U Autek Research QF-1 $ SOLD Audio Filter This Autek Research QF-1 audio filter features: Peak, Notch and Low Pass. Input is via a hard wired ¼. Autek Research, PO Box , Wesley Chapel, FL USA. () RF1 RF ANALYST. The pocket-sized RF1 is designed. Hi, I have for sale one used Autek Research model RF-1 antenna analyser. It works well and is great for analysing antennas in the field.

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The only issue is that the analyzer then emits a tone which is in proportion to the SWR. I can’t stress this enough. The frequency determined by computation was This gives me the convenience of the analyzer with a hopefully higher accuracy.

Autek Research RF Analyst

Make sure that the external power supply rr-1 very low ripple and noise. This is true for all three analyzers. We won’t have arbitrary control over our complex impedance values, but we can at least generate values that auteek have some confidence in. You could even connect the RF-1 to the base of your short antenna, switch over to the L mode. The added inductance should lower the capacitive reactance, which increases the pf value.

rff-1 The second formula EQ. New to Ham Radio? I also terminated the line with a atuek Ohm load and verified that the SWR was 1. This approach is complicated by the difficulty of obtaining accurate reference inductors and capacitors.

Given that this is a field unit, that would likely see more physical abuse and temperature fluctuations than a bench tool, the inability to recalibrate the unit without full disassembly is a serious design flaw.


Autek Research RF-1 RF Analyst

They may be used to determine any small errors in your individual meter, which may be noted and corrected for if desired. The unit was acting unstable, so I changed the battery. There are many other excellent books covering specific topics listed in Ref. In all other data displays, the reactance or phase angle is always shown as an unsigned rt-1.

A common problem is trying to measure the impedance of a meter vertical when you live a few miles away from an AM broadcast station. Once I have these measurements, I measure auetk same components with an analyzer, and determine a simple scaling factor between the two units. I move the test leads from the analyzer to the bridge before I make its measurements so that any lead inductance is folded into the scaling factor. The buttons sometimes don’t function, the knobs have worked their way loose.

Parts are most accurately tested by connecting directly to the coax connector. Turn this to make the LCD brighter or dimmer.

I did my best to supply the correct loss data to TLA, but this is based upon looking at typical loss curves, and selecting values. By itself, the hard-to-read display is a sign of trouble. I recorded all of the information that each meter provided, placing the data into a Microsoft Excel spreadsheet. I liked it size, weight and its function. Something a little strange happened around zero reactance again.

The measured frequency where this cable is a half wavelength was approximately These are completely enclosed termination resistors with an integrated BNC connector. Most of the errors in my data appear in regions of large value swings. Classifieds Detail

Is something wrong with the meter? It is my belief and understanding that these analyzers measure reactance, without directly knowing the type of reactance, and then convert that into units of capacitance of inductance depending upon frequency and the readout capacitance or inductance selected by the user. Use the smallest C that shows a measurable Z change. Their actual measured values are shown in the table. All of the wutek values will repeat every half wavelength.


On this web page, I claim in several places that these analyzers do not report the sign of the reactance. They were not suited for making adjustments out at the antenna.

Excellent unit, great for field day and portable operation. Put the unit back together and checked the calibration uatek again – SWR was wutek.

The data was transferred over a serial line from the CIA-HF to the computer, and displayed with my viewing software. The following three subsection graphs compare each analyzer with the computed results from the Lowband software. There are some differences. The unit, bought at a hamfest and clearly not much used, worked for a week or two of backyard measurements. No solder at all. The displayed values never seem to settle down on large- value readings, for example large Z or C.

This will reduce the sensitivity to test fixture errors. The initial use of the portable antenna analyzer was to measure SWR.

Reactance is either inductive like a coil.

The screw is also “ground. When I listen to the unit on my radio, it has a raspy tone.