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
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 essenti
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 250
power 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
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
Good afternoon,
Does anyone have any tips on running the KPA1500 amp in the AM mode?
73, Lou W2LTF
H 973-726-8300
C 917-270-5421
Sent from my iPhone
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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
/elecraft.com
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 10
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.
Bill W2BLC K-Line
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