I have a 847 that had been
working fine until I started tinkering with the DATA IN/OUT jack
trying to interface a computer.? Now when I turn power on it is
in TX continually and cannot get it out? Nothing but DC power
and antenna connected.? Think something got blown on that
circuit.? Unable to make any changes. Anyone every working in
that area.? 73 Mike K4PI
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Dear Stanley, ? I good suction desoldering tool will help here to get as much solder off as possible, there are two ways, I find with a broad soldering tip and an iron of around 60-80 watts, flux the area and use a surgical scalpel to get under each leg and lift up, it gets easier the more legs you lift up, take it slow and steady, sometimes it helps to add a bit of fluxed fresh solder. ? If this does not work then there is insufficient heat from your iron, so stop, for example use a temp controlled iron like a Weller 1201A or WPS80, ? The second way is to cut the body of the transistor out then lift the legs, this depends on how much clearance you have? ? Make a note of any other component soldered close by, there are often base emitter and base collector caps to neutralise inductance. ? The 847 PA transistors are quite robust are you sure they are dead, ?check the bias set up procedure, the transistor bios pots have been known to fail, do you have 0.6 to 0.7V on the base of the PA transistors ? ? The previous stages are FET, so some 3-4Volts ? 73 ? Andrew G8UUG ?
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From: [email protected] <[email protected]> On Behalf Of Stanley Engel
Sent: 02 June 2024 16:05
To: [email protected]
Subject: [YaesuFT847] ftm100 PA? what is a good procedure for removing the PA from the FTM100 motherboard? I have used solder wick to remove most of the solder but of course it is still attached. I have no special tools for that. Any ideas?
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1)? At a bare minimum you need a hot air rework station.?
2)? Better is a hot air rework station and a PCB preheater.?
3)? Best is what I use which is a automated computer controlled rework station that runs through a stepped temperature PCB preheater cycle, stepped temperature reflow and automated suction pic of the part off the board.? Once set up it's a fully automated process.? After PCB cleaning it does basically the same but in reverse and after the new part has been reflowed onto the PCB goes through a stepped down cooling cycle.? It's the same machine I use for replacing BGA processor chips.
No matter what you use make sure you don't use more heat than needed or you risk damaging the PCB or thermally damaging the component.
Mikes Radio Repair
KC3OSD
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what is a good procedure for removing the PA from the FTM100 motherboard? I have used solder wick to remove most of the solder but of course it is still attached. I have no special tools for that. Any ideas?
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Re: C1200 on AF-CTRL board
Thank you very much for this info, A65BR Oleg.
You are rigth, the capacitor is C1280, see attached photo.
Thanks, OZ1BXM Lars?
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Re: C1200 on AF-CTRL board
Near Q1107 opposite pins 13,14 located C1280 0,0022 mkF 50V ?
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From: [email protected] < [email protected]> On Behalf Of oz1bxm_lars_petersen via groups.io Sent: Thursday, May 16, 2024 12:49 To: [email protected]Subject: [YaesuFT847] C1200 on AF-CTRL board ? Hello group,
I've replaced the chip Q1107 on the AF-CTRL board, but I lost C1200 (sits near Q1107), and I cannot find a parts list for FT-847.
Does anyone know the value of C1200 on the AF-CTRL board?
Thank you.
OZ1BXM Lars
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Re: C1200 on AF-CTRL board
Hi Lars I have Tech Supplement, C1200 on AF-CNTL Unit has 0,01 mkF 25V Tol B, Yaesu p/n K22144802 ? 73 Oleg A65BR ? ?
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From: [email protected] < [email protected]> On Behalf Of oz1bxm_lars_petersen via groups.io Sent: Thursday, May 16, 2024 12:49 To: [email protected]Subject: [YaesuFT847] C1200 on AF-CTRL board ? Hello group,
I've replaced the chip Q1107 on the AF-CTRL board, but I lost C1200 (sits near Q1107), and I cannot find a parts list for FT-847.
Does anyone know the value of C1200 on the AF-CTRL board?
Thank you.
