> >What kind of fine tuning controls do you have? The Quantum Phaser I > >have does not come with them. > > > >I tried it both ways, with and without the vernier drives. I was > >able to get deeper nulls with them. Sometimes just a hair made the > >difference of 5 to 10 db. That is critical in many situations. > > > > > >Bill Harms
> Mine is a classic Misek design with 4 potentiometers....2 for course tuning, and 2 for fine tuning. They seem to work great..............Walt. > PS: Normally they work fine with my "surgeon's touch", but when nulling locals, your experience parallels my own. Is this coarse/fine done by putting two pots in series, a high value (maybe 5k?) and a low value (250 ohms)? An alternative would be to use a 10-turn pot with a mechanical counter dial, these can get costly. The two pots would create an "electrical vernier" and the 10-turn pot a "mechanical vernier". I would think the "electrical vernier" option could give better resolution, as some of the 10-turn pots I remember were wirewound with a slider, OK for DC work but maybe not so good for RF due to the inductance of the winding, and the jumps in resolution. A wiper on a carbon strip inside a pot has better continuous resolution. What was the Misek design? - Bob 1433 est _______________________________________________ IRCA mailing list [email protected] http://arizona.hard-core-dx.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: [email protected]
