Autek Research QF-1A Uživatelský manuál

Autek Research QF-1A Active Audio Filter User Manual

Inside View of Autek QF-1A (Component Placement) Illustration shown includes after market modifications: DC power input jack connected to ON/OFF sw

Bottom View of Autek QF-1A PC Board As illustrated: Top-Right control = R4 (Aux Notch) and Bottom-Left 14-pin IC = U3

Your Autek QF-1A audio filter is the product of several years of development by the originator of commercial active audio filters for shortwave commun

C. USEFUL ADJUSTMENTS See Tables 1 and 2. D. IN CASE OF TROUBLE We carefully test all filters. Most problems occur when first used due to imprope

Table 1 USEFUL ADJUSTMENTS Your QF-1A can “imitate” the response of virtually any filter with fixed response, at any price, and give an infinite numb

Table 1 (continued) Weak CW An AC voltmeter, or scope, across the filter output is a big help in peaking weak CW signals. Strong Signal A “f

Table 2 (Condensed Version of Table 1): Condition Function Selectivity Main Frequency CW PEAK or LP 8 o’clock or more For best copy Voice Sp

E. WARRANTY AND RETURNS We back our products better than most companies --not just 90 days, but one full year. LIMITED ONE YEAR WARRANTY: Autek Re

H. LATE NOTES If you wish the QF-1A to drive a speaker in “bypass” you must obviously connect the QF-1A input to a rig output which is capable of dr