Hi All, I have successfully used this method to retune 27MHz radio control crystals to produce a couple of channel frequencies around 433.500 MHz (when multiplied by 16). I used a pencil rubbed gentl
Figure of 8 is quite right ,The trick was to cut a shallow shape in the face of a large cork to hold the crystal and to to cushion it . Also to finish with what used to be called "Jewellers Rouge". A
I work the FT-243 Xtals and similars with ammonical bifluoride acid (FH-FNH4), much less aggressive that the fluorhydric acid (FH) I utilize two disolutions marked as 5khz/10_min and 1,5khz/30_min. T
The acid mentioned in a earlier posting was Hydrofluoric acid, a very dangerous acid, not because of its strength but of the way it attacks the skin. The use of this is not to be undertaken likely, d
Hi All, When I built my first xtal controlled Tx (2 Metres) I changed the frequencies of xtals for the oscillator using very fine carborundum paste & rubbed the quartz slice in a figure of 8 movement
I even used sandpaper to make the quarz thinner and thus increase the frequency. That worked sometimes up to 10%. 73, Rik ON7YD - OR7T Quoting [email protected]: In the ol days we would use a penc
In the ol days we would use a pencil or rub a bit of solder on the face real hams used ? acid to etch and raise the frequency,, I dont remember what the acid was but the local chemical company would
For those who didn't know, use following 'trick' to tune your own X-tal. (found it in a magazine from the VERON) Remove the metalcover and place the remains in an oscillator. Now it will oscillate on
