Frank,
I don't know what you mean by "power absorption". I
don't see such variations in power output on my analog
meter. If you are using a digital meter, I would
check the meter itself. Does it work stably on some
other transmitter?
For fun I have produced a couple of videos of what I
see on my setup. You can go to
http://www.aa6e.net/aa6e/orion_pwr.html for these.
(Helps to have a fast Internet connection!)
73, Martin AA6E
--- I2DMI <i2dmi@contestvolta.it> wrote:
> Martin, Bob,
> thank you for the messages.
>
> My idea is a little bit different.
> If that were an only software (s-meter) related
> problem, the current
> absorption should be constant.
> Sometimes the output power reduces approx 10/8W at
> the beginning of the
> transmission, then when reduced the variation
> continues about (+ and -) 2/3W
> values.
> It is more real then apparent because I read all
> these variation on the
> digital display of my antenna tuner (MFJ-993). The
> RF power-out value
> appears like the numbers of a slot machine, with ...
> some relaxing-stop!
> I'll continue testing. My amplifier also doesn't
> like unstable driving RF !!
>
> I hope this problem is not related to some defective
> component of my
> ORION.(one week old!)
>
> thank you
> Frank - I2DMI
>
> -----Original Message-----
>
> I spoke to TenTec about this about a month ago and
> what they told me is
> exactly what Martin suggested as the reason for the
> apparent variation.
> It's more apparent than real.
>
> Bob W2WG
> ---------------------------
> From:
>
<http://lists.contesting.com/mailman/listinfo/tentec>
> tentec-bounces
> at contesting.com [mailto:
>
<http://lists.contesting.com/mailman/listinfo/tentec>
> tentec-bounces at
> contesting.com]
> On Behalf Of Martin AA6E
> Sent: Sunday, January 02, 2005 1:18 PM
> To:
>
<http://lists.contesting.com/mailman/listinfo/tentec>
> tentec at
> contesting.com
> Cc:
>
<http://lists.contesting.com/mailman/listinfo/tentec>
> ditsnbits at
> tentec.com
> Subject: Re: [TenTec] ORION - RF output is not
> stable
>
> I can repeat this in CW mode, especially when
> adjusting for moderate power, around 50 W. The
> Orion
> power meter fluctuates by up to 10% a few times per
> second.
>
> The good news is that the actual output power is
> fairly steady, as seen on my external SWR meter.
> (There are fluctuations at the few percent level,
> however.) The problem seems to be in the meter
> circuit. The Orion meter is driven by the firmware
> controller (DragonBall) through a digital to analog
> converter. I think what we are seeing is noise in
> the
> power measuring and/or DAC circuits of the Orion.
> It
> does appear to be cyclical, but that probably
> relates
> to some software cycle.
>
>
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|