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DR-2X Failure to Switch to DC

 

Our DR-2X repeater failed to switch to DC today when we had a power failure.?

Red “DC” light is on but repeater is dead. It is connected to a 12v 390 ah automotive battery.?

Any ideas?
 

Oh, it probably did, then when power came back, the supply in the Yaesu Crow-bared or whatever it does.?? It's a common problem.?? I don't know the fix, other than don't let the Yaesu attempt to charge it.

Oh, disconnect the battery, and remove power for a minute.?? Your Yaesu will come back to life when you reapply power.

Andy
WJ9J


On Fri, Jan 3, 2025 at 3:29?PM Bill Davis AE via <kg5ie=[email protected]> wrote:
Our DR-2X repeater failed to switch to DC today when we had a power failure.?

Red “DC” light is on but repeater is dead. It is connected to a 12v 390 ah automotive battery.?

Any ideas?
 

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There is a micro fuse in the Yaesu supply that enables charging the battery. ?If the battery is very dead when the AC power restores there is a good probability that the fuse blew. You can open the case and check the fuse, OR put a battery on the repeater with an external charger and forgo the AC input.?

Jim
WA2RJP
Sent by me


On Jan 3, 2025, at 15:29, Bill Davis AE via groups.io <kg5ie@...> wrote:

?
Our DR-2X repeater failed to switch to DC today when we had a power failure.?

Red “DC” light is on but repeater is dead. It is connected to a 12v 390 ah automotive battery.?

Any ideas?
 

I've tested my DR-2X for battery switch over but have never left it connected for actual battery backup. Like any other repeater here I would use a 120VAC coil relay to disconnect the battery during normal use then when power fails the relay will connect the battery. I would also use a separate charger for the backup battery which will of course will be out of circuit during a power failure.?
 

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The two DR-2X that we own say that you can’t recharge the battery from the repeater. It says you need an external regulated charger to recharge the battery.?

On Jan 3, 2025, at 4:08?PM, Mike via groups.io <prcradio@...> wrote:

?
I've tested my DR-2X for battery switch over but have never left it connected for actual battery backup. Like any other repeater here I would use a 120VAC coil relay to disconnect the battery during normal use then when power fails the relay will connect the battery. I would also use a separate charger for the backup battery which will of course will be out of circuit during a power failure.?
 

While I like your idea of operating a battery and forgoing the AC all together, that would limit the output power to 20 watts.?
 

I’ll check to see if the battery is under the required voltage.?

I have a battery tender from a motorcycle I no longer own. Guess I’ll add that to trickle the backup battery.?
 

Jim,
?
You might know off the top of your head, in reference to the F6001 (1 amp ) fuse. If you were to pull this fuse from the circuit, #1 it should "disconnect" the internal battery charger circuit output and #2 will it have any effect operational wise on the repeater??
?
As many of us know don't let the repeater charge LifePo4 batteries, my thought was and I can not find anything anywhere really on this, use an external charger on a 120VAC coil for on/off states, with this fuse removed, it should eliminate the internal charger and I do not see any reason it would have any negative performance results to the repeater itself.?
?
?
Next Question on this line, has anyone heard of anyone complaining about RFI/EMI noise issues (transmitted over the air like a hum or whine) charging the battery with an external charger, during repeater normal VAC operations? I know HF world some power supplies can cause a whine/squeal/hum to be transmitted.
?
This will be our first (two of them) Yaesu repeaters, and just trying to get some facts to get them ready to go on the air soon.
?
Thanks
Kory
W4RZ
 

See post 211955, if you break the DC lines with a high current 120VAC relay then you don’t have to remove any fuse or worry about the charger inducing noise. The battery will charge when AC is present and will be isolated from the repeater then will connect the battery when AC fails.?
 

Does the repeater still work on AC supply?

I ask because there's another failure condition which requires power cycling the RX and TX chassis's with a external FTM-400 control head. I had one on the shelf for months that wouldn't power up and that was the simple fix. Unfortunately no power button populated on the internal pair of FTM-400 control head boards used to drive the repeater's front panel.

Jeremy. K1LFK


On Wed, Apr 2, 2025, 9:49?AM Mike via <prcradio=[email protected]> wrote:
See post 211955, if you break the DC lines with a high current 120VAC relay then you don’t have to remove any fuse or worry about the charger inducing noise. The battery will charge when AC is present and will be isolated from the repeater then will connect the battery when AC fails.?
 

Yes Mike pulled me head out of my rear end with his answer.
?
The 120VAC coil would go between battery output and the repeater (either plug or hard wire config on your repeater), all it is doing is not letting the charging current to enter the repeater. If you lose AC Mains, he relay drops out about as fast as the system tries to swap to backup and you never notice anything. It has no effect on normal use, plugged into a wall outlet.
?
Kory

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