[AMRadio] AM worldwide

[Bill Guyger]

IIRC the ART13 uses a combination of Plate and Screen modulation. It gives a solid 100% on positive peaks and 99% or so on negative peaks (wouldn't want to go all the way to 100% negative would we?)  It's a Collins design after all.....

Bill AD5OL 

Sent from my iPhone

> On Aug 24, 2018, at 7:24 PM, ARS W5OMR <ars.w5omr at gmail.com> wrote:
> 
> Just a point of contention ...
> There's a huge difference in an ART-13 and some gutless wonder solid state
> rig.
> The ART-13 has Class C, plare modulated funal, whereas the solid state rig
> is anything 'but' plate modulated.
> In the latter, if your final is capable of producing 100w in the output
> stage, the ~20% of that is your carrier, and the other 80% is required to
> cleanly modulate that 20 or so watts to 100%.
> If The plate modulated rig runs 100w of carrier, then the PEP output,
> generally speaking, would be around 400w.
> 
> 40w from a solid state rig running a 100w final will burn that final up in
> a hurry.
> 
> I run a Ten-Tec solid state SDR rig these days (still have the homebrew
> 250TH' x 250TH's - just no time and no space to get it back on the air) and
> I run the Trn-Tec into a Drake L-7 amp - pair of 3-500z's - exciting the
> final with about 12 or 13w to get ~150/175w out. I have run as much as 200w
> out but the tubes start showing color. The dissipation level is high on
> those tubes in linear AM mode.
> 
> 73 de W5OMR
> 
> 
> On Fri, Aug 24, 2018, 08:03 Daniel Artaud F6BRD via AMRadio <
> amradio at mailman.qth.net> wrote:
> 
>> Rob,
>> 
>> No, they don't, They are too serious for that HI!...
>> I love AM because it is the way I descovered Ham Radio in 1966 when my
>> parents put the radio in the attic. This lent me to have a job in the
>> TV/Radio broadcast industry during 42 years. It was a pleasure to work
>> or to get close up with "Beasts" in VLF to UHF and few milliwatts to
>> several hundred kilowatts.
>> As a retired man, it's a real pleasure to discuss in AM and feel zen.
>> But as a technician, I am always planning something to experiment.
>> 
>> 73, Daniel
>> 
>>> Le 24/08/2018 à 11:57, Rob Atkinson a écrit :
>>> Hi Daniel, thank you for explaining.  That means carrier can be around
>>> 100 to 150 watts.  That explains popularity of ART-13.  If I were in
>>> France I might be an outlaw, hi.  But 100 w. on the Continent may be
>>> okay provided one has a good antenna.  Yes the Germans made AM
>>> illegal.  They don't know how to have a good time.
>>> 
>>> 73
>>> 
>>> Rob
>>> K5UJ
>>> On Thu, Aug 23, 2018 at 5:04 PM Daniel Artaud F6BRD <f1enp at yahoo.fr>
>> wrote:
>>>> Rob,
>>>> 
>>>> I re-read the french regulations. They say: under 28 MHz: 500w pep; 28
>>>> to 29.7 MHz: 250w pep; 144 MHz and up: 120w pep whichever mode you are
>>>> using. Many are outlaw. To be closer to legallity we can use AMC
>>>> (Amplitude Modulation Compending) as used in broadcast transmitters here
>>>> in France.
>>>> 
>>>> I don't know about DL land but I never heard a german network, I often
>>>> hear G stations around 3615 kHz.
>>>> 
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