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Re: [TenTec] Omni V power limits

To: geraldj@weather.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Omni V power limits
From: Richards <jruing@ameritech.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Thu, 01 Jul 2010 16:08:22 -0400
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Does this sort of distortion occur if I run the rig at a moderately
low power output, and let a linear amp make up the difference?
In other words, if I keep the rig running real easy and clean, will
the amp, itself, add an undue amount of distortion?    I thought
that would allow the amp to run kinda easy also.

Interesting thread.
=============================== K8JHR ====================

On 7/1/2010 9:39 AM, Dr. Gerald N. Johnson wrote:
> Part of the reason for running low power with the digital modes is
> intermod distortion that causes increased bandwidth, and part is the
> available power dissipation of the radio. I have confidence the PA
> transistors in the Omni V have plenty of heat dissipation but the radio
> may not have quite enough. Thing to watch in RTTY (not so critical on
> intermod as PSK31) is the temperature rise of the heat sink. I'd look
> for a high volume muffin fan and fabricate mounts to blow air on the
> case heatsink. Optimally it would be controlled by a temperature sensor
> on near the PA transistors.
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