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LO BATT

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Manuel Wilches

LO BATT

Hello Elecrafters!
I have just finished building my new KAT100 and the XG2 . They both work
very well indeed.

I am using a K2/100 (serial 5310) with a regular power supply off 220 volts
and, occasionally, in the middle of my CW transmissions, the "Lo Batt"
message pops up on the display (beep included). The K2 carrys on keying.

I thought this would only appear if you were using a battery of some kind
with low voltage delivery. Could this be an indication that my power supply
is developing a problem?

Example:
I am on 24910 CW.
On standby my K2/100 indicates: 13.0 V and 0.52
On transmit it indicates: +/- 10.0 V. and 2.34

A comment would be very much appreciated.
73
Manuel
LU5OM
CT4IK

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Tom Zeltwanger

Re: LO BATT

If the input DC voltage to the K2 is too low, it will say LO BATT (for battery
or external supply). I got the same message when I was using a power supply
that was putting out too little voltage. The manual tells you the acceptable
range, but your power supply should not drop to 10 volts.

Others here will have more detailed info they can provide.

73,

Tom KG3V

Quoting Manuel Wilches <[hidden email]>:

> Hello Elecrafters!
> I have just finished building my new KAT100 and the XG2 . They both work
> very well indeed.
>
> I am using a K2/100 (serial 5310) with a regular power supply off 220 volts
> and, occasionally, in the middle of my CW transmissions, the "Lo Batt"
> message pops up on the display (beep included). The K2 carrys on keying.
>
> I thought this would only appear if you were using a battery of some kind
> with low voltage delivery. Could this be an indication that my power supply
> is developing a problem?
>
> Example:
> I am on 24910 CW.
> On standby my K2/100 indicates: 13.0 V and 0.52
> On transmit it indicates: +/- 10.0 V. and 2.34
>
> A comment would be very much appreciated.
> 73
> Manuel
> LU5OM
> CT4IK
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>

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Don Wilhelm-3

RE: LO BATT

In reply to this post by Manuel Wilches

Manuel,

Strange LO BATT messages usually occur if the jumper on Control Board P7 is
set to the EXT position. It should be set to the INT position for correct
readings of the internal K2 voltage and current.

Those with older K2s may remember this well, there was a switch that was
easily bumped into the wrong position instead of the jumper in the post SN
3000 K2s.

If your switch IS in the correct position, check your power supply wire and
its connections to see where the voltage is dropping significantly.

73,
Don W3FPR

> -----Original Message-----

> Hello Elecrafters!
> I have just finished building my new KAT100 and the XG2 . They both work
> very well indeed.
>
> I am using a K2/100 (serial 5310) with a regular power supply off
> 220 volts
> and, occasionally, in the middle of my CW transmissions, the "Lo Batt"
> message pops up on the display (beep included). The K2 carrys on keying.
>
> I thought this would only appear if you were using a battery of some kind
> with low voltage delivery. Could this be an indication that my
> power supply
> is developing a problem?
>
>

--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.446 / Virus Database: 268.18.4/705 - Release Date: 2/27/2007
3:24 PM

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Tom Zeltwanger

RE: LO BATT

Don,

Guess I better check my setup. I definitely was using an external supply, got
the LO BATT message, and verified that my power supply was way under requried
voltage level. I guess from your note that I may have the switch in the wrong
position.

Tom

Quoting Don Wilhelm <[hidden email]>:

> Manuel,
>
> Strange LO BATT messages usually occur if the jumper on Control Board P7 is
> set to the EXT position. It should be set to the INT position for correct
> readings of the internal K2 voltage and current.
>
> Those with older K2s may remember this well, there was a switch that was
> easily bumped into the wrong position instead of the jumper in the post SN
> 3000 K2s.
>
> If your switch IS in the correct position, check your power supply wire and
> its connections to see where the voltage is dropping significantly.
>
> 73,
> Don W3FPR
>
> > -----Original Message-----
>
> > Hello Elecrafters!
> > I have just finished building my new KAT100 and the XG2 . They both work
> > very well indeed.
> >
> > I am using a K2/100 (serial 5310) with a regular power supply off
> > 220 volts
> > and, occasionally, in the middle of my CW transmissions, the "Lo Batt"
> > message pops up on the display (beep included). The K2 carrys on keying.
> >
> > I thought this would only appear if you were using a battery of some kind
> > with low voltage delivery. Could this be an indication that my
> > power supply
> > is developing a problem?
> >
> >
> --
> No virus found in this outgoing message.
> Checked by AVG Free Edition.
> Version: 7.5.446 / Virus Database: 268.18.4/705 - Release Date: 2/27/2007
> 3:24 PM
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>

Manuel Wilches

Re: LO BATT

In reply to this post by Manuel Wilches

Many thanks for the generous comments and suggestions.

I believe the cables to the power supply were a bit loose. The situation improved quite a bit: 13.1 v o 11.6 v on the K2 display. The jumper on the control board is on the INT position. I did not change it.

If I put a DMM at the power supply terminals I read: 13.6 v and then 12.6 v on transmit. The RF reading on the K2 display reaches full scale when I transmit.

Are these voltage drops reasonable ? Thank you.

73
Manuel
LU5OM
CT4IK
K2/100 # 5310

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