[AMPS] Dope question

[Mike Sawyer]

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
amp).
I hope this helps Phil.
Mike(y)
W3SLK
----- Original Message -----
From: measures <2@vc.net>
To: Phil Levin W2GE <w2ge@home.com>; <amps@contesting.com>
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.
> end
>
>
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