[Amps] TR: ETO 91b help please.

robert.thain@ratp.fr robert.thain@ratp.fr
Mon, 16 Dec 2002 13:22:52 +0100


Sorry forget my E-mail address,
G0HGW@yahoo.com 

> ETO 91b help please.
> 
> I recently bought my first amp, a 91b second hand.
> 
> It was demonstrated to me working fine on a real antenna, (not a dummy
> load).
> I went to use it for the first time for the ARRL 10M.
> It has the 10m modification for outside the US, the tapping on the
> transformer is correct for 220V.
> The relay was switched manually and not by the radio.
> The SWR on the antenna is about 1.2:1and has been used with amps before.
> 
> I followed the tune up procedure in the booklet enclosed with the amp, but
> it just 'faults out" every time.
> In the booklet it suggests starting with Tune = 40 and Load =80.
> Once I have followed the procedure I end up with Tune = 10 and Load = 0.
> As I increase the power I get to about  800w out, then it trips.
> 
> I do not think it is normal for the Load to be so low.
> What am I doing wrong?
> I am an 'antenna' ham and not a 'radio technical ham', this is a (big and
> bloody heavy) black box to me, so please keep it simple if its possible.
> 
> Thanks
> 
> Robert 
> G0HGW 
>