OZ1BXM Lars
|
Re: C1200 on AF-CTRL board
HI Lars ? I could find Q1107 on the schematic diagram, maybe you can find C1200 ? if I see C1200 is around pin 12/13/14 of Q1107 ? ? Good Luck ? Sjoerd PA3DOL ? 
?
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From: [email protected] <[email protected]> On Behalf Of oz1bxm_lars_petersen via groups.io
Sent: donderdag 16 mei 2024 10:49
To: [email protected]
Subject: [YaesuFT847] C1200 on AF-CTRL board ? Hello group,
I've replaced the chip Q1107 on the AF-CTRL board, but I lost C1200 (sits near Q1107), and I cannot find a parts list for FT-847.
Does anyone know the value of C1200 on the AF-CTRL board?
Thank you.
OZ1BXM Lars
|
Hello group,
I've replaced the chip Q1107 on the AF-CTRL board, but I lost C1200 (sits near Q1107), and I cannot find a parts list for FT-847.
Does anyone know the value of C1200 on the AF-CTRL board?
Thank you.
OZ1BXM Lars
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Re: FT-847 use with transverter for 144 MHz from 28MHz
At this point, the transmit level needs to be 5 Watts (+37 dBm) for driving my current transverter(s).
So, just using the normal output, not any taps internal to the rig.
--
Cam, W4XXV
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Re: FT-847 use with transverter for 144 MHz from 28MHz
Was the plan to use 0db as the drive level, if so the lpf issue won't be a problem because your bypassing the PA
I should have added? "and other transverters".
I also want to make use of 222 MHz as well, requiring the use of 28-31 MHz transmit.
So, the question still stands.
--
Cam, W4XXV
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Re: FT-847 use with transverter for 144 MHz from 28MHz
I should have added? "and other transverters".
I also want to make use of 222 MHz as well, requiring the use of 28-31 MHz transmit.
So, the question still stands.
--
Cam, W4XXV
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Re: FT-847 use with transverter for 144 MHz from 28MHz
Cam, why do you want to use a transverter with the FT-847?? ?Is there something deficient?with the 2M mode of the Ft-847?? If so, seems like it would be far easier to address the problem than to go the transverter route.
73,
Tom K6EU
You can easily change the FT847 to TX from 144 to 174 MHz, ? Also the use version goes from 144 to 148, ?
? ? ? 73 ? Andrew ? ? ? From: [email protected] [mailto:[email protected]] On Behalf Of Cam - W4XXV
Sent: 15 April 2024 18:05
To: [email protected]
Subject: [YaesuFT847] FT-847 use with transverter for 144 MHz from 28MHz ? Hello all,
I'm trying to research the capabilities of the use of the FT-847 with a transverter, requiring the use of 10 meters. The issue may be the requirement for opening transmit to 32 MHz to get to the top of the 2 meter band. For this transverter, 28 MHz = 144 MHz, and 32 MHz = 148 MHz.
I know that it's possible to modify the FT-847 to transmit above 30 MHz, but I've seen reference to the low pass filter being a possible issue.
Does anyone have experience with this, and are there any gotyas?
Thanks,
--
Cam, W4XXV
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Re: FT-847 use with transverter for 144 MHz from 28MHz
You can easily change the FT847 to TX from 144 to 174 MHz, ? Also the use version goes from 144 to 148, ?
? ? ? 73 ? Andrew ? ? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Cam - W4XXV
Sent: 15 April 2024 18:05
To: [email protected]
Subject: [YaesuFT847] FT-847 use with transverter for 144 MHz from 28MHz ? Hello all,
I'm trying to research the capabilities of the use of the FT-847 with a transverter, requiring the use of 10 meters. The issue may be the requirement for opening transmit to 32 MHz to get to the top of the 2 meter band. For this transverter, 28 MHz = 144 MHz, and 32 MHz = 148 MHz.
I know that it's possible to modify the FT-847 to transmit above 30 MHz, but I've seen reference to the low pass filter being a possible issue.
Does anyone have experience with this, and are there any gotyas?
Thanks,
--
Cam, W4XXV
|
FT-847 use with transverter for 144 MHz from 28MHz
Hello all,
I'm trying to research the capabilities of the use of the FT-847 with a transverter, requiring the use of 10 meters. The issue may be the requirement for opening transmit to 32 MHz to get to the top of the 2 meter band.
