Topband: Re: Topband digest, Vol 1 #328 - 3 msgs

[Hal Kennedy]

Ken,

The PT-2 is a reasonably good preamp for 1.8, I have used mine for years.  
It requires a little mod or two however, to keep stray noise out.  When I 
first started using mine, I was picking up an extra 2 S-units of noise, 
which I finally traced to ingress of noise on the preamps AC line cord.  
Opening the unit up revealed the problems (poor routing of the input/output 
connector wires right next to the line cord).
1)  Replace the internal I/O wires with coax.
2)  Wrap the line cord a few turns onto a high mu toroidal core, to make a 
common mode choke at the outside of the box, just as the AC line cord enters 
the back.

A good preamp after the mods --
73,
Hal
N4GG



> >Subject: Topband: Ameco PT-2 Preamp
>
>   I have an old Ameco PT-2 preamp I'm thinking of using on the lowabands.
>I'm curious if anyone has used this particular model in the 1.8 Mhz to 3.5
>Mhz range and if it's any good.  Second, the manual mentions the ability to
>add a second receiver.  However, a modification sheet is needed from Ameco.
>Has anyone attempted this modification or do you have the modification
>sheet?
>
>73
>Ken K4ZW
>
>
>
>
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>End of Topband Digest




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