On 2023-09-07 14:56, K9HZ wrote:
That¡¯s why I build the digital attenuator board to use with the
PAs¡ Use the full range of the A/D then¡ and attenuate the power
where it should be attenuated.
*** Definitely the way to do it. Every last bit of A/D resolution is
precious.
For my own use case, I only need 10W. Because my linear will turn that
into 800W. I do need to be able to output 15W or so just for tuning. I have
an MFJ998 remote autotuner at the base of my antenna, and it takes 15W
to urge it to tune. Hitting it with the full 800W when it's not properly tuned
can fry it.
Setting the T41 to a quarter watt for tune should get me a reasonable output
out of the linear.
So - the two power levels I need are 10W and 1/4W.
- Jerry, KF6VB
DR. WILLIAM J. SCHMIDT - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ
PJ2/K9HZ VP2EHZ
Owner - Operator
Big Signal Ranch ¨C K9ZC
Staunton, Illinois
Owner ¨C Operator
Villa Grand Piton ¨C J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com [1]
Moderator: North American QRO Group at Groups.IO.
Moderator: Amateur Radio Builders Group at Groups.IO.
email: bill@...
FROM: [email protected]
<[email protected]> ON BEHALF OF Greg KF5N
SENT: Thursday, September 7, 2023 11:00 AM
TO: [email protected]
SUBJECT: Re: [SoftwareControlledHamRadio] T41 Transmitting (noise in
ssb)
It will take some calculating to discover the optimum amplitudes out
of the Audio Hat.
Voice peaks need to be accounted for. So you can't drive too hard or
the peaks will get clipped.
The T41 power control is done by varying the I and Q amplitudes. So
that is another consideration.
If you want power varied from 1 watt to 20 watts that soaks up a lot
of the DAC range.
And then you have to add the voice peak problem on top of that.
--
73 Greg KF5N
Links:
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[2] /g/SoftwareControlledHamRadio/message/24140
[3] /mt/101160969/243852
[4] /g/SoftwareControlledHamRadio/post
[5] /g/SoftwareControlledHamRadio/editsub/243852
[6]
/g/SoftwareControlledHamRadio/leave/10484476/243852/1943518115/xyzzy
