06-11-2012, 03:25 PM
(This post was last modified: 06-11-2012, 03:29 PM by Radio Fixer.)
Hi John
Watched the vid with interest. Is the new dial a silk screen job? Interesting one to do artwork for in Corel Draw.
Now to the IFs: a neat small scope there with the direct freq readout. I tried your way of doing a measurement on an IF and compared it to mine and of course if the tuned cct will resonate they have to give the same reasult.
Actually they are identical except I have a 120K feed from the osc and you have the 10M of the scope probe (I assume it is a 10M probe?) in circuit. In mine it is easy to see that the 10M and the 10pF of the probe is across the tuned cct. It is in your case too as Ro (Rout) of the osc will be low.
Dont forget to clean away the clear coat on the chassis for earthing tags or use toothed washers under them. Another way is it to put on solder tags, for earth points first, and mask the solder part before spraying. And if its is to be a bolted down tag, on a strip, a nut bolt and washer of appropiate size, can be fitted before spraying and then discarded during the build (this often gives a neater job than trying to remove clear coat after).
Gary
Watched the vid with interest. Is the new dial a silk screen job? Interesting one to do artwork for in Corel Draw.
Now to the IFs: a neat small scope there with the direct freq readout. I tried your way of doing a measurement on an IF and compared it to mine and of course if the tuned cct will resonate they have to give the same reasult.
Actually they are identical except I have a 120K feed from the osc and you have the 10M of the scope probe (I assume it is a 10M probe?) in circuit. In mine it is easy to see that the 10M and the 10pF of the probe is across the tuned cct. It is in your case too as Ro (Rout) of the osc will be low.
Dont forget to clean away the clear coat on the chassis for earthing tags or use toothed washers under them. Another way is it to put on solder tags, for earth points first, and mask the solder part before spraying. And if its is to be a bolted down tag, on a strip, a nut bolt and washer of appropiate size, can be fitted before spraying and then discarded during the build (this often gives a neater job than trying to remove clear coat after).
Gary
