Hi!
If your rig has FM and has full output power there without warnings of
FM TX period lengths the PA should handle it.
FM, or CW carrier on, are most closest to continuous tone modulated SSB.
As Reino says AM must have smaller carrier for modulation reasons.
Reino Talarmo kirjoitti 3.2.2021 klo 23.56:
Hi Mike,
Please don’t mix AM at all with e.g. Q65 that are using
frequency-shift keying and don’t have any amplitude modulation. In
most rigs the 25 W versus 100 W is due to keep amplitude modulation in
PA linear range. As such it is not due to possible high temperature rise.
Your 25 W rule is on safe side for 300 s Q65 as it starts to be same
as continuous transmission in most rigs.
73, Reino OH3mA
*From:*Black Michael via wsjt-devel
[mailto:wsjt-devel@lists.sourceforge.net]
*Sent:* 3. helmikuuta 2021 23:28
*To:* wsjt-devel@lists.sourceforge.net
*Cc:* Black Michael <mdblac...@yahoo.com>
*Subject:* Re: [wsjt-devel] 2.4.0 RC1 - Decodes show no callsign
I will add that many operators aren't aware that their rig can't do
full power on all modes.
Many rigs rated at 100W can only do 25W in AM mode (100% duty cycle)
-- the manuals do show this.
For those rigs I always recommend to the ops to run FT8 at 50W max to
avoid pushing the temperature on their rig's finals.
So a 300 seconds Q65 would definitely be 100% duty cycle and a max of
25W or whatever your manual says is the AM maximum power level.
Mike W9MDB
On Wednesday, February 3, 2021, 03:20:48 PM CST, Bill Somerville
<g4...@classdesign.com <mailto:g4...@classdesign.com>> wrote:
On 03/02/2021 21:02, Edfel Rivera wrote:
> Hi:
> Please see attachment. Seems to be decoding or the functionality is
> correct. Also, what TX power could be used? As TX intervals increase,
> Could that cause damage to rig terminals? Thinking of JT65 where TX
> power < ~30watts.
>
> BTW, Thank you very much for INNOVATION. Seems like another fantastic
> mode.
>
> 73'
>
> Edfel
> KP4AJ
Hi Edfel,
the lines in the Single-Period Decodes window without decodes indicate
the best, but not decodable, candidate signal within the current
frequency tolerance window. They may provide indication that a station
is transmitting.
As for Tx power, nothing new there, use whatever is needed to make the
QSO and not more. That could be 1500 W or 1 pW depending on the band,
path, and conditions. For EME and VHF weak signal modes like ionoscatter
a few hundred watts may be necessary. Like JT65 Q65 is 100% duty cycle
and the same considerations for PA current and temperature should be
observed as would be for any other 100% duty cycle mode like FM.
73
Bill
G4WJS.
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