[AMRadio] AMRadio] Source Broadcast Xmtrs


W2XJ w2xj at nyc.rr.com
Mon Jun 13 16:07:17 EDT 2011


Since the FCC changed the rules regarding power, efficiency is not 
really that important so long as one can pay for the power and 
replacement tubes.

On 6/13/11 3:54 PM, Dennis Gilliam wrote:
> 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
>>
> ______________________________________________________________
> 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.