Re: Ft817 shuts off at 10 volts?
I am confused on power out with the Windcamp battery setup. Is there a 5 watt setting??
Mike WA1MAD
On Thu, Jan 30, 2025, 2:49?PM Tobias KK7BCO/2M0TFF via <feltusfecit1= [email protected]> wrote: Roger that. I love the Windcamp battery, but find charging it hit or miss, and I have no idea why.
Sounds to me like the Windcamp BMS doing its job to protect the battery. I am on my second one of these. First one, the BMS isolated the battery on low voltage as I expected however it didn't come up to full voltage - I think one of the cells was failing. Second one did charge up to full expected voltage however, when I did a discharge test on it recently it just kept on going down to 8.0V until I lost my nerve and put it back on charge ! Did then recharge fully so hopefully no damage.?
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I think this battery is a big improvement on OEM but I am slightly suspicious about the extent of the BMS functionality. I would like to see firm evidence that there is cell charge balancing.
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Re: Ft817 shuts off at 10 volts?
Roger that. I love the Windcamp battery, but find charging it hit or miss, and I have no idea why.
Sounds to me like the Windcamp BMS doing its job to protect the battery. I am on my second one of these. First one, the BMS isolated the battery on low voltage as I expected however it didn't come up to full voltage - I think one of the cells was failing. Second one did charge up to full expected voltage however, when I did a discharge test on it recently it just kept on going down to 8.0V until I lost my nerve and put it back on charge ! Did then recharge fully so hopefully no damage.?
?
I think this battery is a big improvement on OEM but I am slightly suspicious about the extent of the BMS functionality. I would like to see firm evidence that there is cell charge balancing.
?
?
|
Re: Ft817 shuts off at 10 volts?
Sounds to me like the Windcamp BMS doing its job to protect the battery. I am on my second one of these. First one, the BMS isolated the battery on low voltage as I expected however it didn't come up to full voltage - I think one of the cells was failing. Second one did charge up to full expected voltage however, when I did a discharge test on it recently it just kept on going down to 8.0V until I lost my nerve and put it back on charge ! Did then recharge fully so hopefully no damage.?
?
I think this battery is a big improvement on OEM but I am slightly suspicious about the extent of the BMS functionality. I would like to see firm evidence that there is cell charge balancing.
?
?
|
Re: No transmit function on 2M
Hi KA6BPV,?
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I posted a video a few months ago in response to a Youtube viewer who had no TX on 70cms. The 2m VHF and 70cms UHF TX paths are very closely related, so this 70cms video will help you understand the potential areas to look at for no TX on 2m. Here is my channel video: ?
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In this video, I review the schematic from the TX predrivers, PA finals and into the RF filtering to the antenna. Alas, most of the components will sit on the underside of the RF filter board, so you would need to pull the board out. And when out of the rig, there is no easy way to test the radio, so you will have to revert to basic diode testing of the diodes or transistors that could be affected, but this is straightforward with a multimeter diode test function: test the diode/transistor junctions wiht leads one way, then reverse the leads and retest. You can expect 0.7V(ish) in the conducting direction and 'OL' in the other. Anything else and it makes one suspect the diode/transistor is faulty.
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Schematics are found on the internet - I use ? ?For an early FT817 (early LOT numbers), go to page 71 for the relevant schematic page, and p. 73/74 for the physical board layout drawings. There were some very modest changes in components in later versions (changes from resistors to inductors in the RX path for example), nothing significant in 2m troubleshooting. Look here to identify your LOT number as the schematics (different pages in the pdf above) to change:
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Before pulling the board out: confirm the rig RX on 2m with no issues - this helps narrow the issue to TX related control voltages, and RF TX path switching via relays. If there also no RX on 2m, the issue could also then be in the LPF and HPF circuits with an open or short/low impedance path to ground.
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Good luck and let us know how it goes.
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73 de Matt, M0NJX
Westerham, Kent, England.
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Re: TX ERR on 40m from .101 to .200
After some considerable searching I couldn't find any reference, but Geert's comments on
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are helpful. Resetting the radio post mod. seems to be a general requirement. Personally I ignore ARS due to the different in band offsets and directions that are required over here on UHF.
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Back to the thread then- apologies.
--
Steve, G4VRR.
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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.
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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.
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HI
I'm using my FT-817 with cat in the QLOG log (Linux version).
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Does anyone use it? Did you manage to configure the CW?
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73 de PY2ZA jr?
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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"
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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 ...
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Steve, G4VRR.
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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”
No. Nice try, though.
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Re: TX ERR on 40m from .101 to .200
This mod should get you aligned with the US band plan?
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Good luck,
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tom
kj5dyu
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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?
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 ?
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Ben.?
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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.
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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.?
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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.
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FT817 over-currents in tx on 18Mhz (17m) and 21Mhz (15m) - any ideas?
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.?
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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.?
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This suggests the issue is the balun itself or after the balun in the RF filtering stages.?
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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'.
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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.
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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.?
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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?
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Any ideas or suggestions are greatly appreciated,?
73 de
Matt Nassau, M0NJX
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Re: Ft817 shuts off at 10 volts?
The Windcamp battery also works below 10v.
Or, it's tired. May need a new one.
Mike WA1MAD
On Sun, Jan 26, 2025, 11:25?AM Albert Marsh via <hitekgearhead= [email protected]> 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.
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-Albert
KI4ORI
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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
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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.
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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= [email protected]> 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.
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-Albert
KI4ORI
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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.
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-Albert
KI4ORI
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Tobias KK7BCO/2M0TFF
Steve
Tom Walker