Re: Qrp-labs and a Huff and Puff circuit board
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Hahaha yeah Bill you're right.? But did you notice my callsign?? A PTO is a new game for the kid after all the vxo stuff gets old.
Joe -VE3VXO
Hi Joe,
If you are concerned about current drain, drift, AND phase noise you
might consider a VXO. Obviously it won't tune from DC to daylight. So
many choices, -sigh-
73,
Bill? KU8H
On 4/6/19 7:03 PM, Joe Street wrote:
> Hi Allison
>
> All good points, however consider in the context, this is a PTO I am
> building for my Norcal 2030, a rig which has phenomenal dynamic range
> and large close in signal handling while sipping only 11mA of current
> from 12 volts!? Such an energy efficient design with such stellar
> performance begs to be taken out on field day, maybe somewhere far away
> where weight and battery life are important.? I wouldn't want to ruin
> the power efficiency with any kind of synth.? Also the phase noise of
> the PTO will be better than a synth and phase noise of the local
> oscillator is a factor in the large signal performance.? I'm trying to
> make this rig suitable for a changing temperature environment without
> ruining it.? I looked at fast huffnpuffs but fear these will have a
> negative affect on phase noise so I am now only considering the type
> that make a small correction no more frequently than a few times per
> second.? I hope I can make it work and not add more than a few mA to the
> overall current draw.? I will make it so it can be turned off as well if
> need be.
>
> Joe ve3vxo
>
> On Sat, Apr 6, 2019 at 6:23 PM ajparent1/KB1GMX <kb1gmx@...
> <mailto:kb1gmx@...>> wrote:
>
>? ? ?Generally with PTO radios of the tentec and Drake realm if the PTO
>? ? ?is drifting something
>? ? ?isn't right.? I start there.
>
>? ? ?Exceptions are Swan and Atlas plus a few older Tentec like the
>? ? ?Argonaut 505 and 509 as
>? ? ?they use a fairly high frequency PTO for some bands.? It doesn't
>? ? ?solve the problem of
>? ? ?dial calibration or drifting for narrow modes like JT8 or even PSK31.
>
>? ? ?Rather than going the huff&puff I just drop in a DDS or 5351 and
>? ? ?kill the problem cold.
>? ? ?The only one I've resorted to for that is one junker level Atlas 210
>? ? ?and that vfo was
>? ? ?not savable due to 11M mods the rig was subjected to.
>
>? ? ?Allison
>
>
--
bark less - wag more
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