[AMRadio] AM worldwide

[Daniel Artaud F6BRD]

With AMC, you reduce carrier power in the same time you increase 
modulation percentage,thus you reduce also PEP. This is done in SSB 
transceiver operating in AM by means of ALC. for example 40w without 
modulation and ALC reduces to 100w PEP, the maximum allowed by the power 
amplifier.
In broadcast this was done for power consumption saving, there is also 
another way which acts in the opposite way with various schemes called: 
DCS, ACC, DCC, DACM and possibly others.
http://www.gatesair.com/documents/slides/2015-07-Anderson-Application-of-MDCL-Control-Tech.pdf 
page 3
https://www.nrscstandards.org/standards-and-guidelines/documents/archive/nrsc-g101.pdf 
page 12

Daniel, F6BRD

Le 24/08/2018 à 01:00, W2xj a écrit :
> AMC would be interesting for experimentation but I fail to see where it eases PEP restrictions. Depending on the form of AMC used, it could increase carrier power during periods of low modulation but the PEP remains the same.
>
> Sent from my iPad
>
>> On Aug 23, 2018, at 3:04 PM, Daniel Artaud F6BRD via AMRadio <amradio at mailman.qth.net> 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.
>>
>> 73 de F6BRD
>>
>>> Le 23/08/2018 à 15:46, Rob Atkinson a écrit :
>>> Hello Daniel,
>>>
>>> Are you saying that in France, the AM power limit is 500 watts carrier
>>> modulated 100%?
>>>
>>> If that is correct, that is excellent!
>>>
>>> I believe in DL land, AM is illegal  :(
>>>
>>> 73
>>>
>>> Rob
>>> K5UJ
>>>
>>>
>>> On Thu, Aug 23, 2018 at 7:20 AM Daniel Artaud F6BRD via AMRadio
>>> <amradio at mailman.qth.net> wrote:
>>>> Hello
>>>>
>>>> AM activity is well alive in France and is growing slightly. I think we
>>>> are around one hundred as we can have more than 50 stations during the
>>>> "AM nights" an event which takes place 2 times per year at each time
>>>> change. The bands used are mainly 80 m and more rarely 40 m. The
>>>> equipments used are restored military ones, home made or commercial
>>>> Heathkit, Geloso, Ecreso... SSB/"AM" transceivers are almost
>>>> non-existent. The ART13 is the more common military transmitter used;
>>>> some years ago it was possible to buy rebuilt ones (around early 60's)
>>>> in original packaging for 150€.
>>>> The power used is around 100w and up to 500w carrier.
>>>> Apart from AM nights French AMers are used to meet on 3600 kHz in the
>>>> morning up to 09H00 local time and in the evening from 18H00 local time.
>>>> For more about French Amers activity see: www.araccma.com/
>>>>
>>>> Equipment used: Heathkit Apache w/o audio preamp/limiter, Collins ART13,
>>>> Rohde & Schwarz ESH2, Optimod TV SAP with adaptive preemphasis modified,
>>>> low-pass filtered to 6 kHz but still some work to do to reduce overshoots...
>>>>
>>>> 73 de Daniel, F6BRD
>>>>
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