[AMRadio] Tansmitter power reduction (Ranger)


Bob Macklin macklinbob at msn.com
Thu Nov 17 15:12:28 EST 2005


But the LV rectifier may not be able to handle the additional load. Maybe
you could connect the HV rectifier to the LV taps.

In the 60's I used a Heath HX-20 (SSB Tx) with a 2E26 in place of the 6146
to drive a 2M transverter. I used 300VDC for the HV for the 2E26.

Bob Macklin
K5MYJ
Seattle, Wa.
----- Original Message ----- 
From: "Mike Dorworth, K4XM" <k4xm at arczip.com>
To: "Discussion of AM Radio" <amradio at mailman.qth.net>
Sent: Thursday, November 17, 2005 11:15 AM
Subject: Re: [AMRadio] Tansmitter power reduction (Ranger)


> The way the secondary is wound all the final and lv passes through the
> winding so you would have TWICE as much  current if you use just the low
> voltage taps. BTW the Ranger modulation transformer is (by my measurement)
> 7083.8 ohms plate to plate primary, 3568 ohms centertaped (892 ohms each
> side) secondary.   or 1.9837 z stepdown, 1.4085 step down turns ratio.
> Nominal 7000 to 3500 ohms. About 15 watts Audio level, used at 32.5 watts
> ICAS voice.  Hope this is helpfull. 73, Mike
> ----- Original Message -----
> From: "John Lawson" <jpl15 at panix.com>
> To: "Discussion of AM Radio" <amradio at mailman.qth.net>
> Sent: Wednesday, November 16, 2005 10:11 PM
> Subject: [AMRadio] Tansmitter power reduction (Ranger)
>
>
> >
> >
> > On Wed, 16 Nov 2005, John Coleman ARS WA5BXO wrote:
> >
> > > I don't know if the power supply come from the same XFMR or not but
what
> > > does "10 on the knob" mean?
> >
> >
> >   In the Ranger, the LV feed to it's rectifier is from two equidistant
> taps
> > between CT and the 'ends' of the HV secondary, the which ends feed the
HV
> > rectifier.  I'm a bit worried that if I run the whole radio on the LV
> > winding, it will stress it. If anyone has any concrete "real-world"
actual
> > experience with doing this, I'd love to hear how it worked out.
> >
> >    Guitar (and other musical) amplifiers traditionally have their volume
> > knobs marked 0 - 10, thus '10' is 'loudest'.  From whence derives the
joke
> > in Spinal Tap - "This amp was custom made for me - see? the knobs all go
> > to *11*!!!"
> >
> >   Cheers
> > John  KB6SCO
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