[TenTec] Scout 555: power goes down as frequency goes up

MadScientist dukeshifi at comcast.net
Fri May 31 23:40:53 EDT 2019

Does your Scout have the FET driver transistors or the bipolar?

Can you measure current drawn by the radio when transmitting?

If so, check to see if the current draw on the weak bands is the same or higher than on the strong bands.

As it happens, the signal going through the driver stage can get distorted (harmonic distortion) and these harmonics go into the final  but not out the low pass filter, so all that lost signal is lost as heat in the final and LPF.


Sent from my iPad

> On May 31, 2019, at 10:29 PM, Carlos <carlos.peco at gmail.com> wrote:
> Hi,
> I'm very fortunate having several Ten-Tec radios. I use one for several
> weeks, then I put it aside, and use the next one for some more weeks.
> So I have this Scout that I have only used in 80/40, where it puts full
> power (slightly more in 80 meters). But I also have modules for 20/15/10
> and the other day I decided to check their health.
> Well, everything seems to be OK in RX but, to my dismay, output power drops
> as you go up in frequency, up to the point of putting less than 5W in 10
> meters.
> Before I start investigating, maybe someone knows of a common issue that I
> should be looking at in the first place?
> Many thanks in advance,
> Carlos VK1EA
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