[UK-CONTEST] RX antenna pre-amp

[G3SVL]

Thanks to Chris (G3SJJ) and Chris (G1VDP) for pointing out my 
computer clock was just a tad on the slow side! Looks like the bios 
battery has given up. I wonder how it picked a date in Sept 2003?

Chris G3SVL

----------


At 22:52 15/11/2006, G3SJJ wrote:
>Thanks Chris, even though you sent your reply just over two years before
>I posted my question. Dr Who?
>
>Anyway, thanks for that. I will screen the leads and add some more
>decoupling. I've got a .01 across the 12v ip but will dob some more around.
>
>I think though I have located the problem. I have a 4p 3w switch (Maplin
>plastic) on the front panel to go 80m - Off - 160m, for when I get the
>bandpass filters finished. It also bypasses the amp, in that it shorts
>Ip to Op when in the Off position. Looks as though there is too much
>self capacitance and it going into oscillation. If I diss the
>connection  from the input pad to the switch it all works as it should.
>
>Getting there!   Chris G3SJJ
>
>
>
>G3SVL wrote:
> > At 21:39 15/11/2006, G3SJJ wrote:
> >
> >> I have assembled a little TenTec Broadband RF Pre-amp kit No 1001 in an
> >> ali box but having probs. I suspect it may be taking off. ......
> >> Anyone got any
> >> experience of this amp and how I might tame it?
> >>
> >
> > Chris,
> >
> > I have exactly the same amp and it works fine.
> >
> > 8cm sounds way too long for the I/O leads - the box my amp is in
> > isn't that long!  I would definitely screen them and make sure they
> > don't run parallel to each other if possible.  You might also ensure
> > the decoupling on the power supply is good - I think I added caps to
> > make sure - look on Ian's (SEK) site for decoupling theories.
> >
> > 73  Chris  G3SVL
> >
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