[TenTec] ORION - RF output is not stable

[Richard Detweiler]

Hi All,

The Orion has a control that limits the transmit power.   It is apparant 
when adjusting the power upwards or after a tune sequence,   the next 
transmission increases the power gradually to the 'PWR' setting or based on 
the detected SWR

If that circuit is having a problem, it could be sending false signals back 
to limit the power.

Might want to talk to TT in the morning about it.


Best 73's
Rich
K5SF


>From: "I2DMI" <i2dmi at contestvolta.it>
>Reply-To: tentec at contesting.com
>To: <tentec at contesting.com>
>Subject: [TenTec] ORION - RF output is not stable
>Date: Sun, 2 Jan 2005 21:00:39 +0100
>
>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.
>
>
>
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