ah ok.
So a typical meter doesn't reference a certain voltage or current to ground
usually?
73
Colin, V A6BKX
----- Original Message -----
From: "Steve Dresser" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, March 18, 2008 9:34 AM
Subject: Re: tone osilator.
> Colin,
>
> That only works if one side of the meter operates at ground potential, but
> not of both sides of the meter are above ground, which is usually the
case.
> Besides, I don't think you want voltage from the key circuit on the same
> jack as your oscillator because of stray capacitance that might be
> introduced in the jack.
>
> Steve
>
> ----- Original Message -----
> From: "Colin McDonald" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Tuesday, March 18, 2008 10:18
> Subject: Re: tone oscillator.
>
>
> > that could work yep.
> > I think the straight key jack is a regular phone jack, meaning it has
just
> > the tip and sleeve connections.
> > If a person were to replace that jack with a TRS jack, with the extra
ring
> > connection, you could easily use the sleeve and ring for the tone
> > oscillator
> > and allow the sleeve and tip to remain the CW key circuit.
> > I think the use of a diode in either the tone oscillator circuit or the
cw
> > key circuit to prevent any ground loops might be wize as well.
> > Though i'm not sure how that would work.
> > 73
> > Colin, V A6BKX
> > ----- Original Message -----
> > From: "Shaun Oliver" <[log in to unmask]>
> > To: <[log in to unmask]>
> > Sent: Tuesday, March 18, 2008 8:03 AM
> > Subject: Re: tone oscillator.
> >
> >
> >> perhaps without drilling holes in teh rig one could modify the morse
key
> >> jack to provide power for such a device?
> >>
> >>
> >> On 19/03/2008 12:37 AM, the old scribe known as Martin McCormick was
> >> able to impart this pearl of wisdom:
> >> > One thing I saw on an old Heath Kit Warier linear which
> >> > had been outfitted with an audio tuning device was a
> >> > quarter-inch stereo headphone jack on the rear of the chassis.
> >> > Somebody had run coax designed for balanced audio service from
> >> > the stereo jack to the two contacts of the meter on the front
> >> > pannel.
> >> >
> >> > This would be a good way to do the modification.
> >> >
> >> > Balanced-line audio coax has 3 conductors. There is the
> >> > shield plus two center wires instead of 1. One would want to
> >> > route it so that it is as far away from the high-power RF
> >> > circuitry as possible so one doesn't induce RFI in to the
> >> > tone oscillator or the meter, itself.
> >> >
> >> > It is likely that both sides of the meter are above
> >> > ground, hince the balanced coax.
> >> >
> >> > Of course two runs of regular coax would also work.
> >> >
> >> > Martin McCormick WB5AGZ Stillwater, OK
> >> > Systems Engineer
> >> > OSU Information Technology Department Network Operations Group
> >> > Walt Sebastian writes:
> >> >> Hi Shaun,
> >> >> It seems to me, back in the olden days when I had a Kenwood TS520, I
> > could
> >> >> go about 50 to 60 KHz before I tuned up. I am sure other people
> >> >> tuned
> > up
> >> >> sooner than that.
> >> >>
> >> >> Walt
> >> >> WA4QXT
> >> >> New London CT
> >> >> [log in to unmask]
> >> >>
> >> >
> >> >
> >> > __________ NOD32 2956 (20080318) Information __________
> >> >
> >> > This message was checked by NOD32 antivirus system.
> >> > http://www.eset.com
> >> >
> >> >
> >> >
> >>
> >>
> >>
> >> --
> >> No virus found in this incoming message.
> >> Checked by AVG.
> >> Version: 7.5.519 / Virus Database: 269.21.7/1332 - Release Date:
> >> 3/17/2008
> > 10:48 AM
> >>
> >>
> >
> >
> >
> >
>
>
>
> --
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> Checked by AVG.
> Version: 7.5.519 / Virus Database: 269.21.7/1333 - Release Date: 3/18/2008
8:10 AM
>
>
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