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Re: No transmit function on 2M

 

I have a gen 1 FT-817.? Recently replaced the finals board (had very low power on TX all bands).? Incidentally the board is still available from Yaesu for $24.? P/N CB1333004.
?
I thought I had the problems solved, however now I have discovered no TX power on 2M band.? Other bands are fine.? ?I plan to dig in the diode issue next.? Has anyone found a video or guide to assist with this repair?? I've looked around the web and not much out there for this specific issue.? ?Looking for any high res photos of the PCB and the diodes.? I understand need to get under the main PCB.? ? Thanks for any advice.
FT-817 + QLOG & CW

 

HI
I'm using my FT-817 with cat in the QLOG log (Linux version).
?
Does anyone use it? Did you manage to configure the CW?
?
73 de PY2ZA jr?
Re: TX ERR on 40m from .101 to .200

 

"I did mine via the “jumpers” sadly a side effect is losing the ARS functionality.

73 de G0FVT"

?
?
I recall reading somewhere that loss of the automatic repeater shift is dependent upon whether or not that facility is enabled prior to carrying out the mod. I'm sorry that I can't remember which state it needs to be in before going ahead nor any citation. It could well be in Clint's excellent website? A web search then ...
--
Steve, G4VRR.
Re: TX ERR on 40m from .101 to .200

 
Edited

“Does anybody know if the Japan version of the FT-817ND can be configured to match the US band plan?
Serguei VE3KDE”

No. Nice try, though.
Re: TX ERR on 40m from .101 to .200

 

This mod should get you aligned with the US band plan?
?
Good luck,
?
tom
kj5dyu
Re: TX ERR on 40m from .101 to .200

 

Hi have a look in the service manual,? you can change the links on the back of the display for band plans
Dave 2E0DMB?

On Tue, 28 Jan 2025, 06:55 Benjamin ON5BGO via , <on5bgo=gmail.com@groups.io> wrote:
Thanks Nick for the trick. I downloaded his software. But that widely opens the 817, not only the second part of the 40m Band (or the 60m Band).?
Is there another kind to open just our ham’s bands ?
?
Ben.?
Re: TX ERR on 40m from .101 to .200

 

Does anybody know if the Japan version of the FT-817ND can be
configured to match the US band plan?
Serguei VE3KDE

On Tue, Jan 28, 2025 at 1:55?AM Benjamin ON5BGO via groups.io
<on5bgo@...> wrote:

Thanks Nick for the trick. I downloaded his software. But that widely opens the 817, not only the second part of the 40m Band (or the 60m Band).
Is there another kind to open just our ham’s bands ?

Ben.
Re: TX ERR on 40m from .101 to .200

 

Thanks Nick for the trick. I downloaded his software. But that widely opens the 817, not only the second part of the 40m Band (or the 60m Band).?
Is there another kind to open just our ham’s bands ?
?
Ben.?
Re: TX ERR on 40m from .101 to .200

 

Try a search for "M0BMN widebander". That was the software I used to use to unlock coverage for 60 meter operation.
FT817 over-currents in tx on 18Mhz (17m) and 21Mhz (15m) - any ideas?

Queuerious Guy
 

HI all,?
I am trying to repair an early model FT817. It is fine on all bands/modes in RX.?It is fine on TX in all modes, except for 18Mhz (17m) and 21Mhz (15m).?
In the affected bands, measured in CW, the rig draws 3A+ from the bench psu, and RF filter relays buzz loudly. This can trigger a shutdown, or the rig stays on and buzzes terribly.?
?
My analysis so far - testing in CW mode: the preamp/driver stage works well. This feeds into the PA finals board, which seems to amplify happily - but supplies too much current in the affected bands. If I separate the predrivers/PA final stage from the RF filtering stage at the balun (T3001 in schematics), and insert a dummy load to absorb the PA final output, the TX works normally (~2A PSU current draw) on ALL BANDS.?
?
This suggests the issue is the balun itself or after the balun in the RF filtering stages.?
?
According to KA7OEI's fantastic info pages, , 20m & 17m use the same RF filter FIL5, while 15m, 12m & 10m all use FIL6. Given 20m and 12m/10m work ok, this suggests the issue is not in the RF filters themselves, since they work happily 'half the time'.
?
Through experimentation, I notice that reconnecting the balun (T3001) to the RF filter board via an inductor of ~0.3uH (originally discovered after using basic crocodile clip cables to reconnect the stages together), the TX over-current stops - and the rig operates as normal, except for the introduced inductance that rises with frequency, hence lowering the output power (and lowering the PSU current draw) with rising TX frequency. This 'fix' itself causes problems on 50+VHF/UHF I think.
?
It suggests to me there is some low impedance path to ground around 20Mhz (affecting 18Mhz & 21Mhz), and have pulled the board out of the rig to take a look. But nothing seems immediately wrong.?
?
Has anyone experienced similar TX over-current on specific bands, where other bands work fine ? Could the issues lie in the RF filters? How best to test balun T3001 to check if it is at fault?
?
Any ideas or suggestions are greatly appreciated,?
73 de
Matt Nassau, M0NJX
Re: Ft817 shuts off at 10 volts?

