on the topic of autotuners

[Julius Fazekas n2wn]

Steve,

I agree, the bypass would be a welcome addition. I'd
also like to see a meter. It's nice to see power out
and SWR. LEDs are fine, but a meter is a more powerful
tool IMHO.(OK, Digital readout may be acceptable, but
not as instantaneous as a meter).
Cheers,
Julius
n2wn
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[n6wg]

I wonder whether a simple phono connector on the rear of the rig
or ATU wouldn't give access to an alalog voltage line.  It could be used
with an external meter for tuning indications.
Calibration would still be a question, I suppose.
73, Bob N6WG

> Steve,
>
> I agree, the bypass would be a welcome addition. I'd
> also like to see a meter. It's nice to see power out
> and SWR. LEDs are fine, but a meter is a more powerful
> tool IMHO.(OK, Digital readout may be acceptable, but
> not as instantaneous as a meter).
> Cheers,
> Julius
> n2wn
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[Julius Fazekas n2wn]

Bob,
That's a good point. I suppose if you knew that 100W
should provide say 100 uA, you could use a Bird 43 to
develop a scale for the meter. Maybe moving the KAT
into an EC2, finding a meter that fits the front panel
would accomplish this in a neat package.
73,
Julius
n2wn

--- [hidden email] wrote:

> I wonder whether a simple phono connector on the
> rear of the rig
> or ATU wouldn't give access to an alalog voltage
> line.  It could be used
> with an external meter for tuning indications.
> Calibration would still be a question, I suppose.
> 73, Bob N6WG
>
>
> > Steve,
> >
> > I agree, the bypass would be a welcome addition.
> I'd
> > also like to see a meter. It's nice to see power
> out
> > and SWR. LEDs are fine, but a meter is a more
> powerful
> > tool IMHO.(OK, Digital readout may be acceptable,
> but
> > not as instantaneous as a meter).
> > Cheers,
> > Julius
> > n2wn
> > _______________________________________________
> > Elecraft mailing list
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>

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[n6wg]

I would suppose that a simple pot would allow one to
calibrate to 100 uA, assuming the source could provide at
least that much current.  I'm always looking for the simplest
solution possible.  I hate complexity for complixity's sake :-)
73, Bob N6WG

-------------- Original message --------------

> Bob,
> That's a good point. I suppose if you knew that 100W
> should provide say 100 uA, you could use a Bird 43 to
> develop a scale for the meter. Maybe moving the KAT
> into an EC2, finding a meter that fits the front panel
> would accomplish this in a neat package.
> 73,
> Julius
> n2wn
>
> --- [hidden email] wrote:
>
> > I wonder whether a simple phono connector on the
> > rear of the rig
> > or ATU wouldn't give access to an alalog voltage
> > line. It could be used
> > with an external meter for tuning indications.
> > Calibration would still be a question, I suppose.
> > 73, Bob N6WG
> >
> >
> > > Steve,
> > >
> > > I agree, the bypass would be a welcome addition.
> > I'd
> > > also like to see a meter. It's nice to see power
> > out
> > > and SWR. LEDs are fine, but a meter is a more
> > powerful
> > > tool IMHO.(OK, Digital readout may be acceptable,
> > but
> > > not as instantaneous as a meter).
> > > Cheers,
> > > Julius
> > > n2wn
> > > _______________________________________________
> > > Elecraft mailing list
> > > Post to: [hidden email]
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> >
> > >
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> > > Elecraft web page: http://www.elecraft.com 
> >
>

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[Julius Fazekas n2wn]

Bob,
It's worth looking at when I have a spare moment...
You definitely wouldn't enjoy working for the National
Lab system, simple does not exist in this world!
Cheers,
Julius
n2wn
--- [hidden email] wrote:

