working
73
Andrrw
?Get BlueMail for Android ?
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On 10 Aug 2024, 20:36, at 20:36, Erik Rothuis <erothuis@...> wrote: I am repairing a FT847 from a fellow amateur. How is complaining on
broken-up audio, on more then 50 Watt HF. First we thought of RFI
coming back to the mic, but that was not the case, because it happend
on more antennas.
Now i have the transceiver here, in mij workshop. I found out that on
his power cord, he had 2 banana plugs, one cheep one, and a good one.
The cheep was very loose in the socket, and was not cooping with the
power, so there was a powerdrop of more than 3 volt. I changed the
banana plug and the transceiver is working fine now.
What i found was that the ALC meter never exceeded above the? max
limit, even with compressor on. Is that normal on a 847?
--
Greetings from Erik Rothuis (PA2ER), Terborg Netherlands.
|
I am repairing a FT847 from a fellow amateur. How is complaining on broken-up audio, on more then 50 Watt HF. First we thought of RFI coming back to the mic, but that was not the case, because it happend on more antennas.
Now i have the transceiver here, in mij workshop. I found out that on his power cord, he had 2 banana plugs, one cheep one, and a good one. The cheep was very loose in the socket, and was not cooping with the power, so there was a powerdrop of more than 3 volt. I changed the banana plug and the transceiver is working fine now.
?
What i found was that the ALC meter never exceeded above the? max limit, even with compressor on. Is that normal on a 847?
?
--
Greetings from Erik Rothuis (PA2ER), Terborg Netherlands.
|
Re: Serial cable question
?Hi Ron, ? ? ? ? ? ? To turn off CAT you just need to send 0x00 0x00 0x00 0x00 0x80 and that should turn off the CAT.?
? I’m now starting to get a feeling about this and wondered if you have an FC20 or other tuner “Yaesu or LDG” connected? Unfortunately, Yaesu made a slight error in judgement and it meant CAT and tuner shared the same part of the communications BUS. I was looking at a schematic last night (terrible quality) and saw the 9 pin connection for the D Sub and it as I suspected, goes to what appears to be a MAX232. There are lines tied together internally as would be expected to DCD etc. to DTR and RTS won’t do anything EVER, as only 2 pins and ground tie into the MAX232 and CPU. Unfortunately, Yaesu used a FIFO (first in first out) which meant Tuner took priority over CAT and neither worked correctly when the other was plugged in. I just want to eliminate that.
? Secondly, I wonder if you had an early radio that just had directional comms? We can determine this by the next set of commands. I am also doing this on my radio so that I can be sure it’s A) working and B) I’ve tested the method and I’m not missing points.
? The thought here is “we’ve made big progress”. In determining if the radio does receive commands….. it does. The CAT Icom normally means “in my opinion” that command to turn off CAT are obstructed. I’ve had this hundreds of times with Ham Radio Deluxe wanting to connect as and when it likes. It’s normally down to either FIFO buffers, latency in the command or a setting issue.
? ?I think we can now safely assume that 4800baud is the next best setting. The reason? In my experience it’s more tolerant to latency and buffer problems. Faster rates I found are great to move data but poor as stability and that’s the difference between a command sent and received. You don’t see garbage on the screen! You just don’t communicate at all. So please, for now let’s quickly set 4800baud as I’ve only ever had minimal issues at this rate.
?Please don’t think I’m schooling you but I am a real PITA when it comes to remote support and I would not make a good agent on the phone. So accept my sincere apologies if that is how I’m conveying myself.
See the video and also observe the RX and TX lights blinking on RealTerm. If you only get TX then we can safely say you have either a half duplex version, the RX line is damaged in the cable or you have a Tuner connected?
de Spencer G5STO
What is the voltage at the serial port on the radio?? Measure
between pins 3 & 5.
Greg? KO6TH
Ron Liekens via wrote:
Spence,
?
I did all you proposed, and it did go well. Things reacted
the way you demonstrated. Still no luck with the other programs
like HamRadioDeluxe, FL-digi, FTBasicMMO, FTBCAT or WSJT-X. Just
like before, Rats847 will connect, but has no feedback from the
radio. Seems commands are understood by the radio and there is
no duplex communication. The display CAT icon is still on,
though.
?
73' Ron
ON2RON
|
Re: Serial cable question
What is the voltage at the serial port on the radio?? Measure
between pins 3 & 5.
Greg? KO6TH
Ron Liekens via groups.io wrote:
toggle quoted message
Show quoted text
Spence,
?
I did all you proposed, and it did go well. Things reacted
the way you demonstrated. Still no luck with the other programs
like HamRadioDeluxe, FL-digi, FTBasicMMO, FTBCAT or WSJT-X. Just
like before, Rats847 will connect, but has no feedback from the
radio. Seems commands are understood by the radio and there is
no duplex communication. The display CAT icon is still on,
though.
?
73' Ron
ON2RON
|
First thing to do is see if the parts are even in the radio.? You will frequently find parts not used.? If they are used it's frequently in a tuned circuit like a filter network.
?
What are you trying to diagnose/repair?? What is the problem your having?
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Thanks for replay. But in the schematics that I downloaded here, the components are also marked with ***. If that meens that they are selected parts, how do you know what part to use? Because there are many parts in the schematic, with the value ***.
?--
Greetings from Erik Rothuis (PA2ER), Terborg Netherlands.
|
Re: Serial cable question
Spence,
?
I did all you proposed, and it did go well. Things reacted the way you demonstrated. Still no luck with the other programs like HamRadioDeluxe, FL-digi, FTBasicMMO, FTBCAT or WSJT-X. Just like before, Rats847 will connect, but has no feedback from the radio. Seems commands are understood by the radio and there is no duplex communication. The display CAT icon is still on, though.
?
73' Ron
ON2RON
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Here.? Just click on the files tab.
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I'd like to have the service manual, where can I find it?
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Andrew Lenton
Spence G5STO
Mike KC3OSD