 

The Windcamp battery also works below 10v.


On Sun, Jan 26, 2025, 10:27 Mike Davis via <maddmd818=gmail.com@groups.io> wrote:
Or, it's tired. May need a new one.

Mike WA1MAD

On Sun, Jan 26, 2025, 11:25?AM Albert Marsh via <hitekgearhead=hotmail.com@groups.io> wrote:
I was thinking the same thing. The Windcamp is a 3 series lithium-polymer. Cutoff being between 2.5-3.0V per cell at the lowest, and 3.0-3.5V per cell on the conservative side, could easily land you in the area of 10V total pack voltage when the BMS shuts down the output.
?
-Albert
KI4ORI
Re: TX ERR on 40m from .101 to .200

 

Hi all, sorry to undig this topic but I'm testing a FT-817 for a friend and saw that exact problem : TX ERR above 7.100 kHz. Could someone gives me a start point, as the previous pdf link is not available anymore ?
Thx, 73 Ben - ON5BGO
ALC throwing tantrum

 

Hello,

I'm using a generic CAT bluetooth device paired with a DIN/P2 cable connected to FT8CN for an FT8 interface. Out of whim, once or twice, if I TX at 5 W on 10 m, the ALC goes to 0. If I change the power to 2.5 W (only change I make on the rig), ALC goes to "4 bars".?After a couple?of TX's in this configuration if I change the power back to 5 W, ALC stays at "4 bars" permanently.

Any suggestions what might be causing it?


Daniel PY2TDB.
Re: Ft817 shuts off at 10 volts?

 

Or, it's tired. May need a new one.

Mike WA1MAD

On Sun, Jan 26, 2025, 11:25?AM Albert Marsh via <hitekgearhead=hotmail.com@groups.io> wrote:
I was thinking the same thing. The Windcamp is a 3 series lithium-polymer. Cutoff being between 2.5-3.0V per cell at the lowest, and 3.0-3.5V per cell on the conservative side, could easily land you in the area of 10V total pack voltage when the BMS shuts down the output.
?
-Albert
KI4ORI
Re: Ft817 shuts off at 10 volts?

 

I was thinking the same thing. The Windcamp is a 3 series lithium-polymer. Cutoff being between 2.5-3.0V per cell at the lowest, and 3.0-3.5V per cell on the conservative side, could easily land you in the area of 10V total pack voltage when the BMS shuts down the output.
?
-Albert
KI4ORI
Re: Ft817 shuts off at 10 volts?

 

Just a thought - if the battery has an integrated BMS then it may be that that's cutting out rather than the radio.?
?
Cheers,?
Ronan
MM0IVR?
Re: Ft817 shuts off at 10 volts?

 

Just to add that it's best to measure the voltage at the dc connector so as to take into account any voltage drop in the power lead.
Also IIRC Yaesu recommend using 13.8v as input if calibrating the voltage parameter,? it's in the service manual I think.
Andy
Re: Ft817 shuts off at 10 volts?

 

The radio will work below 10v, the stock NiMh pack is 9.6v, you usually won't get full power at that voltage.

There is a volt meter calibration in the service menu. I have done this, as in measure the battery with a DVM, then turn on the rig and correct what it displays. So there is a chance your battery is very low, but falsely displaying 10v.


On Sat, Jan 25, 2025, 18:29 Mike S. via <Ducmike2=outlook.com@groups.io> wrote:
The Radio or the battery??
Re: Ft817 shuts off at 10 volts?

 

The Radio or the battery??
Re: Ft817 shuts off at 10 volts?

 

I thought 11 volts was the minimum it would work at.

Zack W9SZ

On Sat, Jan 25, 2025, 8:02 AM Ducmike2 via <Ducmike2=outlook.com@groups.io> wrote:
Hello group! I recently bought a non- ND model Yaesu Ft817 that has the Windcamp 3000mah battery installed. I can charge the battery up to 12v but, once voltage drops down to around 10v the rig shuts off. Is this normal? Any help would be greatly appreciated. 72 Mike
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