[AMPS] Dope question
Tue, 25 Apr 2000 16:54:07 -0400
Now a more serious side, Phil:
When setting your ricebox for AM, turn off ALL signal processing. Adjust
the ALC until you either detected meter movement, (if you have a meter) or
you detect light on the lamp, (if you have a lamp). This will give you the
best quality audio on AM far from changing your microphone. If you really
want to get creative, you can take an EV-664 into the input of the phone
patch and your audio will be un-hindered. Once that is setup, adjust your
amp for about 300 watts out without modulation, (this is assuming a 1KW
I hope this helps Phil.
----- Original Message -----
From: measures <firstname.lastname@example.org>
To: Phil Levin W2GE <email@example.com>; <firstname.lastname@example.org>
Sent: Tuesday, April 25, 2000 1:13 PM
Subject: Re: [AMPS] Dope question
> >Not that I operate AM, only made 1 qso on that mode...
> >But can someone explain to me why you can or can't use a linear on AM?
> 100% modulation
> >An electronically challenged extra...
> You can use a linear on AM. With a modern radio as the driver, very low
> distortion AM is typically produced. Plate modulation does not produce
> nearly as low of a distortion level. . It is important to tune up an AM
> linear at the max pep output from the exciter, and then to adjust the
> carrier control for 25% of max pep. In typical use, the AM linear will
> indicate roughly half of max. anode current under carrier conditions.
> With modulation, indicated anode-current should barely wiggle. At max
> pep output, efficiency is around 60%. A typical 1500w SSB amplifier will
> typically make about 375w of carrier with 100% modulation. Since no
> heavy modulation transformer and no modulator ps are needed, AM linears
> typically weigh less and are more compact than an old fashioned lashup.
> later, Phil.
> - Rich..., 805.386.3734, www.vcnet.com/measures.
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