For this transverter, 28 MHz = 144 MHz, and 32 MHz = 148 MHz.
I know that it's possible to modify the FT-847 to transmit above 30 MHz, but I've seen reference to the low pass filter being a possible issue.
Does anyone have experience with this, and are there any gotyas?
Thanks,
--
Cam, W4XXV
|
Well the SignaLink USB working great on the 847. 30w out got Japan on my G5RV. 215222 -4 0.1 1104 + CQ JG3LGD PM74
?
215230 Tx 829 + JG3LGD KJ4DHF FM17
215237 -5 0.2 1104 + KJ4DHF JG3LGD -06
215245 Tx 829 + JG3LGD KJ4DHF R-05
215252 -4 0.2 1104 + KJ4DHF JG3LGD RR73
215300 Tx 829 + JG3LGD KJ4DHF 73
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John,
There some magic inside that SL to close the circuit to allow the audio to pass to Tx on the rig. I just cannot figure out what is happening to make it work with the Easy Digi board and the pg 16 drawing from the 847 manual.
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Correct; the 847 doesn't do VOX, but I believe the SignaLink does.?
That was the only way it made sense to me that things were working.?
The SignaLink was keying the rig via its own internal VOX, and the
CAT, while also keying the rig, was overruled by the rig seeing PTT
on the Data port so getting the audio signal from there.?
If setting WSJT-x to VOX still has the 847 going into transmit, it
must be due to the SignaLink providing that function.? From what you
write, making only the change to the WSJT-x software for VOX did
nothing?? THAT I can't explain.? If the only PTT being recognized by
the 847 was coming from CAT, and the audio only coming in from the
Data port, that shouldn't have worked unless the signal was really
really loud.? What was it set to?
Greg? KO6TH
John P. wrote:
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Tim,
I took up your request to test the keying my radio using a
SignaLink and VOX.? My Audio is fed from the SignaLink to the
radio using the SLCAB847 cable, plugged into the Data In/Out jack
located under the HF SO239 connector.
I wasn't able to complete the test VOX keying with SignaLink audio
because the FT-847 does it does not support VOX.? I searched the
manual and the internet before coming to that conclusion.? Using
WSJT-X I tested the remaining two PTT options, DTR & RTS, and
my radio would not transmit with either of those selected.? The
only way that I can make my radio transmit is by using CAT PTT.
I also tested a couple of older AFSK programs with my SignaLink
and CAT control.? Testing with FLDigi, my radio would transmit as
long as I select FLRig as the rig control option, and FLRig is
configured for the FT-847 with the COM port & baud rate set.?
I also tested DigiPan and the radio will transmit if I select the
COM port that is connected to the radio.? It's interesting to note
that DigiPan does not have a setting for the baud rate, but it is
set in my computer to match the rate that my FT-847 is configured
for.
73,
John
AB0VX
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Tim,
I took up your request to test the keying my radio using a SignaLink and VOX.? My Audio is fed from the SignaLink to the radio using the SLCAB847 cable, plugged into the Data In/Out jack located under the HF SO239 connector.
I wasn't able to complete the test VOX keying with SignaLink audio because the FT-847 does it does not support VOX.? I searched the manual and the internet before coming to that conclusion.? Using WSJT-X I tested the remaining two PTT options, DTR & RTS, and my radio would not transmit with either of those selected.? The only way that I can make my radio transmit is by using CAT PTT.
I also tested a couple of older AFSK programs with my SignaLink and CAT control.? Testing with FLDigi, my radio would transmit as long as I select FLRig as the rig control option, and FLRig is configured for the FT-847 with the COM port & baud rate set.? I also tested DigiPan and the radio will transmit if I select the COM port that is connected to the radio.? It's interesting to note that DigiPan does not have a setting for the baud rate, but it is set in my computer to match the rate that my FT-847 is configured for.
73,
John
AB0VX
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No worries Spence. Maybe this will help the next new owner of 847.
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Andrew Lenton
Mike KC3OSD
oz1bxm_lars_petersen