> I would suppose that a simple pot would allow one to
> calibrate to 100 uA, assuming the source could
> provide at
> least that much current.  I'm always looking for the
> simplest
> solution possible.  I hate complexity for
> complixity's sake :-)
> 73, Bob N6WG
>
> -------------- Original message --------------
>
> > Bob,
> > That's a good point. I suppose if you knew that
> 100W
> > should provide say 100 uA, you could use a Bird 43
> to
> > develop a scale for the meter. Maybe moving the
> KAT
> > into an EC2, finding a meter that fits the front
> panel
> > would accomplish this in a neat package.
> > 73,
> > Julius
> > n2wn
> >
> > --- [hidden email] wrote:
> >
> > > I wonder whether a simple phono connector on the
>
> > > rear of the rig
> > > or ATU wouldn't give access to an alalog voltage
>
> > > line. It could be used
> > > with an external meter for tuning indications.
> > > Calibration would still be a question, I
> suppose.
> > > 73, Bob N6WG
> > >
> > >
> > > > Steve,
> > > >
> > > > I agree, the bypass would be a welcome
> addition.
> > > I'd
> > > > also like to see a meter. It's nice to see
> power
> > > out
> > > > and SWR. LEDs are fine, but a meter is a more
> > > powerful
> > > > tool IMHO.(OK, Digital readout may be
> acceptable,
> > > but
> > > > not as instantaneous as a meter).
> > > > Cheers,
> > > > Julius
> > > > n2wn
> > > >
> _______________________________________________
> > > > Elecraft mailing list
> > > > Post to: [hidden email]
> > > > You must be a subscriber to post to the list.
> > > > Subscriber Info (Addr. Change, sub, unsub
> etc.):
> > > >
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> > >
> > > >
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> > > > Elecraft web page: http://www.elecraft.com 
> > >
> >

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[Geoffrey Mackenzie-Kennedy-2]

Hi Julius,
Thanks for the fill in. I still have not received the early postings hmmmm.
Strange, I just sent Eric and Wayne a wish for the >KAT100 and that is for a
"Silent" antenna coupler that does not require watts to be radiated during
tune, but only a few milliwatts. It would provide "for free" a dummy load,
not only for testing but also a "default" load for the TX when the antenna
falls down. Like you I would much prefer a meter, I do not like the LEDs at
all as a VSWR indicator to be honest. Fine for "status" indicators.Ability
to bypass coupler, Yes.
CU off list re antennas.
73,
Geoff.
GM4ESD



> 'ello Geoff,
> We're discussing the "wish list" for an updated
> KAT100, or modifying the current version. I show my
> advanced decrepitude by waxing philosophically about
> adding a power out/SWR METER. LEDs are fine, but I
> just prefer a meter!

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[Julius Fazekas n2wn]

Hi Geoff,

I'd add one more option/possibility: one suitable for
remote (at the antenna) mounting.
Keep the kit form option. It's a very easy build.
cheers,
Julius
n2wn

--- Geoffrey Mackenzie-Kennedy
<[hidden email]> wrote:

> Hi Julius,
> Thanks for the fill in. I still have not received
> the early postings hmmmm.
> Strange, I just sent Eric and Wayne a wish for the
> >KAT100 and that is for a
> "Silent" antenna coupler that does not require watts
> to be radiated during
> tune, but only a few milliwatts. It would provide
> "for free" a dummy load,
> not only for testing but also a "default" load for
> the TX when the antenna
> falls down. Like you I would much prefer a meter, I
> do not like the LEDs at
> all as a VSWR indicator to be honest. Fine for
> "status" indicators.Ability
> to bypass coupler, Yes.
> CU off list re antennas.
> 73,
> Geoff.
> GM4ESD
>
>
>
> > 'ello Geoff,
> > We're discussing the "wish list" for an updated
> > KAT100, or modifying the current version. I show
> my
> > advanced decrepitude by waxing philosophically
> about
> > adding a power out/SWR METER. LEDs are fine, but I
> > just prefer a meter!
>
>

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[Stuart Rohre]

One of the issues in the operation of an auto tuner, is that it has to
transmit enough power to be rectified by silicon diodes detecting and
operating in a linear manner.  Also, you have to transmit enough power to
break down the oxides on connectors, RF switches, antenna connections and
anything else in the Antenna circuit before you get enough conduction to
look like the higher transmitter power action on the Antenna circuit.

Thus, there is a lower limit on the detection and effectiveness of the RF
source used to tune the antenna tuner while making the changes in tuner
adjustment easily detected and not too "touchy".  The ideal is to have
enough power used that you have a nice peak to the detected signal, and a
smooth slope up and down around it for the peak detection to work well.

-Stuart
K5KVH


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