I have a heathkit sb200, and my friend Kenn watched my signal on an
asilascope and on am I don't drive it over 20 wats, and on ssb not
over 65 wats. If I do the positive and negative peaks aren't
semetrical. He and I figured, maybe you could get a little more
power out, but it would not sound good, and you can burn out finals,
or something.
I would rather sound good, and not drive the equipment too much.
Mike
KD2CDUAt 03:02 PM 2/6/2014, you wrote:
>Mike,
>
>Didn't see any replies on this and even though I'm no expert, that's
>never stopped me before.
>
>I don't remember what amp you have, the 811, or 811H. The 811 (3 tube)
>is rated at 500 watts cw and 600 ssb. The 811H (4 tube) is rated at 600
>cw, and 800 ssb. We can sometimes make these things put out more than
>rated power, but something is going to fail sooner or later, usually
>with a big bang. You don't want to exceed the ratings, or your legal
>limitations for your license.
>
>I'm not sure what the recommended drive is for either amp, but mic
>gain and/or processor settings can have a big say in ssb output.
>
>I wouldn't bet the farm on the accuracy of the TW-1. If you have
>sighted help, maybe compare the meters of the amp and tuner with the
>TW-1 and see what that tells you. This isn't lab grade, but all you
>can do is all you can do.
>
>Wondering if you have ALC connected. Some people will never connect ALC
>because their grandfather didn't use it. If the manual says to use it,
> use it and set it up via the instructions.
>
>For what it's worth: Both amps here (THP and Ameritron) pretty much
>suggest the same thing. If drive is set to provide max cw rated power
>(600 for the THP and 800 for the Ameritron), then voice peaks on ssb
>will approach the max ssb rating(750 THP, 1k Ameritron). Of course
>once again, various audio things will have a bearing here: mic gain,
>processor, microphone, your own voice, phases of the moon, and so on.
>
>So if I set drive for max cw output, but tweak the audio stuff too hot,
>I can go beyond rated ssb output, but not good for the amp, and probably
>not very clean on the air.
>73, good luck with the new amp and antenna, Steve KW3A
>
>
>
>
>On 2/5/2014 9:49 PM, Mike Ryan wrote:
> > Hi all:
> >
> > I got my amp installed, going to put the Braille around the plate and load
> > controls tm.
> > When I fired it up into a DL on 80m earlier tm I got 600w key down CW with
> > 40w of drive and over 800w on SSB.
> > Should I be concerned? With 60w of drive, I was seeing, well hearing lol,
> > over 900w. I didn't switch to the antenna because my SWR spike prob has
> > returned and we have traced it down to either leaky coax or a n ice/snow
> > build up on the antenna when it's folded down.
> >
> > TNX and 73:
> > Michael DE VO1AX
> >
> >
> >
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