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Re: [TenTec] A polite suggestion to remove old e-mail parts and question

To: tentec@contesting.com
Subject: Re: [TenTec] A polite suggestion to remove old e-mail parts and questions about power supplies for different generations of TT transceivers
From: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Reply-to: geraldj@weather.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sun, 12 Dec 2010 18:58:07 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>

On 12/12/2010 6:27 PM, Chris Wagner wrote:
> Hello,
> a) it would really help to "clean up" and delete stuff before sending a
> reply. Otherwise, the same messages get repeated all over again and again
> and again, cluttering up the reflector.

> b) A TT ps protects the transceiver as it will shut down if the SWR gets too
> high.

Almost true. The power supply only protects the PA transistors if the 
high SWR load presents a low impedance at the transistor collectors and 
so causes a high collector current. If the load with high SWR presents a 
high impedance load at the collectors the power supply won't shut down, 
its up to the voltage handling capability of the transistors to protect 
> For those with generations of TT transceivers, can you use an old ps for
> more recent transceivers?

I'd think so, they all run about the same output power, 100 watts and so 
about the same normal and excess collector current.
> And a new ps (962, 963) for older ones? (Paragon and Omnis)

I think so.
> How quiet is the switching ps?

Some switching supplies are silent, especially when made for radio use. 
Others are not so quiet.
> Thanks and 73,
> Chris KF6VCI  HS0ZFE
73, Jerry, K0CQ
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