[Boatanchors] Speech Amp Again

[Carl]

Shielding may create a ground loop problem between units. If hum is a 
problem try the shielding with grounding at one end at a time and then 
both. As John said twisting is the most important step, as it cancels 
common mode problems.

Im using twisted # 16 cloth covered wire (just like in the old days) to 
both of my modulator decks with no hum pickup.

Carl
KM1H


----- Original Message ----- 
From: "rbethman" <rbethman at comcast.net>
To: "Barrie Smith" <barrie at centric.net>
Cc: <boatanchors at mailman.qth.net>
Sent: Wednesday, November 19, 2008 2:04 PM
Subject: Re: [Boatanchors] Speech Amp Again


> Barrie,
>
> I DEFINITELY shield them.
>
> Bob - N0DGN
>
> Barrie Smith wrote:
>> Good Day:
>>
>> Should the leads from the speech amplifier, or the matching 
>> transformer, to the input of the HT-4B be shielded?
>>
>> 73, Barrie, W7ALW
>>
>
> -- 
> Bob - NØDGN
>
> _______________________________________________
>