I use a 10 dB attenuator between my radio and my transverter. That assures
that the ALC is in a good efficient range. Also assures that one won't
damage the transverter with an accidental overdrive.
The 10 dB attenuator is a T configuration. The input series R is 25 ohms
made of 4 x 100 ohm 2 W carbon resistors in parallel. The shunt R is 33
ohms made of 3 x 100 ohm 2 W carbon resistors in parallel and the series
output R is a 2 watt 27 ohm resistor. Close enough to 10 dB attenuation and
50 ohms in and 50 ohms out.
If you need less loss then here values for 6 dB. Input series R is 17 ohms
made of 4 x 68 ohm 2 W carbon resistors in parallel. The shunt R is 67 ohms
made of 4 x 270 ohm 2 W carbon resistors in parallel. the series output R is
a 2 watt 18 ohm resistor. Again, some 6 dB attenuation with about 50 ohms
in and out.
These values will handle 25 to 35 watts of SSB with no problems. Watch CW
key down or tuning times as the dissipation of the R's may be exceeded.
If you need other values of loss or input or output Z, let me know. I
figure the values for you.
----- Original Message -----
From: "Steve Berg" <firstname.lastname@example.org>
To: "Discussion of Ten-Tec Equipment" <email@example.com>
Sent: Monday, December 31, 2007 7:00 PM
Subject: Re: [TenTec] Nother' discovery about the Corsair & Titan
>I tried to set up my Corsair II with my Elecraft transverters. It takes
> about 3-4 watts to drive them to the output levels required by my Mirage
> brick amplifiers on 6 and 2 meters. I can readily use my Argonaut II
> and the Omni V with the transverters, but when I use the Corsair, I have
> problems on SSB with voice peaks overloading the transverters, while the
> average power is fine. Is this something that I can correct with the
> ALC control?
> Steve WA9JML
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