[Moon] [Moon-net] Two-meter power spikes ruining TE Amplifiers?

[Per Sjölander]

Think this is a most common problem on a lot of radios today and one way 
forward is putting a "fixed" but adjustable ALC input to the radio to adjust 
the output power.

When setting the output level by software in the radio the power is most 
probably controlled by an ALC feedback causing spikes on the output.

The spikes in many cases appear in the start of each cw dash or dot and not 
only when keying up in FM.



By using a long-term fixed control of the output power also the spectra on 
the transmitted signal will be a lot cleaner both on SSB and CW. Could be 
very nice for your neighbours also if they are not ham's. :-)



73

/Per SM3JQU





----- Original Message ----- 
From: "Cristofori Concerts" <kc3re at yahoo.com>
To: <moon-net at list-serv.davidv.net>; <moon at moonbounce.info>
Sent: Friday, December 14, 2007 3:22 PM
Subject: [Moon-net] Two-meter power spikes ruining TE Amplifiers?


>I wonder if anyone has nad experience with this question?  I have
> ordered a new TE Systems 400 watt (c. 20 watts in,) amplifier to use
> with my FT-857, and just picked the following post on the FT-857 board:
>
> "Don't know about final bias on 2m and the -857, but apparently this
> radio
> really puts out a power spike when keyed up on 2m, far above rf pwr out
> setting. Seems the rf pwr out is alc controlled, etc.. Not a big deal
> unless
> you're using an amp at max input limits. I understand the TE Sys amps
> sometimes get taken out by such a spike, and not just fm -857's."
>
> Many thanks for any advice about how to avoid potentially blowing out
> an expensive new amp.
>
> 73,
>
> Martin, KC3RE
>
>
> 
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