User manual

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
Research warrants to the original consumer purchaser
that its products shall be free of defects in
workmanship and materials from one year from
original date of purchase.
WARRANTY LIMITATIONS: This limited warranty
does not cover, and we are not responsible for, any
product which has been modified by the owner, or any
malfunction or failure resulting from improper use
improper applied voltage, improper service or repair
by the owner or his agent, or from abuse, neglect
accident, lightning damage, fire, use contrary to
instructions, or other causes beyond the control of
Autek Research. This warranty is made to the original
consumer purchaser only, and is effective only upon
presentation of documented evidence of provable
original date of purchase.
This warranty covers only Autek products, used for
purposes as advertised. We are not responsible for
incidental or consequential damages. Some states do
not allow exclusion or limitation of incidental or
consequential damages, so the above limitation or
exclusion may not apply to you. This warranty gives
you specific legal rights, and you may also have other
rights which vary from state to state.
F. REPAIR OF OLDER UNITS
The Autek QF-1A has not been manufactured since
the 1990’s and we no longer service these units. DO
NOT return for repair!
We also do not stock replacement parts. However,
most components are not critical and are standard
parts. For example, all fixed resistors are 5% ¼, watt.
Tolerance on capacitors is not critical.
Most parts, including the IC's , should be available at
(most) electronic distributors, except for the
selectivity and frequency dual pots. These pots were
specially made for us and are log-taper. We know of
no modern source of pots that plug into the board like
the originals. Also, if the function switch plugs into
the board it was custom-made.
If the pots or switches are noisy, try spraying them
with contact cleaner available from (most) electronic
distributors to remove dust and dirt buildup.
G. ALIGNMENT
The circuit has two alignments. Neither should require
adjustment unless disturbed, especially the Main filter
tracking alignment, which is quite non-critical. The
Aux Notch Depth alignment is more critical and
sensitive.
Keep the input signal low, to avoid saturation. A
scope is recommended at the filter output for most
accurate alignment, although an AC voltmeter, or
even the ear, can produce acceptable results.
The alignment frequency of 800 Hz produces best
results over the entire filter range. However, if you
desire best results at another frequency far removed
from 800 Hz, i.e. 2000 Hz, it may be better to align
the filter at the frequency of most interest.
1. Aux Notch Depth Alignment; Adjusted by the 10K
trim-pot near the left side of the circuit board – behind
the Aux Notch pot and slightly to the right. Feed in a
signal at approx. 800 Hz (not critical). Your receiver’s
calibrator beat note, or a signal generator may be used.
800 Hz is an average frequency for CW reception, and
occurs at about 10 ‘o clock rotation of the MAIN
frequency. Then adjust the trim pot for minimum
signal. Now touch up the Aux Notch freq. and repeat
the trim pot adjustment for minimum signal. Continue
adjusting until no further improvement is noted.
2. Main Filter Tracking Alignment; There are two
complete filters in series in the main filter. These
filters are adjusted to track by this alignment. The
alignment trim pot is directly behind the main (250
2500 Hz) frequency control on the right side of the
board. Feed a signal at approx. 800 Hz (not critical)
into the filter. Select “peak” and rotate Selectivity full
(20 Hz setting). Set the Aux Notch at 11,000. Peak the
signal with the main freq. control. Then adjust the trim
pot for max. response. Readjust the main freq. and
trimpot for max. response. Repeat until no further
improvement in response is noted.
Note: Alignment is the responsibility of the owner.