[AMRadio] AMRadio] Source Broadcast Xmtrs


Dennis Gilliam dennisgilliam at gmail.com
Mon Jun 13 15:54:12 EDT 2011


Efficiency really doesn't apply to those of us running half-century-old
rigs, or we would all be running SS class 'E'.

Gimme' big, glass tubed, humming boxes where I can SEE the tubes doing their
thing.

73DG

On Mon, Jun 13, 2011 at 12:46 PM, Jim Tonne <Tonne at comcast.net> wrote:

>
> >   Only rub I see is: I don't think most 250 Watt BC transmitters can
> > make full amateur power.  (which many want)
>
> There is another subtle thing with those tube-type 250-watt BC
> transmitters.   They were usually of the 810s modulated by 810s
> style.   And that kind of rig wasn't as efficient as later designs
> using tetrodes.  Bottom line, and an example:   The Raytheon
> RA-250 had a maximum draw from the power line of 2700
> watts.   I suppose it would be less when running and with no
> nodulation.   But you had to have a powerline capable of
> delivering 2700 watts.
>
> - Jim W4ENE
>
>
>
>
>
>
>
>
>
>
> ----- Original Message -----
> From: "Ron Youvan" <ka4inm at tampabay.rr.com>
> To: "Discussion of AM Radio in the Amateur Service"
> <amradio at mailman.qth.net>
> Sent: Monday, June 13, 2011 3:26 PM
> Subject: Re: [AMRadio] AMRadio] Source Broadcast Xmtrs
>
>
> > Dennis Gilliam wrote:
> >
> >> Or even the rare Gates 250T.  Not much prettier, that 'T' cabinet style.
> >
> >   Only rub I see is: I don't think most 250 Watt BC transmitters can
> > make full amateur power.  (which many want)
> > --
> >    Ron  KA4INM -   Every HAM should have at least one desk MIC,
> >                    it's the perfect place to hang the cans when
> >                    CW is "arm chair copy."
> > ______________________________________________________________
> > Our Main Website: http://www.amfone.net
> > AMRadio mailing list
> > Searchable Archives:
> http://www.mail-archive.com/amradio@mailman.qth.net/
> > List Rules (must read!): http://w5ami.net/amradiofaq.html
> > List Home: http://mailman.qth.net/mailman/listinfo/amradio
> > Post: AMRadio at mailman.qth.net
> > To unsubscribe, send an email to amradio-request at mailman.qth.net with
> > the word unsubscribe in the message body.
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Our Main Website: http://www.amfone.net
> AMRadio mailing list
> Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/
> List Rules (must read!): http://w5ami.net/amradiofaq.html
> List Home: http://mailman.qth.net/mailman/listinfo/amradio
> Post: AMRadio at mailman.qth.net
> To unsubscribe, send an email to amradio-request at mailman.qth.net with
> the word unsubscribe in the message body.
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>


More information about the AMRadio mailing list

This page last updated 17 Jan 2018.