Keith, when I bought a big marine battery, a booklet came with it. It said
the battery could be considered fully discharged if the no-load voltage was
12.0 volts. Here is what the chart said:
12.0 volts = fully discharged
12.2 volts = 1/4 charge
12.4 volts = 1/2 charge
12.6 volts = 3/4 charge
12.8 volts = full charge
Before measuring the voltage, the battery must be allowed to sit with no
charging or load for about an hour.
Now, consider that you are operating with a dead battery and couple that
with the losses in the power cables to the rig and you may be down even
lower on the actual 'supply' voltage to the rig, which is designed to
operate from 13.8 volts or so.
Just charging the battery may help you greatly!
Regards,
Mike N4NT@wireco.net
Johnson City, Tennessee
----- Original Message -----
From: K & H Darwin <darwin@together.net>
To: TenTec List <tentec@contesting.com>
Sent: Monday, October 18, 1999 6:22 PM
Subject: Re: [TenTec] Omni C FMs on Tx.
>
> I just did some more testing. The VFO jumper on the back is tight and
> clean.
>
> Battery voltage is 12.1 VDC. As I bring the drive up, it drops to 11.7
VDC
> and the frequency shifts. I then connected my battery charger and
repeated
> the test. This time, the battery started at 12.4 VDC and dropped to 11.9
> VDC. The frequency shift occurred at the same output power level (a bit
> less than 50 watts) rather than the same battery voltage level.
>
> I then connected a ground wire from my rig to my tuner and repeated the
> test. Same results.
>
> I get the same results with an antenna or a dummy load. Any drive level
> over about 40 watts out caused frequency to decrease.
>
> Keith "idon'tlikethiskindastuff" Darwin
> KD1E
> Ferrisburg, VT
>
> ----------
> > From: Tim Cook <timcook@erinet.com>
> > Subject: Re: [TenTec] Omni C FMs on Tx.
>
> > First I would check to be sure the battery is holding its voltage under
> > load.
> > If you keep the ALC
> > control fully counterclockwise and then bring up the drive to where the
> ALC
> > light comes on does it still do it? That should give you about 25-35
> watts
> > out with the alc counterclockwise. The battery might hold ok at that
> power
> > out. It's worth a try
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