Precise calibration of a monitor scope isn’t that terribly essential. An SB-610
or equivalent is hardly a precision instrument, but more than adequate. The
point of the scope is primarily to observe and prevent negative peak clipping,
ensure you’re not out of headroom and starting to flattop
On 2021-02-04 3:12 PM, Grant Youngman wrote:
Actually, that assumes that peak to avg is exactly 4. Which it
rarely (never?) is with a real human voice.
It also assumes the modulation is symmetrical and that the mic is
wired with the correct polarity.
> A monitor scope on the output is
Actually, that assumes that peak to avg is exactly 4. Which it rarely (never?)
is with a real human voice.
Aside from the legal (and oft disputed) aspects of AM power limits, you’re
better off being conservative and setting drive levels for something under 375W
carrier from the amp. Maybe
to about
200 watts, that should be safe.
73
Frank
W3LPL
- Original Message -
From: "Morgan Bailey"
To: "Louis Fiore" , Elecraft@mailman.qth.net
Sent: Thursday, February 4, 2021 7:22:13 PM
Subject: Re: [Elecraft] KPA1500 on AM
The max that you can lega
The max that you can legally run is 375 watts carrier. That on AM will get
you 1500 watts PEP. YMMV. I do not know the spex on the 1500 but that may
put you in the ballpark. Understanding linearity, for AM is covered here:
https://www.w8ji.com/am_linear_amplifiers.htm
If you want to run AM, this
Agreed. AM with carrier set properly to 25% of peak power (1500 * 0.25 = 375 W
max carrier ) is no strain for the 1500. With the normal variations of the AM
speech envelope between the 235 W carrier and the peaks at 1500W, the amp is
loafing along at any key down time. :-)
Eric
On 15/02/18 11:12, Bill wrote:
> How well will the KPA1500 do on AM during very long-winded QSOs? I
> currently use my KPA500 on AM and it does fine - albeit a little noisy
> in the fan department. For information only: The K3 garners excellent
> audio reports on AM.
To prevent flat-topping at
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