> he tried to set up the bfo adj's ,but didn't have test gear up to the task.
>
>
Test gear needed to adjust BFO crystal oscillator frequencies in Omni VI
(and I am guessing also Omni V)
Method 1, simplest:
1 eA frequency counter with resolution and accuracy down to about 10 Hz
at 9 MHz.
1 eA high impedance probe
1 eA insulated trimmer capacitor adjustment tool
Method 2, if you don't have access to the frequency counter, but more
difficult:
1 eA general coverage receiver that can listen to 9.000 MHz and 9.003
MHz. Doesn't even need to have a BFO.
1 eA 100 kHz crystal calibrator that will generate harmonics up to 9 or
10 MHz (10 MHz so you can calibrate the calibrator against 10 MHz WWV)
1 eA computer with sound card and program that can accurately tell you
the beat frequency between 9.003 MHz and 90th harmonic of 100 kHz.
1 eA high impedance probe
1 eA insulated trimmer capacitor adjustment tool
You can build the probe from a small capacitor and a resistor, or you
may even get enough signal with a little pick up loop on the end of a
piece of coax. Even a plain screwdriver will do, but will require more
patience and finesse.
DE N6KB
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|