Re: [IRCA] September 17 TP/DU Victoria B.C. Canada - the money shots

[Chuck Hutton <charlesh3@xxxxxxx>]

My personal preference is to avoid those 10 turn pots. They aren't needed if you don't require a wide range, and I don't have any use for resistances below 700 and above 1200. Therefore, I use a 470 Ohm resistor in series with a 500 Ohm pot. It still requires a careful adjustment but is not hard. Some might even want 680 Ohms and a 250 Ohm pot.
Chuck

> Date: Thu, 17 Sep 2015 09:09:48 -0700
> From: coffeecanuck@xxxxxxxxx
> To: neilkaz@xxxxxxxxxxxxx; irca@xxxxxxxxxxxxxxxx
> Subject: Re: [IRCA] September 17 TP/DU Victoria B.C. Canada - the money shots
> 
> My VACTROL sweeps from around 120 ohms (and that is a design thing that I
> can change/lower) to around 3 K ohms.
> 
> I find my actual sweep of useful termination resistances are between 750
> and 950 ohms - I have not yet done a complete calibration on
> my current prototype (and I am building 3 more quickly with hopes of
> on-demand production for other dxers...)
> 
> I use a 10 turn 1K pot in the DC controller and a calibrated 14 revolution
> knob that is divided in 1/10ths
> 
> So far I have only concentrated on the low band / 530 khz to 1100 khz and
> it is quite remarkable dialing out offending stations from the South/South
> East!
> 
> On Thu, Sep 17, 2015 at 9:03 AM, neilkaz <neilkaz@xxxxxxxxxxxxx> wrote:
> 
> > Nice stuff! How much Rt variation do you have to do across the band with
> > the vactrol to optimize F/B?  73 KAZ
> >
> >
> 
> 
> -- 
> 
> *Colin Newell is the Editor and creator of Coffeecrew.com
> <http://www.Coffeecrew.com> - Coffee.bc.ca <http://Coffee.bc.ca> and
> DXer.ca <http://www.DXer.ca> -| Amateur Radio VA7WWV |
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