Slow Motion drives. - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

G6Tanuki · 26th Nov 2023, 9:09 pm

Quote:

Originally Posted by Cruisin Marine

[I]
Perhaps a slo mo drive and an added edge wise thumbwheel connected to a varicap may give the answer?

I think my idea of a slo-mo drive to the multiturn pot for the whole thing is easier.

15 turn pot and 6:1 slo-mo gives 90 turns to cover 300KHz, which sounds like a nice slow tuning rate.

high_vacuum_house · 26th Nov 2023, 9:18 pm

Just my thoughts.

How about fit the largest knob you can fit onto the receiver?. This will also help the physics of moving the knob I.E a greater torque would be developed which will mean less force required to overcome the grease in the mechanics compared to a small knob, and also with a large knob the circumference of the side of the knob is also longer and therefore easier to fine-tune than a knob with small dimensions.

Christopher Capener

26th Nov 2023, 9:18 pm	#22
high_vacuum_house Octode Join Date: May 2003 Location: Belper Derbyshire Posts: 1,832	Re: Slow Motion drives. Just my thoughts. How about fit the largest knob you can fit onto the receiver?. This will also help the physics of moving the knob I.E a greater torque would be developed which will mean less force required to overcome the grease in the mechanics compared to a small knob, and also with a large knob the circumference of the side of the knob is also longer and therefore easier to fine-tune than a knob with small dimensions. Christopher Capener __________________ A proper radio is one that needs to be moved with a wheelbarrow !!