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 <neil...@earthlink.net> 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 | Twitter.Com/CoffeeCrew | Victoria B.C. Canada* _______________________________________________ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com