[AMRadio] Low Power AM?


Bob Macklin macklinbob at msn.com
Sun Nov 23 16:17:10 EST 2008


The Heath instructions for the DX-60 specifically state that for Novice
operation to only increase the loading to 100ma for Novice operation (75W)
or to 150ma for normal (full power) operation.

Bob
K5MYJ
----- Original Message ----- 
From: "rbethman" <rbethman at comcast.net>
To: "Discussion of AM Radio in the Amateur Service"
<amradio at mailman.qth.net>
Sent: Sunday, November 23, 2008 1:08 PM
Subject: Re: [AMRadio] Low Power AM?


> Bob,
>
> I'm NOT Pete.  He may feel insulted.  LOL
>
> You're using a PI network, NOT a link tuned system.  If you reduce
> loading, AND maintain plate dip, You will indeed reduse output AND go
> NON-RESONANT.
>
> This opens a whole other can of worms.
>
> Bob - N0DGN
>
> Bob Macklin wrote:
> > No Pete,
> >
> > I am saying to reduce the load capacitor and maintain the dip on the
plate
> > capacitor.
> >
> > It's the same as reducing the coupling on a link coupled final.
> >
> > Bob
> > K5MYJ
> > ----- Original Message ----- 
> > From: "rbethman" <rbethman at comcast.net>
> > To: "Discussion of AM Radio in the Amateur Service"
> > <amradio at mailman.qth.net>
> > Sent: Sunday, November 23, 2008 12:48 PM
> > Subject: Re: [AMRadio] Low Power AM?
> >
> >
> >
> >> Bob,
> >>
> >> While the plate transformer may well handle that, you are tuning off
> >> resonance of the PI network.  That results in tuning off the Plate dip.
> >> I would NOT imagine that this concept would do the 6146s any good at
all.
> >>
> >> I would suspect that a reduction of Drive would be wiser.
> >>
> >> Bob - NoDGN
> >>
> >> Bob Macklin wrote:
> >>
> >>> Can't you just run at reduced input by reducing the loading? Then run
> >>>
> > the
> >
> >>> tube(s) at the CCS rating. The power transformer should take that.
> >>>
> >>> Bob
> >>> K5MYJ
> >>> ----- Original Message ----- 
> >>> From: "rbethman" <rbethman at comcast.net>
> >>> To: "Discussion of AM Radio in the Amateur Service"
> >>> <amradio at mailman.qth.net>
> >>> Sent: Sunday, November 23, 2008 12:14 PM
> >>> Subject: Re: [AMRadio] Low Power AM?
> >>>
> >>>
> >>>
> >>>
> >>>> George,
> >>>>
> >>>> Good question!  There is NO mention of RTTY operation ANYWHERE in the
> >>>> Apache Manual.
> >>>>
> >>>> I'm also not sure how you can safely reduce the power out put
following
> >>>> the tuning procedures, WITHOUT doing some damage to some components.
> >>>>
> >>>> It does just fine on AM and CW.  Mixed results on SSB with the SB-10.
> >>>>
> >>>> Bob - N0DGN
> >>>>
> >>>>
> >> -- 
> >> Bob - NØDGN
> >>
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>
> -- 
> Bob - NØDGN
>
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